Design of miniaturized high efficiency power amplifier based on harmonic suppression

Abstract

To overcome conventional VHF power amplifiers′ shortcomings of bulky size, low efficiency, and EM interferences due to output harmonics, a miniaturized, high power and high efficiency power amplifier working in VHF band is designed by using lumped parameter elements in this paper. In this work, multiple series LC resonators are introduced into the output matching circuit of the power amplifier, with effectively suppressed harmonic components, improved linearity and efficiency, as well as improved electromagnetic compatibility of the power amplifier. Finally, the physical test results show that the saturated output power of the power amplifier is about 44.9 dBm, the saturated power gain is 14 dB, and the power added efficiency is 62%. With its excellent performance, it has good practical engineering application value and can be widely used in aviation, aerospace and other fields.

Keywords

• power amplifier
• harmonic suppression
• high efficiency
• miniaturization
• vhf band