Experimental and numerical investigation of a microstrip to NRD transition

Transitions between microstrip and NRD-guide are required by integrating NRD circuits to planar circuits and NRD circuit measurement. The transition proposed in [1] offers a promising solution in view of practical applications, but it has to be accurately modeled and optimized to achieve its best possible performance. In this paper, the transmission line matrix (TLM) method has been successfully used in the simulation of such a transition. It is found that theoretical results are in good agreement with experiments. This may provide an alternative way to field-theoretically design this structure at desired microwave and millimeter-wave frequencies.