A Bandpass Power Combined Amplifier Based on All-Ports Reflectionless Filtering Power Divider

Abstract

This article proposed a bandpass power combined amplifier (BPCA) based on an all-ports reflectionless filtering power divider (ARFPD). The ARFPD integrates the functions of filtering, power division/combination, and stopband signal absorption. In addition, to verify the proposed BPCA, a low-voltage 3–4GHz continuous Class-F power amplifier (PA) using a gallium arsenide (GaAs) pseudomorphic high electron mobility transistor (pHEMT) was designed. The proposed BPCA has the characteristics of good filtering, harmonic suppression, and out-of-band absorption. To validate the proposed structure, the ARFPD, continuous Class-F PA, and BPCA in the 3–4GHz frequency range were fabricated and tested. The test results show that the ARFPD has an insertion loss of 3.8 dB, an input return loss of better than 11.6 dB across all frequency band (0–7 GHz),and an isolation and output return loss (ORL) of better than 18 dB within the band. The BPCA has achieved input and ORL better than 10 dB up to 8GHz, a maximum DE of 55.7%, a maximum ${P} _{\text {out}}$ of 28.2 dBm, as well as a harmonic suppression level of 33dBc up to the tenth-harmonic frequency.