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A via-hole-less planar microstrip-to-waveguide transition is proposed. A proximity coupling type transition requires via holes to prevent a leakage of parallel plate mode in the substrate. We propose to replace the via holes to the choke structure. In order to remove the via holes of the proximity coupling type transition, a choke of the parallel plate waveguide was applied. The dimensions of the...
Broad-wall connected microstrip-to-waveguide transition using a waveguide with large broad-walls is proposed. Maximum width of the waveguide where higher order mode dose not propagate is used. The dimension of the rectangular patch element is examined to have optimum width for wideband. Moreover, the distance from the edge of the broad-wall of the waveguide to via holes is also examined to have optimum...
Broadband microstrip-to-waveguide transitions are developed in the millimeter-wave band. Two types of novel transitions are developed first. One is a quite broadband transition with an air back-short waveguide in a metal block. In order to avoid the use of an additional part of the metal block, we developed a transition in the multi-layer substrate. Double resonance is a key feature for the broadband...
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