Antenna Impedance Matching Network With Single-Point Tuning
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Solution Overview
Problem
Existing impedance matching devices for radio frequency antennas suffer from long impedance matching phases, which consume significant energy and are inefficient due to the need for multiple combinations of adjustable components to find minimum reflected power, especially when used in battery-powered systems.
Innovation Solution
A device with a simplified impedance matching network comprising fixed-value and single adjustable-value inductive or capacitive components, using a directional coupler and a diode with an analog-to-digital converter to measure reflected power, allowing for quicker adaptation by varying the adjustable component until a single minimum voltage is reached, reducing the scanning range and duration of the matching phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple adjustable components are used in the impedance matching network, then the impedance matching can handle a wider range of impedance variations, but the matching phase becomes longer and consumes more energy
Solution Approach 1:
The impedance matching network is segmented into fixed-value components and a single adjustable-value component. The fixed components handle the majority of impedance matching requirements, while the single adjustable component fine-tunes the matching, thereby reducing the complexity of the scanning process and shortening the matching phase duration.
Solution Approach 2:
The system dynamically adjusts the single adjustable-value component based on real-time impedance conditions. By making the component value variable rather than fixed, the system can adapt to impedance changes without requiring multiple adjustable components, thus maintaining versatility while reducing matching time.
2Adaptability or versatility
If multiple adjustable components are used in the impedance matching network, then the impedance matching can handle a wider range of impedance variations, but the energy consumption increases
Solution Approach 1:
The impedance matching network is segmented into fixed-value components and a single adjustable-value component. The fixed components handle the majority of impedance matching requirements, while the single adjustable component fine-tunes the matching, thereby reducing the complexity of the scanning process and shortening the matching phase duration.
Solution Approach 2:
The system discards the need for multiple adjustable components and recovers energy by using only a single adjustable component. This reduction in component count directly reduces the energy required for scanning and adjustment, making the system more energy-efficient while maintaining adequate impedance matching capability.
3Loss of time
If a single adjustable component is used in the impedance matching network, then the matching phase is shorter and energy consumption is reduced, but the detector sensitivity requirements increase
Solution Approach 1:
The system uses a feedback mechanism where the detector monitors the reflected power and provides information to adjust the single adjustable-value component. This feedback loop enables the system to achieve accurate impedance matching with a single component by continuously optimizing based on real-time measurements, thereby reducing matching time without sacrificing precision.
Solution Approach 2:
The fixed-value components are pre-configured to provide initial impedance matching, performing preliminary action before the single adjustable component fine-tunes the matching. This preliminary setup reduces the adjustment range required and minimizes the time and sensitivity needed for the final optimization step.
4Use of energy by moving object
If a single adjustable component is used in the impedance matching network, then the matching phase is shorter and energy consumption is reduced, but the device complexity increases
Solution Approach 1:
The impedance matching network is segmented into fixed-value components and a single adjustable-value component. The fixed components handle the majority of impedance matching requirements, while the single adjustable component fine-tunes the matching, thereby reducing the complexity of the scanning process and shortening the matching phase duration.
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 shortens the impedance matching phase, reduces energy consumption, and allows for impedance matching with a less sensitive detector, as it identifies a single minimum reflected power point, facilitating faster adaptation to the source impedance.
Implementation Method 1
a diode connecting the third port of the coupler to a measurement terminal of the device configured to be connected to an analog-to-digital converter
Implementation Method 2
an impedance matching network comprising fixed-value inductive and/or capacitive components and a single adjustable-value inductive or capacitive component
Implementation Method 3
a directional coupler comprising a first port configured to be connected to a source of a radio frequency signal, a second port to which a signal received by the first port is transmitted and a third port to which a signal received by the second port is transmitted
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
This description relates to a device comprising: an antenna (2); a directional coupler (4) comprising a first port (401) receiving a radio frequency signal, a second port (402) to which a signal received by the first port (401) is transmitted and a third port (403) to which a signal received by the second port (402) is transmitted; an impedance matching network (3') connected between the second port (402) and the antenna (2) and comprising inductive and/or capacitive components (C1', L1, C2', L2, C3) of which a single inductive or capacitive component (C3) has an adjustable value; and a diode (6) connecting the third port (403) of the coupler (4) to a measurement terminal (104) of the device (1') configured to be connected to an analog-to-digital converter.