Coupling Frame Enhances RFID Transponder Activation
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Solution Overview
Problem
Conventional antenna modules in smartcards require a booster antenna to achieve desirable activation and read/write distances, limiting their performance without additional components.
Innovation Solution
Incorporating a coupling frame into the antenna module on the module tape, which is formed from a conductive metal layer and partially surrounds the module antenna, enhancing coupling with external readers without the need for a booster antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a booster antenna is added to achieve desirable activation and read/write distances, then the communication performance is improved, but the device complexity and component count increase
Solution Approach 1:
The coupling frame is integrated directly into the antenna module structure, merging the coupling function with the existing antenna components. This eliminates the need for a separate booster antenna while achieving the desired communication performance through the unified design of the coupling frame and antenna elements.
Solution Approach 2:
The coupling frame serves multiple functions: it provides structural support, enables capacitive coupling enhancement, and acts as part of the antenna system itself. This multi-functionality replaces the need for dedicated booster antenna components, reducing overall device complexity while maintaining improved activation and read/write distances.
2Reliability
If a coupling frame is integrated into the antenna module, then the activation and read/write distances are enhanced, but the manufacturing process complexity increases
Solution Approach 1:
The coupling frame is formed as an integral part of the antenna module using the same conductive layer and manufacturing processes. By combining the coupling frame formation with the existing antenna trace patterning steps, the patent avoids adding separate manufacturing operations, thereby enhancing performance without significantly increasing manufacturing complexity.
3Reliability
If the coupling frame is formed from a conductive metal layer on the module tape, then the coupling enhancement is achieved, but the material usage and layer complexity increase
Solution Approach 1:
The conductive metal layer serves dual purposes: it forms the antenna traces and simultaneously creates the coupling frame structure. This multi-functional use of the same material layer eliminates the need for additional conductive materials or separate framing components, achieving coupling enhancement without increasing overall material consumption.
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
The coupling frame enhances the activation and read/write distances of the transponder chip module, allowing for effective communication with external readers without a booster antenna, thereby improving the performance and functionality of smartcards.
Implementation Method 1
a coupling frame (CF) disposed on a module tape (MT) or chip carrier tape (CCT) to enhance coupling between a transponder chip module (TCM) and an external reader
Data Source
AI summary
A capacitive coupling enhanced (CCE) transponder chip module (TCM) comprises an RFID chip (CM, IC), optionally contact pads (CP), a module antenna (MA), and a coupling frame (CF), all on a common substrate or module tape (MT). The coupling frame (CF, 320A) may be in the form of a ring, having an inner edge (IE), an outer edge IE, 324) and a central opening (OP), disposed closely adjacent to and surrounding the module antenna (MA). A slit (S) may extend from the inner edge (IE) to the outer edge (OE) of the coupling frame (CF) so that the coupling frame (CF) is “open loop”. An RFID device may comprise a transponder chip module (TCM) having a module antenna (MA), a device substrate (DS), and an antenna structure (AS) disposed on the device substrate (DS) and connected with the module antenna (MA). A portion of a conductive layer (CL, 904) remaining after etching a module antenna (MA) may be segmented to have several smaller isolated conductive structures.