InCAP 2019

2nd Indian Conference on Antennas & Propagation (InCAP2019)
December 19-22, 2019 | Ahmedabad, India

Last date for Student Travel Grant Application is October 31, 2019

Notification of Acceptance : September 14, 2019

Early Bird Registration : October 31, 2019

Last Date for Registration : Dec 10, 2019

Congratulations! 2018 IEEE Indian Conference on Antennas and Propogation (InCAP) has been posted to the IEEE Xplore digital library effective 2019-07-25

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Dr. Ameesh Pandya

Title: Antennas in the design of an end-to-end system – a bottleneck or an opportunity?

ABSTRACT: Whether it’s a design of communication system or radar, it is prudent for a system architect to take into account mission, requirements and technological capabilities. Every sub-system, component, channel characteristics and operational environment plays a critical role which makes the design that much more exciting and challenging. One of such key sub-system is the antenna which is the interface to an “external world”. So does this make it a bottleneck in the design? Or an opportunity to enhance the system’s capabilities? This talk focuses on the criticality of an antenna in the design of a system and the role of an antenna engineer in architecting a system. We shall revisit the world of antenna from a System Architect’s perspective and initial design challenges. Speaker will also share his personal experience as a Program Manager and Principal Investigator in working with different entities involved in developing and designing an operational system such as impacts of constantly changing requirements before SRR.

DR. AMEESH PANDYA: Has more than 17 years of experience with 15+ years working in Aerospace industry. He has vast experience with space, air and terrestrial communications. Currently Dr. Pandya serves as a Program Manager and Principal Investigator for the next generation technology on protected communications. He is also a Capture Manager responsible for new business and technology development. Previously, Dr. Pandya has been IPT Lead responsible for RF Units and Antenna Sub-systems, and Chief Network Engineer on SATCOM Program. In addition, he is also a visiting lecturer at University of California Los Angeles (UCLA). Dr. Pandya has Ph.D. in Electrical Engineering from UCLA and has various publications and pending patents. He is also a sports and music lover with representation of Gujarat State at National Level and Visharad degree in Music (Tabla).

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Prof. Prabhakar H. Pathak Professor Emeritus, The Ohio State University,
ECE Dept., Columbus, Ohio, USA Adjunct Professor,
University of South Florida, Tampa,
Florida, USA
pathakph@gmail.com

Title: Beam Techniques to Rapidly Analyze/Synthesize Large Reflector Antennas for Satellite Communication Applications

ABSTRACT: It is known that a point source placed in complex space, i.e., a complex source, generates a wave which exhibits a focused, or beam like behavior with an amplitude decay transverse to its propagation axis [1,2,3]. Depending on how deeply into complex space the source is placed dictates whether the beam is strongly or weakly focused. Such a behavior exists for both, scalar and electromagnetic (EM) waves. A complex source beam (CSB), generated by a complex point source, is an exact solution of the scalar wave equation; likewise, in the EM case, it is an exact solution of Maxwell's equations. In its paraxial region, the CSB behaves like a Gaussian beam (GB) which is a paraxial approximation of the wave equation and inherently contains a windowing behavior in its spatial distribution. The above important properties of the CSBs can be exploited for their use as efficient basis functions to represent relatively arbitrary EM fields. Here, field expansions in terms of the CSBs as the basis functions are demonstrated to rapidly analyze/synthesize large reflector antenna systems commonly used for satellite communications applications. The radiation from the feed which illuminates the reflector is expanded in a set of well focused CSBs, where the feed radiation is assumed known. Such a procedure to obtain a convergent CSB expansion has been described in [4,5]. The CSBs are launched radially out from the feed in the present application. Each CSB hits the reflector from where it is reflected by the surface and diffracted by the edge. The reflected and diffracted contributions from each beam in the expansion are then summed at the field point to obtain the total field of the reflector antenna. The complex points of reflection and diffraction are found via an analytic continuation of real ray reflection and diffraction paths. The reflected beam is found by an analytic continuation of the geometrical optics (GO) reflection for real sources. The diffraction of CSBs by the reflector edges is found by an analytic continuation of the conventional ray based uniform geometrical theory of diffraction (UTD) for edges [6]; a justification for this procedure is provided in [7]. Details of the latter diffraction calculations are described via a novel uniform theory of diffraction (UTD) developed for beams (or UTDB) in the case of edged bodies [8]. Examples of radiation patterns of reflector antennas obtained via the UTDB approach are presented for single beams and also for realistic feed type illumination which involve a beam summation. Applications involving a single feed and an array feed are discussed. The UTDB analysis of a single feed and shaped reflector is demonstrated for a CONUS beam. It is shown that a synthesis of a shaped reflector based on standard physical optics (PO) based codes (which integrate on the PO currents induced over an electrically large reflector surface by the feed) typically require a handful of days to run. In sharp contrast, a UTDB based code can yield an answer for the same problem in only a handful of hours. Additionally, PO does not accurately predict cross polarization effects, whereas UTDB is more accurate. Also, the beam technique avoids any problems at ray caustics which may occur in the reflector main beam direction when using conventional ray based UTD for analyzing reflectors. It may be remarked that a PO based UTD for GBs was used previously in a successful manner for analyzing reflector antennas [9]; on the other hand, the present paper deals with a refinement to [9] since it employs the new and improved solution as described in the UTDB development utilizing CSBs [8]. It may be mentioned in the passing that, due to their versatility, CSB expansions have also been used in dealing with other applications to antennas [10,11].
[1] J. B. Keller and W. Streifer, "Complex Rays with an Application to Gaussian Beam," J. Opt. Soc. Amer., Vol. 61, pp. 40 - 43, 1971
[2] G.A. Deschamps, "Gaussian Beam as a bundle of Complex Rays," Electron. Lett., Vol. 7, pp. 684 -685, 1971
[3] L. B. Felsen, "Complex Source Point Solution of the Field Equations and their Relation to the Propagation and Scattering of Gaussian Beams," Symposia Mathematica, Vol. 18, pp. 39 - 56, 1976
[4] M. Katsav and E. Heyman, "A Beam Summation Representation for 3-D Radiation from a Line Source Distribution," IEEE Trans. AP-56, No. 2, pp. 602 - 605, Feb. 2008
[5] K. Tap, P. H. Pathak and R. J. Burkholder, "Exact Complex Source Point Beam Expansions for Electromagnetic Fields," IEEE Trans. AP-59, No. 9, pp. 3379 - 3390, Sept. 2011
[6] R. G. Kouyoumjian and P. H. Pathak, "A Uniform Geometrical Theory of Diffraction by an Edge in a Perfectly Conducting Surface," Proc. IEEE, Vol. 62, pp. 1448 - 1461, 1974
[7] H-T. Chou, P. H. Pathak and Y. Kim and G. Manara, "On Two Alternative Uniformly Asymptotic Procedures for Analyzing the High Frequency Diffraction of a Complex Source Beam by a Straight Wedge," IEEE Trans. AP-66, No. 2, 2018
[8] P.H. Pathak, H-T. Chou and Y. Kim, UTDB paper currently in preparation
[9] H-T. Chou, P. H. Pathak and R. J. Burkholder, "Novel Gaussian Beam Method for the Rapid Analysis of Large Reflector Antennas," IEEE Trans. AP-49, No. 6, pp. 880 - 893, 2001
[10] K. Tap, P. H. Pathak and R. J. Burkholder, "Complex Source Beam - Moment Method Procedure for Accelerating Numerical Integral Equation Solutions of Radiation and Scattering Problems," IEEE Trans. AP-62, No. 4, pp. 2052 - 2062, 2014
[11] H-T. Chou, P. H. Pathak, S-C. Tuan and R. J. Burkholder," A Novel Far-Field Transformation via Complex Source Beams for Antenna Near Field Measurements on Arbitrary Surfaces," IEEE Trans. AP-65, No. 12, pp. 7266 - 7279, 2017

