A compact wideband parallelstrip 180° hybrid coupler
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
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Pages (from-to) | 3271-3274 |
Journal / Publication | Microwave and Optical Technology Letters |
Volume | 50 |
Issue number | 12 |
Publication status | Published - Dec 2008 |
Link(s)
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.
In: Microwave and Optical Technology Letters, Vol. 50, No. 12, 12.2008, p. 3271-3274.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review