Metamaterial-Based transmit antenna coupled to a compact receiver for efficient wireless power transfer to biomedical implants
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Author |
Amine Harhouz, Djelloul Aissaoui, Abdelhalim Chaabane and Tayeb A. Denidni
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e-ISSN |
1819-6608 |
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On Pages
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1510-1518
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Volume No. |
20
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Issue No. |
18
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Issue Date |
December 30, 2025
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DOI |
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Keywords |
antennas in body transmit antennas, received antennas, metamaterials, wireless power transfer.
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Abstract
This paper presents a new antenna in body system (AIBS) for wireless power transfer applications at the ISM band. The proposed antenna uses planar microstrip technology, providing a compact size, low signal absorbing ratio (SAR), and wide bandwidth, which are the big challenges of AIBS at the ISM band. This design uses a cavity slot antenna based on microstrip technology that resonates at the ISM band 2.45 GHz for an antenna in a body system. The proposed antenna system conforms to an implantable transmit antenna (TX) and a received antenna (RX) with a gap of 30mm. The transmit antenna is designed using a square metamaterial technique to increase the band width and resonant frequency at a certain frequency. Received antenna has been designed based on a cavity gridded slot to achieve a compact size. The transmit antenna uses Rogers RT5880 substrate with a thickness of 1.575mm, while the receive antenna is implemented on Rogers RO3010 substrate with a thickness of 0.25mm. Both structures are optimized for low specific absorption rate (SAR) to enhance the power transfer efficiency (PTE). The proposed design antenna system integrated with human-body tissue, including skin, fat, and muscle, is simulated by using Computer Simulation Technology (CST) software to create a similar environment to the human body. The proposed design was fabricated and measured at 2.45 GHz. The obtained results show good performance in terms of bandwidth of transmit and received antennas (0.9 GHz- 0.200 GHz), gain 4.5 dB, 2.5 dB, and efficiency 88 %, 81%, respectively. The received antenna has a compact size of 6.83mm × 6.5mm. The transmit and receive antennas provide a good VSWR of 1.2 and 1.17, respectively. In addition, the front-to-back radiation ratios of the transmit and receive antennas are 20.4dB and 16.07dB, respectively. Designs have been fabricated and measured with minced pork because it has similar tissue to the human body. Measurement results are in good agreement with simulation results, which validate the proposed antenna designs.
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