NFC Antenna Passive Booster Ferrite Sheet Magnetic Field
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Solution Overview
Problem
Existing NFC antennas face limitations in maximizing the magnetic field induction, which affects their performance in near-field communication.
Innovation Solution
The design incorporates a ferrite sheet with an antenna coil and a passive booster, where the passive booster is positioned to induce additional magnetic fields that superpose with the coil's magnetic field, enhancing the overall magnetic field strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the antenna coil occupies more surface area to increase inductance, then the magnetic field strength improves, but the device size increases
Solution Approach 1:
The patent uses ferrite sheet as a magnetic composite material with high permeability to concentrate and enhance the magnetic field within a compact antenna structure. The ferrite sheet works together with the antenna coil to achieve strong magnetic field induction without requiring large surface area, resolving the contradiction between magnetic field strength and device size.
2Strength
If a passive booster is added to enhance magnetic field, then the antenna performance improves, but the device complexity increases
Solution Approach 1:
The passive booster changes the magnetic permeability parameter of the antenna structure by introducing ferrite material. This parameter change enables the system to achieve enhanced magnetic field strength without adding active components or complex control circuits, thus improving performance while maintaining relatively simple device structure.
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 increases the magnetic field of the NFC antenna, thereby improving its performance and efficiency in wireless communication.
Implementation Method 1
NFC antennas behave as inductors to operate at low frequency (long wavelengths) on electronic devices based on mutual coupling
Implementation Method 2
the passive booster induces additional magnetic fields to be superposed with a magnetic field induced by the antenna coil, which increases the magnetic field of the NFC antenna
Implementation Method 3
a loop of wire around a material gives a strong magnetic field within the loop
Data Source
AI summary
A near field communication (NFC) antenna includes a ferrite sheet, an antenna coil, and a passive booster. The antenna coil is formed on the ferrite sheet, and includes an inner sub-coil. The passive booster is formed on the ferrite sheet. A projection of the passive booster onto a plane does not overlap with a projection of an area enclosed by the inner sub-coil onto the plane. The projection of the passive booster onto the plane overlaps with a projection of the antenna coil and a projection of the ferrite sheet onto the plane.