In this paper, a resonant four-way divider/combiner based on finline is presented. This divider/combiner is composed of four units coupling power from finline to microstrip lines. Coupling is achieved through the microstrip probe on the top side of the dielectric substrate with the finline on the bottom side. The advantages of this divider/combiner are ease of fabrication, efficient heat sinking of MMIC, as well as its potential for high power-combining efficiency. Experiments on the four-way passive divider/combiner back-to-back design demonstrate a minimum overall insertion loss of 0.96 dB at 35.2 GHz, and the inserting loss in 34-36 GHz band is less than 1.8dB.
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