Abstract
본 논문에서는 X-대역 동작 주파수 재구성이 가능하며, 격리도가 향상된 대역 통과 재구성 주파수 선택 표면구조(frequency selective surface)를 설계하였다. 제안된 재구성 FSS의 단위구조는 Four-legged loaded 소자와 인덕턴스 성분의 스터브 그리고 전원 인가를 위한 바이어스 그리드로 구성되어 있으며, Four-legged loaded 소자와 스터브 사이에 위치한 핀 다이오드의 ON/OFF 상태를 통해 단위구조의 전기적인 길이를 조절함으로써 동작 주파수의 재구성 특성을 구현하고, 스터브의 길이 조절을 통해 원하는 동작 주파수의 조절이 가능하며, ON/OFF 상태의 투과 특성간 향상된 격리도 특성을 얻을 수 있다. 재구성 FSS를 제작하여 구형 도파관 WR-90을 이용한 투과 특성 측정을 통해 설계 결과와 비교적 잘 일치하는 것을 확인하였다. This paper presents the design of reconfigurable frequency selective surfaces for X-band bandpass operation with improved isolation. The proposed reconfigurable FSS is composed of a four-legged loaded element, a inductive stub and a bias grid. The PIN diode is located between the four-legged loaded element and the stub, which can control the frequency response of reconfigurable FSS by ON/OFF state. By adjusting the length of the stub, the desired bandpass frequency and the improved isolation between ON and OFF state can be obtained. For validation of simulated results, we have carried out transmission characteristic measurements using rectangular waveguide of WR-90. The measured results are in good agreements with the simulated results.
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