Data Reader Antenna Phase Control for Radio Wave Interference
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Solution Overview
Problem
Existing data readers face challenges in reading data from radio IC tags due to interference from direct and reflected waves, leading to dead spots where data retrieval fails, especially when multiple readers and antennas interfere with each other.
Innovation Solution
A data reader system with multiple antenna units and a control unit that adjusts radiation characteristics, such as beam direction and phase, to avoid interference and change the occurrence of dead spots, ensuring data can be read regardless of the radio IC tag's location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple readers and antennas are provided to expand coverage area, then the coverage area is improved, but radio wave interference increases causing dead spots
Solution Approach 1:
The patent applies dynamics by making the radiation characteristics of antenna units changeable rather than fixed. The control unit dynamically adjusts beam direction, beam width, and other radiation parameters of each antenna unit based on real-time detection of dead spots and tag positions, allowing the system to adapt to changing interference conditions while maintaining expanded coverage area
Solution Approach 2:
The patent implements parameter changes by modifying physical parameters of antenna radiation such as beam direction angle, beam width, and radiation power. The control unit changes these parameters to move dead spots away from tag locations, thereby resolving the contradiction between maintaining large coverage area and preventing radio wave interference
2Reliability
If antenna radiation characteristics are changed to move dead spots, then data read reliability is improved, but system complexity increases
Solution Approach 1:
The patent applies feedback by implementing a closed-loop control system where the control unit detects dead spots and tag positions, then uses this information to adjust antenna radiation characteristics. This feedback mechanism ensures high data read reliability while managing system complexity through intelligent, adaptive control rather than overly complex hardware configurations
Solution Approach 2:
The control unit performs multiple functions including detecting dead spots, determining tag positions, calculating optimal beam directions, and controlling multiple antenna units. This multi-functionality reduces overall system complexity by consolidating control logic into a single intelligent unit rather than requiring separate specialized components for each function
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 effectively prevents data read failures by dynamically managing antenna radiation patterns, allowing for successful data retrieval even in areas with interference, and accurately designates the position of radio IC tags by adjusting for dead spots.
Implementation Method 1
a communicating antenna for transmitting data stored in the storage unit
Implementation Method 2
the control unit changes the phase of the radio waves radiated from the antenna units by sequentially driving the plurality of the antenna units
Implementation Method 3
reflected wave as radio waves for a read reflected by a wall, an article, etc. and direct waves of the radio waves for a read indicate inverse phases and interfere with one another
Data Source
AI summary
A data reader can read data regardless of the position of a radio IC tag. The data reader reads data at a separate position from a radio IC tag provided with a storage unit storing data and a communicating antenna for transmitting the data stored in the storage unit, and includes a reader/writer for generating a modulated signal by modulating a carrier wave and a plurality of antenna units for transmitting radio waves for a read for communicating data with a storage medium by radiating the modulated signal into the air. The reader/writer includes a phase adjustment circuit for changing the phase of a carrier wave.