RFID Antenna Module Winding Core Enhances Coupling
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Solution Overview
Problem
The existing technologies for secure documents like smart cards and electronic passports face challenges in enhancing coupling between the module antenna and the booster antenna, which affects the interaction with external RFID readers, particularly in achieving efficient inductive coupling.
Innovation Solution
The development of an antenna module with a winding core and a module antenna wound around it, where the chip is disposed on the module tape within the core, and glob-top is applied to protect the chip, followed by overmolding with a mold mass, ensuring effective inductive coupling with a coupler coil embedded in the card body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a module antenna is used in the smart card, then the chip size is reduced and integration is improved, but the coupling with the booster antenna is insufficient
Solution Approach 1:
A winding core is introduced as an intermediary component between the module antenna and the booster antenna. The winding core serves as a magnetic coupling mediator that enhances the inductive coupling efficiency, allowing the small module antenna to effectively communicate with the external reader through the booster antenna without increasing the chip size.
Solution Approach 2:
The winding core is constructed from composite magnetic materials that provide high magnetic permeability and low loss characteristics. This composite structure optimizes the magnetic flux distribution and enhances the coupling between the module antenna and booster antenna, resolving the contradiction between small size and coupling efficiency.
2Volume of moving object
If the module antenna is made smaller to fit the chip, then integration is improved, but the inductive coupling with external readers deteriorates
Solution Approach 1:
The winding core acts as a magnetic intermediary that compensates for the reduced size of the module antenna. By concentrating and guiding the magnetic flux through the high-permeability winding core, the system maintains strong inductive coupling efficiency despite the smaller antenna dimensions.
Solution Approach 2:
The magnetic properties of the winding core are optimized by selecting materials with specific permeability and loss characteristics. This parameter optimization ensures that the magnetic flux is efficiently coupled from the small module antenna to the booster antenna, maintaining energy efficiency despite the reduced antenna size.
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 configuration enhances the coupling between the module antenna and the booster antenna, increasing the effective reading distance with external RFID readers and improving the operational efficiency of secure documents.
Implementation Method 1
The module antenna (MA) may be inductively coupled rather than electrically connected to the card antenna (CA). In such cases, the card antenna (CA) may be referred to as a booster antenna (BA).
Data Source
AI summary
A winding core (WC) having a tubular body portion (B) and two ends is mounted by one of its ends to a module tape (MT), a module antenna (MA) is wound around the winding core (WC), a chip (CM) is disposed on the module tape (MT) within the winding core (WC). Connections (wb) are made, and glob-top (GT) is applied over the chip (CM), substantially filling the interior area of the winding core (WC). The module antenna (MA), winding core (WC) and chip (CM) may subsequently be overmolded with a mold mass (MM). The winding core (WC) may have a flange (F) at one end. Using the module antenna (MA) itself as a dam for the glob-top is disclosed. Double-sided and single-sided module tapes (MT) having vias, openings, or vias and openings are disclosed.