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A simple and effective broadband decoupling structure for UWB-MIMO antenna

Published online by Cambridge University Press:  17 December 2021

Huiqing Zhai Open the ORCID record for Huiqing Zhai [Opens in a new window] ,
Kunming Zhang ,
Yu Huo  and
Chaozong Guo
Huiqing Zhai*
Affiliation:
National Key Laboratory of Antennas and Microwave Technology, School of Electronic Engineering, Xidian University, Xi'an, Shaanxi 710071, China
Kunming Zhang
Affiliation:
National Key Laboratory of Antennas and Microwave Technology, School of Electronic Engineering, Xidian University, Xi'an, Shaanxi 710071, China
Yu Huo
Affiliation:
National Key Laboratory of Antennas and Microwave Technology, School of Electronic Engineering, Xidian University, Xi'an, Shaanxi 710071, China
Chaozong Guo
Affiliation:
National Key Laboratory of Antennas and Microwave Technology, School of Electronic Engineering, Xidian University, Xi'an, Shaanxi 710071, China
*
Author for correspondence: Huiqing Zhai, E-mail: [email protected]
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Abstract

A new type of closed square ring decoupling structure is proposed in this letter, which can effectively reduce the coupling of antennas. The designed antenna is composed of two elliptical monopoles and a common ground loaded with a broadband parasitic decoupling structure. Considering the impedance matching, each antenna element is changed from the original rectangular microstrip feed to a tapered microstrip feed and etched a circular slot on the elliptical monopole patch. By comparison with the original antenna without any decoupling structure, through loading the broadband decoupling structure on the ground, the antenna isolation is improved by 10 dB in most frequency bands. Comparing simulation and measurement results, the antenna achieves better than 25 dB isolation over the whole operating band (3.3–12 GHz). By manufacturing and testing the antenna designed in this article, the excellent performance parameters obtained also prove that the antenna can be used in portable devices.

Keywords

Antennadecoupling structuremultiple-input multiple-output (MIMO)ultra-wideband (UWB)
Type
Antenna Design, Modelling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Issue 8 , October 2022 , pp. 1039 - 1044
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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