RFID Transponder Chip Modules with U-Shaped Planar Antenna
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Solution Overview
Problem
Current transponder chip modules for RFID devices face challenges in optimizing the construction and performance, particularly in achieving efficient contactless communication and physical connection with readers, due to limitations in antenna design and coupling mechanisms.
Innovation Solution
The development of transponder chip modules with a planar antenna structure featuring 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 to enhance coupling and reduce the need for booster antennas, improves the module's performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional planar antenna structure is used, then the module construction is simple, but the activation distance and read/write capabilities are limited
Solution Approach 1:
The antenna structure is divided into multiple segments including a first planar antenna portion and a second planar antenna portion that are electrically connected. This segmentation allows each portion to be optimized for specific functions while working together to extend activation distance and improve read/write capabilities without requiring a completely complex new structure.
Solution Approach 2:
The patent embeds the planar antenna structure within the module tape substrate, nesting the antenna portions into the existing module construction. The antenna portions are integrated into the substrate layers, allowing the antenna functionality to be embedded within the compact module structure without significantly increasing overall device complexity.
2Reliability
If wire bonding is used to connect the antenna to the RFID chip, then the connection is reliable, but the manufacturing process becomes more complex
Solution Approach 1:
The patent introduces a connection bridge as an intermediary element that facilitates the connection between the antenna portions and the RFID chip. This connection bridge serves as a mediator that simplifies the wire bonding process by providing optimized bonding surfaces and geometric configurations, making the manufacturing process more manageable while maintaining reliable electrical connections.
3Reliability
If booster antennas are added to enhance signal strength, then the read/write capabilities improve, but the device complexity and size increase
Solution Approach 1:
The patent merges the antenna functionality directly into the module tape substrate by integrating planar antenna portions into the substrate layers. This consolidation combines the antenna elements with the existing module construction, achieving enhanced read/write capabilities through optimized antenna design rather than by adding separate booster antenna components, thus avoiding increased device complexity.
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 design enhances the transponder chip module's ability to efficiently communicate with readers in both contactless and contact modes, increasing the activation distance and read/write capabilities without the need for booster antennas, thereby improving the overall performance and functionality of RFID devices.
Implementation Method 1
a planar antenna (PA) disposed on a face-down side of the module tape, and extending in a band in a rectangular spiral pattern around an outer area of the module tape
Implementation Method 2
so that its outer end is not more than approximately 3 mm from an RFID chip (IC) disposed in the central area. At least the outer end of the planar antenna may be connected by wire-bonding to the RFID chip (IC)
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).