RFID Tag Antenna Circuit Electromagnetic Connection
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Solution Overview
Problem
Conventional RFID tag manufacturing requires precise alignment and electrical connection of fine connection terminals on IC chips to antenna sheets, leading to high costs and reduced productivity, as well as vulnerability to external forces due to rigid protection methods.
Innovation Solution
A minute conductive loop structure on the IC chip allows electromagnetic connection to the antenna circuit, eliminating the need for direct electrical contact and simplifying the mounting process, enabling non-contact communication and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precise alignment and electrical connection of connection terminals are implemented, then reliable electrical connection is achieved, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The patent extracts the connection terminals from the IC chip surface and integrates them into the antenna sheet as connection pads. This eliminates the need for separate alignment and connection processes, allowing the IC chip to be mounted without precise terminal alignment, thereby improving productivity while maintaining connection reliability through the integrated antenna sheet design.
Solution Approach 2:
The patent merges the antenna function and connection terminal function into a single antenna sheet structure. The connection pads are formed as part of the antenna pattern on the sheet, combining two previously separate functions (antenna radiation and electrical connection) into one integrated component, simplifying the mounting process and improving manufacturing efficiency.
2Reliability
If precise alignment and electrical connection of connection terminals are implemented, then reliable electrical connection is achieved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the connection terminals from the IC chip surface and integrates them into the antenna sheet as connection pads. This eliminates the need for separate alignment and connection processes, allowing the IC chip to be mounted without precise terminal alignment, thereby improving productivity while maintaining connection reliability through the integrated antenna sheet design.
Solution Approach 2:
The patent replaces the mechanical alignment and physical connection system (requiring precise terminal-to-terminal alignment) with an electromagnetic field-based connection system. The IC chip communicates with the antenna sheet through electromagnetic coupling, eliminating the need for mechanical precision in terminal alignment and reducing manufacturing complexity and cost.
3Reliability
If rigid protection with resin mold or underfill material is applied, then connection parts are protected from external force, but thickness increases and flexibility deteriorates
Solution Approach 1:
The patent extracts the connection terminals from the IC chip surface and integrates them into the antenna sheet as connection pads. This eliminates the need for separate alignment and connection processes, allowing the IC chip to be mounted without precise terminal alignment, thereby improving productivity while maintaining connection reliability through the integrated antenna sheet design.
Solution Approach 2:
The patent uses the antenna sheet itself as a flexible protective structure. The sheet material naturally protects the connection interface without requiring additional rigid mold compounds or underfill materials, maintaining tag flexibility and thinness while providing sufficient protection for the connection interface.
4Reliability
If rigid protection with resin mold or underfill material is applied, then connection parts are protected from external force, but flexibility deteriorates
Solution Approach 1:
The patent extracts the connection terminals from the IC chip surface and integrates them into the antenna sheet as connection pads. This eliminates the need for separate alignment and connection processes, allowing the IC chip to be mounted without precise terminal alignment, thereby improving productivity while maintaining connection reliability through the integrated antenna sheet design.
Solution Approach 2:
The patent uses the antenna sheet itself as a flexible protective structure. The sheet material naturally protects the connection interface without requiring additional rigid mold compounds or underfill materials, maintaining tag flexibility and thinness while providing sufficient protection for the connection interface.
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 results in a thin, flexible, and cost-effective RFID tag with simplified protection, reducing alignment precision requirements and enabling faster, less expensive production while maintaining reliable signal exchange.
Implementation Method 1
an external electromagnetic wave signal is resonated on the antenna circuit, and the resulting electromagnetic field is concentrated into the part (near the IC chip) to electromagnetically connect to an antenna (which is the conductive loop structure or capacitor structure) on the IC chip
Data Source
AI summary
A circuit chip having a loop-shaped antenna coil on a main surface and a tag sheet having an antenna pattern on a main surface are prepared, and the circuit chip is mounted on the main surface of the tag sheet so as not to place over the antenna pattern. The circuit chip is placed closely to the antenna pattern, and at least the half of the main surface is desirably faced against the antenna pattern. Thus, signals and/or power can be securely exchanged between the circuit chip (or antenna coil) and the antenna pattern. Therefore, a high-performance and rigid RFID tag can be obtained by roughly aligning the circuit chip and the tag sheet.