Window-shaped mmWave MIMO antenna for 5G devices using characteristics mode analysis

Dalarsson, Mariana and Kiani, Saad Hassan and Mohd Ibrahim, Imran and Shariff B. G., Parveez and Ali, Tanweer and Khan, Muhammad Abbas and Elmannai, Hela and Algarni, Abeer D. (2026) Window-shaped mmWave MIMO antenna for 5G devices using characteristics mode analysis. International Journal of Antennas and Propagation, 2026 (1). pp. 1-14. ISSN 1687-5869

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Abstract

A compact four-element mmWave MIMO antenna designed using characteristics mode analysis (CMA) with wideband performance and high isolation is presented. The antenna is realized on a 0.254-mm Rogers RO5880 substrate with meandered conductive strips arranged in a window-shaped configuration and a partially truncated ground-plane notch. CMA is employed to observe the modal behavior of the structure, revealing that Mode 1 is the dominant radiating mode, while Modes 2 and 3 contribute to resonance formation and bandwidth enhancement. The single antenna element occupies a compact size of 12 × 14 mm2 (0.1305 λ0 × 0.1119 λ0, where λ0 is the wavelength at 28 GHz), whereas the four-port MIMO configuration measures 24 × 32 mm2 (0.224 λ0 × 0.229 λ0). A decoupling structure is introduced to suppress mutual coupling, achieving interelement isolation better than 20 dB. The proposed MIMO antenna operates over a wide impedance bandwidth from 24.5 to 33.5 GHz and exhibits a peak realized gain of 6.2 dBi. Due to its symmetric layout, the design is inherently scalable to higher order MIMO systems. Experimental results obtained from a fabricated prototype show good agreement with simulations, validating key MIMO performance metrics, including ECC, MEG, CCL, and DG, confirming the suitability of the proposed antenna for mmWave RF applications.

Item Type:	Article
Uncontrolled Keywords:	5G, MIMO system, mmWave, Pattern diversity
Divisions:	Faculty Of Electronics And Computer Technology And Engineering
Depositing User:	Sabariah Ismail
Date Deposited:	20 Jul 2026 07:14
Last Modified:	20 Jul 2026 07:14
URI:	http://eprints.utem.edu.my/id/eprint/30031
Statistic Details:	View Download Statistic

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