A 3.3-3.7 GHz Broadband Doherty Power Amplifier

This paper presents the design of a broadband Doherty power amplifier (DPA) based on GaN transistor for 5G communication. Double-points matching method and post-matching technology are used to design output matching network of main power amplifier and power combine network to overcome the narrow characteristic of conventional DPA with two quarter wavelength microstrip lines as impedance inverters. In the frequency band of 3.3-3.7 GHz, the simulation results show the saturation drain efficiency of 59-66% and the efficiency of 47– 51% at 6-dB output back-off power level. The saturation output power of the DPA is 43.9-44.6 dBm with the power gain of 10.8- 11.4 dB.

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