Design of Small-Sized Spiral Slot PIFA Antenna Used Conformally in Laminated Body Tissues
This paper presents a novel Spiral Slot Planar Inverted-F Antenna (SSPIFA) specifically designed for telemedicine and healthcare applications, featuring compact size, biocompatible safety, and high integration suitability. By replacing the conventional top metal patch of a Planar Inverted-F Antenna...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-05-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/25/9/2938 |
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| author | Rong Li Jian Liu Cuizhen Sun Wang Yao Ying Tian Xiaojun Huang |
| author_facet | Rong Li Jian Liu Cuizhen Sun Wang Yao Ying Tian Xiaojun Huang |
| author_sort | Rong Li |
| collection | DOAJ |
| description | This paper presents a novel Spiral Slot Planar Inverted-F Antenna (SSPIFA) specifically designed for telemedicine and healthcare applications, featuring compact size, biocompatible safety, and high integration suitability. By replacing the conventional top metal patch of a Planar Inverted-F Antenna (PIFA) with a slot spiral radiator whose geometry is precisely matched to the ground plane, the proposed antenna achieves a significant size reduction, making it ideal for encapsulation in miniaturized medical devices—a critical requirement for implantation scenarios. Tailored for the ISM 915 MHz band, the antenna is fabricated with a four-turn slot spiral etched on a 30 mm-diameter dielectric substrate, achieving an overall height of 22 mm and an electrically small profile of approximately 0.09λ × 0.06λ (λ: free-space wavelength at the center frequency). Simulation and measurement results demonstrate a −16 dB impedance matching (S11 parameter) at the target frequency, accompanied by a narrow fractional bandwidth of 1% and stable right-hand circular polarization (RHCP). When implanted in a layered biological tissue model (skin, fat, muscle), the antenna exhibits a near-omni directional radiation pattern in the azimuthal plane, with a peak gain of 2.94 dBi and consistent performance across the target band. These characteristics highlight the SSPIFA’s potential for reliable wireless communication in implantable medical systems, balancing miniaturization, radiation efficiency, and biocompatible design. |
| format | Article |
| id | doaj-art-7dca6bc84cd84c54b32edffd04b6617c |
| institution | DOAJ |
| issn | 1424-8220 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
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| series | Sensors |
| spelling | doaj-art-7dca6bc84cd84c54b32edffd04b6617c2025-08-20T02:59:12ZengMDPI AGSensors1424-82202025-05-01259293810.3390/s25092938Design of Small-Sized Spiral Slot PIFA Antenna Used Conformally in Laminated Body TissuesRong Li0Jian Liu1Cuizhen Sun2Wang Yao3Ying Tian4Xiaojun Huang5College of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710061, ChinaCollege of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710061, ChinaCollege of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710061, ChinaCollege of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710061, ChinaCollege of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710061, ChinaCollege of Communication and Information Engineering, Xi’an University of Science and Technology, Xi’an 710061, ChinaThis paper presents a novel Spiral Slot Planar Inverted-F Antenna (SSPIFA) specifically designed for telemedicine and healthcare applications, featuring compact size, biocompatible safety, and high integration suitability. By replacing the conventional top metal patch of a Planar Inverted-F Antenna (PIFA) with a slot spiral radiator whose geometry is precisely matched to the ground plane, the proposed antenna achieves a significant size reduction, making it ideal for encapsulation in miniaturized medical devices—a critical requirement for implantation scenarios. Tailored for the ISM 915 MHz band, the antenna is fabricated with a four-turn slot spiral etched on a 30 mm-diameter dielectric substrate, achieving an overall height of 22 mm and an electrically small profile of approximately 0.09λ × 0.06λ (λ: free-space wavelength at the center frequency). Simulation and measurement results demonstrate a −16 dB impedance matching (S11 parameter) at the target frequency, accompanied by a narrow fractional bandwidth of 1% and stable right-hand circular polarization (RHCP). When implanted in a layered biological tissue model (skin, fat, muscle), the antenna exhibits a near-omni directional radiation pattern in the azimuthal plane, with a peak gain of 2.94 dBi and consistent performance across the target band. These characteristics highlight the SSPIFA’s potential for reliable wireless communication in implantable medical systems, balancing miniaturization, radiation efficiency, and biocompatible design.https://www.mdpi.com/1424-8220/25/9/2938Laminated body tissuePIFASlot antennaSpiral antennaConformal antenna |
| spellingShingle | Rong Li Jian Liu Cuizhen Sun Wang Yao Ying Tian Xiaojun Huang Design of Small-Sized Spiral Slot PIFA Antenna Used Conformally in Laminated Body Tissues Sensors Laminated body tissue PIFA Slot antenna Spiral antenna Conformal antenna |
| title | Design of Small-Sized Spiral Slot PIFA Antenna Used Conformally in Laminated Body Tissues |
| title_full | Design of Small-Sized Spiral Slot PIFA Antenna Used Conformally in Laminated Body Tissues |
| title_fullStr | Design of Small-Sized Spiral Slot PIFA Antenna Used Conformally in Laminated Body Tissues |
| title_full_unstemmed | Design of Small-Sized Spiral Slot PIFA Antenna Used Conformally in Laminated Body Tissues |
| title_short | Design of Small-Sized Spiral Slot PIFA Antenna Used Conformally in Laminated Body Tissues |
| title_sort | design of small sized spiral slot pifa antenna used conformally in laminated body tissues |
| topic | Laminated body tissue PIFA Slot antenna Spiral antenna Conformal antenna |
| url | https://www.mdpi.com/1424-8220/25/9/2938 |
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