A compact dual-band metamaterial-based rat-race coupler for a MIMO system application

Pei-Ling Chi*, Cheng Jung Lee, Tatsuo Itoh

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

22 Scopus citations

Abstract

A compact dual-band rat-race coupler is proposed in this paper. By using composite right/left-handed (CRLH) transmission lines (TLs) and investigating all possible combinations of phase responses of the individual TLs in the coupler, a dual-band and miniaturized rat-race coupler was implemented. The dual-band rat-race coupler shows a 55% size reduction. This CRLH-based coupler is used as a mode-decoupling network in a dual-band front-end MIMO system, along with a planar antenna array, to split two orthogonal radiation modes from the connected array. A pair of compact dual-band antennas were built and closely spaced to demonstrate pattern diversity by in-phase or out-of-phase excitations from the coupler. Good experimental isolation of the system, -29 dB at 2.4 GHz and -34.2 dB at 5.2 GHz, is exhibited verifying the desired decoupling property. Furthermore, pattern diversity in MIMO communications was observed by two measured orthogonal radiation patterns.

Original languageEnglish
Title of host publication2008 IEEE MTT-S International Microwave Symposium Digest, MTT
Pages667-670
Number of pages4
DOIs
StatePublished - 12 Dec 2008
Event2008 IEEE MTT-S International Microwave Symposium Digest, MTT - Atlanta, GA, United States
Duration: 15 Jun 200820 Jun 2008

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X

Conference

Conference2008 IEEE MTT-S International Microwave Symposium Digest, MTT
CountryUnited States
CityAtlanta, GA
Period15/06/0820/06/08

Keywords

  • Composite right/left-handed (CRLH) transmission lines (TLs)
  • Dual-band
  • MIMO systems
  • Miniaturization
  • Pattern diversity
  • Rat-race couplers

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