Co-Design of highly efficient power amplifier and high-Q output bandpass filter

Kenle Chen, Juseop Lee, William J. Chappell, Dimitrios Peroulis

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


This paper reports the first co-design configuration of a power amplifier (PA) in cascade with a high-Q bandpass filter. By matching the filter's input port directly to the transistor's drain node, the conventional output matching network (OMN) of a PA is entirely eliminated. This leads to smaller size/volume, minimized loss, and enhanced overall performance. To enable this co-design method, the matching-filter synthesis theory is proposed and investigated in detail in this paper. Based on this theory, a 3% bandwidth (centered at 3.03 GHz) two-pole filter, implemented using high-Q evanescent-mode cavity resonators, is designed as the PA OMN to provide optimized fundamental and harmonic impedances for a commercial 10-W GaN transistor. Simulation and measured results show that the co-designed PA-filter module yields a desired Chybeshev filter behavior while maintaining excellent PA performance in the passband with 72% efficiency, 10-W output power, > 10-dB gain, and 60-dBm output third-order intercept point. This co-designed module experimentally presents a 8% higher overall efficiency compared to a control group developed using a conventional independent PA and filter, which further validates the effectiveness of this method.

Original languageEnglish
Article number6628000
Pages (from-to)3940-3950
Number of pages11
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number11
Publication statusPublished - 2013


  • Co-design
  • GaN
  • efficiency
  • evanescent-mode (EVA) cavity
  • filter
  • matching network
  • power amplifier (PA)
  • quality factor
  • resonator
  • synthesis

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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