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Dual circularly polarized multilayer MIMO antenna array with an enhanced SR-feeding network for C-band application

Published online by Cambridge University Press:  03 May 2017

Mahdi Jalali ,
Mohammad Naser-Moghadasi  and
Ramezan Ali Sadeghzadeh
Mahdi Jalali
Affiliation:
Faculty of Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Mohammad Naser-Moghadasi*
Affiliation:
Faculty of Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Ramezan Ali Sadeghzadeh
Affiliation:
Faculty of Electrical and Computer Engineering, K. N. Toosi University of Technology, Tehran, Iran
*
Corresponding author: M. Naser-Moghadasi Email: mn.moghaddasi@srbiau.ac.ir
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Abstract

Wide-band circularly polarized multi-input multi-output (MIMO) antenna array with a 2 × 4 feed network was proposed for C-band application. Different unique techniques were utilized in the proposed array to enhance the antenna characteristics, such as gain, 3 dB axial ratio bandwidth (ARBW), impedance tuning, and ruinous mutual coupling effects. A miniaturized dual-feed Tai chi-shaped antenna element with a pair of feeding points and a pair of eyebrow-shaped strips was presented for enhancing circular polarization (CP) purity and impedance matching. For a better improvement of CP features, a 2*4 MIMO sequentially rotated (MIMO-SR) feed network was used to achieve broader 3 dB ARBW. Besides, the MIMO feature of the feed network could control the left- and right-handed CP, respectively. Ultimately, specific forms of slot and slit structures were applied onto the top layer of MIMO feed network that provided a high isolation between the radiating elements and array network. Furthermore, the diversity gain (DG) was studied. The extracted measured results illustrated an impedance bandwidth of 3.5–8.2 GHz at port 1 and 3.5–8.3 GHz at port 2 for VWSR < 2 and 3 dB ARBW of 4.6–7.6 GHz at port 1 and 4.6–7.5 GHz at port 2. The peak gain of 9.9 dBi was at 6 GHz.

Keywords

AntennaBroad bandCircular polarizationMicrostripMulti-input multi-output (MIMO) networks
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Special Issue 8: Biomedical Applications of RF/Microwave and Optics Technologies , October 2017 , pp. 1741 - 1748
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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