RCS reduction of array antenna using circulator and phase shifter

Abstract

This paper presents RCS reduction technique of array antenna using circulator and phase shifter. In this RCS reduction technique, the antenna mode scattered field, which is the re-radiated field of antenna, is controlled by the phase shifter to cancel out the structural mode scattered field. In this paper, a measurement method is proposed to measure the amplitude and phase of the antenna mode of each element and the structural mode of the whole array for the deterministic RCS reduction. A RCS synthesis method is also proposed to achieve wide angle RCS reduction. The effectiveness of the proposed methods are demonstrated by experiments using an 8-element array antenna with circulators and digital phase shifters.