Min-Su Jang*, Ho-Beom Kim*, Heon-Suk Hong*†
* Agency for Defense Development
장민수*·김호범*·홍헌석*†
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We proposed a high-temperature circuit-analog radar absorbing structures (CA-RAS), and evaluated radar absorption performance and tensile properties in 350oC and a hot-wet environment. The CA-RAS was implemented with a glass/cyanate ester composites and a square resistive pattern layer, and reflection loss was measured by 350oC and after exposure of hot-wet condition using free space measurement. And the tensile strength at 350oC and after exposure of hot-wet condition was measured according to the ASTM D638. The proposed CA-RAS showed a 4 GHz of -dB bandwidth and -20 dB of a peak value at 350oC. In addition, there was no deterioration in absorption performance after exposure to a hot-wet condition. The tensile strength value of more than 95% compared to the strength of the glass/cyanate ester composite was confirmed at 350oC and after exposure of hot-wet condition. Through this, the applicability of CA-RAS proposed in this study was confirmed as a load bearing structure for stealth weapon exposed to high temperature and hot-wet environment
본 연구에서는 고온용 Circuit-analog 전파흡수구조(CA-RAS)를 제안하고, 350oC 및 열 수분 환경에서의 전파흡수성능 및 인장 물성을 평가하였다. Glass/cyanate ester와 사각형 저항 패턴층을 통해 CA-RAS를 구현하였으며, 자유공간 측정장비를 이용하여 350oC 환경과 열 수분 환경 노출 후의 반사손실을 측정했다. 또한 ASTM D638 규격에 따라 환경 노출 후의 인장강도를 측정했다. 제안된 CA-RAS는 350oC까지 4 GHz 이상의 -10 dB 흡수 대역과 -20 dB 이상의 피크 값을 보였으며, 열 수분 환경 노출 후에도 전파 흡수 성능의 저하가 확인되지 않았다. 또한 환경 노출 후에도 Glass/cyanate ester의 상온 인장강도 대비 95% 이상의 인장강도 값이 확인되었다. 이를 통해 본 연구에서는 제안된 전파흡수구조의 고온 및 열 수분 환경에 노출되는 저피탐 구조물로서의 적용 가능성을 확인하였다
Keywords: 고온용 복합재료, 전자파흡수구조, Circuit-analog 흡수체, 열 수분 환경
2023; 36(5): 335-341
Published on Oct 31, 2023
Agency for Defense Development