Series-Slot-Fed Circularly Polarized Multiple-Input-Multiple-Output Antenna Array Enabling Circular Polarization Diversity for 5G 28-GHz Indoor Applications

Ubaid Ullah; Muath Al-hasan; Ismail Mabrouk; Sławomir Kozieł

doi:10.1109/tap.2021.3066247

Series-Slot-Fed Circularly Polarized Multiple-Input-Multiple-Output Antenna Array Enabling Circular Polarization Diversity for 5G 28-GHz Indoor Applications

Abstract

In this paper, a four-element circularly polarized series-slot-fed multiple-input-multiple-output (MIMO) antenna array with circular polarization diversity is presented. The proposed design utilizes a combination of 45-degree inclined slots and a straight microstrip line feeding technique. The two antennas are designed to operate with the opposite sense of circular polarization (CP). CP is achieved by placing a patch of just about square dimensions on the top of the V-slot with orthogonal but unequal arms. The unequal arm of the slot degenerates the fundamental mode at a slightly different frequency with 90-degree phase difference occurring at the center frequency of each arm. Proper positioning of the patch on the top of the slot ensures excitation of CP. For realizing a MIMO antenna with different sense of polarization, both the slots and the patches are flipped with respect to the feedline. Following optimization at the full-wave level of description, the antenna is prototyped and validated experimentally. The realizable antenna footprint is 20 mm × 27.7 mm. The simulated and measured results indicate that the proposed antenna features a wide impedance bandwidth (|S11|<-10 dB) from 26.9 GHz to 30.7 GHz, 3 dB axial ratio bandwidth from 27.31 GHz to 29.65 GHz and the peak realized gain of 11.86 dBic. Moreover, it exhibits a low level of in-band isolation |S21|>-37 dB and almost negligible envelope correlation coefficient (ECC), less than 0.00025. The highly directional beams, high gain and compact size of the proposed antenna permit implementation of multiple antennas for indoor applications in the 28-GHz band.

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Authors (4)

Ubaid Ullah
- Al Ain University of Science and Technology
Muath Al-hasan
- Al Ain University of Science and Technology
Ismail Mabrouk
- Al Ain University of Science and Technology
Sławomir Kozieł prof. dr inż.

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Publication version: Accepted or Published Version
DOI:: Digital Object Identifier (open in new tab) 10.1109/TAP.2021.3066247
License: Copyright (2021 IEEE)

Keywords

MULTIPLE-INPUT-MULTIPLE-OUTPUT ANTENNA , CIRCULAR POLARIZATION , POLARIZATION DIVERSITY , 5G , SERIES ARRAY

Details

Category:: Articles
Type:: artykuły w czasopismach
Published in:: IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION no. 69, pages 5607 - 5616,
ISSN: 0018-926X
Language:: English
Publication year:: 2021
Bibliographic description:: Ullah U., Al-Hasan M., Mabrouk I., Kozieł S.: Series-Slot-Fed Circularly Polarized Multiple-Input-Multiple-Output Antenna Array Enabling Circular Polarization Diversity for 5G 28-GHz Indoor Applications// IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION -Vol. 69,iss. 9 (2021), s.5607-5616
DOI:: Digital Object Identifier (open in new tab) 10.1109/tap.2021.3066247
Verified by:: Gdańsk University of Technology