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In this paper, the harmonics suppressed band-pass matching network for high efficiency power amplifier (PA) that can provide operating band impedance matching as well as suppressed out-of-band signals simultaneously is proposed. The proposed harmonics suppressed band-pass matching network consists of a coupled line, a λ/2 length open stub, and a λ/6 length bias line terminated with a bypass capacitor for drain bias. For an experimental validation, the PA with the proposed output harmonics suppressed band-pass matching network was designed and fabricated at the 2.14 GHz (WCDMA band). The measurement results show that the output power and drain efficiency at saturation point are 42.7 dBm and 71.2%, respectively. Compared with reference class F −1 PA, the proposed PA has more sharp out-of-band suppression characteristic.
Jeong et al. (Sun,) studied this question.