Open AccessHighly efficient broadband class‐J power amplifier using modified multisection quarter‐wave lines and short‐circuited stubs
Author(s) -
Liu Chang,
Cheng QianFu
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5637
Subject(s) - broadband , amplifier , high electron mobility transistor , electronic engineering , electrical engineering , harmonic , engineering , optoelectronics , materials science , telecommunications , bandwidth (computing) , physics , voltage , transistor , acoustics
This study presents a broadband and high‐efficiency Class‐J power amplifier (PA)‐based on a modified multisection quarter‐wave lines and short‐circuited stubs matching network (MN). It is noted that the modified structure, with good design convenience and great frequency selectivity, especially in the roll‐off region between the highest frequency of the desired band ( f H ) and second harmonic of the lowest frequency of the band (2 f L ), is for the first time employed to design PAs with more optimal performance and greater bandwidths (BWs). A step‐by‐step design procedure of the proposed structure is presented. Experimental results show that using a 10‐W Wolfspeed GaN HEMT device, a highly efficient broadband Class‐J PA is realised from 1.4 to 2.4 GHz (fractional BW = 52.6%) with measured drain efficiency of 63.0–68.9% and output power of 39.8–40.3 dBm.