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Four-port flexible UWB-MIMO antenna with triple band-notched for wearable IoT applications

Published online by Cambridge University Press:  29 January 2025

Huanchen Peng ,
Chengzhu Du Open the ORCID record for Chengzhu Du [Opens in a new window]  and
Ruohui Wang
Huanchen Peng
Affiliation:
School of Electronics and Information Engineering, Shanghai University of Electric Power, Shanghai, People’s Republic of China
Chengzhu Du*
Affiliation:
School of Electronics and Information Engineering, Shanghai University of Electric Power, Shanghai, People’s Republic of China
Ruohui Wang
Affiliation:
School of Electronics and Information Engineering, Shanghai University of Electric Power, Shanghai, People’s Republic of China
*
Corresponding author: Chengzhu Du; Email: duchengzhu@163.com
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Abstract

A four-port ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna with three notch bands is proposed in this work. The antenna uses ultra-thin flexible material liquid crystal polymer (LCP) as the substrate. Four identical monopole radiators are designed in this proposed antenna system. The notch bands of the antenna are generated by adding complementary split ring resonator (CSRR) and ring branch. A cross-shaped stub is set in the center of the four antenna units to enhance the isolation. The measured bandwidth of the antenna is 2.54–10.69 GHz, filtering out three notch frequency bands of 2.81–3.85, 5.11–5.98, and 7.34–8.69 GHz. The isolation in the entire working frequency is better than 22 dB. The bent performances of the MIMO system and the specific absorption rate (SAR) value are analyzed. The low SAR values, low envelope correlation coefficient (<0.05), high diversity gain (>9.999), and stable gain of the proposed antenna indicate that in UWB-MIMO systems and wearable Internet of Things applications, it can be widely used.

Keywords

band notchflexible antennaIoTliquid crystal polymer (LCP)MIMOultra-wideband (UWB)
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 11
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association

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