Mobile Antenna Power Control via Impedance-Based Environment Detection
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Solution Overview
Problem
Mobile computing devices experience increased power consumption and dropped calls due to antenna impedance mismatch, especially when in talk position, as the user's head absorbs radiating energy, leading to reduced battery life and poor communication quality.
Innovation Solution
The device determines the user environment based on detected antenna impedance or current, confirms that the total radiation power exceeds the minimum threshold, and adjusts the conducted power level to the antenna system, further improving impedance matching to reduce power consumption while maintaining acceptable quality of service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile computing device operates at high conducted power level to maintain communication quality, then the communication reliability is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by continuously monitoring antenna impedance and dynamically adjusting the conducted power level based on real-time impedance conditions. The system transitions from static power operation to dynamic power adjustment, where the power amplifier's output power is modulated according to detected impedance changes, thereby optimizing the balance between communication reliability and power consumption.
Solution Approach 2:
The patent implements feedback by creating a closed-loop control system that monitors antenna impedance and uses this information to adjust the conducted power level. The impedance detection circuit continuously measures antenna impedance, feeds this information back to the power control logic, which then adjusts the power amplifier's output accordingly, maintaining optimal communication performance while minimizing power consumption.
2Reliability
If the mobile computing device increases conducted power to compensate for energy absorption by the user's head in talk position, then the signal quality is improved, but the battery life is reduced
Solution Approach 1:
The patent applies parameter changes by detecting shifts in antenna impedance caused by the user's head proximity and adjusting the conducted power level parameter accordingly. When the impedance indicates talk position (head near antenna), the system modifies the power parameter to compensate for energy absorption, and when impedance indicates hands-free position, it reduces power, thereby extending battery life while maintaining signal quality.
Solution Approach 2:
The system dynamically adapts the conducted power level based on real-time impedance measurements that reflect the user's holding position. This dynamic adjustment allows the device to operate at high power only when necessary (talk position with head absorption) and at lower power when not necessary (hands-free position), optimizing the duration of battery action.
3Device complexity
If the mobile computing device uses fixed conducted power level, then the device complexity is reduced, but the adaptability to different user environments deteriorates
Solution Approach 1:
The patent applies self-service by enabling the antenna system to automatically detect its own impedance conditions and self-adjust the conducted power level without requiring complex external control mechanisms. The impedance detection circuit and power control logic work together to create a self-regulating system that adapts to different user environments (talk position, hands-free position) while adding minimal complexity to the overall device architecture.
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 approach achieves significant power savings, extending battery life and maintaining communication quality by dynamically adjusting power levels and impedance matching based on the user environment, reducing power consumption by up to 34% in hands-free environments and 21% in talk position.
Implementation Method 1
the head of a user is a lossy dielectric material and typically absorbs 1-6 dB energy radiating from the mobile computing device
Data Source
AI summary
Various embodiments are directed to systems and techniques for reducing power consumption in a mobile computing device. In one or more embodiments, a mobile computing device may be arranged to determine a user environment based on detected antenna impedance or detected current. After the user environment is determined, the mobile computing device may confirm that total radiation power (TRP) for the mobile computing device at an initial conducted power level exceeds the minimum TRP threshold required by the network carrier to receive acceptable quality of service (QoS). Based on the excess TRP for the particular user environment, the mobile computing device may determine a reduced conducted power level to be input to an antenna system. Accordingly, significant power savings may be achieved. To save additional power, the mobile computing device may automatically adjust and/or improve antenna impedance matching based on user environment allowing a further reduction in conducted power. Other embodiments are described and claimed.