Planar Coil Antenna Layout to Reduce Tip Loss and Circulating Currents
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Solution Overview
Problem
Current planar antennas experience large coil losses and inefficiencies due to improper design, including high temperature rises and circulating currents, caused by improper conductor alignment and magnetic field interactions.
Innovation Solution
Incorporating high permeability objects near the tips of the planar coil to reduce magnetic losses and optimize conductor arrangements, such as using materials like silicon steel or ferrite, which reduce vertical magnetic strength and increase horizontal magnetic coupling, thereby minimizing eddy current losses and circulating currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If flat shielding and strong magnetic strength perpendicular to planar coil conductor are used, then magnetic coupling is enhanced, but coil loss increases significantly
Solution Approach 1:
The patent applies local quality by using high permeability objects specifically at the coil tips where magnetic coupling is most needed, rather than uniform shielding throughout. This concentrates the magnetic enhancement where it provides maximum benefit while minimizing overall losses in the conductor.
Solution Approach 2:
The patent employs composite materials by combining planar coil conductors with high permeability objects (such as ferrite or silicon steel) at strategic locations. This composite structure enhances magnetic coupling through the high permeability material while the conductor geometry and arrangement minimize eddy current losses.
2Ease of manufacture
If improper conductor alignment is used, then manufacturing is simplified, but circulating current increases causing large coil loss
Solution Approach 1:
The patent applies parameter changes by optimizing the conductor arrangement parameters - specifically the spacing, orientation, and positioning of parallel conductors. By carefully controlling these geometric parameters, the design achieves both manufacturability and minimization of circulating currents that cause energy loss.
3Loss of energy
If high permeability objects are added near coil tips, then tip losses are reduced, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the magnetic enhancement function into discrete high permeability objects placed at specific locations (coil tips) rather than using continuous shielding. This segmented approach reduces overall complexity while effectively addressing tip losses where they occur most.
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 solution effectively reduces coil losses and enhances wireless power transfer efficiency by minimizing tip losses and circulating currents, leading to improved system performance and reduced heat dissipation.
Implementation Method 1
Incorporating high permeability objects near the tips of the planar coil to reduce magnetic losses and optimize conductor arrangements, such as using materials like silicon steel or ferrite, which reduce vertical magnetic strength and increase horizontal magnetic coupling
Implementation Method 2
The planar antenna can have one or more high permeability objects that are added near the planar coil's tips
Data Source
AI summary
A planar antenna can include one or more high permeability objects that are added near the planar coil's tips. Further, the planar antenna includes a coil having two or more layers, with each layer having two or more turns. The planar antenna also has a restricted conductor arrangement, where there are a maximum number of turns arranged in any horizontal layer. A turn's conductor could be a single conductor or could be two (2) or more conductors arranged in parallel.