Broadband RCS Reduction of Antenna with AMC Using Gradually Concentric Ring Arrangement

Fuwei Wang,Yuhui Ren,Ke Li

doi:10.1155/2017/1268947

Abstract

This paper proposes a new method to the broadband RCS reduction with the artificial magnetic conductor (AMC) surfaces. The AMC surfaces can introduce a zero-degree reflection phase shift to incident waves. The phase difference between the antenna and AMC structures is 180°. Therefore, the AMC structures can be used to achieve RCS reduction. However, the bandwidth of zero-degree reflection phase of AMC structures is very narrow. In light of this, a novel gradually concentric ring arrangement AMC (GCRA-AMC) which can be applied to achieve the broadband RCS reduction is presented. The simulated and measured results show that the radiation performance of antennas is preserved when the GCRA-AMC is used. The RCS of the antenna with GCRA-AMC has been considerably reduced in a broad frequency band. The largest RCS reduction is more than 17 dB.

Highlights

With detection and stealth technology develops rapidly, radar cross section (RCS) reduction has received a lot of attention to different applications
Many new materials are applied to the RCS reduction of antenna, such as the electromagnetic bandgap (EBG) structures which have been widely studied for their behavior as artificial magnetic conductor (AMC) [5,6,7]
The simulated and measured results show that the radiation performance of antennas is preserved when the GCRA-AMC is used

Summary

Introduction

With detection and stealth technology develops rapidly, radar cross section (RCS) reduction has received a lot of attention to different applications. It is very difficult to achieve the RCS reduction of the antenna without deteriorating the radiation properties. Many new materials are applied to the RCS reduction of antenna, such as the electromagnetic bandgap (EBG) structures which have been widely studied for their behavior as AMC [5,6,7]. The phase difference between the antenna and AMC structures is 180°, and the AMC structures can be used to RCS reduction purposes. The EBG is used to the RCS reduction of the patch array antenna [11] These methods and applications are limited to a narrow band. The configuration of AMC is rearranged, and a nonperiodic AMC structure of a gradually concentric ring arrangement is proposed in this paper This arrangement of the new AMC makes the equivalent capacitance linearly varies.

Ground

Design of the Gradually Concentric Ring Arrangement AMC

Conclusion