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Pattern diversity and isolation enhancement of UWB MIMO antenna based on characteristic modes for mobile terminals

Published online by Cambridge University Press:  05 July 2022

Shailesh Jayant ,
Garima Srivastava Open the ORCID record for Garima Srivastava [Opens in a new window]  and
Sachin Kumar Open the ORCID record for Sachin Kumar [Opens in a new window]
Shailesh Jayant
Affiliation:
Guru Gobind Singh Indraprastha University, Delhi, 110078, India Department of Electronics and Communication Engineering, Ambedkar Institute of Advanced Communication Technologies and Research, Geeta Colony, Delhi, 110031, India
Garima Srivastava*
Affiliation:
Department of Electronics and Communication Engineering, Netaji Subhas University of Technology, Geeta Colony, Delhi, 110031, India
Sachin Kumar
Affiliation:
Department of Electronics & Communication Engineering, SRM Institute of Science and Technology, Chennai, 603203, India
*
Author for correspondence: Garima Srivastava;, E-mail: garima.shrivastav@gmail.com
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Abstract

A printed ultra-wideband (UWB) multiple input multiple output antenna with isolation enhancement and pattern diversity is presented, which is based on characteristic modes (CM) for upcoming wireless mobile platforms. The presented antenna is composed of dual UWB antenna elements (AEs) – an antipodal Vivaldi and a circular-shaped monopole positioned on the two opposite edges of the antenna's rectangular-shaped ground surface. The two AEs are capable to stimulate distinct modes in the ground surface and therefore obtaining the required distinct radiation (far-field) patterns and highly isolated AEs without introducing any decoupling structure (DS). The measured results demonstrate that both AEs are UWB with an operating frequency from 2.6 to 11 GHz. The measured isolation is more than 30.1 dB with a maximum value of 55 dB in UWB. The peak realized gain is over 0.83 dBi. The radiation efficiency is greater than 75%. The Envelope Correlation Coefficient is <0.08.

Keywords

UWBMIMOECCCharacteristic ModesVivaldi Antenna
Type
EM Field Theory
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 5 , June 2023 , pp. 793 - 804
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Copyright
© The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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