RFID Extender Circuit Tank Topology for Range Extension
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Solution Overview
Problem
Conventional RFID technology faces challenges in maintaining effective wireless communication between RFID transponders and receivers due to distance limitations and line-of-sight obstructions, particularly in industrial environments where proximity and unobstructed alignment are difficult to achieve.
Innovation Solution
The implementation of a passive RFID extender circuit with tank circuits and resistive connections allows for indirect communication between RFID transponders and receivers, enabling wireless communication over longer distances and through obstructions by relaying signals between antenna devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RFID technology is used, then wireless communication between transponder and receiver is achieved, but the communication range is limited and line-of-sight obstruction prevents operation
Solution Approach 1:
The patent introduces an extender circuit as an intermediary device between the RFID transponder and receiver. This extender circuit includes a first tank circuit coupled to the transponder and a second tank circuit coupled to the receiver, with a coupling element connecting the two tank circuits. The extender circuit acts as a mediator that extends the communication range by relay[ing] signals between the transponder and receiver, enabling operation beyond the direct coupling distance while maintaining communication reliability.
2Reliability
If close proximity between transponder and receiver is maintained, then effective wireless communication is achieved, but this constraint cannot be satisfied in industrial environments where equipment is physically positioned distant from each other
Solution Approach 1:
The extender circuit serves as a mediator that decouples the proximity requirement between the transponder and receiver. By introducing the extender circuit with its first tank circuit connected to the transponder and second tank circuit connected to the receiver, the system enables effective communication over extended distances, allowing equipment to be positioned flexibly in industrial environments without requiring close proximity between the transponder and receiver.
3Reliability
If unobstructed line-of-sight between transponder and receiver is ensured, then successful RFID operation is achieved, but this condition cannot be met when transponder is positioned around corners relative to the receiver
Solution Approach 1:
The extender circuit acts as an intermediary that enables signal transmission around obstructions such as corners. The first tank circuit couples to the transponder, the coupling element transmits the signal, and the second tank circuit couples to the receiver, allowing the signal path to navigate around physical obstructions and maintain RFID operation in environments where direct line-of-sight is blocked.
4Device complexity
If passive transponder design is used, then device simplicity and cost are improved, but the transponder must be powered largely or exclusively by the electromagnetic signal from the receiver, limiting operational range
Solution Approach 1:
The extender circuit serves as an intermediary that extends the power and signal range for passive transponders. The first tank circuit coupled to the transponder receives electromagnetic signals from the extender circuit's second tank circuit, enabling the passive transponder to operate at extended distances without requiring additional power sources, thus maintaining device simplicity while increasing operational range.
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 facilitates reliable wireless communication between RFID devices even when they are not in close proximity and lack a direct line-of-sight, effectively extending the communication range and accommodating complex environments.
Implementation Method 1
an RFID transponder is in wireless communication with a RFID receiver and, by virtue of such wireless communication, identification information can be communicated between the two devices
Implementation Method 2
a first tank circuit including a first inductor connected in parallel with a first capacitor between first and second nodes
Data Source
AI summary
Systems and methods for extending the range of radio frequency identification (RFID) signal communications, including related sensing systems, are disclosed. In one embodiment, the system facilitates wireless communications between a RFID reader device and RFID transponder device and includes an extender circuit. The extender circuit includes a first tank circuit including a first inductor connected in parallel with a first capacitor between first and second nodes, and a second tank circuit including a second inductor connected in parallel with a second capacitor between third and fourth nodes. The extender circuit includes a first connection including a resistor, the first connection linking the first and third nodes, and a second connection between the second and fourth nodes, where the second and fourth nodes are at or substantially at a common voltage. In at least some additional systems, the extender circuit is implemented in combination with an RFID reader or transponder device.