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Implementation of Broadband Isolator Using Metamaterial-Inspired Resonators and a T-Shaped Branch for MIMO Antennas

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3 Author(s)
Chih-Chun Hsu ; Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan ; Ken-Huang Lin ; Hsin-Lung Su

We develop a novel MIMO antenna with excellent broadband isolation performance in this communication. Metamaterial (MTM)-inspired resonators can function as insulators and are placed periodically into a compact MIMO antenna system for portable applications. These insulators only need a 0.18 wavelength. The broadband insulators can efficiently reduce the coupling of MIMO antennas. Isolation bandwidth under 20 dB can reach 8% with relative to the center frequency. Adding a T-shaped branch behind the insulators markedly improves the isolation bandwidth. An isolation bandwidth under 20 dB can achieve 19.3% relative to the center frequency. The effectiveness of the proposed insulators is validated by measurements.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:59 ,  Issue: 10 )