RFID Electromagnetic Coupling Module with Segmented Feeder Circuit
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Solution Overview
Problem
Conventional radio IC devices in RFID systems face challenges in accurately positioning the radio IC chip on a large plastic film, leading to unstable resonant frequency characteristics, which change with shifts in positioning or when the antenna is rolled or sandwiched between dielectrics.
Innovation Solution
An electromagnetic-coupling-module-attached article is developed, featuring a radio IC chip mounted on a feeder circuit board with a resonant circuit, which determines the frequency of transmission and reception signals, ensuring stable frequency characteristics regardless of the antenna's shape, size, or position, using a radiation element that can be a metal material or dielectric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radio IC chip is mounted on a large plastic film using Au bumps, then the radio IC device can be attached to articles, but accurate positioning of the minute radio IC chip on the large film becomes extremely difficult
Solution Approach 1:
The invention divides the system into three distinct components: a small feeder circuit board (mounting the radio IC chip), a radiation element, and the plastic film. The radio IC chip is mounted on the small feeder circuit board rather than directly on the large plastic film, separating the positioning-critical chip from the large-area substrate.
Solution Approach 2:
The feeder circuit board acts as an intermediary component between the radio IC chip and the plastic film. It provides a stable, small-area mounting platform for the chip while connecting to the larger radiation element system, eliminating the need for direct positioning on the large film.
2Ease of manufacture
If the radio IC chip positioning shifts during mounting, then the radio IC device can still be assembled, but the resonant frequency characteristic at the antenna changes
Solution Approach 1:
By separating the radio IC chip mounting from the antenna element, the invention creates independent functional modules. The chip is mounted on the feeder circuit board with loose tolerances, while the antenna element is separately positioned, allowing assembly without precise alignment while maintaining frequency stability.
Solution Approach 2:
The invention applies different quality requirements to different parts: the feeder circuit board uses loose positioning tolerances for ease of manufacture, while the antenna element maintains its own positioning independence. This local differentiation allows overall system reliability without sacrificing manufacturing ease.
3Adaptability or versatility
If the antenna element is rolled or sandwiched between dielectrics, then the radio IC device can be adapted to various article shapes, but the resonant frequency characteristic at the antenna changes
Solution Approach 1:
The invention creates a dynamic system where the radiation element can be independently positioned and configured relative to the feeder circuit board. This allows the antenna to be adapted to various article shapes (rolled, sandwiched, etc.) while the resonant frequency is determined by the stable feeder circuit board configuration, not the antenna's physical state.
Solution Approach 2:
The invention extracts the frequency-determining function from the antenna element and places it in the feeder circuit board. This separation allows the antenna to be freely adapted to different article configurations without affecting the resonant frequency, which is now controlled by the stable circuit board components.
4Ease of operation
If a conventional radio IC device is used with a large plastic film antenna, then the device can communicate with reader/writer, but attaching the device to various articles becomes difficult due to resonant frequency changes
Solution Approach 1:
The invention segments the radio IC device into independent modules: the feeder circuit board with radio IC chip, and the radiation element. This modular design allows the communication function to be maintained while the radiation element can be independently adapted to various article types, greatly enhancing versatility.
Solution Approach 2:
The feeder circuit board design serves as a universal mounting platform that can be attached to various articles regardless of their shape or material. The radiation element can be configured to work with different article types while the core communication function remains stable, making the system universally applicable.
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 solution allows for accurate and stable frequency characteristics, enabling the integration of various articles in RFID systems, including those with metal bodies or dielectric materials, and enhances the reliability of asset management by maintaining frequency stability even when the module is rolled or sandwiched.
Implementation Method 1
a radiation element that radiates a transmission signal supplied from the feeder circuit of the electromagnetic-coupling module via electromagnetic coupling and/or supplies a received reception signal to the feeder circuit via the electromagnetic coupling
Implementation Method 2
a feeder circuit including a resonant circuit having a predetermined resonant frequency
Data Source
AI summary
An electromagnetic-coupling module including a radio IC chip and a feeder circuit board on which the radio IC chip is mounted and a feeder circuit including a resonant circuit having a predetermined resonant frequency is attached to an article. The article has a radiation element that radiates a transmission signal supplied from the feeder circuit of the electromagnetic-coupling module via electromagnetic coupling and that supplies a received reception signal to the feeder circuit via the electromagnetic coupling.