PROF. PRABHAKAR H PATHAK: Received his Ph.D. (1973) in Electrical Engineering from the Ohio State University (OSU). Currently he is Professor Emeritus at OSU, and Adjunct Professor at the Univ. of South Florida. Prof. Pathak is regarded as a codeveloper of the uniform geometrical theory of diffraction (UTD). His research interests continue to be in the development of new UTD ray solutions in both the frequency and time domains, as well as in the development of fast beam and hybrid (ray and numerical) methods for analyzing electrically large electromagnetic (EM) antenna and scattering problems, including reflector systems and conformal phased arrays. His work includes the development of analytical tools for predicting EM radiation and mutual coupling associated with antennas/arrays on large airborne/spaceborne platforms. He is also working on novel methods related to near field measurements of far zone antenna patterns. Prof. Pathak has been presenting short courses and invited talks at conferences and workshops both in the US and abroad. He has authored/coauthored over hundred journal and conference papers, as well as contributed chapters to seven books. Prior to 1993, he served two terms as an associated editor for Trans AP. He was appointed AP-S distinguished lecturer during 1991-1993, and was later appointed as chair of the distinguished lecturer program for the AP-S during 1995-2005. He was an AP-S AdCom member in 2010. He received the 1996 Schelkunoff best paper award from AP-S; the ISAP 2009 best paper award, the George Sinclair award (1996) from the OSU ElectroScience Laboratory, and the Third Millenium medal from AP-S in 2000. Prof. Pathak received the AP-S distinguished achievement award in 2013. He is an Life Fellow and a member of URSI commission B.

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Dr. Clency Lee-Yow

Title: Antenna Design, Manufacture, and Test for Satellite Applications in New Space

ABSTRACT: Over the past few years, market conditions have drastically changed for satellite manufacturers and their suppliers. Demand for large geostationary satellites is down significantly while the opposite is true for smaller low-cost satellites and large constellations. Companies like CMi has had to make significant changes and adapt to survive in this new environment. This presentation provides an overview of some of the changes CMi has made to its antenna design, manufacturing, and test methodology for satellite applications. Reducing cost and schedule for these antennas is paramount in this new market environment while ensuring high RF performances, low risks for passive inter-modulation products, ability to handle high power, thermal stability, and structural integrity. Antennas to be addressed includes reflector antennas, feeds for reflector antennas, feed arrays, and array antennas.

