Multiband flexible MIMO antenna for NB-IoT/ISM/5 G and wearable applications
This paper presents a novel, flexible multiple-input multiple-output (MIMO) antenna with wideband and multiband capabilities. The designed antenna has compact footprints (0.3λ02) and works in the narrow band internet of things and radio frequency identification 1.8, 3.6 GHz for 5 G sub-6 GHz and ind...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025021607 |
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| Summary: | This paper presents a novel, flexible multiple-input multiple-output (MIMO) antenna with wideband and multiband capabilities. The designed antenna has compact footprints (0.3λ02) and works in the narrow band internet of things and radio frequency identification 1.8, 3.6 GHz for 5 G sub-6 GHz and industrial, scientific, and medical 2.45 and 5.8 GHz bands. It can be easily incorporated into human clothing, allowing wireless wearable sensors to monitor human vital signs and establish a communication link with smart mobile devices. The MIMO antenna consists of two modified triangular radiators. To achieve high isolation among antenna elements, a defective ground structure is adopted to decouple the low frequency band, achieving isolation greater than 20 dB. The single antenna dimensions are 0.375λ0 × 0.375λ0 × 0.00625 λ0, and the total dimensions of the two-port MIMO antenna are 0.875λ0 × 0.375 λ0 × 0.00625 λ0. Both measured and simulated results demonstrate excellent performance with a realized gain of 0.70-9dBi and radiation efficiency of 20-41 % in -10 dB impedance bandwidths of 1.67-2.02, 2.17-3.81, and 5.44-6.06 GHz. To comprehensively assess the performance characteristics of the MIMO antenna system, including the various diversity parameters are evaluated. The specific absorption ratio (SAR) of the MIMO antenna is examined for 1/10 g tissue at 1.8, 2.4, 3.6 and 5.8 GHz and found within the standard limits. |
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| ISSN: | 2590-1230 |