A Study on the Improvement of the Performance of Power Amplifiers by Deflected Ground Structure

Lim, Jong-Sik; Lee, Young-Taek; Han, Jae-Hee; Nam, Sang-wook; Park, Jun-Seok; Ahn, Dal; Kim, Byung-Sung

Journal of the Korean Institute of Electromagnetic and Science 2001;1(2):146-155.

Jong-Sik Lim¹, Young-Taek Lee¹, Jae-Hee Han¹, Sang-wook Nam¹, Jun-Seok Park², Dal Ahn², Byung-Sung Kim³

¹School of Electrical Engineering, Seoul National University
²Division of Information Technology Engineering, SoonChunHyang University
³School of Electrical and Computer Engineering, SungKyunKwan University

Abstract

This paper describes the improvement in performance of power amplifiers by Defected Ground Structure (DGS) for several operating classes. Due to its excellent capability of harmonic rejection, DGS plays a threat role in improving the main performance of power amplifiers such as output power, power added efficiency, harmonic rejection, and intermodulation distortion (IMD3). In order to verify the improvement in performance of power amplifiers by DGS, measured data for a 30 Watts power amplifier with and without DGS attached under several operating classes are illustrated and compared. The principle of the performance improvement is described with simple Volterra nonlinear transfer functions. Also, the measured performance far two cases, i.e. with and without DGS, and the quantities of improvement fur the various operating classes are compared and discussed.