RFID Reader Power Divider and Sensor Control
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Solution Overview
Problem
RFID readers face challenges in maintaining efficient operation and reliability due to varying communication environments and power consumption issues, leading to decreased recognition rates and reliability in tag signal recognition.
Innovation Solution
The RFID reader includes an RFID module for generating RF signals, a power divider to distribute these signals to multiple directional antennas, a sensor for detecting objects, and optional components like a tag power detector and power detector to manage power and signal distribution, with an antenna moving unit for adjusting signal direction to maintain uniform coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the RFID reader continuously transmits RF signals to maintain recognition coverage, then the recognition distance and coverage are improved, but the power consumption increases
Solution Approach 1:
The RFID reader transmits RF signals periodically rather than continuously. The control unit activates the RFID module to generate RF signals only during predetermined time intervals when objects are detected by the sensor, and deactivates it during intervals when no objects are present. This periodic transmission maintains recognition coverage when needed while significantly reducing power consumption during idle periods.
2Device complexity
If the RFID reader uses a single antenna to reduce device complexity, then the device complexity is reduced, but the uniformity of RF signal coverage deteriorates
Solution Approach 1:
The RFID reader employs multiple antennas instead of a single antenna to segment the RF signal transmission. Each antenna transmits RF signals in different directions or zones, creating overlapping coverage areas that collectively provide uniform recognition coverage throughout the predetermined area. This segmentation of the transmission function across multiple antennas ensures consistent signal distribution without requiring complex directional control mechanisms.
3Reliability
If the RFID reader processes all received tag signals to ensure high recognition rate, then the recognition rate is improved, but the processing time and computational resources increase
Solution Approach 1:
The control unit applies partial processing to received tag signals by first evaluating basic criteria such as signal power levels and validity thresholds. Only signals that meet these initial criteria undergo full processing and analysis. This selective processing approach maintains high recognition rates for valid signals while reducing unnecessary processing time and computational resources spent on invalid or low-quality signals.
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 enhances recognition distance, reduces power consumption, and improves reliability by optimizing RF signal distribution and coverage, minimizing duplicate tag recognition and noise processing, while ensuring efficient operation across different environments.
Implementation Method 1
The RFID reader includes an internal or external antenna, and this antenna emits an RF signal to form an electromagnetic field, that is, an RF field
Implementation Method 2
a power divider configured to divide the generated RF signal into a plurality of RF signals having a same power
Implementation Method 3
a sensor configured to detect an object within a predetermined area and transmit a result of the detection of the object to the RFID module
Data Source
AI summary
A radio frequency identification (RFID) reader includes an RFID module configured to generate a radio frequency (RF) signal, a power divider configured to divide the generated RF signal into a plurality of RF signals having a same power, at least one antenna configured to transmit the divided RF signals, and a sensor configured to detect an object within a predetermined area and transmit a result of the detection of the object to the RFID module.