Compact broadband high‐efficiency power amplifier using terminated coupled line filter matching network

Abstract

This article presents a compact broadband high‐efficiency power amplifier (PA) with a filtering structure. Unlike the cascaded filter behind the traditional PA, the proposed cascaded branch load coupling microstrip line structure is used to design the output matching network (OMN) of the PA. It plays the roles of impedance matching and filtering, which is called a filtering OMN, the overall size of the circuit will be reduced. Two coupled microstrip lines cascaded are used to extend the working bandwidth, and a microstrip line is loaded to the port of the coupled microstrip lines to ensure high selectivity and good out‐of‐band performance. For verification, a broadband high‐efficiency PA is designed and manufactured by using CGH40010F GaN HEMT. Measurements demonstrate that in the range from 1.2 to 3.6 GHz, the saturated output power is from 39.8 to 41.8 dBm, the drain efficiency (DE) with a 62%–73%, and the gain is between 9.9 and 11.7 dB.

A Dual-Band Dual-Output Filtering Power Amplifier Based on High-Selectivity Filtering Impedance Transformer

“…With the rapid development of 5G communication, RF/ microwave components have faced high demands for working at multiple frequencies to improve spectral efficiency. And as a key component of RF/microwave systems, the PA that can operate at multiple frequencies has attracted researchers' attention, such as broadband PAs [12][13][14] and dual-band PAs [15][16][17][18][19]. Dual-band input matching network (IMN) and OMN are employed to complete designs of dual-band PAs in [15][16][17][18].…”