Antenna Grip Sensor Switching for Accurate SAR Control
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Solution Overview
Problem
Electronic devices face challenges in determining whether a user is gripping the device, which affects the determination of electromagnetic wave absorption rates, potentially leading to non-compliance with specific absorption rate standards.
Innovation Solution
An electronic device comprising an antenna circuit with an antenna, a first capacitor, a switch, a sensor, and at least one processor. The processor controls the switch to connect the first capacitor and the sensor at booting, determines the initial sensor value to assess grip, and connects the antenna circuit and sensor based on this value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is connected to the antenna circuit during booting, then the device can detect grip status, but the initial sensor value may be inaccurate due to electromagnetic wave interference
Solution Approach 1:
The patent applies preliminary action by connecting the sensor to a capacitor instead of the antenna circuit during the booting phase. This preliminary configuration allows the sensor to initialize and determine its initial value in an environment free from electromagnetic wave interference. The switch then transitions the sensor to connect with the antenna circuit only after the initial value is established, preventing interference from affecting measurement accuracy.
2Device complexity
If the sensor is connected to the antenna circuit immediately, then the device structure is simpler, but the specific absorption rate determination becomes inaccurate
Solution Approach 1:
The patent applies segmentation by dividing the sensor connection process into two distinct phases: initialization phase (connecting sensor to capacitor during booting) and operational phase (connecting sensor to antenna circuit). This segmentation separates the functions of initial value determination and actual grip detection, ensuring that each phase occurs under appropriate conditions without compromising overall system simplicity.
3Productivity
If electromagnetic wave transmission strength is increased to improve communication, then communication performance improves, but specific absorption rate standards may be violated
Solution Approach 1:
The patent applies feedback by using the sensor to continuously monitor grip status and providing this information back to the processor. The processor then adjusts the electromagnetic wave transmission strength based on the detected grip status, ensuring communication performance is optimized while maintaining compliance with specific absorption rate standards. This closed-loop control allows dynamic adjustment of transmission parameters.
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 the electronic device to accurately determine if a user is gripping the device, allowing for adjustments to electromagnetic wave transmission strength to ensure compliance with specific absorption rate standards.
Implementation Method 1
determine an initial value of the sensor for determining whether a user grips at least a portion of the electronic device
Data Source
AI summary
According to an embodiment, an electronic device may comprise an antenna circuit including an antenna, a first capacitor, a switch, a sensor, and at least one processor. The at least one processor may be configured to control the switch to connect the first capacitor and the sensor, based on start of booting of the electronic device, determine an initial value of the sensor for determining whether a user grips at least a portion of the electronic device, based on the connection of the first capacitor and the sensor, and control the switch to connect the antenna circuit and the sensor, based on the determination of the initial value of the sensor. Other various embodiments are possible as well.