Design of a broadband high‐efficiency power amplifier based on a miniaturized three‐coupled line structure

The extended continuous inverse Class‐GF mode with a large available impedance space is employed in the design of the multioctave power amplifier (PA) presented in this paper. A novel miniaturized three‐coupled line structure is combined with the extended continuous inverse Class‐GF mode to achieve ultra‐wideband high‐efficiency PAs. The novel miniaturized three‐coupled line structure is analyzed in detail to meet the design requirements. To verify the effectiveness of the proposed method, a PA working in 0.7–3.0 GHz with a relative bandwidth of 124.3% is designed and fabricated by using CGH40010F. Measurements demonstrate that the output power is from 39.8 to 42.3 dBm, the drain efficiency is between 63.2% and 73.1%, the power added efficiency is from 60.4% to 71.3%, and the gain is from 9.7 to 12.3 dB. The designed PA achieves wide bandwidth and high efficiency while effectively reducing size to facilitate integration.