PBG Structure as Amplifier Out...

PBG Structure as Amplifier Output Network Chapter 4 PBG STRUCTURE AS AMPLIFIER OUTPUT NETWORK

1.

DESIGN CONCEPT

Producing the short circuit at even and the open circuit at the odd harmonics to the active device output (class F operation) can substantially increase efficiency of power amplifier29,30. With such a harmonic tuning, the voltage across active device output and current through it do not contain harmonics of the same order simultaneously. Practically, it is very difficult to control impedances for infinite number of harmonics, so usually the socalled Third-harmonic Peaking tuning is used. In this case the input impedance of output network is controlled up to the third harmonic. Increase in the number of higher harmonics taken into account leads to noticeable efficiency increase. Recently, photonic band-gap (PBG) and de