Symmetrical Multi-Layer Rx Coil Without a Connection Bridge
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Solution Overview
Problem
Conventional receiver coils in electronic devices face space constraints due to the need for a connection bridge, which increases the overall thickness and complexity in fabrication and assembly, especially in small devices like cell phones and tablets, and do not efficiently utilize space for improved electrical performance.
Innovation Solution
A balanced, symmetrical coil design in a flexible printed circuit with in-plane parallel traces connected in series across multiple layers, eliminating the need for a connection bridge and optimizing space usage, allowing for a thinner structure and improved performance by adjusting trace width, spacing, and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a connection bridge is added to access the inner terminal of the Rx coil, then the terminal accessibility is improved, but the overall thickness and device complexity increase
Solution Approach 1:
The patent transitions from a three-dimensional connection bridge structure to a two-dimensional planar trace configuration. The inner terminal is accessed by extending the spiral trace to terminate at the edge of the coil structure, eliminating the need for vertical connection bridges and reducing overall device thickness while maintaining terminal accessibility.
Solution Approach 2:
The patent removes the connection bridge component entirely from the design. By reconfiguring the spiral trace to directly terminate at the outer edge, the design extracts and eliminates the redundant connection bridge structure, simplifying the overall device architecture and reducing thickness.
2Ease of manufacture
If a connection bridge is used to connect inner terminal to outside circuitry, then the terminal connection is achieved, but the fabrication complexity and assembly difficulty increase
Solution Approach 1:
The patent merges the spiral trace and terminal connection into a single continuous planar structure. The trace terminates directly at the outer edge to form the terminal, combining what were previously separate components (spiral trace and connection bridge) into one integrated fabrication layer, simplifying both fabrication and assembly processes.
3Ease of operation
If space is allocated for connection bridge in conventional designs, then the terminal access is enabled, but the space efficiency is reduced
Solution Approach 1:
The patent utilizes the planar dimension more efficiently by extending the trace termination to the outer edge of the spiral configuration. This two-dimensional optimization eliminates the need for additional vertical space that would be required for connection bridges, maximizing space efficiency while maintaining terminal accessibility.
Data Source
AI summary
A coil device includes a first conductor on a first layer and arranged in a first spiral shape, a second conductor on a second layer and arranged in a second spiral shape, a transition that connects the first conductor and the second conductor in series, a first terminal connected to an end of the first conductor, and a second terminal connected to an end of the second conductor. The first terminal and the second terminal are outside of the first conductor and the second conductor when viewed in plan. The first conductor and the second conductor each include a plurality of in-plane traces connected in parallel with each other.