RFID Antenna Phase-Synchronized Response for 125 kHz Miniaturization
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Solution Overview
Problem
RFID cards with a resonance frequency of 125 kHz require larger antennas for sufficient energy and signal amplitude, making them unsuitable for small devices due to size constraints.
Innovation Solution
A signal transceiving device with an antenna coil of 13.56 MHz resonance frequency, combined with amplification and analog-to-digital conversion circuits, enables the reception and transmission of 125 kHz signals, allowing the RFID card to operate effectively in small devices by amplifying the carrier signal and encoding response data based on signal characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antenna with larger size is used for 125 kHz RFID cards to ensure sufficient energy and signal amplitude, then the signal quality and energy sufficiency are improved, but the device size increases making it unsuitable for small devices
Solution Approach 1:
The patent changes the operating frequency parameter from 125 kHz to 13.56 MHz, which allows the use of a smaller antenna while maintaining sufficient signal quality and energy levels. This parameter change fundamentally resolves the contradiction between signal reliability and device miniaturization.
Solution Approach 2:
The patent introduces an amplification circuit as an intermediary component that boosts the received signal strength at 13.56 MHz, compensating for any potential signal weakness and ensuring reliable operation without requiring a large antenna structure.
2Volume of moving object
If the antenna frequency is changed from 125 kHz to 13.56 MHz to enable miniaturization, then the device size is reduced for suitability in small devices, but compatibility with existing 125 kHz systems must be maintained
Solution Approach 1:
The patent designs the RFID card to operate at 13.56 MHz while incorporating signal processing capabilities that maintain compatibility with 125 kHz reader systems. The card can function as a universal RFID tag that works with both frequency standards, ensuring adaptability across different system environments.
Solution Approach 2:
By changing the antenna resonance frequency to 13.56 MHz, the patent enables the use of smaller antenna dimensions while the signal processing circuitry is designed to maintain compatibility with existing 125 kHz reader systems through appropriate signal conditioning and modulation techniques.
3Reliability
If signal amplification is applied to maintain signal strength with smaller antenna, then the signal amplitude is sufficient for proper operation, but the device complexity increases due to additional amplification and conversion circuits
Solution Approach 1:
The patent introduces an amplification circuit as an intermediary component that boosts the received signal strength at 13.56 MHz, compensating for any potential signal weakness and ensuring reliable operation without requiring a large antenna structure.
Solution Approach 2:
The patent replaces the need for large physical antenna structures with electronic signal processing solutions, including amplification and analog-to-digital conversion circuits, to achieve the same signal reliability goal through electronic means rather than mechanical (physical size) means.
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 solution allows RFID cards to be miniaturized while maintaining functionality, enabling suitable operation in small devices by using a smaller antenna coil with 13.56 MHz resonance frequency, which receives and transmits 125 kHz signals effectively, ensuring compatibility and cost savings through integrated card reader and chip modes.
Implementation Method 1
the antenna coil is configured to receive a carrier signal with a frequency of 125 KHz
Implementation Method 2
the amplification circuit is electrically connected with the second DC blocking circuit at the input end of the amplification circuit, and configured to amplify the carrier signal
Implementation Method 3
the analog-to-digital conversion circuit is electrically connected with the output end of the amplification circuit at an input end of the analog-to-digital conversion circuit, and configured to perform analog-to-digital conversion on the carrier signal amplified by the amplification circuit
Implementation Method 4
an antenna coil with a resonance frequency of 13.56 MHz
Implementation Method 5
an antenna coil with a resonance frequency of 13.56 MHz
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present invention provides a card read response method, apparatus, and system, and a signal transceiving device. The method comprises: receiving a carrier signal having a frequency of 125 KHz by using an antenna having a resonance frequency of 13.56 MHz; amplifying the carrier signal, and performing analog-to-digital conversion on the amplified signal to obtain a digital signal; acquiring signal characteristics of the carrier signal according to the digital signal, the signal characteristics comprising at least a frequency and a phase; and encoding response data at the frequency of the carrier signal to obtain an encoded signal, determining an initial phase of the outputted encoded signal according to the phase, and outputting the encoded signal via the antenna so that the encoded signal and the carrier signal are superimposed at the same phase. According to the signal response method, apparatus, and system of the present invention, a small antenna having a resonance frequency of 13.56 MHz can be used to send and receive a signal having a frequency of 125 KHz, so as to meet the demand for device miniaturization.