Characteristics of transition between coaxial cable and NRD guide using image NRD guide at 60 GHz

A transition between an LSM-NRD guide and a coaxial cable was designed and fabricated at 59 GHz. Main emphasis was placed on a simple and rigid structure. Moreover, a technique to suppress unwanted radiation generated at slightly-asymmetrical structure was installed in this transition, and thus a low loss transformer whose insertion loss was measured to be less than 0.2 dB was successfully fabricated.