A broadband high efficiency class AB GaN HEMT balanced power amplifier

In this paper, a broadband high efficiency Class-AB balanced power amplifier (PA) is presented. The proposed PA offers a high efficiency of > 43% for a band of 400 MHz to 1.4 GHz. The broadband matching circuits were realized with microstrip-radial-stubs (MRS) on low loss Rogers 5880 substrate with 0.78 mm thickness and 2.2 dielectric constant. The input and output matching is better than −13 dB throughout the band. The PA delivers maximum output power of 41.5 dBm with a flat gain of 11.4–13.5 dB. Due to high gain, stability, efficiency, and broadband, the proposed PA is thus suitable for recent and upcoming wireless communication systems.