A compact 4-ports UWB MIMO antenna with WiMAX and WLAN band rejection characteristics

Al Gburi, Ahmed Jamal Abdullah and El Tayeb, Maher M. and Hamid Salem, Deena A. El and Mahmoud, Ali R. and Mohd Ibrahim, Imran and Mahmoud, Mohamed H.M. (2025) A compact 4-ports UWB MIMO antenna with WiMAX and WLAN band rejection characteristics. Progress In Electromagnetics Research C, 160. pp. 9-19. ISSN 1937-8718

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Abstract

This study introduces a compact four-port UWB MIMO antenna featuring dual-band rejection capabilities aimed at suppressing interference from coexisting wireless services, specifically WiMAX at 3.5 GHz and WLAN at 5.5 GHz. The antenna employs an inverted C-slot etched into the radiator to achieve the WiMAX notch, while EBG structures are integrated to enable suppression of the WLAN band at 5.5 GHz. Fabricated on a low-cost FR4 substrate with dimensions 52 × 52 × 1.5 mm3 (εr = 4.5), the proposed design achieves high port isolation exceeding 15 dB across the 3.1–10.6 GHz UWB range. Simulated results show an operational bandwidth from 3 to 11 GHz, extending beyond 12 GHz in measurements, without the need for additional filters or decoupling structures. The antenna exhibits quasi-omnidirectional radiation patterns with a peak gain of 7.2 dBi and significant gain suppression at the notch frequencies (−1.5 dBi at 3.5 GHz and −1.2 dBi at 5.5 GHz). It maintains a VSWR below 2 across the UWB and achieves radiation efficiency above 90% outside the notched bands. The envelope correlation coefficient remains below 0.005, enabling a high diversity gain approaching 10 dB. The EBG structures effectively reduce mutual coupling, allowing a compact element spacing of just 2 mm (approximately λ/12.5 at 12 GHz). Both simulation and measurement results validate the proposed design’s suitability for mitigating co-channel interference in UWB-MIMO applications, including satellite communications in the S/C/X bands and high-speed wireless systems.

Item Type:	Article
Uncontrolled Keywords:	Directional patterns (antenna), Microwave antennas, MIMO system, Satellite antennas, Ultra-wideband (UWB), Wimax, Wireless local area networks (WLAN)
Divisions:	Faculty Of Electronics And Computer Technology And Engineering
Depositing User:	Norfaradilla Idayu Ab. Ghafar
Date Deposited:	11 Dec 2025 01:53
Last Modified:	11 Dec 2025 01:53
URI:	http://eprints.utem.edu.my/id/eprint/29151
Statistic Details:	View Download Statistic

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