Title :
Millimeter-Wave Power Amplifier Based on Coaxial-Waveguide Power-Combining Circuits
Author :
Song, Kaijun ; Fan, Yong ; Xue, Quan
Author_Institution :
EHF Key Lab. of Fundamental Sci., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
A millimeter-wave power amplifier based on a coaxial-waveguide power-combining circuit is presented in this paper. A coaxial stepped impedance transformer is used to provide an impedance transition from the 50-?? input coaxial line to the oversized coaxial waveguide, and its equivalent-circuit model has also been developed. A Ka-band four-device coaxial-waveguide power amplifier is fabricated and tested. The 10-dB return loss bandwidth of the fabricated amplifier is from 27.5 to 40 GHz, and the power amplifier has 17-25.9 dB gain over a wide bandwidth from 26 to 38 GHz. The measured output power at 1-dB gain compression is about 26.6 dBm at 30 GHz, with a power-combining efficiency of about 90%.
Keywords :
coaxial waveguides; equivalent circuits; impedance convertors; millimetre wave power amplifiers; power combiners; Ka-band four-device power amplifier; coaxial stepped impedance transformer; coaxial-waveguide power-combining circuits; equivalent-circuit model; frequency 27.5 GHz to 40 GHz; gain 17 dB to 25.9 dB; loss 10 dB; millimeter-wave power amplifier; return loss bandwidth; coaxial waveguide; millimeter wave; power amplifier; power combiner; power divider;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2009.2035965
