Application of Metallic Strip Gratings for Enhancement of Electromagnetic Performance of A-sandwich Radome

  • Raveendranath U. Nair National Aerospace Laboratories, Bengaluru
  • J. Madhumitha National Aerospace Laboratories, Bengaluru
  • R. M. Jha National Aerospace Laboratories, Bengaluru
Keywords: Radomes, metallic strip gratings, radome performance parameters


Enhancement of the electromagnetic (EM) performance characteristics of A-sandwich radome wall over X-band using metallic strip gratings is presented in this work. Equivalent transmission line method in conjunction with equivalent circuit model (ECM) is used for modeling the A-sandwich radome panel with metallic strip gratings and the computation of radome performance parameters. Metallic strip grating embedded in the mid-plane of the core and those in the skin-core interface are the configurations considered in the present work. For a given thickness of metallic strip grating, its width and pitch are optimized at different angles of incidence such that the new radome wall configuration offers superior EM performance over the entire X-band as compared to the conventional A-sandwich wall. The EM analysis shows that the superior EM performance of A-sandwich with metallic strip gratings makes it suitable for the design of normal incidence and streamlined airborne radomes.

Defence Science Journal, 2013, 63(5), pp.508-514, DOI:

Author Biographies

Raveendranath U. Nair, National Aerospace Laboratories, Bengaluru
Dr Raveendranath U. Nair received his MSc and PhD in Physics (Microwave Electronics) from the School of Pure and applied Physics, Mahatma Gandhi University, Kerala, India, in 1989 and 1997, respectively. Since September 1999 he has been working as Scientist at the Centre for Electromagnetics in CSIR-NAL, Bangalore, India where currently he is a principal scientist. He has authored/co-authored over 100 research publications including journal papers, symposium papers and technical reports. His research interests include computational electromagnetics, EM design, analysis and performance measurements of radomes, metamaterials, frequency selective surfaces, EM material characterization techniques.
J. Madhumitha, National Aerospace Laboratories, Bengaluru
Ms J. Madhumitha obtained the BE (Electronics and Communication) from Anna University, Chennai, in 2005. She is currently working as a Technical Manager in Sterling Electronics at Tiruchirappalli, Tamilnadu, India. She was earlier working as a Project Engineer at the Centre for Electromagnetics, CSIR-National Aerospace Laboratories (CSIR-NAL), Bangalore, India. Her research interests are in Radomes and EM material characterization.
R. M. Jha, National Aerospace Laboratories, Bengaluru
Dr Rakesh Mohan Jha obtained a dual degree in BE (Hons.) EEE and MSc Physics from BITS Pilani (Raj.), in 1982 and PhD from Department of Aerospace Engineering, Indian Institute of Science, Bangalore, in 1989. He is currently a Chief Scientist and Head of Centre for Electromagnetics at CSIR-National Aerospace Laboratories, Bangalore. He is also concurrently Professor and Associate Dean of the Academy of Scientific and Innovative Research, New Delhi. His active areas of research are in the domain of computational electromagnetics for aerospace applications; these include GTD/UTD, 3-D ray tracing and surface modelling, aerospace antennas and radomes, radar cross section (RCS) studies including active RCS reduction, radar absorbing materials and radar absorbing structures, and metamaterials for aerospace applications. He has published more than 400 scientific research papers and technical reports.
How to Cite
Nair, R., Madhumitha, J., & Jha, R. (2013). Application of Metallic Strip Gratings for Enhancement of Electromagnetic Performance of A-sandwich Radome. Defence Science Journal, 63(5), 508-514.
Electronics & Communication Systems