RFID Transponder Chip Module U-Shaped Planar Antenna Design
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Solution Overview
Problem
Current transponder chip modules for RFID devices face challenges in optimizing the coupling with contactless readers due to limitations in antenna design and manufacturing processes, particularly in achieving efficient contactless communication and reducing the need for booster antennas.
Innovation Solution
The development of transponder chip modules with a planar antenna structure having a U-shaped portion to position the outer end close to the RFID chip for wire bonding, along with the use of connection bridges and segmented metal structures within the antenna, enhances the coupling efficiency and reduces the reliance on booster antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna band extends inward towards the central area of the module tape, then the coupling efficiency with contactless readers is improved and activation distance is increased, but the manufacturing complexity and wire bonding difficulty increase
Solution Approach 1:
The antenna is divided into multiple segments including an outer band portion and an inner band portion that extends inward. This segmentation allows the antenna to achieve better coupling efficiency while maintaining manageable manufacturing complexity through modular construction
Solution Approach 2:
The antenna band extends inward from the outer edge toward the central area, utilizing the radial dimension of the module tape. This dimensional approach allows the outer end to be positioned closer to the RFID chip without increasing overall antenna area, thereby improving coupling efficiency
2Reliability
If the outer end of the antenna is positioned close to the RFID chip, then contactless communication performance is enhanced, but the wire bonding process becomes more difficult
Solution Approach 1:
The antenna band has varying characteristics along its length, with the inner band portion extending inward providing localized optimization for coupling performance while the outer band portion maintains manufacturability. This local quality variation balances performance enhancement with ease of manufacture
Solution Approach 2:
The antenna structure is designed with pre-positioned outer ends that are closer to the RFID chip before the wire bonding process. This preliminary configuration reduces the complexity of subsequent wire bonding operations by minimizing the distance and precision requirements
3Device complexity
If the antenna band extends inward, then the need for booster antennas is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The inner band portion of the antenna is merged with the central area structure, integrating the antenna function directly into the module tape assembly. This merging eliminates the need for separate booster antennas while establishing precise manufacturing tolerances for the integrated structure
Solution Approach 2:
The antenna band width, spacing, and extension distance are optimized as key parameters to achieve the desired coupling efficiency. By carefully controlling these parameters during manufacturing, the system reduces booster antenna requirements while maintaining achievable manufacturing precision
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 improves the performance and efficiency of transponder chip modules by enhancing contactless communication and reducing the need for booster antennas, leading to improved coupling with external readers and increased activation distance.
Implementation Method 1
enhances the coupling efficiency and reduces the reliance on booster antennas
Data Source
AI summary
The planar antenna (PA) of a transponder chip module (TCM) may have a U-shaped portion so that an outer end (OE) of the antenna may be positioned close to an RFID chip (IC) disposed at a central area of a module tape (MT) for the transponder chip module. A module tape (MT2) may have contact pads (CP) on one side thereof and a connection bridge (CBR) on another side thereof, and may be joined with a module tape (MT1) having a planar antenna (PA). Metal of a conductive layer (CL) within a conductive element such as a coupling frame (CF) or a planar antenna (PA) may be scribed to have many small segments. A metal sheet may be stamped to have contact side metallization, and joined with a module tape (MT) having a planar antenna (PA).