Miniature Dual-Band Quadrature Coupler With Arbitrary Power Division Ratios Over the Two Bands

In this article, the design of miniature dual-band quadrature coupler that is capable of achieving arbitrary power division ratios over the two bands is presented. By employing the dual-band design of bridged-T coils, the proposed dual-band quadrature coupler features a very compact circuit size, an...

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Bibliographic Details
Published inIEEE transactions on circuits and systems. I, Regular papers Vol. 67; no. 2; pp. 634 - 646
Main Authors Lin, Yo-Shen, Lin, Chen-Yun
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
branch-line coupler
Bridged-T coil
Circuits
Coils
Couplers
Dual band
Employment
Frequency conversion
Quadratures
Resonant frequency
Transmission lines
Wideband
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Summary:In this article, the design of miniature dual-band quadrature coupler that is capable of achieving arbitrary power division ratios over the two bands is presented. By employing the dual-band design of bridged-T coils, the proposed dual-band quadrature coupler features a very compact circuit size, and its power division ratio for each band can be designed with the desired value. Explicit design equations are given and practical limitations on the achievable frequency ratio and power division ratio are investigated in detail. As design examples, two 2.45/5.5-GHz dual-band quadrature couplers, one with 0/3-dB and the other with 3/3-dB power division ratios for the two bands are implemented in a commercial GaAs pHEMT process. Very compact circuit sizes of less than 2.2 mm × 1.3 mm are achieved. To the best of our knowledge, these are the smallest dual-band quadrature coupler ever reported.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2019.2950910