Antenna Apparatus With Magnetic Layer For Stable Wireless Range
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Solution Overview
Problem
Existing antenna systems in RFID and short-range wireless communication face challenges with communication characteristics being significantly affected by misalignment and reduced communication range due to metal bodies like battery packs, which interrupt magnetic flux and limit the effectiveness of metal layers in enhancing communication range.
Innovation Solution
The antenna apparatus includes a power supply coil, a booster electrode with a conductor aperture and slit portion, and a magnetic layer, where the magnetic layer covers the conductor aperture and slit portion, increasing the magnetic field strength and communication range by enhancing the coupling between the power supply coil, booster electrode, and conductor layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is disposed to cover a portion of the antenna coil and face the antenna module in close proximity, then the transmission/receiving antenna and the antenna coil are inductively coupled via the magnetic field generated at the metal layer, but the communication characteristic is markedly changed by misalignment between antenna centers and the metal layer may not be effective in increasing communication range when antennas are spaced apart
Solution Approach 1:
A magnetic layer is introduced as an intermediary component between the antenna coil and the metal layer. This magnetic layer serves as a mediator that guides and concentrates magnetic flux, enabling effective magnetic coupling between the antenna coil and the metal layer even when they are not in direct close proximity. The magnetic layer acts as a flux conduit that extends the effective coupling distance and reduces sensitivity to misalignment between antenna centers.
Solution Approach 2:
The invention changes the physical parameters of the system by introducing a magnetic layer with specific magnetic permeability properties. This alters the magnetic field distribution and strength in the space between the antenna coil and the metal layer, enabling effective coupling at larger distances. The magnetic layer modifies the magnetic circuit parameters to achieve both stable communication characteristics and extended communication range.
2Area of moving object
If the antenna size is reduced, then the device size is minimized, but the communication range and antenna gain are reduced
Solution Approach 1:
The magnetic layer serves as a flux-conducting intermediary that compensates for the reduced antenna size. By providing a dedicated magnetic flux path with high permeability, the magnetic layer enhances the magnetic coupling efficiency between the small antenna coil and the metal layer, thereby maintaining communication range and gain despite the reduced antenna dimensions.
Solution Approach 2:
The invention creates a composite magnetic circuit structure combining the antenna coil, magnetic layer, and metal layer. This composite structure leverages the complementary properties of each material: the antenna coil generates the magnetic field, the magnetic layer concentrates and guides the flux, and the metal layer provides additional inductive coupling. This composite approach enables small antenna size while maintaining effective communication range through enhanced magnetic coupling.
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 stabilizes communication and increases the maximum communication range even when the antenna is smaller than its partner, by increasing the magnetic field strength and preventing magnetic flux cancellation, thus improving antenna gain and directivity.
Implementation Method 1
a power supply coil (8) including a loop or spiral coil conductor (81)
Implementation Method 2
a magnetic layer (6) disposed between the power supply coil (8) or the booster electrode (71) and the conductor layer (51)
Implementation Method 3
a booster electrode (71) that faces the power supply coil (8) and includes a conductor aperture and a slit portion connected to the conductor aperture
Data Source
AI summary
An antenna apparatus includes a power supply coil, a booster electrode sheet, a magnetic sheet, and a ground substrate arranged in this order from the top. The power supply coil includes a spiral coil conductor located on a flexible substrate. The booster electrode sheet includes a booster electrode located on an insulating substrate. The booster electrode includes a conductor region covering the coil conductor, a conductor aperture covering a coil window, and a slit portion connecting the outer edge of the conductor region and the conductor aperture in plan view. The magnetic sheet covers the booster electrode sheet so that the magnetic sheet covers a region slightly larger than a region including the conductor aperture and the slit portion of the booster electrode.