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In-band RCS reduction antennas using an EBG surface

Published online by Cambridge University Press:  16 June 2021

Manivara Kumar Parsha Open the ORCID record for Manivara Kumar Parsha [Opens in a new window] ,
Arnab Nandi Open the ORCID record for Arnab Nandi [Opens in a new window]  and
Banani Basu Open the ORCID record for Banani Basu [Opens in a new window]
Manivara Kumar Parsha
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Silchar, Silchar, Assam, India
Arnab Nandi*
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Silchar, Silchar, Assam, India
Banani Basu
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Silchar, Silchar, Assam, India
*
Author for correspondence: Arnab Nandi, E-mail: arnab@ece.nits.ac.in
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Abstract

The paper has proposed a multilayer, polarization rotation featured, low radar cross-section (RCS) antenna using electromagnetic band-gap (EBG)-based frequency selective surface (FSS) at 8.25 GHz. Cross-shaped EBG unit cells offer zero reflection phase and −25 dB reflection magnitude at 8.25 GHz. The FSS layer consists of eight cross-shaped EBG unit cells sandwiched between two substrates to offer high absorptivity at the desired band. The circular patch antenna resonating at 8.25 GHz is placed on the top substrate having a lower dielectric constant. Four circular-shaped patches are etched at the four corners of the top layer and are coupled with two feed lines which are aligned 90° to each other at the bottom layer and interconnected diagonally to achieve polarization rotation. The proposed antenna offers a gain of 6.72 dB and an in-band RCS of −21.4 dBsm. Incident energy is backscattered into eight directions separated by angle ϕ = 45°. The proposed antenna has the RCS reduction band of 7.7–9.4 GHz. It offers normalized polarization rotation ratio more than 0.8 within the −40° to 40° angular region at the frequency band 8–8.5 GHz. The measured result using the fabricated prototype agrees well with the simulated one.

Keywords

EBG surfacefrequency selective surfacein-band RCSlow RCSpolarization rotation
Type
Antenna Design, Modelling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Special Issue 6: EuCAP 2020 Special Issue , July 2022 , pp. 803 - 813
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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