Planar Power Receiver Antenna for Multi-Directional Wireless Charging
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Solution Overview
Problem
Existing wireless power transmission systems lack a design that allows for a high degree of freedom in the installation direction of power receivers, particularly in spaces surrounded by metal, and do not efficiently transmit power to multiple devices without complex wiring or battery replacement.
Innovation Solution
A wireless power transmission system using a structure surrounded by an electromagnetic wave-shielding member, with power transmission and reception units, including a dielectric substrate and power reception antennas disposed in a specific planar shape, allowing for flexible installation and efficient power reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power receiver uses a conventional antenna structure (first and second power receivers facing each other in parallel connected by conductive posts), then power transmission efficiency can be maintained, but the installation direction freedom is limited and the structure becomes too thick for IoT devices
Solution Approach 1:
The patent transitions from a three-dimensional antenna structure (first and second power receivers facing each other in parallel) to a two-dimensional planar structure (power reception antenna line on a dielectric substrate). This dimensional reduction enables the power receiver to be installed in multiple directions while maintaining a thin profile suitable for IoT devices, directly resolving the contradiction between installation freedom and structural thickness.
2Loss of energy
If a power receiver is designed with a specific antenna orientation to optimize power reception, then power transmission efficiency improves, but the ability to install in different directions is reduced
Solution Approach 1:
The patent employs asymmetric placement of the power reception antenna line relative to the dielectric substrate, with the antenna line positioned along N sides that are adjacent to and different from each other. This asymmetric yet strategically symmetric configuration allows the antenna to effectively receive power from multiple directions while maintaining optimal transmission efficiency, resolving the contradiction between efficiency optimization and directional adaptability.
3Ease of operation
If wireless power transmission is implemented in a space surrounded by metal (regarded as a resonator), then power can be transmitted without wiring, but the resonant frequency requirements limit installation flexibility
Solution Approach 1:
The patent designs the power reception antenna with multi-directional reception capability, allowing it to function effectively regardless of its installation orientation within the resonant space. The antenna line configuration on the dielectric substrate enables universal power reception from various directions, maintaining wireless transmission ease while achieving installation flexibility in metal-surrounded environments.
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 system provides high power transmission efficiency and flexibility in installing power receivers, eliminating the need for complex wiring and battery replacement, and supports multiple power reception directions with improved sensitivity.
Implementation Method 1
a structure surrounded as a whole by an electromagnetic wave-shielding member having an appropriate conductivity
Implementation Method 2
uses a resonant mode in the structure
Implementation Method 3
at least one power transmission unit, and at least one power reception unit
Implementation Method 4
a power receiver including a dielectric substrate
Data Source
AI summary
A wireless power transmission system includes a structure surrounded as a whole by an electromagnetic wave-shielding member having an appropriate conductivity, at least one power transmission unit, and at least one power reception unit. A power reception unit includes a power receiver including a dielectric substrate, a rectifier circuit, and a power reception antenna. The power reception antenna includes power reception antenna lines in a same plane on the dielectric substrate. One ends of the power reception antenna lines are connected to the rectifier circuit, and other ends different from the one ends connected to the rectifier circuit are open ends. A planar shape of the dielectric substrate is a 2N-sided polygon with line symmetry (where N is an integer of two or more), and the power reception antenna lines are along N sides that are adjacent to and different from each other of the dielectric substrate.