A Ka-Band 8 W Power Amplifier Module Using 4-Way Waveguide Power Combiners with High Isolation

Abstract

In this paper, a Ka-band 8 W power amplifier module with WR-28 waveguide input and output ports is implemented and measured using four 2 W power amplifier modules and 4:1 waveguide power combiners with high isolation of 25 dB at 35 GHz. The 2 W power amplifier modules are fabricated using waveguide-to-microstrip transitions and show output power of 32.5～33.3 dBm and power gain of 26.9～28.7 dB at 35 GHz. Four 2 W power amplifier modules are combined through 4:1 waveguide power combiners with resistive septum and the combined power shows 39.0 dBm(8 W) under 6 V drain bias and 39.6 dBm(9.1 W) under 6.5 V drain bias at 35 GHz. , 국내의 경우 최근에서야 40 dBm 출력의 전력증폭기 모듈이 개발 되었다 [2] . 고출력 전력증폭기 모듈을 구현하기 위해 개별 MMIC 칩들을 알루미나(Alumina) 기판에서 전 력 합성하는 방법은 큰 마이크로스트립 전송 선로의