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Open AccessFeature PaperArticle

Ultra-Compact Reconfigurable Band Reject UWB MIMO Antenna with Four Radiators

1
Department Electrical and Computer Engineering, COMSATS University Islamabad, Islamabad 45550, Pakistan
2
Research Laboratory of Electronics, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
3
Department of Electrical and Computer Engineering, New York University, Abu Dhabi 129188, UAE
4
Department of Information Engineering, University of Padova, Via Gradenigo 6/b, 35131 Padova, Italy
5
Electronic and Electrical Engineering, The University of Sheffield, Sheffield S1 4ET, UK
6
Department of Electrical and Computer Engineering, North Dakota State University, Fargo, ND 58102, USA
7
Department of Electrical Engineering, Heriot-Watt University, Edinburgh EH14 4AS, UK
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Electronics 2020, 9(4), 584; https://doi.org/10.3390/electronics9040584
Received: 19 February 2020 / Revised: 20 March 2020 / Accepted: 23 March 2020 / Published: 30 March 2020
(This article belongs to the Special Issue Reconfigurable Antennas)
A compact reconfigurable UWB MIMO antenna with four radiators that accomplish on-demand band rejection from 4.9 to 6.3 GHz is presented. An LC stub is connected to the ground plane by activating the PIN diode for each radiator. Two radiators are placed perpendicular to each other to exploit the polarization diversity on a compact 25 × 50 mm 2 FR4 laminate. Two additional radiators are then fixed obliquely on the same laminate (without increasing size) in angular configuration at ±45 perpendicular to the first two planar radiators still exploiting polarization diversity. The design is validated by prototyping and comparing the results with the simulated ones. On demand band rejection through the use of PIN diodes, wide impedance matching (2–12 GHz), high isolation amongst the radiators, compactness achieved by angular placement of the radiators, low gain variation over the entire bandwidth, band rejection control achieved by adjusting the gap between stub and ground plane, and low TARC values makes the proposed design very suitable for commercial handheld devices (i.e., Huawei E5785 and Netgear 815S housings). The proposed configuration of the UWB MIMO radiators has been investigated first time as per authors’ knowledge. View Full-Text
Keywords: band rejected; envelope correlation co-efficient; four element MIMO; polarization diversity; ultra-wideband multiple input multiple output band rejected; envelope correlation co-efficient; four element MIMO; polarization diversity; ultra-wideband multiple input multiple output
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MDPI and ACS Style

Khan, M.S.; Iftikhar, A.; Shubair, R.M.; Capobianco, A.-D.; Asif, S.M.; Braaten, B.D.; Anagnostou, D.E. Ultra-Compact Reconfigurable Band Reject UWB MIMO Antenna with Four Radiators. Electronics 2020, 9, 584.

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