저궤도 위성용Ka-band 메쉬 안테나 반사판의 열 해석 및 성능 검증 (Thermal Analysis of Ka-Band Mesh Antenna Reflector for LEO Satellites)

서지정보

· 발행기관 : 한국전자파학회
· 수록지 정보 : 한국전자파학회 논문지 / 36권 / 1호 / 1 ~ 9페이지
· 저자명 : 김연재, 구경래, 이재욱

초록

최근초소형위성을저비용/단기간으로대량생산하여지구저궤도에서군집을이뤄운용하는저궤도군집위성통신시스템이주목받고있다. 그에따라경량화반사판안테나인메쉬안테나에관한연구가활발하게이루어지고있다. OPI (openings per inch)는 메쉬 제직 밀도의 척도로, OPI가 커질수록 메쉬 안테나의 성능은 좋아지나비용과무게가증가한다는단점이있다. 따라서본논문의초반부에서는목표이득이상을달성하는최소OPI를제안하였으며그결과, 본연구의목표이득인50 dBi 이상을달성하는OPI는40 OPI로도출되었다. 위성에탑재된메쉬안테나는극한의온도환경에서운용되며, 특히저궤도위성은하루에도여러차례큰온도변화를겪는다. 이러한우주의온도변화는메쉬안테나의반사판에열변형을가해안테나의성능에도영향을미친다. 본논문에서는메쉬안테나가겪을수있는최대열변형환경을 가정하여 실제사용되고있는몰리브덴메쉬반사판에대한열적신뢰성을검증하였다.

영어초록

With recent advances in low earth orbit (LEO) satellite communication systems, research on deployable antennas, specifically mesh antennas, has been actively conducted. The performance of the mesh antenna can be improved by increasing the opening per inch (OPI), which is a measure of mesh weaving density. However, a higher OPI can also increase cost and weight. Therefore, this study proposes a minimum OPI that achieves the target gain. The results indicate that an OPI of 40 is sufficient to achieve 50 dBi, which is the target gain in this research. Mesh antennas mounted on satellites operate in extreme temperature environments, particularly when LEO satellites experience significant temperature fluctuations multiple times daily. These extreme temperature changes deform the mesh reflector and affect the performance of the antenna. This study assumes a maximum thermal deformation environment that a mesh antenna may en counter and verifies the thermal reliability of the molybdenum mesh reflector currently in use.

참고자료

· 없음