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Introduction of the orthogonal mode via the polarization conversion parasitic structure for the isolation enhancement of MIMO patch antennas

Published online by Cambridge University Press:  26 April 2024

Zhonghong Du ,
Xiaohui Zhang ,
Peiyu Qin ,
Yurong Pu  and
Xiaoli Xi Open the ORCID record for Xiaoli Xi [Opens in a new window]
Zhonghong Du
Affiliation:
The Faculty of Automation and Information Engineering, Xi’an University of Technology, Xi’an, China
Xiaohui Zhang*
Affiliation:
The Faculty of Automation and Information Engineering, Xi’an University of Technology, Xi’an, China
Peiyu Qin
Affiliation:
The Faculty of Automation and Information Engineering, Xi’an University of Technology, Xi’an, China Department of Electronic and Electrical Engineering, Brunel University London, London, UK
Yurong Pu
Affiliation:
The Faculty of Automation and Information Engineering, Xi’an University of Technology, Xi’an, China
Xiaoli Xi
Affiliation:
The Faculty of Automation and Information Engineering, Xi’an University of Technology, Xi’an, China
*
Corresponding author: Xiaohui Zhang; Email: xhzhang@xaut.edu.cn
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Abstract

In this study, a high-isolation multiple-input multiple-output (MIMO) microstrip patch antenna (MPA), which utilizes an orthogonal mode cancellation method is proposed. This method employs TM10 and TM01 modes, which are simultaneously excited in the rectangular passive MPA. Initially, a rectangular decoupling structure featuring polarization rotation characteristics is designed. Further studies show that by loading the polarization conversion parasitic structure (PCPS), the electric field of the spatial coupling wave can be transformed from the x-polarized TM10 mode to the y-polarized TM01 mode. Therefore, TM10 and TM01 modes from the excited antenna and decoupling structure are concurrently coupled to the passive antenna, forming an evident weak-field region on the passive antenna. Placing the feeding probe of the passive MPA within the weak-field region prevents signal reception at the port. Consequently, this results in an extremely low mutual coupling of −49 dB at a resonant frequency of 5.8 GHz. Finally, a prototype of the proposed antenna is fabricated and tested, and the measured results closely match the simulated results. Additionally, it is observed that PCPS slightly influences the performance of the MIMO antenna.

Keywords

isolation enhancementMIMO antennapolarization conversionweak-field region construction
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 9
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Copyright
© The Author(s), 2024. Published by Cambridge University Press in association with The European Microwave Association.

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