Switchable Near-Field Far-Field Antenna for RFID Tracking
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Solution Overview
Problem
RFID systems face limitations due to the need for separate near-field and far-field antennas, which restrict their operational range and introduce blind spots, making it difficult to track assets and individuals effectively across varying distances and polarizations.
Innovation Solution
A switchable, oscillating antenna system that dynamically transitions between near-field and far-field configurations, using a subset of far-field antenna components to form a near-field antenna, allowing for enhanced tracking and prediction capabilities by oscillating between different antenna configurations to cover a broader range and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate near-field and far-field antennas are used, then each antenna can be optimized for its specific range, but the system complexity increases and blind spots are introduced
Solution Approach 1:
The patent combines near-field and far-field antenna elements into a single integrated antenna structure. The antenna includes a resonant element with specific geometric configurations that enable it to operate in both near-field and far-field modes, eliminating the need for separate antenna systems and reducing overall system complexity while maintaining tracking reliability across all ranges.
Solution Approach 2:
The antenna is designed as a universal structure that performs multiple functions - it operates as a near-field antenna for close-range tracking and as a far-field antenna for long-range tracking. The resonant element's geometry and switching mechanism enable it to adapt its operational mode based on the required tracking distance, providing multi-functionality within a single device.
2Device complexity
If a single antenna is used for both near-field and far-field operation, then device complexity is reduced, but the ability to maintain optimized performance in both ranges becomes challenging
Solution Approach 1:
The antenna incorporates a switching mechanism that dynamically changes the operational configuration of the resonant element based on the required tracking range. For near-field operation, the antenna activates specific portions of the resonant element with particular geometric configurations, while for far-field operation, it switches to different configurations. This dynamic adaptation maintains optimized performance in both ranges within a single antenna structure.
Solution Approach 2:
The resonant element is divided into multiple segments or portions with different geometric configurations. Each segment can be independently activated or deactivated based on the operational requirements. This segmentation allows the antenna to present different effective geometries for near-field and far-field modes, maintaining reliability in both ranges while using a single physical antenna structure.
3Measurement precision
If the antenna operates in fixed near-field mode, then close-range tracking is reliable, but far-field tracking capability is lost
Solution Approach 1:
The switching mechanism enables the antenna to transition between fixed near-field configuration and far-field configuration based on operational requirements. When close-range tracking is needed, the antenna activates the near-field optimized geometry for high precision. When long-range tracking is required, it switches to the far-field configuration, providing adaptability across the full operational range while maintaining precision in each mode.
4Adaptability or versatility
If the antenna operates in fixed far-field mode, then long-range tracking is enabled, but near-field tracking reliability deteriorates
Solution Approach 1:
The antenna system dynamically switches between far-field and near-field configurations. When operating in far-field mode for long-range tracking, the system maintains adaptability across ranges. When close-range tracking is required, it switches to the near-field configuration that provides optimized precision for short distances, thus resolving the trade-off between operational range and measurement precision.
Data Source
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AI summary
Disclosed is a system and method of a switchable, oscillating near-field and far-field antenna that may be used in access control systems. A controller is coupled to a transceiver, wherein the transceiver comprises an antenna module that includes both a near-field antenna and a far-field antenna. The near-field antenna is a subset of the far-field antenna, and the controller is adapted to cause the antenna module to oscillate between a near-field configuration and a far-field configuration while, for example, scanning an RFID tag of a wireless asset and receiving one or more return signals from the RFID tag, in order to determine a location of the wireless asset based on the one or more return signals.