Symmetric Loop Antenna Layout for Stable Resonance
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Solution Overview
Problem
Conventional loop antennas suffer from issues such as defective electrical connections due to crossover lines, leading to concerns about noise radiation and resonance instability, particularly when used in wireless power supply and reception systems.
Innovation Solution
A loop antenna unit comprising two loop antennas with the same number of turns but different winding directions, positioned in line symmetry and not superposed on each other, featuring a transitional region with bent portions and an insulating layer with through holes, connected by a jumper wire to ensure electrical connection and improved symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If crossover lines are used in the loop antenna structure, then the antenna can be formed with continuous conductive paths, but defective electrical connections occur at the through holes
Solution Approach 1:
The invention extracts and removes the problematic crossover lines from the antenna structure. By eliminating the regions where conductive lines cross each other, the patent avoids creating through holes that could lead to defective electrical connections, thus resolving the contradiction between ease of manufacture and connection reliability
Solution Approach 2:
Instead of forming continuous conductive paths through crossover lines and through holes, the invention inverts the approach by using discontinuous conductive lines that are connected through jumper wires on the same layer. This alternative configuration eliminates the need for through holes while maintaining electrical continuity
2Device complexity
If conventional loop antenna designs are used, then the antenna can be implemented with simple structures, but noise radiation and resonance instability occur in high frequency bands
Solution Approach 1:
The invention introduces asymmetry in the antenna structure by positioning the transmitter and receiver antennas with different orientations and configurations. The transmitter antenna has a specific loop structure while the receiver antenna is positioned to receive power wirelessly, creating an asymmetric arrangement that reduces noise radiation and stabilizes resonance in high frequency bands
Solution Approach 2:
The patent introduces an insulating layer as an intermediary between the conductive lines and the substrate. This insulating layer with through holes provides electrical connection while isolating the conductive paths, thereby reducing noise radiation and improving resonance stability without significantly increasing structural complexity
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 enhances the uniformity of the magnetic field, reduces noise radiation, and stabilizes resonance across high frequency bands, improving the efficiency of wireless power supply and reception.
Implementation Method 1
loop antenna unit including two loop antennas... used in wireless communications and wireless power supply/reception
Implementation Method 2
enhances the uniformity of the magnetic field... loops have bent portions positioned side by side from an outermost first loop to an (n−1)th loop in the transitional region
Implementation Method 3
a jumper wire positioned on the insulating layer to cross the transitional region in a plan view, the jumper wire being formed between the first through hole and the second through hole to electrically connect the first loop and the n-th loop
Data Source
AI summary
A loop antenna unit including two loop antennas having a same number of turns and different winding directions, the two loop antennas being positioned in line symmetry and not superposed on each other in a plan view. Each of the two loop antennas includes a loop conductive line wound continuously in one direction with n turns, where n is an integer of 3 or more, forming loops from a start point to an end point on the outermost loop or the innermost loop, the loop conductive line being bent in a transitional region in a direction from an outer loop toward an inner loop such that the loops have bent portions positioned side by side from an outermost first loop to an (n−1)th loop in the transitional region, and a jumper wire positioned on the insulating layer to cross the transitional region in a plan view.