High-power c.w. transferred-electron oscillators

C.W. operation of high-power transferred-electron oscillators (t.e.o.s) is described. A maximum power output of 0.78 W at 8.7 GHz with an efficiency of 2.5% was obtained. This is believed to be the highest c.w. power output reported to date for a single t.e.o. in this frequency range. This high-power output is attributed to improved fabrication technology leading to a thermal resistance of only 8 deg C/W for a 0.015×0.015 in chip.