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http://dx.doi.org/10.5515/KJKIEES.2010.21.1.061

Size Reduction of a Quasi Class-E High Power Amplifier Using Defected Ground Structure  

Choi, Heung-Jae (Dept. of Info. & Comm. Engineering, Chonbuk National University)
Jeong, Yong-Chae (Dept. of Info. & Comm. Engineering, Chonbuk National University)
Lim, Jong-Sik (Dept. of Electric and Comm. Engineering, Soonchunhyang University)
Jung, Young-Bae (Antenna Technology Research Team, Electronics and Telecommunications Research Institute(ETRI))
Eom, Soon-Young (Antenna Technology Research Team, Electronics and Telecommunications Research Institute(ETRI))
Kim, Chul-Dong (Sewon Teletech, Inc.)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.1, 2010 , pp. 61-68 More about this Journal
Abstract
In this work, a reduced size 20W quasi class-E Power Amplifier(PA) with defected ground structure load-network is presented for WCDMA base station application. Harmonic impedances required for the class E operation are satisfied by applying the dumbbell and the asymmetric spiral DGS. Open impedance for 2nd harmonic frequency which has the highest power and nearly short impedances for other higher order harmonics are provided by the proposed DGS load-network. The maximum Power Added Efficiency(PAE) of 70.2 % at the output power of 43.1 dBm with the saturated power gain of 12.7 dB is achieved by the proposed quasi class-E PA, which is comparable to the performance of the reference class-E PA. Total size of the proposed class-E PA is only $50{\times}50\;mm^2$ and much smaller than the conventional class-E PA that is loaded with a number of open stubs.
Keywords
Class-E; Power Amplifier; Defected Ground Structure;
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