Ka频段矩形波导——微带转换结构

Novel Ka-Band Waveguide——Microstrip Transition Structure

提出了一种波导到微带过渡结构的同轴探针过渡。该结构具有结构紧凑、频带宽、密封性好等优点，可以满足实际工程中对矩形波导输入口不同极化方向的要求，其波导输出端口以同轴探针为中心任意角度旋转，为射频系统工程师提供更灵活的设计方案。利用Advanced Design System（ADS）对提取电路进行了电路仿真，并与CST Microwave Studio（CST）场仿真结果进行了对比，证明了电路提取的正确性。设计加工了一对背靠背的电路进行测试，在28.8～40 GHz频段内插入损耗小于2.28 dB，回波损耗大于7.8 dB。

In this paper, a novel structure of waveguide-to-mircostrip transition is proposed. This structure is based on coaxial probe. It has the advantages of compact, wide band, and good sealing. It offers different polarization directions which meets the need of engineering applications. The output port of the waveguide can be rotated at any angle around the coaxial probe. It provides more flexible design plans for radio frequency （RF） system engineers. The comparison of the advanced design system circuit simulation results and CST Microwave studio field simulate results proves that the circuits extracted is corrected. A back-to-back transition is designed, fabricated and measured. The insertion loss and return loss of the back-to-back transition are respectively below 2.28 dB and above 7.8 dB from 28.8 GHz to 40 GHz.