RF Tag Communication Device Voltage Suppression Circuit
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Solution Overview
Problem
Existing communication devices for RF tags face challenges in maintaining stable communication over a wide range without increasing communication time, due to limitations in signal reception voltage dynamic range and the need for repeated gain adjustments.
Innovation Solution
A communication device with a voltage suppression circuit that includes a suppressor to limit the signal intensity, using a pair of diodes and buffers to maintain the signal within a predetermined range, and an optional loss correction unit to compensate for signal suppression losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the antenna is installed in a position distant from the RF tag to maximize communicable distance, then the installation margin is improved, but the reception voltage becomes excessively low causing communication failure
Solution Approach 1:
The patent changes the parameter of reception gain dynamically based on signal strength detection. When the reception signal voltage exceeds a predetermined threshold, the reception gain is reduced; when it falls below the threshold, the reception gain is increased. This parameter adjustment ensures stable communication across varying distances without requiring retry processing.
2Reliability
If the antenna is installed near the RF tag to ensure sufficient reception voltage, then the reception voltage is improved, but the installation margin is reduced limiting communicable distance
Solution Approach 1:
The patent introduces dynamic adjustment of reception gain based on real-time signal strength detection. The system continuously monitors the reception signal voltage and automatically adjusts the reception gain accordingly, transforming a static system into a dynamic one that adapts to varying installation conditions and distances.
3Reliability
If retry processing is performed to ensure communication success, then the communication reliability is improved, but the communication time increases
Solution Approach 1:
The patent performs preliminary detection of signal strength before communication and proactively adjusts the reception gain in advance. By detecting whether the reception signal voltage exceeds the threshold and adjusting the gain beforehand, the system prevents communication failures before they occur, eliminating the need for time-consuming retry processing.
4Device complexity
If fixed amplification factor is used in reception amplifier, then the device complexity is reduced, but the adaptability to different distances is worsened
Solution Approach 1:
The patent implements a feedback mechanism where the detection unit monitors reception signal voltage and provides feedback to the control unit, which then adjusts the reception gain accordingly. This closed-loop feedback system enables the amplifier to adapt to different communication distances automatically while maintaining manageable device complexity through standardized control logic.
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 expands the communicable range without increasing communication time, improving stability by maintaining signal intensity within a demodulation possible dynamic range and compensating for signal losses, thus enhancing communication reliability.
Implementation Method 1
a suppressor configured to suppress the intensity of the amplified signal to be inputted into the detector such that the intensity does not exceed a predetermined upper limit
Implementation Method 2
The amplifier is electrically connected with the terminal and receives from the antenna a second radio signal generated by an RF tag receiving the first radio signal to amplify the second radio signal
Implementation Method 3
The transmitter is electrically connected with the terminal, generates a first radio signal superimposed with a predetermined command signal and transmits the first radio signal from the antenna
Implementation Method 4
The detector detects intensity of the signal having been amplified by the amplifier
Data Source
AI summary
There has been a demand for a technique of expanding a communicable range as much as possible without increasing the time required for communication between an RF tag and a communication device. A communication device includes: a terminal electrically connected with an antenna; a transmitter electrically connected with the terminal and configured to generate a first radio signal superimposed with a predetermined command signal and transmit the first radio signal from the antenna; an amplifier electrically connected with the terminal and configured to receive from the antenna a second radio signal generated by an RF tag receiving the first radio signal; a detector configured to detect intensity of the signal having been amplified by the amplifier; and a suppressor configured to suppress the intensity of the amplified signal to be inputted into the detector such that the intensity does not exceed a predetermined upper limit.