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

H. Lee, I. Jung, M. Seo, H. Kim, J. Ham, J. Gu and Y. Yang

Journal of Electromagnetic Waves and Applications, 2013, vol. 27, issue 11, 1429-1438

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.

Date: 2013
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DOI: 10.1080/09205071.2013.811122

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