Wireless Power Reflector Antenna Near-Field Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless charging technologies face challenges in efficiently transferring power over reasonable distances and accommodating flexible placement and orientation of devices, with limitations in coupling efficiency and potential interference with other systems.
Innovation Solution
The use of loop antennas in a near-field coupling mode, where a large transmit antenna is paired with smaller repeater antennas to enhance power transfer efficiency and flexibility, allowing for efficient energy transfer over larger distances and varied device placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If plane wave radiation coupling is used between transmit and receive antennas, then wireless power transmission can be achieved, but power coupling efficiency falls off quickly with distance
Solution Approach 1:
The patent introduces a reflector as an intermediary element between the transmit and receive antennas. The reflector redirects and focuses the radiated energy toward the receive antenna, effectively mediating the energy transfer process. This allows plane wave radiation coupling to maintain acceptable power coupling efficiency over larger distances by using the reflector to concentrate and guide the electromagnetic energy rather than allowing it to disperse freely.
2Quantity of substance
If inductive coupling between transmit and receive antennas is used, then multiple devices can be charged simultaneously, but the spacing between antennas must be very close
Solution Approach 1:
The patent transitions from near-field inductive coupling (which operates in the magnetic near-field region) to far-field plane wave radiation coupling. This dimensional change in the operating regime allows the system to achieve wireless power transmission over much larger distances. The reflector is positioned to intercept and redirect the radiated plane waves, enabling multiple devices to be charged simultaneously at extended ranges beyond what traditional inductive coupling permits.
3Use of energy by moving object
If plane wave radiation is used for wireless power transmission, then unintentional radiation interference occurs, but filtering to control interference increases system complexity
Solution Approach 1:
The patent employs a reflector with specific local geometric properties designed to redirect radiation in controlled directions. By engineering the reflector's shape, orientation, and surface characteristics, the system creates localized zones of focused energy transfer while directing unwanted radiation away from sensitive areas. This spatial differentiation of radiation quality allows wireless power transmission to proceed effectively while minimizing interference with other systems without requiring complex filtering 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 approach achieves high coupling efficiency and flexible power transfer, enabling wireless charging of devices at larger distances and varied orientations while minimizing interference, thus improving the convenience and effectiveness of wireless power transmission.
Implementation Method 1
The use of loop antennas in a near-field coupling mode, where a large transmit antenna is paired with smaller repeater antennas to enhance power transfer efficiency and flexibility
Data Source
AI summary
Exemplary embodiments are directed to communicating information relating to wireless charging. A power transmitting system includes a host device with a transmit antenna. A communication interface conveys receiver information, which includes unique identifier information, from a receiver device to the host device. A controller on the host device monitors and processes the receiver information to generate notification information, which is presented to a user on a user-perceivable notifier. The transmit antenna generates an electromagnetic field at a resonant frequency to create a coupling-mode region within a near-field of the transmit antenna. The system can detect a presence of a receiver device with a receive antenna that is in the coupling-mode region and process a request for power from the receiver device. The system can also notify a user when a host device is leaving a designated region and whether the host device includes expected receiver devices.