DR. CLENCY LEE-YOW: Graduated from Queen Mary College in London, UK with a B.Sc. and a Ph.D. in Electrical Engineering. He spent one year with the university as a research assistant before joining Com Dev Internation in Cambridge, Ontario, Canada where he worked as a senior engineer designing a variety of reflector antenna feeds for satellite communications. In 1994, he joined Custom Microwave Inc. (CMI) and took over as VP of operations. He became President of CMI in 1999 and has since transformed the company into a major supplier of high-performance reflector antenna feeds for satellit communications. Since that time, CMI has supplied feeds fr more than 230 satellites

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Prof. Sungtek Kahng Dept. of Information & Telecommunication Engineering, Incheon National University, Korea, s-kahng@incheon.ac.kr, phone : +82-32-835-8288

Title: The Positioning of Metamaterials and Metasurfaces in Antenna Systems for 5G Mobile Communication

ABSTRACT: Almost every single moment nowadays, we hear sales pitches of 5G mobile communication services and products. The commercials keep trying to convince us that we cannot live without 5G mobile phones. Seriously? Not much time has passed since we bought LTE-A phones, and is it necessary to desert healthy 4G phones and get devices of the New Radio era? What kinds of perks will we get with 5G phones? They are higher data-transmission rate, tremendous connectivity, low latency or what not. What makes difference in handset devices from 4G to 5G to attain the benefits? 5G mobile communication is symbolized with millimeter-wave circuits and antennas. This aims at beamforming and an increased speed of streaming services. Actually, the millimeter-wave antenna is yet to come, and sub-6 GHz is available for fast transceiving video signals using carrier aggregation. As for hyper connectivity, MIMO and IoT are mentioned. The capacity of the MIMO ought to be much greater than LTE-A wireless link equipment by enabling a densely populated base-station antenna. Driverless cars are being tested and evolved as a feature of the 5G times, which relies on high speed data-transmission shorter than 10 ms. Antenna design and development technologies up to the smart phone age can iron out the achievement of the aforementioned objectives? In this keynote talk, the possibility and latest progress of combining metamaterials with antenna systems for 5G mobile communication is tapped into as technological jumps. Not only CRLH transmission-lines but also metasurfaces are brought to your attention to enhance the performances of antennas as part of the 5G equipment. Metamaterial components can make a 5G beamforming antenna small in size and/or less power-consuming. Metasurfaces enable basic antennas to have increased gains. Metamaterial MIMO antennas can increase the density and diversity gain for a limited space. There are more to come. It is meaningful and of value to deal with hybridization between the conventional antenna design methods and well-versed metamaterial technologies to reach the multiple goals of cost-saving and efficiency-maximizing in 5G wireless system development.

PROF. SUNGTEK KAHNG Received his Ph.D. degree in electronics engineering and communication engineering from Hanyang University, Korea in 2000, with a specialty in radio science and engineering. From 2000 to early 2004, he worked for the Electronics and Telecommunication Research Institute on numerical electromagnetic characterization and developed RF passive components/antenna feed assemblies for satellites. In March 2004, he joined the Department of Information and Telecommunication Engineering at the Incheon National University where he has continued research on analysis and advanced design methods of microwave components and antennas, including metamaterial technologies, MIMO communication, 5G beamforming antennas and wireless power transfer. He is the Antenna and Microwave area evaluator of Korean Satellite Development Programs invited by NRF, while having worked as a consulting professor for Radio Research Agency, Samsung Electronics, Acetechnology, Amotech, Innertron and serving as the general chair for APCAP 2019 as well as general secretary of ISAP 2011 and APEMC 2011 for KIEES, and head of MTT/AP Technical Group of Korean Institute of Communication and Information Sciences.

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Dr. K.P. Ray Defence Institute of Advanced Technology (DIAT) Ministry of Defence, Govt. Of India Girinagar, Pune- 411 025

Title: Printed Ultra Wideband Antennas

ABSTRACT: There are many applications of wireless communication systems, which require an antenna element with very wide bandwidth. For example, Ultra Wide Band (UWB) wireless system, which requires ultra-wide bandwidth from 3.1 GHz to 10.6 GHz for very high-data-rate and short-range wireless communication, coding for security and low probability of interception, rejection of multi path effect, modern radar systems, etc.

Multi resonant planar and printed monopole antennas are suited for broadband and UWB wireless systems because of their wide impedance bandwidth and nearly omni-directional radiation pattern. Planar radiating monopole antenna (PRMA) yields large bandwidth. In this structure only the radiating patch is planar and hence the name PRMA. Several configurations of PRMA have been reported, some of these reported configurations have bandwidth in excess of that required for UWB applications. The PRMA configurations are being fast replaced by their printed counterpart for various applications, as they are generally mounted on large ground plane, which are perpendicular to the plane of monopole (which makes them three dimensional structures). Also, the large size ground plane, similar to the case of conventional monopole antenna, limits the radiation pattern to only half hemisphere. On the other hand, printed monopole antennas are truly planar and have radiation patterns similar to that of a dipole antenna. These antennas are referred to as Printed or Planar Monopole Antenna as PMA. These monopoles are suitable for integration with other components on printed circuit board, are compact on dielectric substrate, are without backing ground plane and are very easy to fabricate. Printed antennas, commonly fabricated on FR4 substrate, are very efficient and cost effective, which is ideally suited for UWB technology based low cost systems. PRMA and PMA, both these two configurations will be addressed to distinctively and design methodologies of both these antennas will be covered in the lecture.

