A high efficiency RTD-based sub-THz differential oscillator pair for a spatial power combining array

Abstract

Summary form only given. A resonant tunneling diode (RTD)-based sub-THz differential oscillator pair for a spatial power combining array is proposed. The fabricated RTD differential oscillator pair shows a radiated output power of 89.3 μW at an oscillation frequency of 683 GHz with a total DC power consumption of 28.4 mW. A high DC-to-RF efficiency of 0.32 % and a power combining efficiency of 92% have been obtained due to the effective power combining using the differential topology and the associated array configuration with low DC power consumption.