Movable RFID Antenna Elements for Orientation-Independent Communication
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Solution Overview
Problem
RFID systems face challenges in maintaining effective communication between linearly or circularly polarized RFID tags and linearly polarized RFID reader/writers, particularly due to orientation issues and signal strength degradation, which limits read zones and requires multiple antennas or sequences for optimal reading.
Innovation Solution
A pair of movably connected antenna elements in an RFID reader/writer that can adjust from parallel to orthogonal configurations, allowing for independent operation or combined action to radiate linear or circular polarized waves, ensuring reliable communication regardless of tag orientation and minimizing antenna size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If omnidirectional circularly polarized antennas are used in RFID tags to ensure power transfer independent of orientation, then communication reliability with linearly polarized reader/writer antennas is improved, but the antenna size increases making it difficult to attach to small items
Solution Approach 1:
The patent applies dynamics by making the reader/writer antenna elements movable relative to each other, allowing the antenna configuration to adapt dynamically between parallel and orthogonal positions. This enables the system to adjust to different tag orientations without requiring large fixed omnidirectional antennas in tags, thus maintaining communication reliability while keeping tag antenna size small.
Solution Approach 2:
The patent changes the parameter of antenna orientation by allowing the reader/writer antenna elements to move between parallel and orthogonal configurations. This parameter change enables the system to optimize power transfer for different tag antenna orientations, achieving reliable communication with small linearly polarized tag antennas rather than requiring large circularly polarized antennas.
2Area of stationary object
If multiple antennas or antenna pairs are used in RFID reader/writer to cover all reading locations, then read zone coverage is improved, but device complexity and configuration requirements increase
Solution Approach 1:
The patent uses dynamics by implementing movable antenna elements that can change their relative orientation from parallel to orthogonal. This dynamic adjustment allows a single antenna device to effectively cover multiple reading zones and orientations that would otherwise require multiple fixed antennas, thereby improving read zone coverage while reducing device complexity and eliminating the need for complex multi-antenna configurations.
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 solution enhances reading and writing efficiency by accommodating various tag orientations and sizes, maintaining a compact reader/writer design while ensuring reliable communication with both linear and circular polarized tags, independent of their orientation.
Implementation Method 1
a reader/writer needs a transmitting antenna to convert a voltage created by the reader/writer to an electromagnetic wave that is transmitted as a radio signal to a tag
Implementation Method 2
Any reflection, diffraction or absorption changes the read zone
Implementation Method 3
Any reflection, diffraction or absorption changes the read zone
Implementation Method 4
Any reflection, diffraction or absorption changes the read zone
Data Source
AI summary
An antenna device that includes a pair of antenna elements for an RFID reader/writer to communicate information with an RFID tag is provided. The antenna elements are movably connected to each other so that one of the antenna elements is configured to intensify the other of the antenna elements to radiate radio wave. The antenna device has at least operation modes, where the antenna elements are in parallel to each other and where the antenna elements are orthogonal to each other. The RFID reader/writer device includes such a pair of antenna elements.