Dual-Frequency RFID Shared Memory for LF/HF Reader Compatibility
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Solution Overview
Problem
Existing RFID systems face challenges in enabling seamless communication between low frequency (LF) and high frequency (HF) RFID readers due to frequency interference and material blocking, limiting data accessibility and cloud connectivity.
Innovation Solution
A dual frequency RFID device with two interfaces operating at different frequencies, sharing a memory accessible through both interfaces, allowing communication with both LF and HF readers, and incorporating a controller to manage data transmission across these frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single frequency RFID device is used, then the device structure is simple, but it cannot communicate with both LF and HF readers
Solution Approach 1:
The patent combines LF and HF antenna interfaces into a single RFID device, allowing the device to communicate with both low frequency and high frequency readers. The controller integrates both frequency interfaces and manages data transmission across different frequencies, enabling one device to replace multiple single-frequency devices.
Solution Approach 2:
The RFID device is designed with multi-functionality to operate at both low frequency and high frequency bands. The shared memory can be accessed by either frequency interface, and the controller can transmit data through either antenna, making the device universally compatible with different reader types without requiring separate dedicated devices.
2Reliability
If frequency interference and material blocking are present, then communication reliability decreases, but using a dual frequency device allows communication to proceed
Solution Approach 1:
The patent changes the operating frequency parameter to adapt to different communication environments. When LF readers are used, the device transmits at low frequency; when HF readers are used, it transmits at high frequency. This parameter change allows the device to overcome frequency interference and material blocking issues specific to certain frequency bands.
3Adaptability or versatility
If data is stored in a single memory accessible by one interface, then the device structure is simple, but data accessibility is limited
Solution Approach 1:
The patent implements a shared memory structure that can be accessed by both LF and HF interfaces. The controller manages data requests from either frequency interface and retrieves data from the shared memory accordingly. This allows data to be accessible through either interface without requiring separate memory spaces, maintaining simplicity while enabling universal access.
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
Enables seamless data access and cloud connectivity regardless of the reader type, enhancing data accessibility and compatibility with both modern and legacy systems.
Implementation Method 1
a first antenna configured to receive and transmit (e.g., communicate) at a first frequency
Implementation Method 2
a second antenna configured to receive and transmit (e.g., communicate) at second frequency, different from the first frequency
Data Source
AI summary
Techniques are described to provide improved connectivity for low frequency (LF) and high frequency (HF) radio-frequency identification (RFID) applications. In particular, a dual frequency RFID device is configured with two interfaces that communicate at different frequencies and which includes a shared memory, at least part of which can be accessed through both of the two interfaces. As such, existing LF RFID readers can communicate with the dual frequency RFID device via one interface, and HF RFID readers can communicate with the RFID device via the other interface. In some implementations, the same data in the shared memory can be accessed through either interface, allowing the same dual frequency RFID device to be accessed irrespective of whether the RFID reader is a LF RFID reader or a HF RFID reader.