Multi-band Antenna Impedance Tuning via Dynamic Capacitance Adjustment
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Solution Overview
Problem
Multi-band terminal devices face impedance mismatching issues due to limited space, leading to excessive power consumption and reduced antenna sensitivity, especially when operating in varying environments.
Innovation Solution
A method and terminal device that automatically tune impedance matching by obtaining operation current and output power values to adjust antenna tuner parameters, optimizing capacitance in series-parallel configurations for improved performance and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single antenna is used to cover multiple bands, then the device space is saved, but the antenna performance is degraded due to impedance mismatching
Solution Approach 1:
The patent implements a tuner mechanism that dynamically adjusts impedance matching parameters based on the operating band and environmental conditions. The system switches between different capacitance values (e.g., 5pF, 10pF, 15pF, 20pF) to optimize antenna performance across multiple bands, transforming the static antenna system into a dynamic one that adapts to different operating conditions.
Solution Approach 2:
The patent changes physical parameters of the antenna system by introducing variable capacitance elements that can be adjusted to different values. By modifying the capacitance parameter in the impedance matching network, the system optimizes performance for different frequency bands while using the same antenna structure.
2Device complexity
If fixed impedance matching is used for multi-band antenna, then device complexity is reduced, but power consumption increases due to mismatching
Solution Approach 1:
The system transitions from fixed to dynamic impedance matching by implementing a tuner mechanism that automatically adjusts capacitance values based on operating conditions. This dynamic adjustment optimizes power efficiency across different bands without requiring complex manual intervention, achieving a balance between automation and power consumption.
Solution Approach 2:
The patent implements a feedback mechanism that monitors operating conditions (such as operating band and environmental changes) and automatically adjusts the impedance matching parameters accordingly. This closed-loop control system optimizes power consumption by maintaining proper impedance matching without requiring excessive power for continuous adjustment.
3Device complexity
If same matching devices are used for all bands, then device complexity is minimized, but antenna sensitivity is reduced due to mismatching
Solution Approach 1:
The patent implements a dynamic tuner mechanism that adjusts capacitance values based on the operating band and environmental conditions. The system switches between different capacitance configurations (series-parallel arrangements of 5pF, 10pF, 15pF, 20pF capacitors) to optimize antenna sensitivity for each band, transforming the static matching network into an adaptive one.
Solution Approach 2:
The system changes the electrical parameters of the matching network by adjusting capacitance values. By modifying the capacitance parameter in response to different operating bands and environmental conditions, the system maintains optimal antenna sensitivity without requiring completely different matching devices for each band.
Data Source
AI summary
This invention provides a method and a terminal device for a multi-band antenna automatically tuning impedance matching, and belongs to the technical field of communication. The method includes: obtaining an operation current value and an output power value of a power amplifier upon transmitting a signal; obtaining a logical control parameter for controlling an antenna tuner based on the operation current value and the output power value, and adjusting the impedance matching of the antenna by using the logical control parameter. The efficiency for impedance matching of the antenna upon operating in the multi-bands may be improved, and the power saving can be better implemented under the condition of assuring the performance of the antenna.