Miniature dual-band quadrature coupler with arbitrary power division ratios over the two bands

Yo Shen Lin, Chen Yun Lin

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

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.

Original languageEnglish
Article number8907823
Pages (from-to)634-646
Number of pages13
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume67
Issue number2
DOIs
StatePublished - Feb 2020

Keywords

  • Bridged-T coil
  • branch-line coupler
  • dual-band

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