RF power amplifier employing a frequency-tunable impedance matching network based on coupled inductors

Coupled inductors can be used as tunable inductances. Employing coupled inductors in the output impedance matching network of an RF power amplifier leads to superior performance when operating in more than one frequency band. As proof of this concept, the design of a dual-band RF power amplifier for the 200 and 300 MHz bands is presented. Simulation and measurement results validate the technique.