RFID Tag Positioning via Multi-Antenna Segmentation
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Solution Overview
Problem
In RFID networks, readers cannot accurately detect the position of tags, leading to power wastage and unnecessary communication with tags within their coverage area.
Innovation Solution
A near field radio frequency communication system using a master RFID/USN device with multiple antennas to sequentially transmit energy signals and a slave RFID/USN device that detects power levels to determine position information, allowing the master device to accurately locate the slave device in sub-divided areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the reader periodically transmits information request signals to all tags in the coverage area, then the reader can maintain communication with tags, but power is wasted transmitting signals to tags that do not need communication
Solution Approach 1:
The coverage area is divided into multiple sub-divided areas using multiple antennas. Each antenna is responsible for a specific sub-area, allowing the system to segment the communication task and target only the relevant sub-area where a tag is detected, thereby reducing unnecessary power consumption while maintaining communication reliability.
Solution Approach 2:
The system transmits information request signals only to specific sub-divided areas where tags are detected, rather than uniformly to the entire coverage area. This localized approach reduces power waste while ensuring that tags in active areas receive communication signals reliably.
2Loss of information
If the reader communicates with all tags in the coverage area, then no tag is missed, but the reader cannot select the specific tag that is the other party of communication
Solution Approach 1:
The coverage area is segmented into multiple sub-divided areas corresponding to different antennas. By detecting which antenna receives the tag's response signal, the system can identify the specific sub-area and select the corresponding tag for communication, achieving both complete detection and precise selection without increasing overall system complexity.
Solution Approach 2:
Multiple antennas act as intermediaries to detect and identify tags in different sub-areas. The antenna that receives the tag's response signal serves as the mediator to determine which tag should be the communication partner, enabling selective communication while maintaining complete area coverage.
3Device complexity
If the reader uses a single antenna to transmit signals, then the system is simple, but the reader cannot accurately detect the position information of the tag
Solution Approach 1:
The single antenna is replaced with multiple antennas, each covering a specific sub-divided area. This segmentation allows the system to determine which sub-area contains the tag based on which antenna receives the response signal, thereby achieving accurate position detection while keeping the overall system structure relatively simple and scalable.
4Reliability
If the reader transmits continuous information request signals, then the reader maintains awareness of all tags, but power is wasted when no tag needs communication
Solution Approach 1:
Instead of continuous signal transmission, the system uses periodic information request signals targeted at specific sub-divided areas where tags are detected. This periodic action maintains tag monitoring capability while significantly reducing power consumption by activating transmission only when and where needed.
Solution Approach 2:
The system provides monitoring and communication services locally in specific sub-divided areas rather than uniformly across the entire coverage area. This localized approach maintains reliable tag monitoring in active areas while reducing power consumption by avoiding unnecessary transmissions in inactive areas.
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 precise detection of tag positions, preventing power wastage and allowing for efficient communication by distinguishing between active and waiting states of tags within the coverage area.
Implementation Method 1
a master RFID/USN device which comprises a plurality of antennas to sequentially shower an energy signal through the antennas
Implementation Method 2
a slave RFID/USN device which generates a first power using the energy signal
Data Source
Figure 1A~1D
Figure 2
Figure 3~4
AI summary
Disclosed is a near field radio frequency communication system. The near field radio frequency communication system comprising: a master RFID/USN device which comprises a plurality of antennas to sequentially shower an energy signal through the antennas; and a slave RFID/USN device which generates a first power using the energy signal, detects a power level of the first power, and transmits a information created based on the power level to the master RFID/USN device, wherein the master RFID/USN device creates a first position information of the slave RFID/USN device related to a direction by determining an antenna used to communicate with the slave RFID/USN device, and a second position information of the slave RFID/USN device related to a distance using the information created based on the power level.