A 410-510GHz Room Temperature Local Oscillation Source for SIS Mixers

A 410-510GHz local oscillation source for SIS mixers has been designed, fabricated, and tested. The source is a × 24 frequency multiplier working at room temperature. It converts the input low band microwave signals to submillimeter signals. It is comprised of an E band quadrupler, a bandpass filter, a power amplifier, a D band doubler and a final trippler. Both of the D band doubler and the final trippler use plannar Schottky diodes and quartz based circuits to realize frequency multiplication. Over the 410-510GHz band, the output power of the source is above 50uW, and the maximum is 122uW in 461.8GHz. A horn antenna is connected with the source to radiate the power to SIS mixers which are used for submillimeter radio telescope in Purple Mountain Observatory in China.