Antenna Power Control via Reflected Power Feedback
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Solution Overview
Problem
Existing antenna power control systems in wireless devices are inaccurate due to variations in antenna impedance caused by objects in the vicinity, leading to impedance mismatches and inefficient power radiation.
Innovation Solution
The system measures both forward and reflected power to dynamically adjust the power sent to the antenna, using a directional coupler and internal detectors to compensate for changing impedance, enabling continuous power control with minimal additional cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If forward power measurement is used for power control, then power monitoring is simple, but measurement accuracy deteriorates due to antenna impedance variations
Solution Approach 1:
The system measures reflected power from the antenna and uses this feedback to detect impedance changes. By monitoring the reflected power level and comparing it against expected values, the system can identify when impedance mismatch occurs and adjust the forward power accordingly to maintain accurate power control despite antenna impedance variations.
Solution Approach 2:
The system introduces reflected power measurement as an intermediary indicator to detect antenna impedance changes. Instead of directly measuring antenna impedance or correcting forward power measurements, the system uses reflected power as a mediator to infer impedance conditions and adjust power control decisions based on this indirect measurement.
2Adaptability or versatility
If antenna impedance varies due to nearby objects, then adaptability to environment improves, but power radiation efficiency deteriorates due to impedance mismatch
Solution Approach 1:
The system continuously monitors reflected power to detect changes in antenna impedance caused by environmental factors. When impedance mismatch is detected through reflected power measurements, the system provides feedback to adjust the forward power level, compensating for the energy loss and maintaining efficient power radiation despite varying antenna conditions.
3Measurement precision
If reflected power measurement is added to the system, then power measurement accuracy improves, but device complexity increases
Solution Approach 1:
The system combines forward power measurement and reflected power measurement into a unified power control mechanism. By integrating both measurements and using them together to detect impedance changes and adjust power levels, the system achieves accurate power control without requiring separate independent control loops, thereby limiting the increase in overall system 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 approach ensures accurate power adjustment to maintain optimal performance by accounting for impedance changes, preventing power amplifier overload and improving signal transmission quality.
Implementation Method 1
a directional coupler and internal detectors to compensate for changing impedance
Implementation Method 2
The amount of reflected power can be used to detect changes in antenna impedance
Data Source
AI summary
Systems and methods are provided for detecting forward power sent to an antenna and reflected power reflected back from the antenna. Embodiments of the present invention provide systems and methods for measuring forward and reflected power and controlling the amount of power supplied to the antenna responsive to these measurements. Embodiments of the present invention enable the power sent to the antenna to be dynamically altered when antenna impendence changes (e.g., when the antenna gets too close to another object).