UDC 621.375.122:537.86.42

Inverse class-f power amplifier using slot resonators as a harmonic filter

Rassokhina Yu. V., Krizhanovski V. G., Kovalenko V. A., Colantonio P., Giofre R.

Keywords: power amplifiers, class F, inverse class F, microstrip line, slot resonator.

The authors proposed and experimentally verified the power amplifier circuit of inverse class F (F–1) based on GaN transistor NPTB00004, operating at 1,7 GHz. The novelty of this scheme is the application of a three-layer structure based on slot rectangular shaped resonators in the ground plane of the microstrip transmission line as a filter of higher harmonics. To control the levels of the second and third harmonics in the output signal spectrum and simultaneously to match the 50 ohm load at the operating frequency of the amplifier, a planar periodic structure is used, consisting of two slot resonators of different lengths. Power added efficiency for experimental model of the amplifier is 60% at an output power of 3.9 W and a gain factor of 13 dB.

Ukraine, Donetsk National University; Italy, University of Rome Tor Vergata.