Antenna Device With Segmented Metallic Layers For Magnetic Coupling
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Solution Overview
Problem
Conventional antenna devices face challenges in increasing communication distance due to the need for openings or slits in conductive layers, which restricts antenna coil layout and design flexibility, especially when a metallic shield is present.
Innovation Solution
The antenna device incorporates a substrate with a loop-shaped or spiral-shaped antenna coil, where first and second metallic layers are positioned on both sides of the coil's inner diameter, forming a slit between them, allowing for enhanced magnetic coupling without the need for external openings or slits, and can utilize the device's housing as a metallic layer to reduce material costs and simplify production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an opening or slit is formed in the conductive layer to increase communication distance, then the magnetic field shielding effect is improved, but the layout freedom of the antenna coil is restricted
Solution Approach 1:
The conductive layer is segmented into first and second metallic layers that are separated by a slit, allowing the antenna coil to be positioned freely while maintaining the magnetic field enhancement effect. The segmented structure enables independent optimization of each metallic layer's position and shape.
Solution Approach 2:
The solution transitions from a two-dimensional planar conductive layer to a three-dimensional stacked structure with first and second metallic layers positioned at different heights. This vertical arrangement allows the antenna coil to maintain its layout freedom while the stacked metallic layers provide enhanced magnetic coupling.
2Reliability
If the first and second metallic layers are formed on a separate substrate and bonded to the antenna coil, then the magnetic coupling is strengthened, but the production process becomes more complex
Solution Approach 1:
The first and second metallic layers are merged with the substrate on which the antenna coil is formed, eliminating the need for separate bonding processes. This integration simplifies the production process while maintaining strong magnetic coupling between the metallic layers and the antenna coil.
Solution Approach 2:
The substrate serves multiple functions: it provides mechanical support for the antenna coil and simultaneously serves as the mounting platform for the first and second metallic layers. This self-service approach eliminates the need for additional bonding substrates or adhesive layers.
3Reliability
If multiple separate components are used to form the metallic layers, then the magnetic field distribution is optimized, but the material cost and production complexity increase
Solution Approach 1:
The first and second metallic layers are designed to perform multiple functions: they enhance magnetic coupling, provide electromagnetic shielding, and serve as structural support. This multi-functionality reduces the need for additional components and materials.
Solution Approach 2:
The conductivity, thickness, and positional parameters of the first and second metallic layers are optimized to achieve the desired magnetic field distribution. By adjusting these parameters, the system achieves optimal performance without requiring additional materials or components.
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 effectively increases the communication distance of the antenna coil by strengthening magnetic coupling and simplifying the production process, while also reducing material costs and improving frequency matching.
Implementation Method 1
current flows in the conductive layer so as to shield a magnetic field generated by flowing of current in a coil conductor
Implementation Method 2
current flowing around the opening of the conductive layer passes around the slit, with the result that current flows also around the conductive layer by edge effect
Implementation Method 3
current flows in the conductive layer so as to shield a magnetic field generated by flowing of current in a coil conductor
Data Source
AI summary
An antenna device is provided with a substrate; an antenna coil formed into a loop-shaped or spiral-shaped on the substrate; a first metallic layer overlapping with a first part of the antenna coil in a planar view; and a second metallic layer overlapping with a second part of the antenna coil different from the first part. The first and second metallic layers are disposed on both sides of a center of an inner diameter portion of the antenna coil in a planar view, respectively. A slit formed between the first and second metallic layers overlaps with the inner diameter portion of the antenna coil in a planar view. At least one of the first and second metallic layers is formed on the substrate together with the antenna coil.