Broadband Waveguide-to-Microstrip Antipodal Finline Transition without Additional Resonance Preventer

This paper presents a design of waveguide- to-microstrip antipodal finline transition, which provides a broadband and low insertion loss performance needless of additional resonance frequency preventer in the model. The suppression of resonance frequency depends on the self-structure of the antipodal finline transition. Meanwhile several factors affecting transition performance are taken into account. The design was verified by experimental results at Ka-band, which has a coincidence with the results of simulation. The compact transition design could decrease the complexity of antipodal finline transition and effect of manufacture error.