Feedline Alterations for Optimization-Based Design of Compact Super-Wideband MIMO Antennas in Parallel Configuration

Muhammad ul Haq; Sławomir Kozieł

doi:10.1109/lawp.2019.2935783

Feedline Alterations for Optimization-Based Design of Compact Super-Wideband MIMO Antennas in Parallel Configuration

Abstract

This letter presents a technique for size reduction of wideband multiple-input-multiple-output (MIMO) antennas. Our approach is a two-stage procedure. At the first stage, the antenna structure is modified to improve its impedance matching. This is achieved through incorporation of an n-section tapered feedline, followed by reoptimization of geometry parameters. Reducing the maximum in-band reflection well beyond the acceptance level of -10 dB creates room for size reduction, realized in the second stage as explicit footprint area minimization with the constraints imposed on the maximum in-band reflection level (|S 11 | ≤ -10 dB) and element isolation (|Sε| ≤ -20 dB). The technique is generic and can be applied to various monopole-based MIMO structures. It is validated using two antenna structures operating from 2.8 to 20 GHz. Various complexities of the tapered lines are also investigated, from n = 1 to 5. To the best of the authors' knowledge, the obtained footprints (452 and 546 mm 2 , respectively) are the smallest to date while ensuring acceptable performance, specifically impedance matching, isolation, envelope correlation coefficient (<;0.005), and diversity gain (>9.99 dB).

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Authors (2)

Muhammad ul Haq Dr
- Reykjavik University Department of Engineering
Sławomir Kozieł prof. dr inż.

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Keywords

COMPACT ANTENNAS, ELECTROMAGNETIC (EM)-SIMULATION-DRIVEN DESIGN, ELEMENT ISOLATION, FEEDLINE ALTERATIONS,MULTIPLE-INPUT–MULTIPLE-OUTPUT (MIMO) ANTENNA

Details

Category:: Articles
Type:: artykuły w czasopismach
Published in:: IEEE Antennas and Wireless Propagation Letters no. 18, pages 1986 - 1990,
ISSN: 1536-1225
Language:: English
Publication year:: 2019
Bibliographic description:: Ul Haq M., Kozieł S.: Feedline Alterations for Optimization-Based Design of Compact Super-Wideband MIMO Antennas in Parallel Configuration// IEEE Antennas and Wireless Propagation Letters -Vol. 18,iss. 10 (2019), s.1986-1990
DOI:: Digital Object Identifier (open in new tab) 10.1109/lawp.2019.2935783
Verified by:: Gdańsk University of Technology