Development of VHF-Band Conformal Antenna for UAV Mounting

Abstract

In this paper, a VHF band conformal antenna for UAV mounting was developed. The proposed antenna was designed as an shape-adaptive structure by minimizing the antenna height to be advantageous in RCS reduction performance. As for the antenna radiator, the outer radiator was arranged around the inner radiator to apply the CRLH zeroth-order resonance structure. With this structure, the height of the antenna was minimized, and it was reduced by about 70 % compared to the existing blade antenna. In addition, for impedance matching, the intermediate frequency bandwidth of the VHF band was improved through the sleeve pin of the inner radiator, and the low frequency bandwidth of the VHF band was improved by applying an EMI shielding gasket to the shorting pin of the outer radiator. The proposed antenna was manufactured and measured to verify the performance of the device and the performance after UAV mounting. As a result, the standard was satisfied for the operating frequency.

X-band RADAR Reflected Signal Measurement of Gallium-based Liquid Metal

“…인 수은과는 다르게 갈륨에 기초한 액체금속은 형태 의 변형성과 인체 무해성, 높은 열 및 전기전도성으로 인해 다양한 분야에 적용이 되고 있다 [1] . 특히 무선주 파수 응용장치로서는 안테나 [2] , 전자파흡수체 [3] , 주파 수선택표면(frequency selective surface) [4] , 메타 물질 [5] 등 금속의 특성을 활용하여 다양하게 응용이 되고 있 레이더는 전자파를 이용하여 표적의 유무뿐 아니라 이동속도 및 방향과 같은 다양한 정보들을 획득하는 체계로서 레이더 반사신호는 탐지하고자하는 표적의 크기, 재질, 전도성 등의 영향을 받는다 [7]…”