Chip Card Antenna Trimming for Precise Resonant Frequency Tuning
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Solution Overview
Problem
Conventional wire embedding methods for producing booster antennas in chip cards result in significant production tolerances, leading to a variation range of 1 MHz in resonant frequency, which is not suitable for high-power coil-on-module products, and reducing embedding speed to improve accuracy increases production costs.
Innovation Solution
A method is introduced to reprocess and trim the antenna after production by pressing out and removing parts of the antenna from the carrier, allowing for precise adjustment of the resonant frequency within a deviation of at most 200 kHz, using a pressing-separating process that involves forming separating points in the capacitive region of the antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the embedding speed is reduced to improve accuracy, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The patent applies preliminary action by forming separating points in the capacitive region of the antenna during the embedding process itself. This preliminary structuring enables subsequent precise trimming without requiring slower embedding speeds, thus maintaining both productivity and manufacturing precision.
Solution Approach 2:
The patent segments the antenna into distinct regions by forming separating points in the capacitive region. This segmentation allows independent trimming of antenna portions to achieve target resonant frequency while maintaining efficient production speeds through standardized processing steps.
2Manufacturing precision
If the embedding speed is reduced to improve accuracy, then manufacturing precision is improved, but production costs increase
Solution Approach 1:
The method performs preliminary formation of separating points during standard-speed embedding, enabling cost-effective precise trimming later without requiring expensive slow-speed embedding equipment or processes.
Solution Approach 2:
By segmenting the antenna with separating points, the patent enables efficient trimming operations that reduce waste and rework costs while achieving target resonant frequency accuracy through standardized processing.
3Manufacturing precision
If a portion of the antenna is removed for tuning, then manufacturing precision is improved, but the carrier structure may be damaged
Solution Approach 1:
The patent applies local quality by concentrating the trimming operation in the capacitive region where separating points are formed. This localized approach allows precise resonant frequency adjustment while the rest of the carrier structure remains undisturbed and structurally sound.
Solution Approach 2:
The capacitive region acts as an intermediary zone where separating points are formed. This intermediary structure enables antenna portion removal for tuning while the separating points serve as controlled separation interfaces that protect the main carrier structure from damage.
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 method allows for precise tuning of the antenna's resonant frequency, reducing production tolerances and maintaining the structural integrity and smooth surface of the chip card, while enabling the use of economical production methods.
Implementation Method 1
a die (234) adapted to press a region (106A) of the carrier (106) out from a carrier plane of the carrier into a recess (238)
Data Source
AI summary
A method for trimming an antenna applied on a carrier, the method including pressing a region of the carrier out from a carrier plane of the carrier, the region having a portion of the antenna and the region being selected according to a target property of the antenna, and removing at least a part of the portion of the antenna from the pressed-out region of the carrier.