A Miniaturized Extremely Close-Spaced Four-Element Dual-Band MIMO Antenna System With Polarization and Pattern Diversity

We propose a miniaturized design of a four-element dual-band multiple-input-multiple-output (MIMO) antenna system. The dual-band function is obtained by etching an "L" slot in the radiating patch. The edge-to-edge elements spacing is only 0.023λ 0 . A decoupling structure consisting of cro...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters Vol. 17; no. 1; pp. 134 - 137
Main Authors: Boukarkar, Abdelheq, Lin, Xian Qi, Jiang, Yuan, Nie, Li Ying, Mei, Peng, Yu, Yi Qiang
Format: Journal Article
Language:English
Published: IEEE 01.01.2018
Subjects:
Antenna measurements
Antenna radiation patterns
Decoupling structure
Dual band
dual-band antenna
Metals
MIMO
multiple-input–multiple-output (MIMO)
mutual coupling
Scattering parameters
ISSN:1536-1225, 1548-5757
Online Access:Get full text
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Summary:We propose a miniaturized design of a four-element dual-band multiple-input-multiple-output (MIMO) antenna system. The dual-band function is obtained by etching an "L" slot in the radiating patch. The edge-to-edge elements spacing is only 0.023λ 0 . A decoupling structure consisting of cross-shaped metal strips shorted to the ground plane using vias is first introduced. Then, metalized walls are used to enhance the isolation level by realizing the pattern diversity. The measured resonant frequencies are centered at 3.5 and 5.7 GHz with bandwidths of 58 and 43 MHz, peak gains of 2.7 and 2.85 dBi, and peak efficiencies of 63% and 65%, respectively. A considerable measured mutual coupling reduction of 10.8 dB in the lower band and 15.6 dB in the upper band is realized. The overall size of the design is 0.41λ 0 × 0.41λ 0 × 0.04λ 0 with minimum isolation levels of 18.4 and 22.7 dB in the lower and upper bands, respectively. The envelope correlation coefficient is lower than 0.08 across both operating bandwidths. The measured results validate the good diversity performance of the MIMO system.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2017.2777839