RFID Textile Label Antenna Layout for Near- and Far-Field Reading
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Solution Overview
Problem
Existing RFID textile labels are not suitable for short distances due to their limited range, as they primarily use E-field antennas that are not effective for close-range applications.
Innovation Solution
The integration of a loop antenna with the RFID chip connected directly or indirectly, forming both H-field and E-field antennas, allowing for a combination of close-range and long-range functionality by utilizing magnetic and electric waves respectively, with the H-field antenna responsive to magnetic waves and the E-field antenna responsive to electric waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If an E-field antenna is used in the RFID textile label, then the long-range communication capability is improved, but the short-range communication capability deteriorates
Solution Approach 1:
The patent combines both E-field antenna and H-field antenna into a single RFID textile label system. The E-field antenna (dipole antenna) provides long-range communication capability, while the H-field antenna (loop antenna) provides short-range communication capability. By merging these two antenna types, the system achieves both long-range and short-range communication functions simultaneously, resolving the contradiction between long-range capability and short-range suitability.
2Adaptability or versatility
If a loop antenna is added to provide H-field functionality, then the short-range capability is improved, but the device complexity increases
Solution Approach 1:
The RFID textile label is designed with multi-functionality by incorporating both E-field and H-field antenna configurations. The same RFID chip can communicate with both types of antennas, allowing the system to serve multiple communication range requirements (short-range and long-range) with a single device, thereby achieving versatility without proportionally increasing complexity.
Solution Approach 2:
The antenna system is segmented into two functional parts: an E-field antenna (dipole) for long-range communication and an H-field antenna (loop) for short-range communication. Each antenna type is optimized for its specific communication range, and both are integrated into the same textile label structure. This segmentation allows each component to specialize in its optimal performance area while working together as a unified system.
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 enables an RFID textile label with a close-range capability of less than 1 meter and a long-range capability of up to 10 meters, effectively addressing the limitations of existing RFID textile labels by providing both near-field and far-field communication ranges.
Implementation Method 1
the H-field antenna is primarily responsive to magnetic waves
Implementation Method 2
the E-field antenna is primarily responsive to electric waves
Implementation Method 3
It draws its electrical energy for receiving and transmitting from the electromagnetic waves
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to an RFID textile label, having an open antenna (4) disposed on a carrier (2), wherein the antenna is connected to an RFID chip (12) at the center region. In order to make the RFID textile label suitable both for long range and close range, the antenna (4) comprises a loop (6) in the center region, the RFID chip (12) being connected either directly or indirectly to the shoulders (8, 10) of this loop, wherein the antenna loop (6) equipped with the RFID chip serves as an H field antenna, and the antenna sections (16, 18) disposed outside of the antenna loop serve as an E field antenna.