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Miniaturized Arbitrary Phase-Difference Couplers for Arbitrary Coupling Coefficients

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5 Author(s)
Yongle Wu ; School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China ; Jun-Yu Shen ; Yuanan Liu ; Sai-Wing Leung
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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.

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IEEE Transactions on Microwave Theory and Techniques  (Volume:61 ,  Issue: 6 )