Abstract
A compact and broadband rectangular waveguide-to-half mode substrate integrated waveguide (HMSIW) transition based on antisymmetric tapered probes is proposed. The antisymmetric tapered probes are used to change the quasi-TE0.5,0 mode in the HMSIW to the TE10 mode in the rectangular waveguide. To verify the proposed transition circuit, a back-to-back transition structure has been designed, fabricated and measured. The measured results show that an insertion loss less than 1.6 dB and a return loss better than 14 dB at 26–40 GHz are obtained for a back-to-back transition. Compared with the waveguide-to-HMSIW transition using antipodal fin-line, the size of the proposed transition circuit is reduced by approximately 71 %. The high performance, compact size and simple structure, enable such transition to be employed in a number of other millimeter-wave applications.
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