Bio: Dr. K. P. Ray completed M. Tech in Microwave Electronics from University of Delhi and PhD from Department of Electrical Engineering IIT, Bombay. Presently he is a Professor, Dean (Research) and Head of the Dept of Electronics Engineering& Computer Science, Defence Institute of Advanced Technology (DIAT), DRDO, Pune. Prior to joining DIAT (DRDO)he was the Programme Director of SAMEER (MeitY) Mumbai, wherein he joined SAMEER (TIFR) in 1985 and worked for over 31 years in the areas of RF and microwave systems/components and developed expertise in the design of antenna elements/arrays and high-power RF/microwave sources for RADAR, scientific and industrial applications. He has successfully executed over 48 projects sponsored by various Govt. agencies (DRDO/MOD, ISRO/DOS, DAE, DST/DSIR/TIFAC, Meity, DBT, IMD, BHEL, etc.) and many industries in the capacity of main designer, a chief investigator and a project manager. He was a guest/invited//adjunct faculty in Electrical Engineering Dept at IIT, Bombay, Goa Engineering College, University of Mumbai and CEERI (CSIR) Pilani for post graduate courses. He has guided 8 Ph D students and evaluated more than 25 Ph D Thesis. He has co-authored a book with Prof G. Kumar for Artech House, USA and published over 370 research papers in international/national journals and conference proceedings. He holds 3 patents, earned 3 Transfer of Technology (ToT) and filed three patents. He has been in advisory capacity for many engineering colleges, Polytechnic, international/national conferences, chaired many sessions and delivered more than 100 invited talks, which also includes “First Abdul Kalam Memorial Lecture” at Interim Test Range (ITR), DRDO, Chandipur 2018 and “Ram Lal Wadhwa Lectures 2018. He is a member of many national level scientific committees of various ministries and departments. He is an associate editor of International Journal on RF and Microwave Computer-Aided Engineering, John Wiley, and a reviewer of IEEE TAP, AWPS, IEEE Access, Electronics Letter, IET (Formerly IEE, UK), International Journal of Antennas and Propagation (USA), PIERS (USA), International Journal of electronics (USA), Journal of Electromagnetic Waves and Applications (USA), International Journal of Microwave and Optical Technology (IJMOT) USA, International Journal of Microwave Science and Technology Hindwai, AEU Elsevier, SADHNA Springer, IETE (India) and many international/ national conferences/symposium. He is a fellow of IETE, a senior member of IEEE (USA), and life member of Instrument society of India and Engineers of EMI/EMC society of India. He received many awards including IETE-Ram Lal Wadhwa Award 2018, IETE-Ranjna Pal Memorial Award 2014 and several research paper awards.

prof. sim
Prof. Desmond Sim Professor, Department of Electrical Engineering, Feng Chia University (FCU), Taichung, Taiwan

1: Recent development in antenna array designs for future 5g smartphone

ABSTRACT: Due to the fast development in the 5G communication system, new smartphone designs that can operate in the 5G Frequency Range 1 (FR1) and Frequency Range 2 (FR2), including Sub-6GHz bands n77/n78/n79 and mmWave bands n257/258/n260/n261, respectively, are becoming increasingly important to the 5G smartphone industry. In this invited talk, I will give an overview of recent efforts in designing 5G antenna array for smartphone applications and the various techniques to yield compact size and good isolation between adjacent arrays elements. Besides Single-band MIMO antenna array, Multi-band and Wideband MIMO antenna array designs that can satisfy the entire New Radio (NR) FR1 bands operating in the n77 (3300-4200 MHz)/n78(3300-3800 MHz)/n79 (4400-5000 MHz) are also introduced in this talk. Finally, I will include a very challenging insight on how to integrate the 4G LTE antennas, 5G Sub-6GHz antennas and 5G mmWave antennas into a compact size smartphone.

BIO: Chow-Yen-Desmond Sim (M’07–SM’13) joined the Department of Electrical Engineering, Feng Chia University (FCU), Taichung, Taiwan, as an Associate Professor, where he became a Full Professor in 2012 and as a Distinguish Professor in 2017. He is the founding Director of the Antennas and Microwave Circuits Innovation Research Center in Feng Chia University in 2016, and he has served in the research center until July 2019. He is now serving as the Head of Department of Electrical Engineering in Feng Chia University. He has authored or coauthored over 130 SCI papers. His current research interests include antenna design, VHF/UHF tropospheric propagation, and RFID applications. He is a Fellow of the Institute of Engineering and Technology (FIET), a Senior Member of the IEEE Antennas and Propagation Society, and a Life Member of the IAET. He has served as the Chapter Chair of the IEEE AP-Society, Taipei Chapter (from 01/2016 to 12/2017), and he is the founding Chapter Chair of the IEEE Council of RFID, Taipei Chapter (from 10/2017). He is now serving as the Associate Editor of IEEE Antennas and Wireless Propagation Letters, IEEE Access, IEEE Journal of RFID and (Wiley) International Journal of RF and Microwave Computer-Aided Engineering. Since October 2016, he has been serving as the technical consultant of SAG (Securitag Assembly Group, one of the largest RFID tag manufacturers in Taiwan), and he also serves as the consultant of Avary (the largest PCB manufacturer in mainland China) since August 2018. He was the recipient of the IEEE Antennas and Propagation Society Outstanding Reviewer Award (IEEE Transaction Antennas and Propagation) for six consecutive years between 2014 and 2019. He has also received the Outstanding Associate Editor Award from the IEEE Antennas Wireless and Propagation Letters in July 2018.

prof. rahardjo
Prof. Eko Rahardjo Universitas Indonesia

2: Study on dielectric lens to increase radiation perfor-mances of a terahertz planar antenna

ABSTRACT: Upcoming Terahertz (THz) technologies are facing challenges that electromagnetic waves of that spectrum reaching over a reasonable distance and being received . This issue comes from its much lower wavelength than the existing lower radio frequencies and impact of high atmospheric attenuation.

