Antenna Device With Magnetic Coupling For Thin Jacket Reliability
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Solution Overview
Problem
Existing antenna devices in communication terminals face challenges in reliability due to the risk of the power-supplying portion breaking under stress or during the integration process, especially when integrated within a thin plate-shaped resin member.
Innovation Solution
The antenna device incorporates a plate-shaped base member with an antenna coil and a magnetically coupled feeding coil, where the feeding coil is mounted on a separate base member and connected via a wiring conductor, allowing for magnetic coupling and reducing the risk of physical or electrical connections breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the antenna coil and wiring conductor are integrated inside a thin plate-shaped resin member, then the device can be attached inconspicuously, but the connecting portion between antenna coil and wiring conductor will break during resin injection molding or under stress
Solution Approach 1:
The invention divides the antenna system into separate components: the antenna coil is integrated into the thin plate-shaped resin member, while the feeding coil and its wiring conductor are positioned on the communication terminal side. This segmentation allows each component to be optimized independently, preventing connection breakage while maintaining the inconspicuous thin plate form.
Solution Approach 2:
The invention introduces a magnetic field as an intermediary between the antenna coil and feeding coil, eliminating the need for direct physical connection through the resin member. The magnetic coupling allows power and signal transmission without requiring vulnerable wiring conductors to pass through the thin plate structure.
2Ease of operation
If the jacket is made thin to be inconspicuous, then it can be attached to the communication terminal, but it will bend under impact or strong grabbing causing the connecting portion to break
Solution Approach 1:
By segmenting the antenna system into components located on opposite sides of the resin member, the invention eliminates the need for vulnerable connecting portions that would require the resin to be thick. The thin plate structure can remain flexible and inconspicuous while the functional components are protected on the terminal side.
Solution Approach 2:
The invention replaces the mechanical wiring conductor connection through the resin member with magnetic field coupling. This substitution eliminates the mechanical stress on connecting portions that would occur during impacts or grabbing, allowing the jacket to remain thin and flexible.
3Ease of manufacture
If wiring conductor is routed through the thin plate-shaped resin member, then connection is achieved, but the connection is vulnerable to breaking during manufacturing and use
Solution Approach 1:
The invention uses magnetic field coupling as an intermediary to transmit power and signals between the antenna coil and feeding coil without requiring physical wiring conductors to pass through the resin member. This eliminates the reliability issues associated with routed wiring while maintaining ease of manufacture through simple component placement.
Solution Approach 2:
The invention replaces the mechanical wiring conductor routing through the resin with electromagnetic field coupling. This substitution eliminates the vulnerability of physical connections during manufacturing processes like injection molding and during subsequent use, while maintaining straightforward integration.
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 the reliability of the antenna device by preventing the power-supplying portion from breaking under stress and during integration, ensuring stable operation and increased reliability of the communication apparatus.
Implementation Method 1
a feeding coil that is magnetically coupled to the antenna coil, that is arranged with the plate-shaped base member together with the antenna coil, and that receives and outputs a feeding signal
Data Source
AI summary
An antenna device is configured as a jacket of a communication terminal, such as a mobile terminal, and a communication apparatus includes the antenna device attached to the communication terminal. The antenna device uses an HF-band high frequency signal as a carrier frequency, and is configured as a reader/writer antenna device for a near field communication system. The base body of the antenna device is a plate-shaped base member made of a resin. An antenna coil and a feeding coil are provided integrally with the plate-shaped base member. High-frequency signals are transmitted between the feeding coil and the antenna coil through magnetic coupling in a non-contact manner.