Antenna Turn Spacing Adjustment for Resonant Frequency Tuning
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Solution Overview
Problem
Existing methods for adjusting frequency tuning in non-contact smart cards are limited by restrictive dimensions and electromagnetic constraints, making it difficult to design antennas that comply with new formats and cost-effectively match the frequency tuning of integrated chip components.
Innovation Solution
The method involves adjusting the frequency tuning of a resonant circuit by varying the regular spacing of turns in a partial zone of the antenna, creating a distributed stray inter-turn capacity, which allows for a greater spacing in an adjustment zone while maintaining a predetermined spacing in other areas, thereby optimizing the antenna's capacity and inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dimensions of non-contact smart cards are reduced to new formats (e.g., 60×35 mm), then the card size is reduced, but the possibilities of paths for the antenna wire are limited
Solution Approach 1:
The patent applies local quality by creating a partial zone in the antenna where turns are spaced irregularly rather than uniformly. This localized variation in turn spacing allows adjustment of distributed inter-turn capacity in a specific region, enabling frequency tuning adaptation to smaller card formats without requiring complete redesign of the entire antenna structure.
2Manufacturing precision
If conductive material is added or removed to adjust frequency tuning, then the frequency can be adjusted, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the geometric parameter of turn spacing in a partial zone of the antenna to adjust the distributed inter-turn capacity. By varying the spacing between turns in this specific region, the overall capacitance of the antenna is adjusted, thereby tuning the resonant frequency. This approach avoids complex material addition or removal processes while achieving precise frequency control through simple geometric modification.
3Ease of manufacture
If an integrated circuit with fixed capacity is used, then the cost is reduced, but the frequency tuning must match the existing capacity value
Solution Approach 1:
The patent introduces dynamics to the antenna design by creating an adjustable partial zone with variable turn spacing. This dynamic region allows the distributed capacity to be modified after the integrated circuit is selected, enabling frequency tuning adaptation without changing the chip itself. The system becomes adaptable to different frequency requirements while maintaining cost-effective use of standard integrated circuits.
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 enables the production of low-cost, high-quality non-contact chip cards with adjusted frequency tuning, achieving a higher quality factor and compliance with smaller card formats, while minimizing material costs by utilizing the inherent capacity of the antenna.
Implementation Method 1
an antenna (1) for a resonant circuit (2), said antenna (1) having at least a first zone (A) comprising turns having a predetermined regular spacing, and comprising turns having an inter-turn spacing which is different from the predetermined regular spacing, on at least a second partial zone (B), also called the adjustment zone
Data Source
AI summary
The invention concerns a method for adjusting frequency tuning of a resonant circuit with turns having a regular spacing generating stray inter-turn capacity. The adjusting of the frequency tuning of the resonant circuit is performed, at the level of the stray inter-turn capacity, by varying the regular spacing of adjacent turns on at least one zone of the antenna. The invention uses this adjusting method for producing an adjusted antenna for a resonant circuit, the resonant circuit and a non-contact product. The invention concerns a device programmed for antenna production and/or definition.