Wideband RCS Reduction of Microstrip Array Antenna Based on Absorptive Frequency Selective Surface and Microstrip Resonators

Jingjing Xue,Shuxi Gong,Wen Jiang

doi:10.1155/2017/1260973

Jingjing Xue, Shuxi Gong + Show 1 more

Open Access

https://doi.org/10.1155/2017/1260973

Copy DOI

Abstract

An approach for wideband radar cross section (RCS) reduction of a microstrip array antenna is presented and discussed. The scheme is based on the microstrip resonators and absorptive frequency selective surface (AFSS) with a wideband absorptive property over the low band 1.9–7.5 GHz and a transmission characteristic at high frequency 11.05 GHz. The AFSS is designed to realize the out-of-band RCS reduction and preserve the radiation performance simultaneously, and it is placed above the antenna with the operating frequency of 11.05 GHz. Moreover, the microstrip resonators are loaded to obtain the in-band RCS reduction. As a result, a significant RCS reduction from 1.5 GHz to 13 GHz for both types of polarization has been accomplished. Compared with the reference antenna, the simulated results exhibit that the monostatic RCS of the proposed array antenna in x- and y-polarization can be reduced as much as 17.6 dB and 21.5 dB, respectively. And the measured results agree well with the simulated ones.

Highlights

With the rapid development of the defense electronics and advanced detection technology, much attention has been paid to the reduction of radar cross section (RCS)
When the absorptive frequency selective surface (AFSS) works in the receiving mode, a strong current will be induced on the absorbing layer and the energy is consumed with the lumped resisters
Based on the above results, one can deduce that the proposed AFSS could reduce the out-of-band RCS remarkably and preserve the radiation performance of the microstrip antenna at the same time

Summary

Introduction

With the rapid development of the defense electronics and advanced detection technology, much attention has been paid to the reduction of radar cross section (RCS). By replacing the PEC and AMC with two different AMC cells, 180∘ (±30∘) reflection phase difference is obtained in a broadband frequency region, achieving the wideband RCS reduction [11]. Another approach based on the principle of passive cancellation is the implementation of the polarization conversion metasurfaces [12,13,14]. In [21, 22], the absorptive frequency selective surface (AFSS) with the absorbing band locating lower than the transmission band is introduced, but the designs are polarization dependent because of the asymmetric structure. All simulation works are accomplished by using Ansoft’s High Frequency Solution Solver (HFSS) software

AFSS Design

Integrated Design of Antenna and AFSS

Integrated Design with Microstrip Resonators

Conclusion