Vehicle Antenna Passive Selection Circuit for HF and NFC Signals
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Solution Overview
Problem
Existing vehicle communication devices face challenges in integrating both high-frequency and near-field radiofrequency signals due to space constraints, cross-interference, and power consumption issues, leading to degraded signal quality.
Innovation Solution
A communication device with a single antenna, a matching circuit, and a passive selection circuit that switches between high-frequency and near-field signals based on signal strength, using a transistor and diode configuration to direct signals to appropriate processing modules without requiring a separate power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both high-frequency and near-field circuits are integrated into a single device with separate antennas, then both signal types can be received, but space is excessive and cross-interference occurs
Solution Approach 1:
The patent combines both high-frequency and near-field communication circuits into a single device with a shared antenna structure. The antenna assembly includes both HF and NFC antennas integrated in one unit, eliminating the need for separate antenna modules and reducing overall device space while maintaining dual functionality.
Solution Approach 2:
The patent introduces a passive selection circuit as an intermediary component that automatically routes received signals to the appropriate processing module. This circuit detects signal type and activates only the relevant circuit (HF or NFC), preventing cross-interference between the two communication systems while sharing the same antenna structure.
2Area of stationary object
If a single circuit is used for both high-frequency and near-field emissions, then space and cross-interference problems are solved, but signal quality is degraded
Solution Approach 1:
The passive selection circuit acts as an intermediary that receives signals from the shared antenna and directs them to the appropriate processing circuit. It uses signal detection to determine whether the received signal is HF or NFC type, then activates only the corresponding circuit, ensuring optimal signal quality for each communication type while sharing the antenna structure.
Solution Approach 2:
The patent implements dynamic circuit activation where the HF or NFC circuit is activated based on the detected signal type. The passive selection circuit continuously monitors incoming signals and dynamically switches between activating the HF processing circuit or the NFC processing circuit, ensuring that only the relevant circuit is active at any given time to maintain signal quality.
3Area of stationary object
If a smart circuit with permanent power supply is used to detect and activate corresponding components, then space and cross-interference are solved, but device life is reduced due to increased power consumption
Solution Approach 1:
The passive selection circuit is designed to be powered passively by the received RF signals themselves, eliminating the need for a separate permanent power supply. The circuit automatically detects signal type and activates the appropriate processing module without requiring continuous power consumption, thereby extending device battery life while maintaining the benefits of integrated design.
Solution Approach 2:
The selection circuit operates periodically by detecting signal presence and type only when needed, rather than continuously consuming power. It activates the appropriate processing circuit on-demand based on received signal characteristics, minimizing power consumption while maintaining the ability to handle both HF and NFC communications.
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 device efficiently receives and processes both high-frequency and near-field signals while maintaining compact size and low power consumption, reducing interference and signal degradation.
Implementation Method 1
configured to communicate with a near-field communication module so that said near-field communication module receives signals via the antenna, to operate in an open circuit when the strength of the signals received by the antenna is below a predetermined strength threshold, and to transfer the signals received by the antenna to the near-field communication module via the matching circuit when the strength of said signals is above the predetermined strength threshold
Implementation Method 2
a matching circuit configured to match the impedance of said antenna
Data Source
AI summary
A communication device for a vehicle, including a single communication antenna, a matching circuit configured to match the impedance of the communication antenna, a high-frequency processing module connected to the matching circuit and configured to process high-frequency signals received by the antenna, and a passive selection circuit connected to the matching circuit and configured to communicate with a near-field communication module which receives signals via the antenna, to operate in an open circuit when the strength of the signals received by the antenna is below a predetermined strength threshold, and to transfer the signals received by the antenna to the near-field communication module via the matching circuit when the strength of said signals is above the predetermined strength threshold.