一种220 GHz波导-悬置微带线过渡电路设计

A design of waveguide to suspended substrate microstrip line transition at 220 GHz

摘要:

波导-微带过渡电路是连接毫米波、太赫兹系统中平面电路与波导的重要结构，直接影响系统性能。设计了一种中心频率220 GHz的矩形波导-悬置微带线过渡电路。过渡采用探针耦合的形式，并使用渐变线结构实现宽带阻抗匹配，这种结构具有结构紧凑，易于加工，宽带和插入损耗低等优点。最终的仿真结果表明：在180~255 GHz的频带内回波损耗优于20 dB，插入损耗小于0.18 dB。这种结构可广泛应用于毫米波、太赫兹平面电路中。

Abstract:

Waveguide-to-microstrip transitions are indispensable in millimeter and terahertz system to combine planar integrated circuits with waveguide transmission elements, which show great impacts on system performance. A rectangular waveguide to suspended substrate microstrip line transition at 220 GHz is proposed. The transition uses probe coupling and continuously tapered line to achieve broadband impedance match. This structure is compact, easy to process，broadband and has low insertion loss. The simulated results show that its return loss is better than 20 dB and insertion loss is less than 0.18 dB from 180 GHz to 255 GHz. This structure can be widely used in the planar circuits in millimeter wave and terahertz realm.