RFID Inlay Antenna Sharing Circuit for Size Reduction
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Solution Overview
Problem
Existing RFID inlays with multiple antennas for power reception and signal transmission are large in size due to unwanted coupling between antennas, limiting their application range and reducing transmission signal intensity.
Innovation Solution
An RFID inlay design where a single antenna functions as both a power receiving and transmitting antenna, utilizing antenna sharing circuits to prevent coupling and enable downsizing, with RFIC terminals for power reception and signal output, and directional couplers or duplexers to manage signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are used for power reception and signal transmission, then the device can perform both functions, but the device size increases and unwanted coupling between antennas occurs
Solution Approach 1:
The patent combines the power receiving antenna and signal transmitting antenna into a single integrated antenna structure. This merging eliminates the need for separate antenna elements, thereby reducing device size while maintaining both power reception and signal transmission capabilities through shared antenna resources
Solution Approach 2:
The single antenna in the patent is designed to serve multiple functions: it acts as both a power receiving antenna and a signal transmitting antenna. This multi-functional design allows the antenna to perform diverse roles without requiring additional antenna elements, thus avoiding coupling issues and reducing overall device area
2Area of stationary object
If multiple antennas are arranged close to each other to reduce size, then device size decreases, but unwanted coupling occurs and transmission signal intensity is reduced
Solution Approach 1:
By merging the power receiving and signal transmitting functions into a single antenna, the patent eliminates the proximity-induced coupling problem that would occur with multiple closely-spaced antennas. The unified antenna structure ensures full transmission signal intensity without energy absorption from adjacent antenna elements
3Adaptability or versatility
If multiple antennas are used, then both power reception and signal transmission can be performed, but the device complexity increases
Solution Approach 1:
The patent reduces device complexity by merging multiple antenna elements into a single integrated antenna structure. This consolidation simplifies the overall device architecture, reducing the number of components that need to be designed, manufactured, and maintained while preserving all necessary functional capabilities
Solution Approach 2:
The single antenna is designed with universal functionality to handle both power reception and signal transmission tasks. This multi-functional approach eliminates the need for separate specialized antenna elements, thereby reducing device complexity while maintaining adaptability for various communication functions
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 solution allows for a reduction in overall size while avoiding unwanted antenna coupling, enhancing transmission signal intensity and expanding the application range of the RFID inlay.
Implementation Method 1
an antenna that receives the electromagnetic wave for the power reception and generates an electromagnetic wave for the RFID
Data Source
AI summary
An RFID inlay includes an RFID module and an antenna. The RFID module includes an RFIC and an antenna sharing circuit provided between the RFIC and the antenna. The RFIC includes a power receiving terminal to which power induced upon receipt of an electromagnetic wave for power reception is input and a transmitting terminal from which a transmission signal for RFID is output. Moreover, the antenna receives the electromagnetic wave for power reception and generates an electromagnetic wave for RFID.