Abstract
In this letter, a systematic method to design compact output matching network of power amplifier (PA) is proposed, which is based on the simplified real frequency technique. The produced network is mainly constructed with commensurate transmission lines, containing cascaded unit elements and open-shunt stubs, as well as a shorted-series stub for dc bias. A GaN PA is designed to verify the method. The measured results show that the PA achieves 68.07%–79.49% drain efficiency and 40.93 to 42.4 dBm output power from 1.7 to 3.1 GHz. Moreover, the fabricated PA has a small size of only 2015 mm $^{2}$ , due to the compact matching networks.
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