Switchless matching networks for dual-band class-E power amplifiers

This paper presents two different switchless (concurrent) dual-band load networks for class E power amplifier at 800 MHz and 1.9 GHz for 4G LTE standards. The two presented load structures, the all-lumped element and the transformer-based structure not only provide optimal impedance at both fundamental frequencies but also present high impedance up to their 3rd harmonics. Simulated PAEs for the all-lumped element and the transformer-based load network are above 62% and 57% with output powers of 26.5 dBm at 800 MHz and 1.9 GHz, respectively.