광대역 저 부엽 특성을 갖는 직선 급전 구조의 도파관 배열 안테나

A K-band waveguide array antenna with broadband and low sidelobe characteristics is designed and implemented in this paper. A straight feed configuration is adapted to connect with power amplifier at the end of the transmitter module efficiently. To meet the side lobe requirement of below 20 ㏈ in the E-plane, the horn antenna is divided into 4 sections, and they are connected with microstrip-slotline transitions fed by non-uniform microstrip power divider. Overall antenna structure is optimally designed to meet the given specification, and the measured results show a bandwidth of 28 % (21~27.7 ㎓), beamwidth of 20.3? at E-plane and 30.5? at H-plane, gain of 17.5 ㏈i, and E-plane sidelobe level of 19 ㏈ at 24 ㎓.