Therefore, the source of a THz wave should provide optimum radiation performances, especially gain and narrow beam pattern. These requirements are critical to tackling the high potentials power losses when THz waves are propagating in a free-spaces medium. The transition frequency spectrum allows its possibility to approach its engineering design from the two neighboring technology domains, which are radio waves and optics. A quasi-optical technique can also potentials to be applied for obtaining a reasonable THz waves source. We have been studying bowtie planar-type antenna design to perform high radiation by taking advantages of a hemispherical dielectric lens. The use of the dielectric lens can represent a semi-infinite medium. In that condition, an antenna will emit most radiated waves into the higher dielectric constant medium. After the waves propagating in the dielectric medium inside the lens, they pass through the hemispherical boundary between the dielectric medium and free-space.

The boundary condition of the lens antenna hemispherical surface has a purpose of collimating waves come from the antenna wave source. This purpose is by taking advantages of waves refraction principles. Some investigations should be conducted to support this technique. Design a THz antenna should perform radiation characteristics matching with the lens antenna to obtain collimated waves in the free space. Some methods are also necessary to reduce reflection on the boundary that can reduce radiation efficiencies and gain. Size considerations of the antenna and lens should be considered to provide a reasonable radiation performance and sizes suitable for THz systems applications.

BIO: Prof. Eko Tjipto Rahardjo received the PhD. degree from the Saitama University, Urawa, Japan in 1996, in Electrical Engineering. He joined to the Department of Electrical Engineering Universitas Indonesia since 1982 as a teaching assistant. Then since 2005 he has been appointed as Professor in Electrical Engineering. His research interests include antenna engineering, wave propagation, microwave circuits and communication system, and telecommunication system regulations. He published and presented more than a hundred research papers both national and international journals and symposiums. He has also presented a number of keynotes and invited speeches at various national and international seminars.

Prof. Rahardjo is member of IEEE Antenna and Propagation Society (AP-S) and IEEE Microwave Theory and Technique Society (MTT-S). He was the founder of IEEE Joint Chapter MTT-S/AP-S Indonesia. He has served as Chair of IEEE Joint Chapter MTT-S/AP-S, IEEE Indonesia Section in 2009 – 2010 and 2014 - 2015. He is also a member of International Steering Committee (ISC) of Asia Pacific Microwave Conference (APMC) since 2010, General Chairman of Indonesia Malaysia Microwave and Antenna Conference (IMMAC) 2010 held in Jakarta, General Chairman of Indonesia-Japan Joint Scientific Symposium (IJJSS) 2010 held in Bali, General co-Chairman of Indonesia-Japan Joint Scientific Symposium (IJJSS) 2012 held in Chiba, Japan, a member of International Advisory Board of International Symposium on Antenna and Propagation (ISAP) since 2012. He is also General Chair of 1st Indonesia-Japan on Antenna and Wireless Technology (IJAWT) held in Jakarta in 2017 and General Chair of 2019 IEEE CAMA held in Bali.

Prof Parimi
Prof. Patanjali Parimi Advanced Wireless Systems Research Center, State University of New York at Oswego, New York, USA

3. Inverse reflection symmetry odd phase aperture excitation for nondiffracting and asymmetric side lobe beam forming arrays

ABSTRACT: A generalized approach for beam forming arrays with electric fields that are solutions to two types of even ordered linear differential equations - second order differential (SOD) equations of the type 𝝍(𝟐)+𝒙𝟐𝒏−𝟏𝝍=𝟎 and higher even ordered differential (HEOD) equations 𝝍(𝟐𝒏)−𝒙𝝍=𝟎, where 𝒏 is an integer - has been developed. The fields represented by the solutions of these two types of generalizations propagate without diffraction within a specific range, self-accelerate, and result in asymmetric side lobes. In both the cases, the nondiffracting beams are generated over an appreciable range of a few thousand wavelengths, which translates to hundreds of meters at mm-wave frequencies. Based on the new mathematical approach for arrays presented here, near field nondiffracting and far field beam forming arrays are produced using aperture excitations that belong to a family of odd functions characterized by odd (cubic, quantic, heptic, …) inverse reflection symmetry phase distribution of the form (x2n+1+y2n+1)/2n+1 followed by a Fourier lenses. These arrays perform more efficiently than conventional phased arrays with better than 1/r power attenuation in the nondiffracting range. The mainlobe and the dominant sidelobes are contained in one quadrant of the azimuthal plane, whereas the sidelobes in the remaining three quadrants are reduced significantly (by 9 dB at least, for the considered array size). Such asymmetrical radiation patterns are highly applicable in mitigating side lobe interference and ground clutter for radars, and the nondiffracting beams with low power degradation lead to highly efficient wireless communications over long distances.

