Smart Ring Antenna Layout With Adjustable Capacitor Segments
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Solution Overview
Problem
The production of smart rings with contactless functionality is costly and requires manual adjustment of capacitors due to varying resonance frequencies based on ring diameter, leading to high costs and many accessory components for different sizes.
Innovation Solution
An antenna structure with flexible substrate and predefined separation regions allows for adjustable capacitor connections, enabling automated adjustment of resonance frequency by cutting and connecting capacitor elements to form capacitors with predetermined capacitance, reducing the need for additional passive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If capacitors are manually soldered individually to adjust resonance frequency for different ring diameters, then the resonance frequency can be precisely adjusted, but the production cost increases and automation degree decreases
Solution Approach 1:
The capacitor is divided into multiple capacitor elements (first capacitor element, second capacitor element, etc.) with different capacitance values, arranged in series along the flexible substrate. By selectively connecting different numbers of capacitor elements to the antenna, the total capacitance can be adjusted in discrete steps to achieve resonance frequency tuning without manual soldering of individual capacitors.
Solution Approach 2:
A single flexible substrate structure serves multiple functions: it holds the antenna tracks, contains multiple capacitor elements with different capacitance values, and provides connection terminals for selective connection. This universal structure can accommodate different ring diameters and resonance frequency requirements without requiring separate capacitor components for each configuration.
2Manufacturing precision
If multiple different capacitor components are used for different ring sizes, then the resonance frequency can be optimized for each size, but the number of accessory components increases and costs rise
Solution Approach 1:
Instead of using multiple separate capacitor components for different ring sizes, the capacitor is segmented into multiple capacitor elements (first capacitor element, second capacitor element, third capacitor element, etc.) with different capacitance values, all integrated into a single flexible substrate. This allows one component to replace multiple separate components.
Solution Approach 2:
Multiple capacitor elements with different capacitance values are merged into a single flexible substrate structure, which also contains the antenna tracks and connection terminals. This consolidation reduces the number of separate accessory components while maintaining the ability to optimize resonance frequency for different ring sizes.
3Manufacturing precision
If individual capacitor adjustment is performed manually for each ring diameter, then the resonance frequency can be precisely tuned, but the production time increases and productivity decreases
Solution Approach 1:
The capacitor elements with different capacitance values are pre-positioned and integrated into the flexible substrate during manufacturing, along with the antenna tracks and connection terminals. This preliminary preparation allows for automated selection and connection of the appropriate capacitor elements during assembly, eliminating the need for manual adjustment of each capacitor during production.
Solution Approach 2:
The capacitor is segmented into multiple discrete capacitor elements that can be automatically selected and connected based on the required resonance frequency. This segmentation enables automated production processes to efficiently configure the appropriate capacitance values without manual intervention, thereby increasing productivity while maintaining tuning precision.
Data Source
AI summary
An antenna structure for a contactless wearable structure having a plurality of antenna tracks on the substrate, the opposite ends of which are connectable to form an antenna when the substrate is bent, a plurality of capacitor elements on the substrate that are couplable to the antenna for adjusting the resonance frequency of the antenna, and at least one predefined separation region, by means of which it is possible to adjust which of the plurality of capacitor elements are electrically conductively connectable to the antenna when the substrate is bent, in order to form at least one capacitor with a predetermined total capacitance that is electrically conductively coupled to the antenna.