Miniaturized arbitrary phase-difference couplers for arbitrary coupling coefficients

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Original languageEnglish
Article number6515706
Pages (from-to)2317-2324
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Issue number6
Online published16 May 2013
Publication statusPublished - Jun 2013


In this paper, a planar miniaturized arbitrary phase-difference coupler with arbitrary coupling coefficients is proposed. The proposed coupler consists of three coupled-line sections which achieves a compact circuit layout in microstrip implementation. The circuit parameters of this novel coupler can be easily determined by the derived closed-form equations and the corresponding performance analysis in terms of the bandwidth and miniaturization requirement is provided. Two prototypes with this proposed structure, operating at 2 GHz, have been designed and implemented using microstrip technology. One has a 45° phase difference with-3-dB coupling coefficient and the other demonstrates a 60° phase difference with-4.77-dB coupling coefficient. In addition, over 20% fractional bandwidth, which is defined as 5° phase error and 0.5-dB magnitude imbalance, is obtained in both of the two prototypes. © 1963-2012 IEEE.

Research Area(s)

  • Arbitrary phase difference, arbitrary power division, compact structure, coupled-line couplers, coupling coefficient

Citation Format(s)