This analysis demonstrates effective impedance matching and filtering in a power amplifier, highlighting improved drain efficiency.
A high-efficiency wideband power amplifier (PA) equipped with an output filtering and matching network (OFMN) is presented in this study. Unlike conventional PAs, in which the filtering structure is often positioned after the output matching network, the proposed OFMN comprises a three-branch line coupler with open stubs and a T-shaped matching network. The coupler with open stubs achieved both filtering and wideband impedance matching functions, while the T-shaped matching network terminated at its output port with a 50 Ω load achieved better impedance matching for the entire output network. The measured results demonstrate that within the relative bandwidth of 36% ranging from 2.5 GHz to 3.6 GHz, the gain fluctuated between 10.1 dB and 11.4 dB, the output power ranged from 40.1 dBm to 41.3 dBm, and the drain efficiency varied from 63.1% to 71.6%. Overall, the proposed PA exhibited high-efficiency wideband performance.
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Huang et al. (2025) studied this question.
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