RFID Reader Harmonic Signal Processing for Glare-Resistant Reading
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Solution Overview
Problem
Existing RFID communication systems face limitations in reading performance due to glare effects in environments with metal and high humidity, and require new transponders to process harmonic signals effectively.
Innovation Solution
A complementary communication device is coupled to an RFID reader to detect and process both fundamental and harmonic frequencies, using electronic circuits to convert harmonic signals back to the fundamental frequency for processing by the reader, without requiring new transponders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RFID readers process only fundamental frequency signals, then the system is simple and reliable, but reading performance deteriorates in environments with metal and high humidity due to glare effects
Solution Approach 1:
The patent segments the signal processing task by separating fundamental frequency processing from harmonic frequency processing. The reader is configured to process both the fundamental frequency (f0) and harmonic frequencies (nf0) of backscattered signals independently, allowing glare effect mitigation through harmonic signal analysis while maintaining conventional fundamental frequency processing capabilities.
Solution Approach 2:
The patent introduces a new dimension to signal processing by utilizing harmonic frequencies (multiples of the fundamental frequency) in addition to the fundamental frequency itself. This dimensional expansion allows the system to extract information from harmonic components that are less affected by glare effects, thereby improving reading performance in challenging environments.
2Reliability
If the system processes harmonic signals, then reading performance improves and robustness against glare effects increases, but device complexity increases due to additional electronic circuits and processing requirements
Solution Approach 1:
The patent implements multi-functionality by enabling the reader to perform both conventional fundamental frequency processing and new harmonic frequency processing using a unified signal processing architecture. The same reader hardware, with additional processing capabilities, can handle both signal types, avoiding the need for separate dedicated harmonic processing systems.
Solution Approach 2:
The patent utilizes parameter changes in frequency domain by analyzing signals at multiple frequency points (fundamental frequency and harmonic frequencies). The system adjusts its processing parameters to accommodate different frequency components, allowing the same physical infrastructure to handle varied signal characteristics without requiring fundamental hardware changes.
3Reliability
If new transponders are designed to process harmonic signals, then harmonic signal processing becomes effective, but device complexity and cost increase
Solution Approach 1:
The patent enables conventional transponders to serve the dual purpose of being interrogated at both fundamental and harmonic frequencies without requiring any modifications to the transponder itself. The transponder's existing backscattering mechanism naturally generates harmonic signals, which the enhanced reader then processes, making the system self-service friendly and avoiding transponder redesign.
Solution Approach 2:
Instead of modifying the transponder to enable harmonic processing, the patent inverts the approach by keeping the transponder simple and conventional while modifying the reader to process harmonic signals. This inversion shifts the complexity from the transponder side to the reader side, maintaining transponder simplicity while achieving harmonic processing capability.
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
Enhances reading performance by processing harmonic signals, improves robustness against glare effects, and equips conventional RFID readers with new functionalities through electronic and software processing.
Implementation Method 1
the reader transfers energy wirelessly to the transponder by sending a radiofrequency (RF) power
Implementation Method 2
the transponder of which can benefit, to obtain an electrical power supply to operate and respond to a certain frequency by using the backscattering modulation technique
Implementation Method 3
A rectifier then converts the alternating current generated by the RF waves sent by the direct current reader making it possible for the chip to perform the rest of its functions as a transponder
Data Source
AI summary
A novel RFID communication device is proposed which allows the detection and electronic processing not only of the response signal backscattered at the fundamental frequency f0 of the reader, but also at least one response signal backscattered at a harmonic frequency, before feeding them to the conventional receive chain of an RFID reader. The joint use of the signal at the fundamental frequency of the reader and at least one signal at a harmonic frequency allows the reader's performance to be improved. The RFID reader can additionally be provided with novel functionalities by virtue of suitable software processing. It is applicable to the field of communications between a reader and passive transponders in UHF RFID and to the field of the Internet of Things.