Multi-Mode Wireless Antenna Shielding for Flexible Power Transfer
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Solution Overview
Problem
Existing near-field magnetic coupling antennas suffer from inefficiencies due to inadequate shielding from adjacently positioned magnetic and dielectric materials, leading to energy loss, interference, and reduced transmission range, requiring precise alignment and orientation for optimal operation.
Innovation Solution
The antenna design incorporates strategically positioned shielding materials, such as ferrite, to minimize interference and enhance mutual inductance, along with a coil selection circuit to manage parasitic currents, allowing operation across multiple frequency bands including Qi and Rezence standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If near-field magnetic coupling is used for wireless energy transfer, then wireless power transmission is enabled, but energy loss occurs due to inadequate shielding from magnetic and dielectric materials
Solution Approach 1:
Ferrite shielding materials are introduced as intermediary elements between the antenna coils and adjacent magnetic or dielectric materials. These shielding materials act as mediators that redirect magnetic field lines away from harmful interactions, preventing energy loss while maintaining wireless power transfer functionality
Solution Approach 2:
The patent converts the potentially harmful magnetic field interactions with adjacent materials into beneficial effects by using ferrite shielding that guides magnetic flux through controlled paths. The shielding materials transform what would be energy-loss-inducing interactions into productive magnetic coupling that enhances wireless power transfer efficiency
2Device complexity
If prior art antenna designs are used, then simple construction is maintained, but transmission range is reduced due to low quality factor and interference
Solution Approach 1:
The patent modifies key parameters of the antenna system by introducing ferrite shielding materials with specific magnetic properties and optimizing their placement. These parameter changes increase the quality factor of the antenna coils, which directly extends the wireless transmission range while maintaining construction simplicity
Solution Approach 2:
The antenna construction combines conventional conductive materials with ferrite magnetic shielding materials to create a composite structure. This composite approach maintains the simplicity of traditional antenna construction while adding the beneficial properties of ferrite materials to extend transmission range and reduce interference
3Volume of moving object
If adjacently positioned magnetic and dielectric materials are present, then compact integration is achieved, but interference with magnetic fields occurs causing energy loss
Solution Approach 1:
Ferrite shielding materials are positioned between the antenna coils and adjacent magnetic or dielectric materials to serve as intermediaries. These materials prevent direct harmful interactions while allowing the compact integrated structure to be maintained, as the shielding layers are thin and can be integrated within the existing compact form factor
4Use of energy by moving object
If precise alignment and orientation are required for optimal operation, then maximum transfer efficiency is achieved, but positional flexibility is reduced
Solution Approach 1:
The ferrite shielding materials modify the magnetic field distribution parameters to create a more uniform and extended field pattern. This parameter change allows the antenna to maintain high transfer efficiency over a broader range of positions and orientations, thereby increasing positional flexibility without sacrificing efficiency
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
The design achieves efficient wireless transfer of electrical energy and data with increased positional flexibility and reduced heating, supporting multiple standards and orientations while maintaining high quality factor and mutual inductance.
Implementation Method 1
strategically positioned shielding materials, such as ferrite, to minimize interference and enhance mutual inductance
Implementation Method 2
Near-field magnetic coupling enables the transfer of electrical energy and/or data wirelessly through magnetic induction between a transmitting antenna and a corresponding receiving antenna
Implementation Method 3
coil selection circuit to manage parasitic currents
Data Source
AI summary
Various embodiments of a multi-mode antenna are described. The antenna is preferably constructed having a first inductor coil and a second inductor coil. A plurality of shielding materials are positioned throughout the antenna to minimize interference of the magnetic fields that emanate from the coils from surrounding materials. The antenna comprises a coil control circuit having at least one of an electric filter and an electrical switch configured to modify the electrical impedance of either or both the first and second coils.