A NOVEL KA-BAND SOLID-STATE POWER COMBINING AMPLIFIER

Abstract

This paper presents a high-e-ciency Ka-band solid-state power combining amplifler on the basis of a novel waveguide magic tee. By employing 16 low-power amplifler modules and compact waveguide power combining network with a low loss microstrip-to-waveguide transition, the output loss of the combining circuit is minimized, so a high combining e-ciency larger than 85% from 34 to 36GHz is obtained. Modular architecture is adopted in the combiner design. The single amplifler, bias circuit and heat sink are all fabricated separately, which add great ∞exibility to the system. Modular ampliflers can be premade and reserved in case any malfunctioning amplifler needs to be replaced. In addition, the improved power combining amplifler has the advantages of low loss, high isolation, compact structure, excellent heat-sink, etc.