A compact wideband parallelstrip 180° hybrid coupler

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

12 Scopus Citations
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Detail(s)

Original languageEnglish
Pages (from-to)3271-3274
Journal / PublicationMicrowave and Optical Technology Letters
Volume50
Issue number12
Publication statusPublished - Dec 2008

Abstract

In this study, a wideband compact parallel-strip 180° hybrid coupler with the center frequency of 2 GHz is presented. By replacing the 270° section in the 180° hybrid coupler with a parallel-strip phase reversal swap, the total circuit size is reduced by half. In this structure, the phase gradients of the four arms of the coupler are equalized; therefore, the operation bandwidth is dramatically enhanced. S-parameters of the coupler are simulated and measured with good agreement. As predicted from the measured data, the bandwidth of the 90% combining efficiency is increased from 45 to 124%. The proposed design achieves more than -25 dB signal suppression within the whole measured frequency range (0-4 GHz) as opposed to 1.8 to 2.2 GHz of the conventional design. The proposed 180° hybrid coupler can serve as a wideband in-phase/differential power divider/combiner, which are essential for many RF and microwave subsystem designs. © 2008 Wiley Periodicals, Inc.

Research Area(s)

  • 180° hybrid coupler, Bandwidth enhancement, Parallel-strip line, Size reduction

Citation Format(s)

A compact wideband parallelstrip 180° hybrid coupler. / Chiu, L.; Xue, Q.; Chan, C. H.
In: Microwave and Optical Technology Letters, Vol. 50, No. 12, 12.2008, p. 3271-3274.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review