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A hybrid mutual coupling reduction technique in a dual-band MIMO Textile Antenna for WBAN and 5G applications

Mashagba, Hamza A. and A. Rahim, Hasliza and Adam, Ismahayati and Jamaluddin, Mohd. Haizal and Mohd. Yasin, Mohd. Najib and Jusoh, Muzammil and Sabapathy, Thennarasan and Abdulmalek, Mohamedfareq and Al-Hadi, Azremi Abdullah and Ismail, Arif Mawardi and Ping, Jack Soh (2021) A hybrid mutual coupling reduction technique in a dual-band MIMO Textile Antenna for WBAN and 5G applications. IEEE Access, 9 . pp. 150768-150780. ISSN 2169-3536

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Official URL: http://dx.doi.org/10.1109/ACCESS.2021.3125049

Abstract

This paper presents a hybrid mutual coupling reduction technique applied onto a dual-band textile MIMO antenna for wireless body area network and 5G applications. The MIMO antenna consists of two hexagonal patch antennas, each integrated with a split-ring (SR) and a bar slot to operate in dual-band mode at 2.45 GHz and 3.5 GHz. Each patch is dimensioned at 47.2 × 31 mm2. This hybrid technique results in a simple structure, while enabling significant reduction of mutual coupling (MC) between the closely spaced patches (up to 0.1 λ). This technique combines a line patch and a patch rotation technique, explained as follows. First, a line patch is introduced at an optimized distance to enable operation with a broad impedance bandwidth at both target frequencies. One of the patches is then rotated by 90° at an optimized distance, resulting in a significant MC suppression while maintaining the dual and broad impedance bandwidth. The proposed MIMO antenna is further evaluated under several bending configurations to assess its robustness. A satisfactory agreement between simulated and measured results is observed in both planar and bending conditions. Results show that the MIMO antenna achieves an impedance bandwidth of 4.3 % and 6.79 % in the 2.45 GHz and 3.5 GHz band, respectively. Moreover, very low MC (S21 <-30 dB) is achieved, with a low (< 0.002) envelop correlation coefficient, and about 10 dB of diversity gain at both desired frequencies using this technique. Even when bent at an angle of 50° at the x-and y-axes, the antenna bent maintained a realized gain of 1.878 dBi and 4.027 dBi in the lower and upper band, respectively. A robust performance is offered by the antenna against the lossy effects of the human body with good agreements between simulated and measured results.

Item Type:Article
Uncontrolled Keywords:MIMO antenna, mutual coupling reduction, wearable, wearable antenna
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:95711
Deposited By: Yanti Mohd Shah
Deposited On:31 May 2022 13:18
Last Modified:31 May 2022 13:18

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