Bandpass Class-F Power Amplifier Based on Multifunction Hybrid Cavity-Microstrip Filter

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Qing-Yi Guo
  • Xiu Yin Zhang
  • Jin-Xu Xu
  • Yuan Chun Li
  • Quan Xue

Detail(s)

Original languageEnglish
Article number7544468
Pages (from-to)742-746
Journal / PublicationIEEE Transactions on Circuits and Systems II: Express Briefs
Volume64
Issue number7
Online published16 Aug 2016
Publication statusPublished - Jul 2017

Abstract

This brief presents a filter-integrated high-efficiency class-F power amplifier (PA). The hybrid cavity–microstrip filtering circuit is employed not only to realize output impedance matching and the third-harmonic manipulation but also to provide high-selectivity bandpass responses. To fulfill the requirements of high-efficiency class-F PAs, cavity resonators and microstrip feeding structures are involved, and their benefits are fully exploited. The metal cavity resonator features a high Q value and, thus, low loss in the passband, resulting in high efficiency. Moreover, metal walls of cavities act as heat sink for the transistor. The microstrip feeding structures are used to improve the skirt selectivity and manipulate the third harmonic. Moreover, it features easy integration with the transistor, and thus, the transition between cavity and microstrip lines is eliminated. The hybrid filter is characterized based on filter synthesis theory. Complex impedance conversion analysis is carried out to guide the impedance transformation from 50 Ω to a complex one desired by the transistor. For demonstration, a filtering PA operating at 2.4 GHz is designed and measured. It exhibits both high-selectivity bandpass responses and good PA performance with maximum power-added efficiency of 70.9% at 40.8-dBm output power.

Research Area(s)

  • Class-F power amplifier (PA), complex impedance conversion, high efficiency, hybrid cavity-microstrip bandpass filter (BPF)

Citation Format(s)

Bandpass Class-F Power Amplifier Based on Multifunction Hybrid Cavity-Microstrip Filter. / Guo, Qing-Yi; Zhang, Xiu Yin; Xu, Jin-Xu et al.

In: IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 64, No. 7, 7544468, 07.2017, p. 742-746.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review