Antenna Conductive Layer Aperture Magnetic Flux Loop
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Solution Overview
Problem
RFID and short-range wireless communication systems face challenges in maintaining stable communication characteristics and extending communication range due to misalignment of antenna centers and interference from metal bodies, which affect magnetic flux linkage and communication efficiency.
Innovation Solution
The use of a conductive layer with a slit and aperture configuration that generates a large magnetic flux loop, allowing magnetic fields to effectively couple with antenna coils and extend communication range by blocking and redirecting magnetic flux, even when antennas are misaligned or of different sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna is used without a conductive layer, then the device structure remains simple, but communication stability deteriorates due to misalignment between antenna centers and interference from metal bodies
Solution Approach 1:
A conductive layer is introduced as an intermediary component between the antenna and metal bodies. This conductive layer acts as a mediator that redirects magnetic flux and compensates for misalignment issues, thereby improving communication stability without requiring changes to the antenna itself. The conductive layer serves as a buffer that facilitates magnetic coupling even when direct antenna alignment is poor.
Solution Approach 2:
The invention converts the harmful effect of metal bodies (which cause signal attenuation and interference) into a beneficial effect by using the conductive layer to redirect magnetic flux. The metal bodies that originally caused communication instability are now part of a controlled magnetic flux path, where the conductive layer guides the flux to maintain effective coupling between antennas despite the presence of interfering metal components.
2Length of moving object
If the antenna size is reduced to fit compact devices, then device portability improves, but communication range decreases due to reduced magnetic flux linkage
Solution Approach 1:
The conductive layer extends the magnetic flux path into an additional dimensional space. By placing the conductive layer adjacent to the antenna, it creates an extended magnetic circuit that compensates for the reduced size of the antenna. This dimensional extension allows small antennas to achieve larger effective magnetic flux loops, thereby maintaining communication range despite reduced physical dimensions.
Solution Approach 2:
The conductive layer acts as a counterbalancing element that compensates for the reduced magnetic flux generation capacity of smaller antennas. Just as counterweight compensates for weight differences, the conductive layer compensates for the reduced magnetic flux linkage of compact antennas by providing an additional path for magnetic flux circulation, effectively balancing the communication range.
3Speed
If antennas are placed in close proximity for short-range communication, then communication speed improves, but misalignment between antenna centers causes signal loss
Solution Approach 1:
The conductive layer serves as a mediator that facilitates magnetic coupling between closely spaced antennas. When antennas are placed in close proximity for high-speed communication, the conductive layer acts as a buffer that ensures stable magnetic flux linkage even when there is misalignment between antenna centers. This intermediary component maintains signal stability while enabling the close spacing required for fast data transmission.
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 enhances communication stability and range by ensuring magnetic flux linkage between antennas, increasing the maximum possible communication distance and maintaining effective communication even with smaller antenna sizes.
Implementation Method 1
generates a large magnetic flux loop, allowing magnetic fields to effectively couple with antenna coils
Implementation Method 2
A current flows through the conductive layer so that a magnetic field generated by a current flowing through the coil conductor is blocked
Implementation Method 3
When an external magnetic field is applied to the surface of the metal layer 30, an induced current (eddy current) occurs on the surface of the metal layer 30 and a magnetic field H1 is generated
Data Source
Figure 1
Figure 2(A)~3(B)
Figure 4(A)~4(B)
AI summary
There is provided at antenna apparatus capable of stably communicating with a communication partner and increasing the maximum possible communication range even when the antenna apparatus is relatively smaller than an antenna in the communication partner and the two antennas are disposed in close proximity on the same axis. A coil window (CW) of an antenna coil module (3) and a conductor aperture (CA) of a conductive layer (2) at least partly overlap. A magnetic flux (MF) passing through the coil window (CW) passes through the conductor aperture (CA). On the other hand, the magnetic flux does not pass through the conductive layer (2). Accordingly, the magnetic flux (MF) is diverted to a path in which the conductor aperture (CA) of the conductive layer (2) is the inside and the outer edge of the conductive layer (2) is the outside. As a result, the magnetic flux (MF) passing through the coil window (CW) of the antenna coil module (3) makes a relatively large loop and links the inside and the cutside of a coil conductor (41) in an antenna (4) in a reader/writer.