UHF RFID Loop Conductor Electromagnetic Coupling
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Solution Overview
Problem
UHF-band RFID systems in communication terminal devices face challenges in securing a sufficient communication distance due to size reduction, as the area of the ground conductor used as an antenna element decreases, limiting their effectiveness.
Innovation Solution
Incorporating a loop-shaped conductor electromagnetically coupled to the antenna conductor of the UHF-band mobile communication system, allowing the ground conductor to function as a radiating element for the RFID system without the need for a separate antenna, thereby maintaining a sufficient communication distance while keeping the device small.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the area of the ground conductor is reduced to achieve size reduction of the communication terminal device, then the device size is reduced, but the communication distance of the RFID system deteriorates
Solution Approach 1:
The patent merges the RFID antenna function with the mobile communication antenna by placing the loop-shaped conductor adjacent to the antenna conductor of the mobile communication system. This allows the mobile communication antenna to serve dual purposes: mobile communication and RFID communication, thereby eliminating the need for a separate RFID antenna and reducing overall device size while maintaining sufficient communication distance through electromagnetic coupling
Solution Approach 2:
The antenna conductor of the UHF-band mobile communication system is made to serve multiple functions by electromagnetically coupling it with the loop-shaped conductor for RFID. This multi-functional approach allows the same antenna structure to support both mobile communication and RFID operations, resolving the contradiction between size reduction and communication distance maintenance
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 configuration ensures a longer communication distance for the UHF-band RFID system while maintaining the compact size of the communication terminal device, as demonstrated by improved electromagnetic field gain and impedance characteristics.
Implementation Method 1
the loop-shaped conductor and the antenna conductor are closely adjacent to each other, and the loop-shaped conductor is electromagnetically coupled to a portion of the antenna conductor
Data Source
AI summary
A communication terminal device includes a UHF-band RFID system including a wireless IC element for UHF-band RFID and a loop-shaped conductor coupled to the wireless IC element for UHF-band RFID, and a UHF-band mobile communication system including a wireless IC element for UHF-band mobile communication and an antenna conductor coupled to the wireless IC element for UHF-band mobile communication. The loop-shaped conductor and the antenna conductor are closely adjacent to each other. The loop-shaped conductor is electromagnetically coupled to a portion of the antenna conductor.