Re-Radiation Antenna Layout for Uniform Wireless Charging Fields
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Solution Overview
Problem
Conventional wireless charging devices for vehicles suffer from poor radio wave transmission and reception due to metal shielding, leading to shadow areas and reduced wireless charging efficiency, and existing re-radiation antennas have low electric field distribution uniformity, which further deteriorates performance.
Innovation Solution
The wireless charging device incorporates a re-radiation antenna with a radiation pattern unit along the outer circumference of an insulating plate, featuring quarter ellipse extension patterns and slit shapes to enhance electric field uniformity and intensity, along with a meander pattern and through hole structure to minimize interference and maintain charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional re-radiation antenna is disposed in a wireless charging device, then wireless communication signal retransmission is attempted, but shadow areas occur due to low electric field distribution uniformity
Solution Approach 1:
The patent applies local quality by creating different radiation patterns at different locations of the antenna. The radiation pattern unit includes a first extension pattern and a second extension pattern that are symmetrical to each other, with each pattern having quarter ellipse shapes elongated in lateral directions. This creates localized variations in electric field distribution that collectively improve overall uniformity and eliminate shadow areas.
Solution Approach 2:
The patent uses asymmetry in the design of the radiation pattern unit, where the first extension pattern and second extension pattern are symmetrical to each other but asymmetrical relative to the insulating plate's longitudinal axis. The patterns are elongated in lateral directions perpendicular to the insulating plate's main axis, creating an asymmetrical radiation distribution that improves electric field uniformity.
2Reliability
If a conventional re-radiation antenna is disposed in a wireless charging device, then wireless communication signal retransmission is attempted, but wireless charging efficiency is deteriorated due to interference with power transmission coil
Solution Approach 1:
The patent introduces an insulating plate as an intermediary between the re-radiation antenna and the power transmission coil. The insulating plate has a through hole at its center, allowing the antenna to be disposed along the outer circumference while maintaining electrical insulation. This intermediary structure prevents interference with the power transmission coil while enabling communication signal retransmission.
3Ease of manufacture
If the radiation pattern unit has simple shape, then manufacturing is easier, but electric field distribution uniformity is insufficient
Solution Approach 1:
The patent applies spheroidality by using quarter ellipse shapes for both the first extension pattern and the second extension pattern. These curved patterns are elongated in lateral directions and symmetrical to each other, creating a smooth, curved radiation pattern that improves electric field distribution uniformity while remaining manufacturable through standard PCB fabrication processes.
4Reliability
If the antenna length is increased to improve communication coverage, then communication efficiency improves, but interference with power transmission increases
Solution Approach 1:
The patent resolves the length conflict by transitioning from a linear antenna configuration to a two-dimensional radiation pattern unit disposed along the outer circumference of the insulating plate. The first and second extension patterns extend in lateral directions perpendicular to the insulating plate's main axis, effectively increasing the antenna's electromagnetic presence without increasing its linear dimension in the charging direction, thus minimizing interference with the power transmission coil.
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 design improves electric field distribution uniformity, increases communication efficiency, and ensures reliable wireless charging performance regardless of the external terminal's orientation, while maintaining efficient power transmission.
Implementation Method 1
a re-radiation antenna which receives an antenna signal and re-radiates the antenna signal
Implementation Method 2
a power transmission coil which supplies power to an external terminal in a wireless manner
Data Source
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AI summary
The present invention relates to a wireless charging device. A wireless charging device according to an embodiment of the present invention comprises a power transmission coil for wirelessly transmitting power to an external terminal, and a re-radiation antenna for receiving an antenna signal and re-radiating same, wherein the re-radiation antenna comprises an insulation plate, and a radiation pattern part which is formed on one surface of the insulation plate, and which is arranged along the outer circumference of the insulation plate so that one end and the other end thereof are arranged to be adjacent to each other, and the radiation pattern part includes a first extension pattern in a quarter-ellipse shape, extending in the lateral direction of the insulation plate from a position adjacent to the one end of the radiation pattern part, and a second extension pattern in a quarter-ellipse shape, symmetrical to the first extension pattern, at a position adjacent to the other end of the radiation pattern. Therefore, the uniformity of electric field distribution of the re-radiation antenna can be improved without a deterioration in wireless charging performance.