RF SIM Card Range Control via Magnetic Field Sensing
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Solution Overview
Problem
Existing RF communication technologies, particularly those using 13.56 MHz frequency, face challenges in achieving consistent communication ranges due to variations in mobile terminal structures, leading to interference and the need for complex calibration, which hinders secure and reliable short-range transactions like electronic payments.
Innovation Solution
The implementation of an RF device with a magnetic induction module and a microcontroller that operates in VHF, UHF, or SHF bands, using a magnetic signal detector to sense the magnetic field and adjust the communication range, allowing for secure and controlled communication by activating the transceiver module only when within the effective range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 13.56 MHz frequency is used for RF communication, then communication can be achieved, but communication range varies significantly due to different mobile terminal structures requiring calibration
Solution Approach 1:
The patent changes the operating frequency parameter from 13.56 MHz to VHF/UHF/SHF bands. This parameter change fundamentally alters the propagation characteristics, enabling consistent communication range across different mobile terminals without requiring calibration, as the higher frequencies are less affected by the shielding effects of various terminal structures.
Solution Approach 2:
The patent extracts the RF communication functionality from the mobile terminal's internal structure by using external antennas and a dedicated RF card reader. This separation removes the communication function from the terminal's shielding environment, allowing consistent RF communication range regardless of terminal structure variations.
2Ease of operation
If magnetic induction module is used to detect magnetic field, then communication range can be controlled, but device structure becomes more complex
Solution Approach 1:
The magnetic induction module serves multiple functions: it detects the presence of the RF card reader, determines communication range, and triggers the transceiver module activation. This multi-functionality consolidates several operations into a single module, managing device complexity while enabling precise range control.
Solution Approach 2:
The magnetic induction module provides feedback about the magnetic field strength and presence to the control unit, which then adjusts the transceiver module's operation accordingly. This feedback mechanism enables dynamic range control and ensures communication only occurs when within the effective range.
3Ease of operation
If transceiver module is activated continuously, then communication is always available, but power consumption increases
Solution Approach 1:
The transceiver module operates periodically rather than continuously. It is activated only when the magnetic induction module detects the presence of an RF card reader within the effective range. This periodic operation maintains communication availability when needed while significantly reducing power consumption during idle periods.
Solution Approach 2:
The magnetic induction module performs preliminary detection of the magnetic field and card reader presence before activating the transceiver module. This preliminary action ensures the transceiver is only activated when communication is actually needed, optimizing the balance between availability and power consumption.
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 enhances communication range control and security by reducing shielding effects, enabling consistent and reliable RF communication without the need for terminal-specific calibration, thus improving the usability of RF SIM cards in mobile devices for transactions.
Implementation Method 1
a magnetic induction module configured to sense a magnetic field signal from an RF card reader
Implementation Method 2
a magnetic field generation module configured to generate a magnetic field signal to activate the transceiver module
Data Source
AI summary
A radio frequency (RF) device includes an RF transceiver, an RF antenna, and a magnetic signal detector. The RF is selected to be in the very high frequency (VHF), ultrahigh frequency (UHF), or super high frequency (SHF) bands such that the shielding effect is reduced and the RF device can be configured as a SIM card disposed inside a cellular phone with an increased RF communication range. The magnetic signal detector is used to sense a magnetic field signal from an RF reader, which includes an RF transceiver, an RF antenna, and a magnetic signal transmitter. The longer communication range afforded by the VHF, UHF, or SHF bands is reduced by the sensing of the magnetic field, thereby providing a communication range control, while the RF device and the RF reader exchange information through the RF channel with improved security as a result of the range control.