Compact wideband multi-section quarter-wave-like transformers

Thanatcha Satitchantrakul, Prayoot Akkaraekthalin, Rardchawadee Silapunt and Danai Torrungrueng

Journal of Electromagnetic Waves and Applications, 2018, vol. 32, issue 15, 1911-1924

Abstract: This paper proposes a novel design technique of the compact wideband transformer based on the quarter-wave-like transformer (QWLT) theory and the approximate theory of small reflections (ATSR). The ATSR for multi-section QWLTs is applied for analysing characteristics of multi-section QWLTs. The prototypes of two-section QWLTs operating at 2.4 GHz with 25% physical size reduction, comparing to that of the corresponding of wideband multi-section quarter-wave transformer (QWT), are implemented. It is found that measured results are matched reasonably well with results of the ATSR for multi-section QWLTs. In addition, the two-section QWLT prototypes provide slightly less bandwidth compared to that of the corresponding wideband multi-section QWT.

Date: 2018
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DOI: 10.1080/09205071.2018.1482239

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