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A compact SWB MIMO antenna with 45° clock-wise square patch inclusions for polarization diversity applications

Published online by Cambridge University Press:  11 April 2022

Shobit Agarwal ,
Ashwani Sharma Open the ORCID record for Ashwani Sharma [Opens in a new window] ,
Ignacio J. Garcia Zuazola  and
Manoj Kumar
Shobit Agarwal
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab, India
Ashwani Sharma*
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab, India
Ignacio J. Garcia Zuazola
Affiliation:
School of Computing and Digital Media, London Metropolitan University, 166-220 Holloway Rd, London N7 8DB, UK
Manoj Kumar
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab, India
*
Author for correspondence: Ashwani Sharma, E-mail: ashwani.sharma@iitrpr.ac.in
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Abstract

In this paper, a compact super wideband annular ring antenna using 45° clock-wise square patch inclusions for super high frequency and polarization diversity applications is proposed. The inclusions consist of a combination of squares and circles into one another in the inner area of a main annular ring radiator. The antenna uses a partial ground plane having a stair-type defected ground structure, is designed on an FR-4 substrate, and has a total size of 25 × 26 × 1.6 mm3 (0.17λ × 0.18λ). The design was fabricated and experimental results fairly agreed with simulations and resulted in an antenna with an operating frequency from 2.07 to 30 GHz; that is, a large fractional bandwidth of 174.2$\%$ with a bandwidth (BW) ratio of 14.5:1 and a high BW dimension ratio, BW per unit electrical length of 5693, and a measured peak gain of 8 dBi with an average gain of 5 dBi for the overall operating frequency. For the polarization diversity, a 4 × 4 multiple input-multiple output configuration is additionally presented, offering an effective isolation of ≥ 22.5 dB between ports and corroborated by measurements.

Keywords

Annular ring antennabandwidth dimension ratiodefected ground structuremultiple-input multiple-outputpolarization diversity
Type
Antenna Design, Modeling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 3 , April 2023 , pp. 513 - 525
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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