OPTIMIZATION OF A 250-GHZ SCHOTTKY TRIPLER USING NOVEL FABRICATION AND DESIGN TECHNIQUES

A technique for optimizing a diode waveguide mount for millimeter- and submillimeter-wave applications has been developed. The structure con sists of a planar rectangular radiator for which an accurate derivatio n of impedance is available. The planar radiating probe incorporates t he diode contacting tip, is fabricated integrally with the microstrip filter, and is used in a 230-290-GHz frequency tripler, Modification o f the tripler using the described technique resulted in an improvement of approximate to 6 dB in available output power, compared to the aut hors' previous results for this device, Device output power exceeds 8. 5 mW at 245 GHz for an input power of 132 mW, The best flange-to-flang e efficiency (in excess of 11%) was achieved at 3.3-mW output power. T his technique was then applied to a waveguide mount, incorporating two diodes contacted in parallel, so that greater input power could be ha ndled. This resulted in a tripler with a maximum output power of 15 mW at 270 GHz for an input of 280 mW.