Dual Antenna SAR Sensing for Longer-Range Proximity Detection
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Solution Overview
Problem
The limited size of the built-in single antenna electrode in electronic devices restricts the detection distance of SAR sensors, leading to inaccurate control of antenna radiation and potential adverse impacts on human health.
Innovation Solution
The electronic device incorporates a SAR sensor with two detection channels and two antenna electrodes, connected through an adjustment path that allows for adjusting the connection status between the antennas, thereby expanding the detection distance and improving radiation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single antenna electrode is used in the electronic device, then the device complexity is reduced, but the detection distance of the SAR sensor is limited and radiation control accuracy deteriorates
Solution Approach 1:
The patent divides the single antenna electrode into multiple antenna electrodes (first antenna electrode and second antenna electrode). Each electrode is connected to the SAR sensor through separate detection channels, enabling independent detection. This segmentation increases the total detection area and extends the detection distance while maintaining manageable device complexity through modular configuration.
Solution Approach 2:
The patent combines multiple antenna electrodes to form a unified detection system. The adjustment path enables dynamic connection between the first and second antenna electrodes, allowing them to work together as a combined structure. This merging increases the effective detection area and improves radiation control accuracy without significantly increasing overall device complexity.
2Length of stationary object
If the area of the antenna electrode is increased to extend detection distance, then the detection distance is improved, but the device size constraint is violated
Solution Approach 1:
The patent extends the detection area by utilizing multiple spatial dimensions within the device. Instead of increasing the area of a single electrode, the solution distributes multiple electrode elements across different locations and connects them through the adjustment path. This approach effectively increases the detection distance while maintaining compliance with device size constraints by using available spatial volume efficiently.
3Area of stationary object
If multiple antenna electrodes are added to expand detection area, then the detection distance is improved, but the device complexity increases
Solution Approach 1:
The SAR sensor is designed with multi-functionality to handle multiple antenna electrodes. The sensor can detect signals from individual electrodes or combined electrodes through the adjustment path, providing flexible detection modes. This universal design increases the detection area while minimizing the increase in device complexity by using the same sensor core for multiple detection functions.
Solution Approach 2:
The adjustment path introduces dynamic connectivity between antenna electrodes, allowing the system to adapt its configuration based on detection needs. The dynamic adjustment capability enables the system to optimize the detection area and connection status in real-time, improving detection performance without permanently increasing structural complexity.
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 configuration enables the electronic device to accurately detect user proximity over a longer distance, allowing for optimal adjustment of antenna radiation to minimize exposure to humans while maintaining antenna performance.
Implementation Method 1
The SAR sensor uses an area of a metal plate of an antenna electrode to detect the distance between the user and the electronic device. One detection channel is corresponding to one antenna electrode, and the antenna electrode serves as a plate of a capacitor.
Data Source
AI summary
This application discloses an electronic device. The electronic device includes: a SAR sensor, where the SAR sensor includes a first detection channel and a second detection channel; and a first antenna electrode and a second antenna electrode, where the first antenna electrode is connected to the SAR sensor through the first detection channel, the second antenna electrode is connected to the SAR sensor through the second detection channel, and the SAR sensor determines a distance between the electronic device and a human body by using a signal of the first antenna electrode and/or a signal of the second antenna electrode; where an adjustment path is disposed between the first antenna electrode and the second antenna electrode, and the adjustment path is configured to adjust a connection status between the first antenna electrode and the second antenna electrode.