Efficiency enchancement of Class-E power amplifier in VHF radio frequency spectrum for land mobile radio system

Abstract

Land Mobile Radios (LMR) are used by various emergency organizations such as military, fire and ambulance services. The main function of LMR is to transmit voice over a selective range of radio frequency and they are mostly battery operated. Power amplifier (PA) circuit of LMR has drawn a major concern from engineers because they consume enormous power from battery. More research is conducted on PA to find solutions for improving Power Added Efficiency (PAE). PAE represents a figure of merit that economically shows how efficiently the PA converts RF power to DC power. With PAE parameter increased the device can be able to produce output the same amount of power with less DC power consumed. Class-E power amplifier desires the most attention among different classes of PA from engineers because of their ability of providing high PAE and more harmonic suppression. In this paper, Advance Design System (ADS) software is used for designing and simulation. Class-E PA is designed, harmonics are suppressed at the output. The final design operates at the frequency range of 136-174MHz with PAE of 92.39% by delivering 28.75dBm output power and the effectiveness of Class-E PA is boosted to suppress second order harmonics by 91.675dBc.