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Superstrate-based patch antenna array with reduced in-band radar cross section

Published online by Cambridge University Press:  16 June 2021

S. K. Vyshnavi Das ,
Avinash Singh ,
Arti A. Gurap  and
Hema Singh Open the ORCID record for Hema Singh [Opens in a new window]
S. K. Vyshnavi Das
Affiliation:
Centre for Electromagnetics, CSIR-NAL, Kodihalli, Bangalore 560017, India
Avinash Singh
Affiliation:
Department of Electronics & Communication Engineering, IIT Roorkee, Uttarakhand 247667, India
Arti A. Gurap
Affiliation:
Centre for Electromagnetics, CSIR-NAL, Kodihalli, Bangalore 560017, India
Hema Singh*
Affiliation:
Centre for Electromagnetics, CSIR-NAL, Kodihalli, Bangalore 560017, India
*
Author for correspondence: Hema Singh, E-mail: hemasingh@nal.res.in
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Abstract

To design a low radar cross section (RCS) antenna, the major concern is not only to reduce scattering, but also to maintain its radiation parameters, viz. gain, voltage standing wave ratio (VSWR), etc. This paper presents a simple configuration of low RCS microstrip patch array with a periodic structure-based superstrate. The ground of the array is designed as reduced ground plane with high impedance surface elements, viz. rectangular patch and Jerusalem cross. The configuration of superstrate consists of multilayered, viz., two-layered and three-layered structures having partially absorbing and reflecting surfaces. In both the proposed configurations, the array gain of 12.5 dB is maintained with reduced structural RCS over the entire in-band frequency range. The reflection coefficient (~ −20 dB) and VSWR (~ 1.1) of the array are maintained. It is shown that the proposed superstrate-based patch array design has significantly reduced in-band RCS (−18 dBsm) at its resonant frequency.

Keywords

Antenna gainpatch arrayradar cross sectionstructural RCSsuperstrate
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. 790 - 802
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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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