Antenna Device with Inductive Coupling for Metal Enclosures
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Solution Overview
Problem
Thinner communication terminal enclosures with metalized surfaces face challenges in maintaining mechanical strength, design flexibility, and effective field shielding due to electromagnetic shielding, which can lead to interference with radio frequency circuits, especially when slits or openings are used to accommodate antennas.
Innovation Solution
The implementation of an antenna device with two conductor surfaces spaced apart and connected by multiple conductors, where an antenna coil is positioned to induce current flow through these conductors, allowing the conductor surfaces to function as radiating elements without the need for slits or openings, thereby maintaining mechanical strength and shielding effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal plate is provided with a slit or an opening portion to accommodate an antenna, then the antenna can communicate with a counterpart antenna, but the mechanical strength of the metal plate decreases
Solution Approach 1:
The invention divides the antenna system into two separate components: a conventional antenna element and a metal plate used as a ground element. This segmentation allows the antenna to communicate effectively while the metal plate remains intact without slits or openings, thereby maintaining its mechanical strength.
Solution Approach 2:
The invention introduces a ground element layer between the antenna and the metal plate. This intermediary ground element enables the metal plate to function as a radiating element through electromagnetic coupling without requiring physical openings, thus preserving both communication capability and mechanical strength.
2Reliability
If a metal plate is provided with a slit or an opening portion, then the antenna can function, but the number of man-hours required for production increases
Solution Approach 1:
By segmenting the antenna system into a separate antenna element and a ground element layer, the invention eliminates the need to cut slits or openings in the metal plate, thereby simplifying the manufacturing process and reducing production time.
Solution Approach 2:
The metal plate serves dual purposes: it acts as both the ground element support structure and the radiating element itself through electromagnetic coupling. This self-service approach eliminates the need for additional processing steps like cutting or opening the metal plate.
3Reliability
If a metal enclosure is provided with a slit or an opening, then the antenna can be accommodated, but the enclosure design is restricted
Solution Approach 1:
The invention separates the antenna function from the enclosure structure by introducing a ground element layer. This allows the enclosure to remain intact and provides greater design flexibility, as the antenna system can be implemented without modifying the enclosure structure.
Solution Approach 2:
The ground element layer acts as an intermediary between the antenna and the enclosure, enabling antenna operation without requiring slits or openings in the enclosure. This maintains the integrity and design freedom of the enclosure while ensuring antenna functionality.
4Strength
If a metal plate is used as a radiating element without slits or openings, then mechanical strength is maintained, but electromagnetic shielding may interfere with radio frequency circuits
Solution Approach 1:
The ground element layer serves as an intermediary that enables controlled electromagnetic coupling between the antenna and the metal plate. This intermediary structure allows the metal plate to function as a radiating element while managing electromagnetic fields to minimize interference with other radio frequency circuits.
Solution Approach 2:
The invention creates localized electromagnetic coupling between the antenna and specific portions of the metal plate through the ground element layer. This local quality approach allows the metal plate to radiate effectively while maintaining electromagnetic shielding in other areas to prevent interference with adjacent circuits.
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 prevents cancellation of magnetic fields, maintains mechanical strength, and avoids design restrictions, ensuring effective communication without interfering with other radio frequency circuits, while allowing the enclosure to function as a radiating element.
Implementation Method 1
electromagnetic induction by the antenna coil causes an induced current to flow through the connecting conductor
Data Source
AI summary
An antenna device includes two conductor surfaces facing each other and spaced apart from each other, connecting conductors that connect the two conductor surfaces at at least two positions, and an antenna coil located in proximity to one of the connecting conductors. The connecting conductors and the two conductor surfaces define a closed loop containing a surface of a space. In a plan view of the surface of the space defined by the closed loop, the antenna coil is located at a position where the antenna coil does not overlap the surface of the space and at a position where electromagnetic induction by the antenna coil causes an induced current to flow through the connecting conductor.