NFEMI Antenna Conformal Surface for Non-Planar Hosts
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Solution Overview
Problem
Existing near-field electromagnetic induction (NFEMI) antennas face challenges in achieving strong signal strength when coupled to non-planar conductive host surfaces, such as the human body, due to reduced magnetic and electric field components, which limits communication efficiency and security.
Innovation Solution
The design incorporates a coil antenna for magnetic fields and a conductive antenna surface that geometrically conforms to the non-planar host surface, increasing capacitance and signal strength by maximizing the distance between conductive surfaces, thereby enhancing both magnetic and electric field interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional NFEMI antenna is used, then the device structure is simple, but the signal strength is weak when coupled to non-planar conductive surfaces
Solution Approach 1:
The patent combines a coil antenna portion (magnetic field antenna) and a conductive antenna surface (electric field antenna) into a single NFEMI device, merging magnetic and electric field components to achieve stronger signal strength when coupled to non-planar conductive surfaces like the human body
Solution Approach 2:
The conductive antenna surface is configured to geometrically conform to the non-planar host surface (e.g., ear surface), using curved surfaces instead of flat planes to maximize contact area and capacitance, thereby improving signal strength and communication reliability
2Reliability
If the conductive antenna surface conforms to the non-planar host surface, then the capacitance and signal strength increase, but the manufacturing complexity increases
Solution Approach 1:
The conductive antenna surface can be implemented as a flexible thin film or coating that can be conformally deposited onto the coil antenna portion, allowing it to geometrically conform to non-planar surfaces while maintaining ease of manufacture through standard thin-film fabrication techniques
3Reliability
If the antenna is placed inside the ear canal, then the communication security is improved, but the far-field radiation increases
Solution Approach 1:
The patent operates at low frequencies (e.g., below 100 MHz) where the wavelength is much larger than the antenna dimensions, causing the electromagnetic fields to be confined to the near-field region and preventing far-field radiation, thereby maintaining communication security when the antenna is placed inside the ear canal
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration results in a robust and secure communication signal that follows body contours, reducing far-field radiation and improving communication robustness, even when the antenna is partially or wholly inside a host surface, such as an ear canal.
Implementation Method 1
a coil antenna portion configured as a magnetic field antenna
Implementation Method 2
the geometrical conforming of the conductive antenna surface is configured to increase a capacitance of the electric field antenna
Data Source
AI summary
One example discloses a near-field electromagnetic induction (NFEMI) device configured to be coupled to a non-planar conductive host surface, including: a coil antenna portion configured as a magnetic field antenna; and a conductive antenna surface configured as an electric field antenna; wherein the conductive antenna surface geometrically conforms to the non-planar host surface.