Active RCS Reduction in Series-fed Dipole Phased Array in Hostile Probing Environment

Authors

  • Adrija Chowdhury Centre for Electromagnetics (CEM),CSIR-National Aerospace Laboratories, Bengaluru-560017, India
  • Raveendrantah U. Nair Centre for Electromagnetics (CEM),CSIR-National Aerospace Laboratories, Bengaluru-560017, India
  • Hema Singh Centre for Electromagnetics (CEM),CSIR-National Aerospace Laboratories, Bengaluru-560017, India

Keywords:

Radar cross section, scattering, phased array, center-fed dipole antenna, active cancellation, modified iimproved LMS algorithm

Abstract

The radar cross section (RCS) of an aerospace platform can be reduced significantly by controlling the scattering from phased arrays mounted over it. This may be achieved by exploiting the capability of active cancellation of probing sources by the array. If the array reduces the RCS towards the hostile probing directions, the platform becomes invariably invisible towards the probing radar source. This concept of active RCS reduction has been used to reduce the array RCS of a series-fed linear dipole array using modified improved LMS algorithm. The array performance in terms of active RCS reduction depends upon the geometrical configuration, number of antenna elements, design parameters of radiating element and feed network, and the signal environment considered. It is observed that the current feeding parameter does not affect much the adapted RCS pattern; instead parameters like characteristic and load impedances, power level of probing sources and efficiency of adaptive algorithm play crucial role in placing deep nulls in RCS pattern towards the respective probing
sources.

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Author Biographies

Adrija Chowdhury, Centre for Electromagnetics (CEM),CSIR-National Aerospace Laboratories, Bengaluru-560017, India

Ms Adrija Chowdhury is currently working as Project Scientist in the Centre for Electromagnetics (CEM) of CSIR-National Aerospace Laboratories, Bangalore. She obtained M.Tech. (Optoelectronics &Optical Communication) in 2015 from Amity School of Engineering & Technology, Amity University, Uttar Pradesh. She obtained her B.Tech. (ECE) degree in 2013 from Uttar Pradesh Technical University. She was awarded Prime Minister Scholarship for excellence in academic field for her  graduation studies. Her research interests include, radar cross section (RCS) based studies, probe suppression in phased arrays,
and active RCS reduction. 

Raveendrantah U. Nair, Centre for Electromagnetics (CEM),CSIR-National Aerospace Laboratories, Bengaluru-560017, India

Dr R.U. Nair is currently Senior Principal Scientist and Head, Centre for Electromagnetics (CEM),
CSIR-National Aerospace Laboratories (CSIRNAL), Bangalore, India.Ha also holds post of Professor of AcSIR. He received the M.Sc (Physics) and the Ph.D in Physics (Microwave Electronics) from the School
of Pure and Applied Physics, Mahatma Gandhi University, Kerala, India, in 1989 and 1997, respectively. During 1992 to 1994, he was a project assistant in the Department of Electronics, Cochin University of Science and Technology (CUSAT), Cochin, Kerala, India. In November 1997, he joined as a lecturer in the Department of Electronics, CUSAT and continued in the same department upto July, 1999. During this period, he participated as a co-researcher in the activities related to international collaborative project for
Ground Penetrating Radar (GPR) between CUSAT and International Research Centre for Telecommunications and Radar (IRCTR), TU Delfts, The Netherlands. Dr R U Nair joined CEM, CSIR-NAL in 1999. Dr R U Nair has authored/co-authored over 200 research publications including peer reviewed journal papers, symposium papers and technical reports. He has co-authored a chapter in a book Sensors Update published by Wiley-VCH, Germany, in 2000. The electromagnetic (EM) material characterization techniques developed for his doctoral work were included in the section Perturbation Theory in RF and Microwave Encyclopedia (Vol. 4) published by John-Wiley & Sons, USA in 2005. Dr R U Nair received the CSIR-NAL Excellence in Research Award (2007-2008) for his contributions to the EM design of variable thickness airborne radomes. His research interests include electromagnetic design and performance analysis of radomes, radar cross section, frequency selective surfaces (for Radomes and RAS), EM material characterization, complex media electromagnetics and microwave measurements. He is a life member of Aeronautical Society of India (AeSI), member of ISAMPE and member of IEEE. Dr R U Nair is also an Associate Professor of the Academy of Scientific and Innovative Research (AcSIR), New Delhi.

Hema Singh, Centre for Electromagnetics (CEM),CSIR-National Aerospace Laboratories, Bengaluru-560017, India

Dr. Hema Singhis working a principal scientist in Centre for Electromagnetics, National Aerospace
Laboratories (CSIR-NAL), Bangalore, India. She also holds post of Associate Professor in CSIR Academy, AcSIR. She received Ph.D. degree in Electronics Engineering from IIT-BHU, Varanasi India in Feb. 2000. For the period 1999-2001, she was Lecturer in Physics at P.G. College, Kashipur, Uttaranchal, India. She was a Lecturer in EEE of Birla Institute of Technology & Science (BITS), Pilani, Rajasthan, India, for the period 2001-2004. She joined CSIR-NAL as Scientist in January 2005.She has been a member of IEEEIndustry Initiative Committee, IEEE, IET, IETE, Indian Society for Advancement of Material and Process Engineering (ISAMPE), and Aeronautical Society of India. Her active areas of research and teaching interests are in the domain of: Computational Electromagnetics (CEM) for Aerospace Applications, RF and Microwaves. More specifically, the topics of the sponsored projects she has contributed in are Radar Cross Section (RCS) studies including Active RCS reduction, EM analysis of propagation in an indoor environment, phased antenna arrays, adaptive array processing, and conformal array. Dr. Singh has authored or coauthored 11 books, 1 book chapter, 7 software copyrights, 235 scientific research papers and technical reports. She has also supervised over 40 graduate projects and postgraduate dissertations.Dr. Hema Singh received Best Woman Scientist Award in NAL, Bangalore for period of 2007-2008 for her contribution in area of phased antenna array, adaptive arrays, and active RCS reduction.

References

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Published

2020-10-22

How to Cite

Adrija Chowdhury, Raveendrantah U. Nair, & Hema Singh. (2020). Active RCS Reduction in Series-fed Dipole Phased Array in Hostile Probing Environment. International Journal of Advances in Microwave Technology, 2(3), 103-109. Retrieved from https://ijamt.com/index.php/ijamt/article/view/52

Issue

Vol. 2 No. 3 (2017): Volume 2, Issue 3 (August 2017)

Section

Rasearch Paper