Dual Band, Miniaturized, Implantable Antenna Design with On-body Antennas for Wireless Health Monitoring

A modified Hilbert fractal geometry and serpentine radiator-based implant antenna is proposed for dual band medical operations in both the MICS band (402-405 MHz) and ISM band (2.4–2.48 GHz). The antenna has miniaturized dimensions of 5.5 x 7.6 x 0.8 mm3 (width x height x thickness) and is simulated...

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Bibliographic Details
Published in:Applied Computational Electromagnetics Society journal 2020-04, Vol.35 (4), p.443
Main Authors: Kaka, Ademola O, Toycan, Mehmet, Walker, Stuart D, Kavaz, Doğa
Format: Article
Language:English
Subjects:
Antenna design
Antennas
Biocompatibility
Electronic implants
Fractal geometry
Human tissues
Radiators
Reflectance
Remote monitoring
Zirconium dioxide
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Summary:A modified Hilbert fractal geometry and serpentine radiator-based implant antenna is proposed for dual band medical operations in both the MICS band (402-405 MHz) and ISM band (2.4–2.48 GHz). The antenna has miniaturized dimensions of 5.5 x 7.6 x 0.8 mm3 (width x height x thickness) and is simulated inside a four layer (air, skin, fat and muscle) model with dimensions of 150 mm x 75mm x 55 mm. A Zirconia (ɛr=29) superstrate and shorting pin were utilized to achieve biocompatibility and the desired resonance. Relatively stable and omni-directional radiation patterns were achieved for the dual band operation. An ISM band on-body antenna (5.8 x 5.5 x 0.8 mm3) was proposed to generate a wake-up signal while the wireless telemetry transmission was achieved using the MICS band on-body antenna (5.8 x 5.5 x 0.8 mm3). Implant and on-body antennas demonstrated a reflection coefficient (S11) better than -10 dB characteristics. To adhere to the SAR regulation limit of 1.6W/kg, the peak incident power should not exceed 0.25 mW and 0.2 mW for the ISM band and MISC band on-body antennas respectively. Propagation channel characteristics were simulated by observing the S12 and S13 characteristics and satisfactory results were achieved. The peak gain for the implant, MICS band and ISM band on-body antennas were -39.8 dBi, -35.6 dBi and -23 dBi, respectively due to the miniature dimensions. The miniaturized characteristics, dual-band operation, biocompatibility and stable characteristics in the presence of human tissue model make both the implant and on-body antennas suitable for biomedical monitoring systems.
ISSN:1054-4887
1943-5711