Magnetic Induction Module for Low-Frequency Signal Detection
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Solution Overview
Problem
Existing mobile phone solutions for short-distance communication using radio-frequency SIM/TF cards face challenges in accurately controlling and transmitting low-frequency signals, which affects communication reliability and efficiency, especially in applications like mobile payments where precise distance control is crucial.
Innovation Solution
An apparatus integrating a magnetic induction module and a low-frequency signal processing module on a Printed Circuit Board (PCB) for detecting and transmitting low-frequency signals, utilizing a magnetic induction coil connected to the low-frequency signal processing module to enhance signal reception and interference resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If radio-frequency SIM/TF card is used for short-distance communication, then communication convenience is improved, but transmission distance control precision deteriorates
Solution Approach 1:
The system separates low-frequency magnetic field communication (for distance control) from RF communication (for data transmission). The low-frequency module independently detects magnetic field strength to determine distance, while the RF module handles high-speed data transfer, allowing precise distance control without compromising communication convenience
Solution Approach 2:
A low-frequency magnetic field is introduced as an intermediary carrier for distance information. The magnetic field strength varies with distance from the reader, providing a reliable distance metric that enables precise control of transmission range while maintaining the convenience of contactless communication
2Volume of moving object
If low-frequency signal processing module and magnetic induction module are integrated on PCB, then device miniaturization is achieved, but signal detection precision may deteriorate
Solution Approach 1:
The magnetic induction coil is positioned at specific locations on the PCB (edges or corners) to maximize its area and magnetic field sensitivity. The low-frequency signal processing module is placed away from the coil to minimize interference, creating optimal local conditions for each component's function while maintaining compact integration
Solution Approach 2:
The low-frequency magnetic field serves as an intermediary that couples the external environment with the integrated circuit components. The magnetic induction coil converts magnetic field variations into electrical signals that the processing module can detect, enabling precise distance measurement within the compact integrated structure
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 enables accurate low-frequency signal detection and transmission, facilitating reliable short-distance communication and miniaturization of mobile phone components, thereby improving communication reliability and efficiency in mobile payment transactions.
Implementation Method 1
a magnetic induction module for inducing low-frequency magnetic signal
Data Source
AI summary
An apparatus for low-frequency signal detection and transmission in a short-distance communication field comprises: a PCB, a magnetic induction module for inducing low-frequency magnetic signal, and a low-frequency signal processing module for detecting low-frequency signal, the magnetic induction module and the low-frequency signal processing module being integrated onto the PCB. The magnetic induction module is connected with the low-frequency signal processing module. The PCB can be a SIM card PCB, a Micro-SIM card PCB, a TF card PCB, a SD card PCB, or a UIM card PCB, etc. This invention realizes low-frequency signal detection and transmission function of a SIM card, a TF card, a SD card, a UIM card, or any of other various memory cards mounted in a mobile phone.