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Abstract
This paper presents the design of common aperture dual band dual linearly polarized microstrip array antenna, working at L and S-band for airborne synthetic aperture radar (SAR). The antenna has been designed to offer equal beamwidth across the track of aircraft at both bands. The probe fed square annular patch antenna at L-band and electromagnetically coupled stacked patch antenna at S-band have been selected as array elements and distributed in 2 × 6 and 2 × 12 arrays on the same aperture, respectively. The aperture size is 0.35 × 1.2 m. The antenna has been developed and characterized in the compact antenna test field. The achieved 1:2 VSWR bandwidth is 200 MHz at L-band and 400 MHz at S-band. The measured peak gain is 16.3dBi at 1.25 GHz and 19.0dBi at 3.2 GHz. The developed antenna has also resulted in greater than 30dB port-to-port isolation and cross-polarization at both frequencies.
ACKNOWLEDGEMENTS
The authors acknowledge the support and encouragement provided by Director SAC. The authors are also gratified to all MSAD engineers for their help and support.
Additional information
Notes on contributors
B.K. Pandey
Balendu Kumar Pandey was born in 1975 in Haridwar district, Uttar Pradesh, India. He completed BSc in physics from DBS College Dehradun affiliated to HNB Garhwal University in 1995. He completed BE in electronics and communication engineering from Madan Mohan Malviya Government Engineering College affiliated to Deen Dayal Upadhyaya University Gorakhpur in 1999. He obtained ME in electronics and tele-communication engineering from Jadavpur University in 2001. He joined Microwave Sensors Antenna Division in Antenna Systems Group at Space Applications Centre, Ahmedabad as a Scientist/Engineer “SC” in 2001. He is involved in the design and development of antenna systems for space borne, airborne, and ground-based microwave remote sensors. He has contributed significantly to the design and development of antennas for Radar Imaging Satellite and Disaster Management Synthetic Aperture Radar projects. He has been involved in design and development of phased array planar microstrip antenna for RISAT-1, Cosec2 shaped beam antenna for C-band and X-band DMSAR, dual polarized common aperture planar microstrip antenna for SAR payload of Chandrayaan-2 and dual polarized dual band planar antenna for Air-borne SAR. He received ISRO Young Scientist Award-2008 and best research-oriented paper IETE-CDIL Award for Industry-2019. He two patents and published more than 20 papers in journals, national and international conferences.
Pratik Mevada
Pratik Mevada received Bachelor in Technology (BTech) degree in electronic and communication engineering from the Institute of Technology, Nirma University, Ahmedabad, Gujarat, India in 2010 and currently pursuing PhD from Dhirubhai Ambani Institute of Information and Communication Technology, Ghandhinagar, Gujarat, India. From September 2010, he is working as scientist/engineer in Microwave Sensors Antenna Division (MSAD), Antenna Systems Group (ASG) at Space Applications Centre (SAC), Indian Space Research Organization (ISRO), Ahmedabad. His research interests are in the area of multiband multilayer microstrip antennas, array antennas, reconfigurable metasurface antenna, and deployable antennas. Email: [email protected]
S.B. Chakrabarty
S B Chakrabarty obtained his BE (Hons) degree from NIT Silchar (previously REC) in 1988, ME from Jadavpur University in the year 1992 both in electronics and telecommunication engineering and PhD degree in microwave engineering from Indian Institute of Technology, Kharagpur in the year 1996. He served NIT, Silchar as lecturer in the Department of Electronics and Telecommunication Engineering during 1995–1996. He is currently working in Antenna Systems Group, Space Applications Centre, Ahmedabad as head, Microwave Sensors Antenna Division and involved in the development of a variety of state-of-the-art antenna system related to Microwave Remote sensing. He served the German Aerospace Centre (DLR) during 1999–2000 as guest scientist deputed from ISRO. His area of research is computational electromagnetics, microwave and millimeterwave antennas. He has authored and co-authored more than 80 papers published in IEEE transactions on EMC, MTT and IET Journals, International Journal of Electronics, Journal of Electromagnetics, Journal of Electrostatics, Microwave and Optical Technology Letters, etc. in addition to several technical reports at the Space Applications Centre/ISRO. He has also presented a number of papers in international conferences. He received INSA visiting fellowship 1996 and was short-listed for INSA young Scientist award 1997 and received ISRO excellence team awards two times. Email: [email protected]
M.B. Mahajan
Milind Mahajan obtained his BE (Electronics) degree in 1991 from Marathwada University, Aurangabad and MTech degree in microwave engineering from IIT, BHU, Varanasi in 1993. He received PhD degree from DD University, Nadiad in 2015. He started his career in Spacecraft Payload Group of Space Applications Centre, Ahmedabad in 1993. He is currently working as Group Director, Antenna Systems Group. He has worked as guest scientist at German Aerospace Centre (DLR) in 2001. He was the designer of shaped reflectors and dual gridded reflector antennas, high power helix antenna, multiple beam antennas for the various INSAT and GSAT programs. His current areas of interest are contoured beam reflector antennas and digital beam forming based antennas. He held many responsibilities as deputy project director, Comm. Payload Antenna Systems of INSAT-4A/4B/4C, GSAT-7/7A and Advanced Communications Satellite, GSAT-11 projects. He has led the team to develop the antenna systems for navigation satellites, radar imaging satellites and Chandrayaan-2 missions. He is recipient of Space Gold Medal of Astronautical Society of India in 2005, ISRO’s team excellence awards in 2007, 2008, 2015 and 2017. He has more than 50 publications in national/international journals and conferences and 3 national /international patents to his credit. Email: [email protected]