Multibeam Antenna Directional Switching for RFID Positioning
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Solution Overview
Problem
Current RFID systems face challenges in accurately determining the position and direction of transponders due to limitations in directional information, especially with single-terminal readers and existing RSSI-based methods, which often result in low resolution and ambiguity, and require complex antenna configurations and high installation efforts.
Innovation Solution
A device comprising a multibeam antenna with switchable directional characteristics, a signal processing unit, and a data processing unit that receives signals with different directional sensitivities, processes amplitude values, and determines the position of transponders based on these characteristics, allowing for precise direction estimation using RSSI values without phase information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antennas are distributed spatially to determine transponder position, then directional information can be established, but the installation effort and space requirements increase significantly
Solution Approach 1:
The patent combines multiple antenna functions into a single antenna device with multiple switchable directional characteristics. Instead of distributing multiple physical antennas in space, the invention integrates multiple directional patterns (beam formations) that can be switched electronically, thereby achieving spatial localization without the physical complexity of multiple distributed antennas.
Solution Approach 2:
The patent employs dynamic switching between different directional characteristics of the antenna device. The antenna can change its radiation pattern dynamically to scan different spatial directions, allowing the system to determine transponder position by sequentially activating different directional beams and measuring signal strengths, rather than requiring static multiple antennas.
2Measurement precision
If sequential switching between multiple antennas is used to determine position, then directional information can be obtained, but the directional accuracy becomes ambiguous and resolution is poor
Solution Approach 1:
The patent assigns different local directional characteristics to different switching states of the antenna device. Each directional characteristic is optimized for a specific spatial sector or direction, allowing the system to achieve high directional accuracy in each local region by selecting the appropriate beam pattern for that direction.
3Device complexity
If conventional RFID readers with single terminal are used, then system simplicity is maintained, but position determination capability is lost
Solution Approach 1:
The patent enables a conventional single-terminal RFID reader to perform both identification and localization functions by integrating a multibeam antenna system. The antenna device with switchable directional characteristics allows the reader to determine transponder position in addition to its standard identification capability, thereby achieving multi-functionality without replacing the entire reader system.
4Measurement precision
If high directivity antennas are used to improve direction estimation accuracy, then position determination precision increases, but the system complexity and cost increase
Solution Approach 1:
The patent uses periodic switching between different directional characteristics of the antenna device to scan through various spatial directions. By systematically cycling through different beam patterns and measuring signal strengths at each direction, the system can determine transponder position with high accuracy through temporal sampling rather than requiring complex simultaneous multi-antenna processing.
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 enables accurate and unambiguous direction finding of transponders, reducing the dependency on individual antenna directivity and infrastructure complexity, while using conventional RFID readers and providing a compact, cost-effective solution for various applications.
Implementation Method 1
the antenna device is configured to receive at least one respective signal from the transmitter with different directional characteristics
Data Source
AI summary
What is disclosed is a device for determining a piece of information on a position of a transmitter, comprising an antenna device, a signal processing device and a data processing device. Thus, the antenna device comprises several different directional characteristics, the directional characteristics each relating to at least a set of spatially different receive sensitivities of the antenna device. The antenna device receives signals from the transmitter with different directional characteristics, the signal processing device processing the signals received and establishing a respective amplitude value of a field strength. The data processing device establishes the information on the position of the transmitter based on the directional characteristics and the amplitude values having been established for the associated signals received. Additionally, a corresponding method is disclosed.