Parasitic Antennas Extend Wireless Power Range
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Solution Overview
Problem
The existing wireless power transmission systems using magneto mechanical principles face inefficiencies due to weak coupling between primary and secondary antennas, leading to reduced energy transfer efficiency, particularly in environments with stray inductance and impedance mismatch.
Innovation Solution
The implementation of parasitic antennas as passive repeaters, tuned to resonate at the operating frequency, extends the range of wireless power transmission by creating areas of maximum power transmission and compensating for stray inductance, thereby improving transfer efficiency by matching source and load impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If parasitic antennas are added to extend transmission range, then coverage area is improved, but device complexity increases
Solution Approach 1:
Parasitic antennas serve as intermediary elements between the primary transmit antenna and remote receivers. These passive repeaters receive electromagnetic energy from the primary antenna and re-radiate it, extending the effective coverage area without requiring active signal processing or complex control systems. The parasitic antennas mediate the energy transfer across extended distances by creating intermediate energy zones.
2Loss of energy
If parasitic antennas are used to compensate for stray inductance, then energy transfer efficiency is improved, but impedance matching complexity increases
Solution Approach 1:
The parasitic antennas are designed with specific resonant frequencies that match the operating frequency of the wireless power transmission system. By adjusting the electrical parameters (inductance and capacitance) of the parasitic antennas, they are tuned to resonate at the desired frequency, which compensates for stray inductance effects and improves energy transfer efficiency. This parameter tuning creates a resonant coupling effect that enhances power transfer while maintaining manageable impedance matching.
3Reliability
If multiple parasitic antennas are deployed to maintain efficiency in lossy environments, then reliability is improved, but device complexity increases
Solution Approach 1:
The wireless power transmission system is segmented into multiple independent parasitic antenna units distributed throughout the environment. Each parasitic antenna operates as an independent energy reception and re-radiation node, creating multiple parallel power transfer pathways. This segmentation allows the system to maintain reliability in lossy environments by providing redundant energy transfer routes, where if one path is blocked or degraded, other paths can compensate.
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 power transfer efficiency by allowing power to be received and re-radiated by parasitic antennas, increasing the coverage area and maintaining efficiency even in lossy environments like rooms with metal objects, while keeping within safety limits.
Implementation Method 1
Power is transferred from a wireless transmitter to all of the parasitic antennas in range. These parasitic antennas form tuned resonators that create areas of maximum power transmission.
Implementation Method 2
These parasitic antennas form tuned resonators that create areas of maximum power transmission. A wireless power receiver is in the range of the parasitic antenna.
Data Source
AI summary
Wireless power transfer is created using a first antenna that is part of a magnetic resonator, to create a magnetic field in an area of the first antenna. One or more parasitic antennas repeats that power to create local areas where the power is more efficiently received.