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Design and analysis of planar four-port UWB-MIMO antenna with band-rejection capability

Published online by Cambridge University Press:  15 June 2023

Harleen Kaur ,
Hari Shankar Singh Open the ORCID record for Hari Shankar Singh [Opens in a new window]  and
Rahul Upadhyay
Harleen Kaur
Affiliation:
Department of Electronics and Communication Engineering, Thapar Institute of Engineering and Technology, Patiala, India
Hari Shankar Singh*
Affiliation:
Department of Electronics and Communication Engineering, Thapar Institute of Engineering and Technology, Patiala, India TIET-VT Center of Excellence for Emerging Materials, TIET, Patiala, India
Rahul Upadhyay
Affiliation:
Department of Electronics and Communication Engineering, Thapar Institute of Engineering and Technology, Patiala, India
*
Corresponding author: Hari Shankar Singh; Email: harishankar1990@gmail.com
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Abstract

This manuscript presents a 50 Ω microstrip-fed quad-element high isolated ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna with band-notched characteristics. The overall area of the proposed structure is 0.33λo × 0.33λo mm2 (where λo depicts the free space wavelength corresponding to the lower cutoff frequency, i.e. 2.54 GHz), etched on an FR-4 substrate of thickness 0.8 mm. The top layer has four semicircular disc-shaped radiating elements that are identical and orthogonal to obtain better inter-element isolation and compactness. A reverse two-shaped slot is etched onto the radiating patches to attain a band-rejection capability. Moreover, a decoupling structure is also placed at the top layer to suppress the unwanted surface waves. The bottom layer consists of a ground plane, which is further modified with quasi-self complementary and meandered line slots. A rectangular slot is also etched below the feed line to better match the impedance near the lower cutoff frequencies. The simulated reflection coefficients (S11) of the proposed antenna are less than −10 dB over 2.54 to 10.74 GHz frequencies except at 3.37 to 4.15 GHz (WiMAX/C band), and the simulated inter-port isolation (S21) is greater than −15 dB over the entire UWB range of frequencies (3.1 to 10.6 GHz). Also, the measured S-parameter results well agreed with the simulated ones. Furthermore, the simulation study of the 20-element UWB-MIMO antenna is also investigated using the proposed quad-element structure.

Keywords

band-notchchannel capacity lossdiversity gainenvelop correlation coefficientsimpedance bandwidthmean effective gainmultiple-input multiple-outputmutual couplingultra-wideband
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 13
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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