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High-efficiency inverse class-F power amplifier using 3/4 spiral symmetric defected ground structure

Published online by Cambridge University Press:  01 July 2011

Shilei Jin ,
Jianyi Zhou  and
Lei Zhang
Shilei Jin*
Affiliation:
Department of Radio Engineering, School of Information Science and Engineering, Southeast University, Liwenzheng Lou, North Room 633, Nanjing 210096, China
Jianyi Zhou
Affiliation:
Department of Radio Engineering, School of Information Science and Engineering, Southeast University, Liwenzheng Lou, North Room 633, Nanjing 210096, China
Lei Zhang
Affiliation:
Department of Radio Engineering, School of Information Science and Engineering, Southeast University, Liwenzheng Lou, North Room 633, Nanjing 210096, China
*
Corresponding author: S. Jin Email: jinshilei@gmail.com
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Abstract

In this article, the development of a high-efficiency power amplifier (PA) with the inverse class-F configuration and a novel 3/4 spiral defected ground structure (DGS) is presented. The proposed DGS structure has improved rejection characteristic and its resonance frequencies are more convenient to adjust than conventional symmetric and asymmetric spiral structure. The electromagnetic-simulated result shows that the proposed circuit has improved harmonic control performance with simplified structure and less return loss than the conventional microstrip harmonic control circuit. The 3/4 spiral harmonics control circuit (HCC) can be modeled by three parallel RLC resonators. Using the proposed structure a high-performance harmonic control circuit is designed for implementing an inverse class-F PA. For comparison, two inverse class-F PAs operating at 2.4 GHz have been implemented by the microstrip HCC and the proposed HCC, respectively. According to the experiment results, the size of the proposed inverse class-F PA is reduced by 20%, the power-added efficiency and the gain are increased by 4.8% and 1.5 dB, respectively.

Keywords

3/4 Spiral defected ground structure (DGS)Harmonic control circuit (HCC)Inverse class-F PAPower-added efficiency (PAE)
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 3 , Issue 6 , December 2011 , pp. 621 - 625
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2011

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