Abstract
본 논문에서는 항공기 탑재용 경량화 지지 구조를 갖는 평면 LPDA(Log-Periodic Dipole Array) 안테나를 제안한다. 제안된 안테나는 항공기 탑재에 적합하도록 가볍고, 구조적 진동에 견딜 수 있는 평면형 골격 지지 구조를 적용하여 설계하였다. 평면형 골격 지지 구조의 재질은 강도와 온도 특성이 우수한 Peek(Polyether ether ketone)를 사용하였으며, 제안된 안테나는 지지 구조 양면에 LPDA 안테나 방사소자를 결합하여 제작되었다. 지지 구조 유전체로 인하여 변화된 입력 임피던스는 일부 방사소자 간격과 길이를 조절하여 매칭시켰다. 설계된 평면 LPDA 안테나의 10-dB 반사손실 대역폭은 시뮬레이션 및 측정 결과, 각각 0.4~3.1 GHz(7.3:1), 0.41~3.5 GHz(8.2:1)로 광대역이었다. 평균 이득은 0.5~3 GHz 대역내에서 시뮬레이션은 평균 6.77 dBi, 측정은 6.55 dBi이었다. 따라서 설계된 안테나는 가볍고 견고한 구조와 광대역 지향성 방사특성을 가져 항공기 탑재 용도로 적합함을 확인하였다. This paper proposes a planar Log-Periodic Dipole Array(LPDA) antenna with light-weight supporting structure for installing on an aircraft. The proposed antenna is designed by applying a planar skeleton supporting structure that has light-weight for an aircraft and is capable of withstanding structural vibration. The material of the planar skeleton supporting structure is a Polyether ether ketone(Peek) which has excellent characteristics on strength and temperature. The proposed antenna is fabricated by attaching the radiating elements of the LPDA on both sides of the supporting structure. The changed input impedance due to the dielectric material of the supporting structure was compensated for by controlling the distance and length of several radiating elements. The 10-dB return loss bandwidths of the designed planar LPDA antenna with light-weight supporting structure are obtained as 0.4~3.1 GHz(7.3:1) in the simulation and 0.41~3.5 GHz(8.2:1) in the measurement. The average gains in 0.5~3 GHz band are 6.77 dBi in the simulation and 6.55 dBi in the measurement. Therefore, we confirm that the designed antenna is appropriate to be installed on an aircraft due to its light-weight structure and wideband directional radiation characteristics.
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More From: The Journal of Korean Institute of Electromagnetic Engineering and Science
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