헬기 충돌방지 레이더용 슬롯 도파관 배열 안테나 설계

Abstract

In this paper, the radar antenna of collision-avoidance radar on helicopter was suggested to X-band slotted waveguide array antenna. The slotted waveguide array antenna has plat structure. The external attachment antenna on helicopter was take affect by air resistance. Therefore, in order that apply on helicopter the radome was required slotted waveguide array antenna. The antenna requirements were antenna gain over 35dBi, side-lobe level(SLL) below -20dB. By using the baffle blocks the coupling between slot antennas. Design the height of baffle was . Wavelength of free space was 8.57mm. The waveguide using WR-28(7.1mm × 3.6mm). Bandwidth of WR-28 was 26.5~4GHz. But feeding waveguide was not equal to WR-28. Because feeding waveguide was required guided wavelength of 16.2mm. The coupling slot was tilted for coupled with radiating waveguide. Combine radiating waveguide and feeding waveguide that simulated. The overall antenna size was 248.2mm × 130.6mm. As a result, the antenna gain was 36dBi and side-lobe level was -22dB(E-plane) and -25dB(H-plane).