A 200–325-GHz Wideband Terahertz Frequency Tripler Using Waveguide Wedge Iris Match

This letter reports a Schottky-based wideband 200–325-GHz terahertz (THz) frequency tripler adopting a waveguide wedge iris (WWI) match instead of a conventional reduced-height waveguide (RHW) match. The wedges in this letter provide the auxiliary impedance matching and in-line cavity configuration in one structure. The auxiliary matching function is derived from the capacity to implement both shunt capacitive iris (CI) and RHW matching of WWI in a simultaneous manner. Due to the merits of design flexibility and structure compactness, a WR-3 band THz monolithic integrated frequency tripler based on the matching waveguide wedges is fabricated and then packaged in an extremely small flange-like cavity. The verified tripler exhibits a conversion efficiency of 2%–6.6% across the bandwidth of 200–325-GHz under 150 mW of pumped power.