Adjustable Impedance Adapter with Movable Slider
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Solution Overview
Problem
Conventional impedance matching devices are unsuitable for lower frequency ranges due to their large dimensions, making them inappropriate for compact device applications below one gigahertz.
Innovation Solution
An adjustable impedance matcher with simultaneously variable inductance and capacitance, achieved through a coaxial line section with a movable conductive slider, allowing for compact design and impedance adjustment in the 100 to 900 MHz frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional impedance matching devices are used, then impedance matching can be achieved, but the device dimensions become too large for frequencies below one gigahertz
Solution Approach 1:
The patent employs a movable conductive element (slider or piston) that can be positioned at different locations along the coaxial line section. This dynamic positioning allows continuous adjustment of both inductance and capacitance values, enabling the device to achieve impedance matching across a wide frequency range including frequencies below one gigahertz, while maintaining a compact form factor.
Solution Approach 2:
The invention changes the electrical parameters (inductance and capacitance) by physically moving the conductive element to different positions within the coaxial line. This allows the same physical structure to provide different electrical characteristics, enabling the device to function effectively at lower frequencies without requiring proportionally larger dimensions.
2Device complexity
If a single movable part is used in the impedance adapter, then the structure remains simple, but the impedance matching range is limited to 25-100 ohms
Solution Approach 1:
The patent creates different electrical conditions at different locations within the coaxial line by positioning the movable conductive element at various points. The element interacts differently with the electromagnetic field depending on its position, allowing a single component to provide a wide range of impedance values (from a few ohms to several hundred ohms) without increasing structural 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
Enables efficient impedance matching in lower frequency ranges, facilitating the development of compact devices with improved power transfer efficiency between transmitters and receivers.
Implementation Method 1
A first distance between the slider and the second end makes it possible to vary the inductance of the impedance adapter
Implementation Method 2
A third distance along a direction transverse to the coaxial direction between the outer walls of the conductive slider and the inner walls of the shielding is variable and makes it possible to vary a capacitance of the impedance adapter
Data Source
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AI summary
The invention proposes an adjustable impedance adapter connected at a first end to a transmitter and at a second end to a receiver. The adapter comprises a section of coaxial line extending in a coaxial direction, the section of coaxial line comprising a conductive central core extending in the coaxial direction, an electrically insulating medium surrounding the central core and a conductive shield surrounding the electrically insulating medium, and a conductive slider movable in translation inside the section of coaxial line. A first distance between the slider and the second end makes it possible to vary the inductance of the impedance adapter, and a third distance in a direction transverse to the coaxial direction between outer walls of the slider and inner walls of the shield being variable between the two ends of the section of coaxial line can be used to vary the capacitance of the impedance adapter. Therefore, the inductance and the capacitance of the impedance adapter depend on the position of the slider on the section of coaxial line.