Multi-element RFID Near Field Coupler for Selective Transponder Communication
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Solution Overview
Problem
Existing RFID systems face challenges in selectively communicating with a targeted transponder among multiple adjacent transponders, leading to communication errors and increased complexity, cost, and space constraints, particularly in applications like RF printer-encoders, where anti-collision management techniques and shielding components are not feasible.
Innovation Solution
A near field coupler system with a switching element and radiating elements that selectively activate and deactivate electromagnetic fields to create a localized communication pattern, allowing for targeted communication with transponders without the need for physical isolation or complex anti-collision techniques, and adapting to different transponder configurations and placements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If anti-collision management techniques are used to communicate with multiple transponders, then communication capability is improved, but system complexity and cost increase
Solution Approach 1:
The electromagnetic field is segmented into multiple localized regions using multiple radiating elements, each creating a distinct near field zone. This allows the system to address individual transponders in specific regions without activating others, achieving selective communication without complex anti-collision protocols.
Solution Approach 2:
Each radiating element creates a localized electromagnetic field with specific spatial characteristics tailored to illuminate particular transponder positions. The field distribution is optimized locally for each radiating element, enabling precise targeting of individual transponders among multiple adjacent ones.
2Object-affected harmful factors
If RF-shielded housing is used to isolate transponders, then multiple transponder activation is prevented, but cost and space requirements increase
Solution Approach 1:
Instead of using a single shielded housing, the system segments the electromagnetic field into multiple isolated near field regions using separate radiating elements. Each element's field is naturally confined to its local zone, providing transponder isolation without physical shielding structures.
Solution Approach 2:
The mechanical RF-shielded housing is replaced with an electromagnetic field-based solution using multiple radiating elements. The field confinement is achieved through electromagnetic near field characteristics rather than physical barriers, eliminating the need for bulky shielded enclosures.
3Measurement precision
If multiple radiating elements are used for selective transponder communication, then communication precision is improved, but device complexity increases
Solution Approach 1:
The communication system is segmented into multiple independent radiating elements, each responsible for a specific spatial zone. This segmentation enables precise targeting of individual transponders while maintaining relatively simple individual element designs that can be replicated.
Solution Approach 2:
The system dynamically activates or deactivates specific radiating elements based on the position of the target transponder. This dynamic control allows the system to maintain high communication precision by engaging only the necessary elements, reducing the effective complexity at any given moment.
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
The system enables selective communication with individual transponders, reducing errors and system complexity, while maintaining a limited electromagnetic field range to prevent activation of adjacent transponders, thus optimizing communication efficiency and cost-effectiveness in constrained environments.
Implementation Method 1
The near field coupler is structured to receive the communication signals from the transceiver and further adapted to broadcast electromagnetic signals into a transponder operating region
Implementation Method 2
A near field coupler system with a switching element and radiating elements that selectively activate and deactivate electromagnetic fields to create a localized communication pattern
Data Source
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AI summary
A near field coupler comprising: a dielectric substrate having a first surface, a second surface, a first end and a second end; a terminating resistor disposed on the dielectric substrate adjacent the second end; a ground plane adjacent to the second surface of the dielectric substrate, a plurality of radiating elements extending proximately from the first end to the second end of the dielectric substrate along the first surface; and a switching element electrically connected to the plurality of radiating elements adjacent to the first end of the dielectric substrate, wherein the switching element is adapted for electrical communication with a transceiver and configured to selectively deactivate one or more radiating elements among the plurality of radiating elements by decoupling from the one or more radiating elements.