A concurrent multi-band power amplifier with compact matching networks

This paper presents a novel configuration for a concurrent multi-band power amplifier (PA). A multi-band matching network comprises a multi-section impedance transformer that achieves matching in multiple bands. The proposed impedance transformer provides flexibility in the design of a concurrent multi-band PA in a wide frequency range. The impedance transformer is compact since each section comprises a combination of a T-shaped network, a shunt tank circuit, and a matching element. The proposed 1W-class dual-band PA achieves a maximum power added efficiency of greater than 53% at 0.8 GHz and 3.3 GHz.