RFID Shelf Cabling with Single Cable Antenna Control
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Solution Overview
Problem
Existing RFID shelf systems face challenges with complex cabling, high material and personnel costs, and limited design flexibility due to the need for multiple antennas and multiplexers, which complicates the connection and power supply of RFID antennas across multiple shelves.
Innovation Solution
A compact and modular RFID shelf system with a single cable connection for all antennas, using a sequential wiring structure with one read/write unit and individual antenna control, reducing cabling and allowing precise transponder localization across multiple shelves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple antennas and multiplexers are used to cover multiple shelves, then the detection coverage is improved, but the cabling complexity and material costs increase
Solution Approach 1:
The patent combines multiple antenna connections into a single cable by using a daisy-chain topology where antennas are sequentially connected along one cable run. This merging approach maintains detection coverage across multiple shelves while eliminating the need for separate cables to each antenna, thus reducing cabling complexity and material costs.
Solution Approach 2:
The single cable serving each shelf is designed to perform multiple functions: providing power to multiple antennas, carrying RF signals for detection, and enabling sequential addressing of different antennas. This multi-functional design replaces the traditional separate cable architecture, reducing overall system complexity while maintaining full detection coverage.
2Measurement precision
If multiple read/write units are deployed on different shelves, then the localization precision is improved, but the system costs and operational complexity increase
Solution Approach 1:
The patent introduces a sequential switching mechanism as an intermediary between the single read/write unit and multiple antennas. This switch enables the single read/write unit to time-division multiplex between different antennas, achieving precise localization through sequential activation while avoiding the need for multiple simultaneous read/write units.
Solution Approach 2:
The system employs periodic activation of different antennas in a sequential manner, where each antenna is activated in turn for a specific time period. This periodic action allows a single read/write unit to achieve the localization precision that would otherwise require multiple simultaneous units, while significantly reducing system complexity.
3Reliability
If traditional separate cable connections are used for each antenna, then the signal transmission reliability is maintained, but the assembly and maintenance costs increase
Solution Approach 1:
The patent segments the cable connection into modular sections that can be independently assembled and replaced. Each shelf unit has defined input and output connection points, allowing for modular assembly while maintaining reliable signal transmission through standardized interfaces.
Solution Approach 2:
The cable architecture is designed with a nested structure where the single cable run passes through multiple shelves in sequence, with antennas and connection points nested along the cable path. This nested arrangement simplifies assembly by reducing the number of cable routing operations required while maintaining reliable connections to all antennas.
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 significantly reduces manufacturing, maintenance, and assembly costs while enabling precise transponder localization and orientation-independent detection, simplifying the design and operation of the RFID system across multiple shelves.
Implementation Method 1
The energy and data transmission is based on the magnetic coupling of the alternating fields of the reader and the transponder in the immediate vicinity of the antenna
Implementation Method 2
The antenna coil and the resonant capacitor form an electrical resonant circuit and are tuned to their operating frequency
Data Source
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AI summary
The invention relates to a shelf or cabinet with at least two shelves, in which at least one RFID antenna is arranged in each shelf, in which: - the shelf or cabinet has only one read/write unit, - the single read/write unit is configured to control all antennas in all shelves of the shelf or cabinet, - between the read/write unit and a first antenna in a first shelf and between all antennas of the shelf or cabinet, only a single-core connecting cable with only one signal line is provided, through which signals can be transmitted, - and the signal line is simultaneously provided for a power supply. (Fig. 6).