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Compact modified circular patch quad-band MIMO antenna with high isolation and low correlation

Published online by Cambridge University Press:  12 January 2016

Chithradevi Rajagopal ,
Nafiza Noorullakhan ,
Sreeja Balakrishnapillai Suseela  and
Radha Sankararajan
Chithradevi Rajagopal
Affiliation:
Department of ECE, SSN College of engineering, Chennai, India. Phone: 09790915273
Nafiza Noorullakhan
Affiliation:
Department of ECE, SSN College of engineering, Chennai, India. Phone: 09790915273
Sreeja Balakrishnapillai Suseela*
Affiliation:
Department of ECE, SSN College of engineering, Chennai, India. Phone: 09790915273
Radha Sankararajan
Affiliation:
Department of ECE, SSN College of engineering, Chennai, India. Phone: 09790915273
*
Corresponding author:B. S. Sreeja Email: sreejabs@ssn.edu.in
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Abstract

A compact quad band slot antenna with high isolation suitable for multiple-input–multiple-output (MIMO) applications is developed. The quad bands are achieved by introducing slots in a modified, size reduced circular patch antenna. The single-antenna element consists of a substrate sandwiched between a modified circular patch with F shape slot, a feeder line and a via running between the radiating patch and the feeder line. The proposed design resonates at the frequencies of 1.8 GHz (1.7–1.88 GHz), 3.6 GHz (3.50–3.76 GHz), 5.4 GHz (5.25–5.38 GHz), and 7.2 GHz (7.15–7.35 GHz) covering the GSM II, WIMAX, wireless local area network (WLAN), and C-band applications, respectively. The independent tuning of frequency bands is achieved by varying the length of the slots. Orthogonally placed two- and four-element MIMO antenna system are fabricated, tested, and the measurement results are presented. The separation between each element is reduced to 0.085λ while introducing slotted and pulsed stubs to improve isolation between elements. A detailed analysis, including mutual coupling, low correlation, diversity gain, and total array reflection coefficient had been reported. The two- and four-element MIMO antennas achieved correlation as low as 0.005, mutual coupling ≤−15 dB, and diversity gain nearly 10 dB.

Keywords

CorrelationDiversity gainGSM IIWIMAXWLANC-bandHigh isolationMIMO antenna systemMutual couplingOrthogonal elementsQuad-band slot antennaTARC
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 3 , April 2017 , pp. 581 - 590
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

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References

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