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A novel waveguide-to-microstrip inline transition was proposed using a wedge-waveguide iris to form an ultra-compact U-bend waveguide. The wedge-waveguide iris not only functioned as a wide wall of the height-reduced waveguide for the E -plane probe, but also played a critical role in impedance matching and parasitic resonance suppression. The working principle was investigated through theoretical analysis and full-wave simulation, and the relevant design processes for the transition were discussed. Moreover, two back-to-back transition prototypes, one working at the W -band and the other working at the WR4. 3 band, were designed, fabricated, and measured. The back-to-back prototypes obtained an insertion loss of less than 0. 8 and 1. 2 dB, with a return loss better than 15 dB in the W -band and WR4. 3 band, respectively. The measurement results were consistent with simulation results. A miniaturized 110-GHz tripler incorporating this transition for inline output was fabricated. A conversion efficiency of 2. 5%–3. 6% was achieved in 90–120 GHz at 100-mW driving power.
Wu et al. (Fri,) studied this question.
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