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ABSTRACT
Bandwidth enhancement of reflectarray is being extensively investigated in recent years. In this paper, the design and experimental evaluation of two wideband reflectarray antennas in the X-Ku band (10–15 GHz) are presented. A reflectarray realized using concentric square ring-based elements exhibits a 2.5-dB gain bandwidth of approximately 46.2%, with a peak gain of 25 dB. A reflectarray designed with circular ring-based elements exhibits a 2.5-dB gain bandwidth of approximately 14.5% (and a 1-dB gain-bandwidth of 11%), where the maximum gain is observed to be 27.8 dB. The cross-polarization level is well below −35 dB for both the reflectarrays.
ACKNOWLEDGEMENTS
The substrate measurements reported in Figure 7 were carried out by M. Anjali, Research Scholar, at the Microwave Lab, Department of Physics, IIT Madras. The authors extend their sincere thanks to her and Prof. V. Subramanian, Department of Physics, IIT Madras for the insightful comments.
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Notes on contributors
Lingasamy Veluchamy
V Lingasamy is currently working as technical lead at HCL Technologies on Keysight LTE-CV2X RF conformance testing project. He has worked as a senior research fellow and as junior research Fellow in the ISRO-RESPOND project at SSN College of Engineering, Kalavakkam, India. He has authored and co-authored six journal papers and presented several papers in national and international conferences. He is an active member of IEEE and positioned as an executive member and treasurer of IEEE AP-S Madras Chapter. He is a reviewer of IEEE Antennas and Propagation Letters, IET Microwave Antennas and Propagation, and ACES Journal. His research interests include reflectarray antennas, lens antennas, antenna measurements, horn antennas, printed antennas, and RF testing.
Krishnasamy T. Selvan
Krishnasamy T Selvan received his BE (Honours) degree from AC College of Engineering & Technology, Karaikudi, India in 1987, MS degree from Birla Institute of Technolgy & Science, Pilani, in 1996 and PhD degree from Jadavpur University, Kolkata, India in 2002. He received a post graduate certificate in higher education from the University of Nottingham, UK, in 2007. Selvan has been a professor in the Department of Electronics & Communication Engineering, SSN College of Engineering, India, since June 2012. From early 2005 to mid-2012, he was with the Department of Electrical & Electronic Engineering, University of Nottingham Malaysia Campus. He also held the positions of assistant director of teaching and learning and deputy director of studies. During August-September 2009, he was a visiting scholar at the University of Nottingham, UK. From early 1988 to early 2005, he was with SAMEER – Centre for Electromagnetics, a Government of India's Microwave Research Institution, in Chennai, India. During 1994–1997, he was the principal investigator of a collaborative research programme that SAMEER had with the National Institute of Standards and Technology, USA. Later he was the project manager of successfully completed antenna development projects. From early 1988 to mid-1990, on deputation from SAMEER, he worked at IIT Kanpur, India on a radar clutter measurement project. During February to April 1994, he held an UNDP Fellowship at RFI Industries, Australia. Selvan's professional interests include electromagnetics and antenna theory, design and measurements. He is also keen about electromagnetic education, in particular, and higher education, in general. In these areas, he has authored or coauthored a number of journal papers and conference papers and talks. He is an editor for the online journal FERMAT, and was earlier on the editorial boards of the International Journal of RF and Microwave Computer-Aided Engineering and the International Journal of Antennas and Propagation. He founded the Madras Chapter of IEEE Antennas and Propagation Society in 2013. He has been involved in several major conferences and workshops, both as a speaker and as an organizer. Selvan was a member of the Education Committee of the IEEE Antennas and Propagation Society from 2006 to 2018. He took major lead in proposing, formulating and administering the IEEE AP-S Region 10 Distinguished Speaker programme for promoting EM education. He was also a distinguished speaker for 2015–16 under this programme. On an invitation from IEEE AP-S Taiwan Chapter, he visited National Taiwan University in July 2016 and gave a talk on his EM education-related initiatives in South India. Email: [email protected]
Rajeev Jyoti
Rajeev Jyoti, has outstanding experience of more than 30 years in the design, analysis and development of antennas of microwave payloads required for ISRO Space borne Communication & Remote sensing and Navigational Satellites. He has been at ESTEC, European Space Agency (ESA), The Netherland for 14 months as UN Fellow on antenna & propagation. As deputy director of Microwave Remote Sensing Area of Space Applications Centre, ISRO, Ahmedabad, he has designed, developed and delivered complex microwave payloads related to Scatterometer, Radar Imaging Satellite-2B, Dual frequency SAR and Ka-band radar Altimeter for Chandrayaan-II missions and is leading technology development and advanced research and development programme in sub-millimeter wave/THz payloads, high resolution multi-frequency scatterometers, multifrequency wide swath and high resolution synthetic aperture radars etc. He has published more than 100 technical papers in various conferences and referred journals. He is the inventors of seven new technologies having international patents. He has received ISRO merit and performance excellence award for his notable contribution of satellite payload technology and has also received ISRO team excellence award as team leader several times. Email: [email protected]
Sagi Sravan Kumar
Sravan Kumar Sagi is the head of Satellite Communications Antenna Division, SAC, ISRO, Ahmedabad with additional responsibilities as the deputy director for GSAT-16 antennas and project manager for IRNSS, GISAT, HSP antenna programs. He received BE in electronics and communication engineering from Andhra University (1997), India and ME in Microwave & Radar from University of Roorkee, India (1999). He joined ISRO in 1999. He is working in the field of communication, navigation satellite antennas & ground terminal antennas. His research interests include wide band, multi frequency printed antennas, microstrip reflectarray antennas, high power helical array antennas, shared aperture antennas, frequency selective surfaces and array synthesis techniques. His major contributions in the field of satellite antennas include: aperture helical circular array antenna at L5 & S-bands for IRNSS, dual gridded reflector antenna at C band for GSAT-16, 18 (24% Bandwidth), helix array with square coax. Feed NW for improved EOC Gain, XPI (GSAT-15), phased array antenna at Ku-band for GISAT, common aperture L1, L5, S-band antenna for future IRNSS systems, single DGR antenna RF design for future payloads over normal C-Tx, Rx (3.7–4.2 GHz, 5.9–6.4 GHz) and upper extended C-Tx, Rx bands (4.5–4.8 GHz, 6.7–7 GHz), 8×4 dual polarized multi-layer C-Tx, C-Rx patch array antennas for Antarctica beam (GSAT-17), problem diagnosis & RF design verification of GSAT-17, GSAT-18, RISAT-2A antennas, design of frequency selective sub-reflector antennas at various bands. Email: [email protected]