In this paper, we propose a deployable broadband mesh reflector antenna for use in signals intelligence (SIGINT) satellite systems, considering performance degradation due to shape deformation. To maximize gain by increasing the diameter of the reflector while reducing the weight of the antenna, the reflector of the antenna is designed using lightweight silver-coated Teflon mesh. The mesh reflectors are typically expanded by tension to maintain their parabolic structure; thus, shape deformation cannot be avoided. This shape deformation results in shape differences between the surface of the mesh reflector and the ideal parabolic reflector, thus resulting in the degradation of the performance of the mesh reflector antenna. To observe this degradation, we analyze antenna performance according to the number of arms, the number of joints, the feed distance, and the distance from the reflector center to each joint. The performance of the mesh reflector antenna is examined using an effective lossy conducting surface (ELCS) that has the same reflectivity as the silver-coated Teflon mesh to reduce simulation time and computing resources. The designed silver-coated Teflon mesh reflector and the double-ridged feed antenna are fabricated, and the bore-sight gain is measured using the three-antenna method. The measured bore-sight gain of the proposed antenna is 31.6 dBi at 10 GHz, and the measured and simulated results show an average difference of 3.28 dB from 2 GHz to 18 GHz. The proposed deployable mesh reflector antenna can be used in a variety of applications where small stowed volume is required for mobility, such as mobile high-gain antennas as well as satellite antenna systems. Through this study, we demonstrate that shape deformation of the mesh reflector surface significantly affects the performance of reflector antennas.

한국전자파학회논문지 (The Journal of Korean Institute of Electromagnetic Engineering and Science)

한국전자파학회논문지 (The Journal of Korean Institute of Electromagnetic Engineering and Science)

레이다를 대상으로 하는 전자공격 체계는 광대역 고출력의 잡음 신호를 방출함으로써 레이다의 기능을 무력화 시키거나 허위 표적 신호를 송출함으로써 아군 무기체계의 생존성 및 작전 운용성을 높이게 된다. 레이다 재밍 시스템에서 기만 성능을 높이기 위해서는 레이다의 기본적인 파라미터 분석 외에도 레이다의 스캔 주기 추정이 필요하다. 본 논문에서는 탐색 레이다의 주파수, 펄스폭, 반복 주기, 펄스의 크기 및 도달 시간 정보 등 기본적인 PDW 정보를 기반으로 칼만 필터를 활용하여 탐색 레이다의 스캔 주기를 추정하는 방법에 대해 제안하였다. 본 논문에서는 추정된 스캔 패턴을 기반으로 탐색 레이다를 대상으로 하는 기만 신호를 생성하는 방안에 대해 기술하였으며, HILS를 통해 검증한 결과를 제시하였다.