Surface-Wave Antenna Structure for Long-Range Wireless Power
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Solution Overview
Problem
Existing wireless power transmission methods face inefficiencies due to line-of-sight requirements, distance limitations, and interference from obstacles, particularly when using lasers, microwaves, magnetic field resonance, or electromagnetic induction.
Innovation Solution
The technique employs an antenna apparatus with two perpendicular electrodes, a primary coil connecting them, and a secondary coil magnetically coupled to the primary coil, utilizing surface waves to transmit power efficiently over long distances without the need for a direct line of sight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If magnetic field resonance or electric field resonance is used for wireless power transmission, then power can be transmitted wirelessly between two points, but the efficiency of transmit drops when the distance between antennas changes from the resonant condition
Solution Approach 1:
The patent employs tunable resonant circuits with variable capacitors and inductors that can dynamically adjust their resonant frequency and coupling characteristics. This allows the system to maintain optimal resonance conditions and high transmission efficiency even when the distance between transmitting and receiving antennas changes, resolving the contradiction between maintaining efficiency and adapting to distance variations.
Solution Approach 2:
The system changes operational parameters including resonant frequency, coupling coefficient, and impedance matching ratios to optimize power transmission at different distances. By continuously adjusting these parameters, the system maintains high efficiency across varying separation distances between antennas.
2Use of energy by moving object
If electromagnetic induction is used for wireless power transmission, then power can be transmitted between close locations, but the transmit distance is limited and power can be transmitted only between locations that are nearly in contact
Solution Approach 1:
The patent utilizes resonant oscillation at specific frequencies to enhance the coupling between transmitting and receiving coils. By operating at resonant frequencies, the system extends the effective transmission distance beyond what conventional electromagnetic induction can achieve, while maintaining high efficiency through resonant energy transfer.
Solution Approach 2:
The system dynamically adjusts coupling coefficients and resonant frequencies to optimize performance at different transmission distances, enabling efficient power transfer over extended ranges while maintaining the benefits of inductive coupling.
3Use of energy by moving object
If a laser is used for wireless power transmission, then power can be transmitted using a straight beam, but power cannot be transmitted unless the receiving party is in a line-of-sight position and there must be no obstacles between the laser device and the receiving party
Solution Approach 1:
The patent replaces laser-based optical transmission with electromagnetic resonance-based transmission. This substitution eliminates the line-of-sight requirement and obstacle sensitivity inherent in laser systems, allowing power transmission through walls and around obstacles while maintaining efficiency through resonant coupling between transmitting and receiving antennas.
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 enhances wireless power transmission efficiency by confining power transmission to a two-dimensional plane, allowing for longer-range transmission and flexibility in power path alignment, even when obstacles are present.
Implementation Method 1
a second coil magnetically coupled to the first coil
Data Source
AI summary
An antenna apparatus for wireless power transmission, the antenna apparatus includes: two electrodes being perpendicular to each other; a first coil connecting the two electrodes; and a second coil magnetically coupled to the first coil.