Design of extend continuous Class-B/J mode broadband and high efficiency power amplifier with a novel E-shaped resonator filter

In this letter, we propose a method to design wideband high-efficiency power amplifiers (PAs) based on extended continuous Class-B/J (ECCB/J) modes with a new low-pass filter (LPF). This LPF consists of many E-shaped resonators. Its capability to control harmonic impedance matching allows for improvements in both efficiency and bandwidth. And it can also contribute to a broadband impedance matching in the predefined optimal impedance region with the combination of ECCB/J modes. To verify the proposed methodology, we designed and fabricated a wideband high-efficiency PA using a commercial 10-W GaN device. The measured results show that in the target frequency band from 0.5 to 3.0 GHz, a drain efficiency (DE) of 58.5%-78.5% and a gain of 9.6-12.2dB can be obtained and a saturated output power of 39.6-42.2 dBm when the input power is 30dBm.