Design of a quasi-optical oscillator using a grooved mirror with a HEMT array

An equivalent circuit for designing a coherent power combiner using a quasi-optical resonator has been developed. In the resonator, large numbers of devices (HEMT, HBT, etc.) are arrayed two dimensionally and mounted on a surface of a metal grooved-mirror. A newly developed equivalent circuit for the resonator has been constructed using a transmission-line model. Experiments performed at Ku-band have shown that oscillation frequencies in a 3x3 HEMT array oscillator can be predicted with errors of less than 1% by using this equivalent circuit.