研究目的
To design and characterize a miniaturized, circularly polarized implantable antenna for retinal prosthesis systems that enhances data transfer between the implant and external camera.
研究成果
The proposed miniaturized implantable CP microstrip patch antenna, designed using modified Hilbert and serpentine geometries, shows promising simulation results for retinal prosthesis systems. It achieves good impedance matching, circular polarization, and biocompatibility, with omnidirectional radiation patterns suitable for the ISM band.
研究不足
The high conductivity of the vitreous humor imposed significant losses, resulting in relatively small gain values. The space limitation inside the eyeball and the need for biocompatibility also constrained the design.
1：Experimental Design and Method Selection:
The antenna design was initialized for the human eyeball model with vitreous humor as the surrounding material. Hilbert fractal geometry and serpentine radiator geometry were applied and modified with capacitive loading techniques to achieve desired resonance characteristics.
2：Sample Selection and Data Sources:
The antenna was simulated inside a vitreous humor sphere modeled on the size of the human eyeball.
3：List of Experimental Equipment and Materials:
PDMS substrate and superstrate materials were used for biocompatibility and conformal characteristics.
4：Experimental Procedures and Operational Workflow:
The antenna was designed on a PDMS substrate, with modifications to achieve circular polarization and optimal performance.
5：Data Analysis Methods:
Finite element methods were used to analyze the antenna with Ansoft HFSS software, focusing on return loss, axial ratio, and radiation patterns.
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