High efficiency power amplifier with frequency band selective matching networks

In this article, a high efficiency power amplifier (PA) with frequency selective matching networks (MNs) that can provide passband impedance matching as well as suppression of out‐of‐band signals simultaneously is proposed. The proposed frequency selective MN consists of a λ/4 length coupled line, a λ/2 length open step‐impedance resonator stub, and a λ/6 length bias line terminated with a bypass capacitor. For experimental validation, the PA with input and output frequency selective MNs is designed and fabricated for the US PCS band (1.93–1.99 GHz). The measurement results show that the output power and power add efficiency are 43 dBm and 70.3%, respectively, at the center frequency of 1.96 GHz, and the out‐of‐band suppression is higher than 32 dB. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2031–2034, 2015