Antenna Device With Slit Conductor Surfaces for Metal Casing Shielding
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Solution Overview
Problem
In electronic appliances with metal casings, the built-in antenna coil is often shielded, leading to degraded communication performance and compromised electrical shielding and potential stability due to the metal casing's shielding properties, and forming openings or slits to mitigate this affects design and shielding effectiveness.
Innovation Solution
An antenna device with a feeder coil and two conductor surfaces, each featuring slits that are magnetically coupled, functioning as both shielding and radiating elements, ensuring high antenna radiation efficiency and maintaining electrical characteristics and communication performance while minimizing visibility and design restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal casing is used to reinforce strength, then mechanical strength is improved, but the antenna coil is shielded and communication performance is degraded
Solution Approach 1:
The continuous conductor surface is segmented by forming slits that extend toward the outer edge, creating multiple regions that function as radiating elements while maintaining the overall shielding structure. This segmentation allows magnetic flux to pass through the slits, enabling antenna operation while preserving the metal casing's strength.
Solution Approach 2:
The conductor surface with slits serves multiple functions simultaneously: it maintains electromagnetic shielding, provides electrostatic shielding, stabilizes reference potential, and acts as a radiating element for the antenna. This multi-functionality resolves the contradiction by making the same structure beneficial for both shielding and communication.
2Reliability
If openings and slits are formed in the conductor surface to avoid shielding, then communication performance is improved, but the shielding property and electrical potential stability are degraded
Solution Approach 1:
The slits are designed to extend only toward the outer edge without reaching it, creating a local modification rather than a complete breach. This local quality change allows magnetic flux to pass through while maintaining the overall continuity and shielding effectiveness of the conductor surface.
Solution Approach 2:
Instead of forming complete openings that would compromise shielding, partial slits are formed that extend sufficiently to allow magnetic flux passage for antenna operation, but not completely through the conductor surface. This partial action achieves the necessary communication performance while preserving shielding properties.
3Object-affected harmful factors
If a wide planar conductor surface is used for shielding, then electromagnetic shielding and electrostatic shielding are improved, but the antenna coil is shielded and communication is impossible
Solution Approach 1:
The wide planar conductor surface is segmented by forming slits that create magnetic flux paths, transforming the continuous shielding surface into a structure that allows magnetic coupling between the antenna coil and the conductor surface while maintaining electromagnetic and electrostatic shielding capabilities.
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 antenna device achieves secure electrical characteristics, stability of electrical potential, and communication performance by utilizing magnetically coupled conductor surfaces, reducing shielding degradation and maintaining design integrity.
Implementation Method 1
the feeder coil and the first conductor surface are magnetically coupled with each other, the first conductor surface and the second conductor surface are magnetically coupled with each other
Data Source
AI summary
An antenna device includes a feeder coil connected to a feeder circuit, a first conductor surface including a first slit that extends in a direction toward an outer edge and a second conductor surface including a second slit that extends in a direction toward an outer edge. The feeder coil is arranged at a position that is superposed with the first slit when viewed in plan, the feeder coil and the first conductor surface are magnetically coupled with each other, the first conductor surface and the second conductor surface are magnetically coupled with each other and the first slit and the second slit are arranged at positions so as to be partially superposed with each other when viewed in plan. At least a portion of the first slit is superposed with a portion of the second conductor surface other than the second slit when viewed in plan, and at least portion of the second slit is superposed with a portion of the first conductor surface other than the first slit when viewed in plan.