LAUSR

This presents a broadband high-efficiency power amplifier (PA). The branch line coupler is used to design the output circuits of the PA. By appropriately selecting the impedance conditions of terminal ports, the branch line coupler can not only realize impedance conversion but also realize harmonic impedance control. Two-stage couplers are exploited to expand the working bandwidth. To verify the effectiveness of the proposed method, a broadband high-efficiency PA is designed and fabricated by using CGH40010F. Measurements demonstrate that the saturated output power is from 41.0 to 42.5 dBm, the drain efficiency is between 64% and 75%, and the gain is from 10.2 to 11.5 dB.