Mobile Antenna Impedance Matching Using Power Control Feedback
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Solution Overview
Problem
Existing antenna impedance matching methods in wireless communication systems require additional components, increasing manufacturing costs and complicating the process, while also reducing transmit power due to variations in antenna input impedance caused by user interaction with mobile stations.
Innovation Solution
An apparatus and method for antenna impedance matching in wireless communication systems that uses power control information to adjust a variable capacitance, optimizing impedance matching and maximizing transmit power efficiency by controlling the antenna's impedance to match the surrounding environment's changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antenna impedance matching methods are used, then impedance matching is achieved, but additional components are required which increase manufacturing cost and device complexity
Solution Approach 1:
The patent combines the impedance matching function with existing power control components in the mobile station. The power control unit that already exists for controlling transmit power is repurposed to also control the variable capacitor for impedance matching, eliminating the need for separate impedance matching control hardware and reducing overall device complexity.
Solution Approach 2:
The power control unit is given a dual function: it continues to control transmit power while also controlling the variable capacitor to adjust antenna impedance. This multi-functionality approach allows the same component to handle both power control and impedance matching tasks, reducing the number of additional components needed.
2Reliability
If traditional antenna impedance matching methods are used, then impedance matching is achieved, but the process becomes complicated
Solution Approach 1:
The patent merges the impedance matching control process with the existing power control process. The base station sends power control commands that the mobile station's power control unit processes, and the same unit simultaneously adjusts the variable capacitor for impedance matching. This integration simplifies the overall control process by using a single unified control mechanism rather than separate independent systems.
3Adaptability or versatility
If antenna impedance varies due to user interaction, then adaptability to user handling is achieved, but transmit power efficiency decreases
Solution Approach 1:
The patent employs a variable capacitor that can dynamically adjust its capacitance value in real-time based on changing antenna impedance conditions caused by user interaction. The power control unit continuously monitors impedance variations and adjusts the variable capacitor accordingly, allowing the system to adapt to different user handling scenarios while maintaining optimal power transfer efficiency.
Solution Approach 2:
The system uses feedback from the base station's power control commands to detect impedance changes in the antenna. When the base station adjusts power control levels in response to impedance mismatches, the mobile station's power control unit interprets these changes and adjusts the variable capacitor to compensate, creating a closed-loop feedback system that maintains transmit power efficiency despite user interaction variations.
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 simplifies and enhances antenna impedance matching, increasing transmit power efficiency and maintaining communication performance by adjusting the antenna's impedance in real-time based on power control information, thereby reducing manufacturing costs and improving system performance.
Implementation Method 1
determines a variable capacitance value for changing frequency characteristics of an antenna based on received power control information
Data Source
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AI summary
An apparatus and method for matching antenna impedance in a mobile station are provided. In implementation, a mobile station receives power control information including information for controlling transmit power of the mobile station, generates matching control information for antenna impedance matching based on the received power control information, and performs antenna impedance matching depending on the generated matching control information.