BIO: Prof. Parimi has been with the State University of New York at Oswego as a Director of Advanced Wireless Systems Research Center since 2013 teaching and conducting research in wireless science, engineering and technology. Prior to that he served as Director of Lambda4D, senior Director of Newlans, Manager Advanced Technology of SI2 Technologies and Associate Research Professor of Northeastern university. Parimi’s primary research interests include wireless communication systems and radar hardware design and development, metamaterials, photonic crystals, and biomedical sensors. He is author of 80+ research publications, 6 patents, and has given numerous invited talks at various research meetings, companies, universities, and DoD agencies. He won as a Principal Investigator more than 25 DARPA, NSF, SBIR, STTR and BAA R&D Awards. He received President’s Aspiration Award for excellence on the work while at Northeastern University. Parimi earned his Ph.D. in 1997, an MS in 1990 both from the University of Hyderabad, India. He received University Grants Commission Fellowship during his Ph.D (1991-’97) and Andhra Pradesh state merit scholarship for his undergraduate education in BS (1985-’88).

Prof Chatterjee
Prof. Deb Chatterjee University of Missouri at Kansas City (UKMC), KC, MO 64110, USA

4. A review of techniques for evaluation of sommerfeld integrals with applications to multiscale electromagnetic wave propagation

ABSTRACT: Rigorous calculation of electromagnetic wave fields in various multilayer topologies involve the appropriate layered media Green’s functions, which in turn contain Sommerfeld integrals. Even for simple topologies such as a single-layer lossy (or lossless) dielectric backed by a perfectly conducting ground plane, modeling of radiation from microstrip patch antennas, or calculation of crosstalk between high speed VLSI signal interconnects, estimation of undesired r.f. coupling to signal lines from external sources, all require the knowledge of appropriate full-wave analysis. The multiscale nature of such a class of problems becomes evident in the case of source excitations having a wide spectral content - such as ultrawideband patch antennas or high speed, ultrashort signal pulses along signal lines.

Sommerfeld integrals that have been encountered in various problems over more than a century still pose computational difficulties because of the nature of its integrand. Fundamentally, these are inverse Fourier transforms that contain the Bessel function,〖 J〗_(n=0,1,2) (ρξ), an exponential term e^(-jκ|z-z^' | ) in addition to another term that collectively describes the effects of the dielectric backed PEC - generically known as the “slab function” F(ξ,d). For microstrip patch antenna arrays, the lateral electrical separation kρ→∞ and z=z^', for calculating mutual coupling between array elements. In case of crosstalk between signal interconnects, that are densely laid out in a small area, one notes that kρ→0. These two situations for a fixed lateral separation can arise in wideband signal spectra, which subsequently can result in using large and small arguments of the Bessel function, respectively. Furthermore, for situations involving mutual coupling and crosstalk calculations, the convergence of the integrand is severely deteriorated because the exponential term vanishes as z≅z^'. This happens when sources are located on the interface. The preceding discussion suggests that in the case of multiscale phenomena, Sommerfeld integrals, at the low and high frequency ends of the signal spectrum could exhibit different types of convergence behaviors that would suggest using different types of algorithms for its numerical evaluation.

The slab function F(ξ,d) contains TE, TM surface and leaky wave poles of the Sommerfeld integrand. The number of these poles, and hence their corresponding residue contributions, increases with electrical thickness d/λ. Determination of the location of these poles require robust root-finding algorithms and is thus a computational bottleneck for all full-wave EM algorithms. This observation, in addition to the preceding convergence issues described above, globally captures the formidable numerical difficulties in evaluation of Sommerfeld integrals for multiscale electromagnetic problems involving multilayer media.

There exists several algorithms for evaluating Sommerfeld integrals, with their attendant limitations. However, examining the various approaches it appears that a significant improvement in the evaluation of Sommerfeld integrals for multiscale, multilayer problems would be effected if: (a) pole contributions and (b) Bessel function approximations were obviated. In the presentation recent methods for evaluating Sommerfeld integrals complying with the stipulations (a) and (b) will be highlighted with applications to multilayer topologies. Numerical comparisons against existing methods and commercial EM solvers will be included to demonstrate the more global nature of this algorithm. Possible extensions to the general multilayer case will be discussed.

Selected References [1] W. C. Chew and L. J. Jiang, “Overview of the Large Scale Computing: The Past, the Present and the Future,” Proceedings of the IEEE, vol. 101, no. 2, pp. 227-241, February 2013
[2] K. A. Michalski and J. R. Mosig, “Efficient Computation of Sommerfeld Integral Tails - Methods and Algorithms,” Journal of Electromagnetic Waves and Applications, vol. 30, no. 3, pp. 281-317, 2016
[3] S. Barkeshli, P. H. Pathak and M. Marin, “An Asymptotic, Closed-Form, Microstrip Surface Green’s Function for the Efficient Moment-Method Analysis of Mutual Coupling in Microstrip Antennas,” IEEE Transactions on Antennas and Propagation, vol. 38, no. 9, pp. 1374-1383, September 1990
[4] D. Chatterjee, S. M. Rao and M. S. Kluskens, “Improved Evaluation of Sommerfeld Integrals for Microstrip Antenna Problems,” Proc. Intl. Symp. Electromag. Theory, (URSI Commission B), pp. 981-984, Hiroshima, Japan, May 2013

BIO: Deb Chatterjee is an associate professor with the Computer Science and Electrical Engineering Department at the University of Missouri at Kansas City (UMKC), USA. He obtained his B.Tech, M.Tech, M.A.Sc and PhD degrees in 1982, 1984, 1992 and 1998 respectively. Dr. Chatterjee teaches courses in electromagnetic theory and antennas. His research interests are asymptotic high-frequency techniques, Green’s functions, phased arrays, electrically small, pulsed and ultrawideband antennas, characteristic mode theory, crosstalk modeling in high speed VLSI interconnects, biomedical imaging and r.f. propagation. Dr. Chatterjee is a Senior Member of the IEEE and URSI Commission B.

