Broadband suspended stripline to air-filled rectangular waveguide transition


A broadband transition between a suspended stripline (SSL) and an oblong waveguide is presented. To boost the bandwidth of the transition, a U-shaped patch is introduced. A back-to-back transition prototype has been designed and fabricated for purpose of verification. Experimental results show that the transition has an insertion loss of less than 0.26 dB and a come back loss better than 18.five dB over the complete Ka-band (twenty six.five–40 GHz), that agrees well with the simulated results. As compared with the SSL-to-waveguide transition employing a reduced-height waveguide, the fractional bandwidth is increased from 29.5 to forty.ninepercent. Moreover, with the reduced-height waveguide removed, the circuit structure has been simplified. The proposed transition provides a good performance whereas maintaining a easy circuit structure.

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