Antenna Impedance Matching with Single-Variable Reflection Sensing
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Solution Overview
Problem
Existing impedance matching devices for radiofrequency signals are inefficient due to long impedance matching phases and high power consumption, particularly when used in environments with conductive elements that cause impedance mismatches, requiring complex and costly detectors to measure reflected power.
Innovation Solution
A device with a single variable inductive or capacitive component in its impedance matching network, utilizing a directional coupler and a diode to measure reflected power with a less sensitive detector, allowing for quicker impedance matching by varying the component value to minimize reflected power, thus reducing the duration and power consumption of the matching phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known impedance matching devices are used to match antenna impedance with radiofrequency source impedance in environments with conductive elements, then impedance matching is achieved, but the impedance matching phase becomes long and power consumption increases
Solution Approach 1:
The patent changes the parameter of having multiple variable components to having a single variable component in the impedance matching network. This reduction in the number of variable parameters allows for faster impedance matching by varying only one component value to minimize reflected power, thus shortening the matching phase duration while maintaining matching reliability
Solution Approach 2:
The patent introduces a directional coupler as an intermediary device to measure reflected power. This coupler enables the use of a less sensitive detector by providing a scaled-down version of the reflected signal, allowing for accurate measurement without requiring a highly sensitive detector, thereby reducing power consumption during the measurement and matching process
2Reliability
If known impedance matching devices are used to match antenna impedance with radiofrequency source impedance in environments with conductive elements, then impedance matching is achieved, but power consumption increases
Solution Approach 1:
The directional coupler acts as an intermediary that reduces the power level of the reflected signal before it reaches the detector. By coupling only a portion of the reflected power to the detector, the system can use a less sensitive detector that consumes less power, while still achieving accurate reflected power measurement for impedance matching
Solution Approach 2:
The patent employs a simpler detector with lower sensitivity requirements, which can be implemented using less expensive and lower power consumption components. The directional coupler enables this simplification by pre-processing the reflected signal to reduce the detection burden
3Measurement precision
If complex detectors are used to measure reflected power in known impedance matching devices, then measurement accuracy is maintained, but device complexity and cost increase
Solution Approach 1:
The directional coupler serves as an intermediary signal processing element that simplifies the measurement task. It provides a scaled version of the reflected power signal that can be accurately measured by a less sensitive, simpler detector, thereby maintaining measurement precision while reducing detector complexity and overall device 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
The solution significantly shortens the impedance matching phase and reduces power consumption by using a simpler detection system, allowing the device to efficiently match impedance with the radiofrequency source even in the presence of conductive elements, while maintaining effective power transmission.
Implementation Method 1
a diode coupling 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 inductive and/or capacitive components of fixed value and a single inductive or capacitive value of settable value
Implementation Method 3
an impedance matching network comprising inductive and/or capacitive components of fixed value and a single inductive or capacitive value of settable value
Data Source
AI summary
A circuit device includes a directional coupler with a first port receiving a radiofrequency signal, a second port outputting a signal in response to signal received by the first port, and a third port outputting a signal in response to a reflection of the signal at the second port. An impedance matching network is connected between the second port and an antenna. The impedance matching network includes fixed inductive and capacitive components and a single variable inductive or capacitive component. A diode coupled to the third port of the coupler generates a voltage at a measurement terminal which is processed in order to select and set the inductance or capacitance value of the variable inductive or capacitive component.