@inproceedings{71a317202b5a4869847a0a266f09ae83,
title = "A compact dual-band metamaterial-based rat-race coupler for a MIMO system application",
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.",
keywords = "Composite right/left-handed (CRLH) transmission lines (TLs), Dual-band, MIMO systems, Miniaturization, Pattern diversity, Rat-race couplers",
author = "Pei-Ling Chi and Lee, {Cheng Jung} and Tatsuo Itoh",
year = "2008",
month = dec,
day = "12",
doi = "10.1109/MWSYM.2008.4632920",
language = "English",
isbn = "9781424417810",
series = "IEEE MTT-S International Microwave Symposium Digest",
pages = "667--670",
booktitle = "2008 IEEE MTT-S International Microwave Symposium Digest, MTT",
note = "null ; Conference date: 15-06-2008 Through 20-06-2008",
}