플루티드 코어 기반 주파수 가변 능동형 레이더 흡수 구조 설계 및 성능 분석

Abstract

This paper presents the design of a frequency-tunable radar absorber based on a fluted core that can actively adjust the absorption frequency within a wide bandwidth (4-18 GHz). The proposed active radar absorber structure consists of a resistive sheet and a glass fiber-based sandwich composite, with a Cu-plate inserted into the internal space of the fluted core to serve as the frequency-tuning device. The frequency-tuning methods applied include gap tunable, angle tunable, and multi-array configuration, and the absorption performance was compared and analyzed. The results showed that the gap and angle tunable methods achieved more than 90% absorption performance in the C-Ku band (4-18 GHz). In contrast, the multi-array method had a relatively narrow frequency tuning range and could not achieve more than 90% absorption performance within the target frequency band. Additionally, combining the gap and angle tunable methods demonstrated improved electromagnetic wave absorption performance compared to using a single method.