Dr. Prasad
Dr. NNSSRK Prasad Scientist H, Aeronautical Development Agency, Bangalore

5. Airborne antenna technologies for fighter aircrafts: challenges in realization & evaluation

ABSTRACT: There are innumerable challenges in design, development, qualification, certification and flight evaluation of antennas (for systems) on fighter aircrafts. This talk brings about the various issues related to these aspects with reference to combat aircrafts of present and future generations. The technologies available at present and trends in future technologies for these antennas will be discussed and the challenges faced and being faced will be touched upon in this presentation. The requirements of advanced combat aircrafts will be deliberated.

BIO: Dr. Prasad has more than 30 years of Experience in Research, Design and Development and is currently working as Scientist ‘H’ (Outstanding Scientist) in Aeronautical Development Agency (ADA). He joined ADA in 1998 from SAMEER-Mumbai (former group of Tata Institute of Fundamental Research (TIFR)-Mumbai), where he was working since 1986. He received Ph.D. in Communication Engineering from IIT-Bombay in 2003. M.Tech., in Controls and Instrumentation and B.Tech., in Electronics and Communication engineering and from JNTU College of Engineering, Kakinada, (A.P.) in 1987 and 1985 respectively.

Dr. Prasad made key contributions to several prestigious National Projects like MST Radar for atmosphere research of ISRO (NARL), Opto-electronic Integrated Circuits project for Ministry of Information Technology, RF Networking of Indian Light Houses & Radio Beacon projects of Ministry of Surface Transport, Active Seeker project of DRDO etc. during his tenure at SAMEER-Mumbai. Currently he is working on a key national project Tejas- Indian Light Combat Aircraft (LCA) project, its variants for Indian Air Force (IAF) and Indian Navy (IN). He is also working on Medium Weight Fighter (MWF) and Advanced Medium Combat Aircraft and other projects of ADA. He has more than 100 publications in national and international conferences and journals. He is a senior member of IEEE, USA, Fellow of IETE, IE, AeSI, OSI, VEDA, Life Member of ISOI, SEMCEI, ASCI, ISSE and CSI and Member of IET, UK and AOC, USA. He guided independently many under-graduate and post-graduate projects and guided five Ph D candidates. Dr. Prasad was awarded with 'DRDO Scientist of the Year' in 2015.

Dr Chahat
Dr. Nacer Chahat Senior Engineer, NASA/JPL Pasadena, USA

6. Qualification of a highly efficiency flat high gain antenna for the potential Europa Lander

ABSTRACT: An overarching NASA science quest is to find definitive answers to the age-old question of are there life forms elsewhere in the universe. A body within our Solar System that holds promise as a habitat for life is Europa, a moon of Jupiter, which while slightly smaller than Earth's Moon, is host to a vast deep ocean that holds twice as much water as all of the water on Earth. NASA is working on a mission concept to land on Europa but communicating with Earth is a significant challenge for such a lander. If we add a relay orbiter, the cost becomes prohibitive and on the other hand direct-to-Earth (DTE) communications with existing technologies is problematic. This is because the volume and the mass of the required large antenna that seats on the lander become an obstacle due to historical low efficiency of existing designs. And then there is the issue of survival in the intense radiation environment and cryogenic temperatures of Europa.

The Jet Propulsion Laboratory has developed a new antenna enabling the potential Europa lander mission. It demonstrates unprecedented efficiency (>80% at both uplink and downlink frequency bands) and is also capable of handling much higher input power. This results in a significant increase in data rate within an acceptable volume and size for the lander carried antenna. For comparison, the antenna employed on previous landers (such as Curiosity on Mars) demonstrate less than 50% efficiency. Furthermore, they could not survive the environment of Europa because they are made of dielectric. The proposed antenna is flat and is mainly made of metal making it immune to high radiation level and electrostatic discharge. This highly efficient direct-to-earth lander antenna eliminates the need for an orbiter and makes a Europa lander a feasible project.

BIO: Nacer Chahat (S’09–M’12–SM’15) received the Master’s degree in electrical engineering from the Ecole Supérieur d’ingénieurs de Rennes (ESIR), Rennes, France, in 2009; the Master’s degree in telecommunication and the Ph.D. degree in signal processing and telecommunications from the Institute of Electronics and Telecommunications of Rennes (IETR), University of Rennes 1, Rennes, France, in 2009 and 2012, respectively. He is a Senior Antenna/Microwave Engineer with the National Aeronautics and Space Administration (NASA) Jet Propulsion Laboratory (JPL), California Institute of Technology, Pasadena, CA. Since 2013, he has been a Microwave/Antenna Engineer with NASA’s Jet Propulsion Laboratory and he has been Technical sSection Staff and Product Delivery Manager since 2017.

