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400 W broadband power amplifier using transmission-line transformers with 1:8 impedance transformation ratio

Author

Listed:
  • H. Lee
  • I. Jung
  • M. Seo
  • H. Kim
  • J. Ham
  • J. Gu
  • Y. Yang

Abstract

This paper presents a broadband high-power amplifier using transmission-line transformers with a high impedance transformation ratio. Two series-connected transformers with 1:8 and 1:1 impedance transformation ratios are used at the load network of a single-balanced high-power amplifier to match the low load impedance in broadband. The same transformer configuration is also used at the input network. A negative feedback is applied to improve the gain flatness and to increase the stability over the broadband. In order to validate the proposed circuit structure, a broadband high-power amplifier is designed and implemented to achieve an output power of more than 400 W in the frequency band of 30 to 500 MHz. The implemented power amplifier exhibits a flat gain response within 1.80 dB at an average of 19.1 dB and high power-added efficiencies of 28.0 to 56.9 at an output power of 400 W over the entire frequency band.

Suggested Citation

  • H. Lee & I. Jung & M. Seo & H. Kim & J. Ham & J. Gu & Y. Yang, 2013. "400 W broadband power amplifier using transmission-line transformers with 1:8 impedance transformation ratio," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 27(11), pages 1429-1438, July.
    • Handle: RePEc:taf:tewaxx:v:27:y:2013:i:11:p:1429-1438
    DOI: 10.1080/09205071.2013.811122
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