RFID Antenna Polarization Switching for Stable Sheet Tag Reading
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Solution Overview
Problem
Existing wireless tag communication devices face instability in communication with sheets containing multiple wireless tags due to the dependence on specific polarized wave orientations, which vary by position, leading to inconsistent radio wave reception.
Innovation Solution
The implementation of a wireless tag communication device equipped with an antenna capable of switching polarization direction, along with units to acquire maximum and minimum received power intensity values for both polarization directions, determines the optimal polarization direction for stable communication by comparing these values to ensure consistent radio wave transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed polarization direction is used for radio wave transmission, then the device complexity is reduced, but communication reliability deteriorates due to position-dependent polarization requirements of wireless tags
Solution Approach 1:
The antenna polarization direction is changed from fixed to dynamically switchable between first and second polarization directions. The wireless tag communication device switches the polarization direction of the radio wave transmitted to the sheet according to the position of the sheet, enabling adaptation to different tag orientations while maintaining communication reliability.
Solution Approach 2:
The polarization direction parameter of the transmitted radio wave is changed based on the detected sheet position. By adjusting this physical parameter dynamically, the system optimizes communication with wireless tags at different positions on the sheet without increasing overall device complexity.
2Ease of operation
If radio waves are transmitted without considering polarization direction, then the ease of operation is improved, but communication reliability deteriorates due to inconsistent received power intensity
Solution Approach 1:
The system performs preliminary detection of the sheet position before transmitting communication radio waves. Based on the detected position, the antenna pre-adjusts the polarization direction to match the optimal orientation for tags at that position, ensuring reliable communication from the start of the transmission process.
Solution Approach 2:
The system uses feedback from sheet position detection to control the antenna polarization direction. The detected position information feeds back to the polarization control mechanism, which adjusts the transmission polarization accordingly, creating a closed-loop system that maintains communication reliability.
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 approach enables stable communication with multiple wireless tags on a sheet by determining the polarization direction that maximizes received power intensity, thereby ensuring reliable data transmission across varying tag configurations.
Implementation Method 1
The antenna switches a polarization direction of a radio wave transmitted to a wireless tag
Data Source
AI summary
A wireless tag communication device includes an antenna, a first maximum value acquiring unit, a second maximum value acquiring unit, a first minimum value acquiring unit, a second minimum value acquiring unit, and a polarization direction determining unit. The wireless tag communication device acquires, for each of n wireless tags provided on a sheet, a maximum value M1(k) of a received power intensity of the wireless tag when the radio wave is transmitted from the antenna to the sheet in a first polarization direction; acquires, for each of the wireless tags, a maximum value M2(k) of a received power intensity of the wireless tag when the radio wave is transmitted from the antenna in a second polarization direction that is different from the first polarization direction; acquires a minimum value m1 of M1(k); acquires a minimum value m2 of M2(k); and determines the polarization direction along which one of m1 and m2 that is not smaller is acquired as the polarization direction of the radio wave transmitted to the sheet.