He has authored and coauthored more than 100 technical journal articles and conference papers, has written four book chapters, and also holds several patents. His research interests include deployable antennas for CubeSat and small satellites, spacecraft antennas for telecommunications, RADAR, imaging systems, metasurface antennas and metasurface beam steering antennas. Dr. Chahat was the recipient of the 2011 CST University Publication Award, the 2011 Best Paper Award from the Bioelectromegnetics Society, and the IEEE Antenna and Propagation Society Doctoral Research Award in 2012. He was awarded by Foundation of Rennes 1, Best Ph.D. of University of Rennes. In 2013, he received the Best Ph.D. thesis in France in electrical engineering awarded by club EEA (Enseignants et des chercheurs en Electronique, Electrotechnique et Automatique).

In 2013, he was awarded the Airbus Group Foundation’s Best Thesis Prize in France. In 2015, he received a French Early Career Award for Engineer and Scientist (Prix Bretagne Jeune Chercheur) for his significant scientific contribution in his early career. In 2017, he received the IEEE A. Schelkunoff Transactions Prize Paper Award. In 2017, he also received the prestigious Lew Allen Award for Excellence awarded by NASA’s Jet Propulsion Laboratory / Caltech. In 2018, he was awarded the Future Technology Leader Award by the Engineers’ Council and the NASA Early Career Achievement Award by the United States government and National Aeronautics and Space Administration (NASA).

Dr. sbsharma
Dr. S.B. Sharma Deputy Director (Retd.), Antenna Systems Area, ISRO Outstanding Scientist (ISRO)

7. Antennas for Satellite Communication and Remote Sensing

ABSTRACT: Antenna is the most critical sub-system, be it satellite communication or microwave remote sensing payloads. Antennas have always played major roles since long time in past and continue to be critical subsystems for present and future payloads. The aim of this talk is to present an overview of the antennas developed earlier, present technologies and future trends. The antennas have been further classified broadly into two categories: reflector and planar antennas. Various types of reflectors like symmetric & asymmetric, single & dual, unshaped & shaped and dual-gridded reflectors have been described. Associated horn feeds like dual mode, multimode, corrugated, and conjugate feeds have been described. Under planar antennas direct radiating arrays of microstrip patches, phased arrays, slotted waveguide arrays, and Frequency Selective Surfaces have been included in the presentation.

BIO: Dr. Sharma is a rare blend of fundamental researchers with sound understanding of the advanced electromagnetic modeling and antenna design techniques having 47 years of diversified research and academic experience. He is an innovative hardware engineer and a forward-thinking educationist incorporating contemporary methods of teaching. Being a visionary of extraordinary caliber, he has many milestones to his credit amongst which are; his long and luminous tenure as Outstanding Scientist and Deputy Director, Antenna Systems Area (ASA), Space Applications Center (SAC), ISRO leading and guiding cutting-edge antenna related R & D for Satellite Communication and Microwave Remote Sensing Programs. After superannuation from ISRO his leadership as Vice Chancellor at Indus University was bound to inspire students by incorporating contemporary methods of teaching methods. His boundless stamina for advance R & D has resulted in obtaining 28 national/international patents and publication of more than 170 papers in refereed journals and conferences to his credit.

Dr. Sharma contributed significantly to the design and development of various space borne, air borne and ground station antenna systems for Microwave Remote Sensing and Satellite Communication Programs of ISRO. In particular, he led the team to deliver a variety of antenna systems for INSAT and GSAT series of satellites, multi frequency radiometer, two beam scatterometer, altimeter, radar imaging satellites, and number of slotted waveguide printed array antennas for various remote sensing applications. He conducted fundamental research on surface wave antennas, Short Back Fire (SBF) antennas and Fresnel ring antennas.

He guided the team responsible for design, development, installation and commissioning of large number of telemetry, tracking and tele-command antenna systems for satellite launch vehicles (SLV,ASLV, PSLV),Indian Remote Sensing Satellites (IRS) and communication earth station antenna systems. During his tenure at SAC,44 new technologies were developed at ISRO resulting in the realization of more than 160 indigenous state of the art antenna systems. Eleven technologies have been successfully transferred to various industries for mass production. Concurrently, he was the Project Director for Strategic defence projects like TRINETRA , ASCS, ARIES and ARIES Augmentation; Associate Project Director of Multi Frequency Scanning Microwave Radio-meter (MSMR) payload for Oceansat-I, IRS Ground Station Project for NRSC, Hyderabad and Compact Antenna Test Range (CATR) Planar Near Field Facility at SAC / ISRO, Ahmedabad. He was Honourable Professor at various universities and guided 6 students for their PhD. Currently, as the Technology Head at Entuple Technologies Pvt. Ltd. he is engaged with R & D on state-of- the-art antenna systems for aerospace, naval and ground based strategic applications. He was conferred IETE Baliga Memorial Award,2008, Astronautical Society of India Award,2007, ISRO's Merit Award, Team Excellence Award,2007, Dr. Vikram Sarabhai Research Award in 1989, ISRO's Distinguished Achievement Award in 1976 and University Gold Medal in M.E. at University of Roorkee, 1972. He is a fellow of FNAE, fellow of IETE and fellow of BES, and Senior Member of IEEE.

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