Compact Quad-Port MIMO Antenna Employing Defected Substrate and Ground Plane for Sub-6 GHz 5G Communication

Perli, Bhaskara Rao and Addepalli, Tathababu and Srinubabu, Manumula and Medasani, Sivasubramanyam and Nimmagadda, Padmaja and Raju, C. and Sharma, Manish and Al Gburi, Ahmed Jamal Abdullah and Zakaria, Zahriladha (2025) Compact Quad-Port MIMO Antenna Employing Defected Substrate and Ground Plane for Sub-6 GHz 5G Communication. IEEE Access, 13. 195749 - 195762. ISSN 2169-3536

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Abstract

This work presents a low-profile, compact quad-port MIMO antenna structure optimized for sub-6 GHz and X-band wireless communication. The antenna employs a tapered and stepped monopole radiator in conjunction with defected substrate and ground plane modifications to enhance isolation, improve diversity performance, and support dual-band operation. A single monopole element, designed on an FR-4 substrate ( εr=4.3 , tan δ=0.002 ), has been extended into a quad-port configuration with orthogonally oriented ports to achieve polarization diversity and minimize mutual coupling. Although the spacing is less than λmax /2 ( 0.14 λ0 ), a reduced inter-element gap of 11.25 mm is adopted to achieve compact integration. The antenna measures 44×44×1.6 mm3 and operates across two frequency bands: 2.75–4.4 GHz and 10.33–13 GHz (S xx< -10 dB) with Sxy values below –17.5 dB and –25 dB in the respective bands, ensuring robust MIMO performance. With its compact design and efficient radiation characteristics, the proposed antenna is well-suited for 5G-NR systems, IoT devices, V2X communication, and satellite-based applications.

Item Type: Article
Uncontrolled Keywords: 5G and X-band, Compact Size, Defected substrate and ground, Dual band, MIMO Antenna, Tapered and stepped Antenna
Divisions: Faculty Of Electronics And Computer Technology And Engineering
Depositing User: Norhairol Khalid
Date Deposited: 12 Dec 2025 07:28
Last Modified: 12 Dec 2025 07:28
URI: http://eprints.utem.edu.my/id/eprint/29252
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