Impedance Matching Line Transformer with Ferrite Damping
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Solution Overview
Problem
Existing impedance transformers are not suitable for high-frequency applications beyond the shortwave range due to dimensional limitations, and they generate excessive heat that can lead to component destruction, especially in power amplifiers.
Innovation Solution
A line transformer design featuring identical high-frequency line sections made as printed lines, routed through a ferrite body for damping standing waves, with a heat sink for efficient heat dissipation and a common ferrite body surrounding multiple line sections to prevent unwanted coupling, allowing for adjustable transformation ratios and impedance matching across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conductor tracks are looped through a ferrite core multiple times to achieve impedance transformation, then the transformation ratio is achieved, but the transformer dimensions become too large for microwave frequency applications
Solution Approach 1:
The transformer is divided into multiple identical high-frequency line sections (first line section, second line section, etc.) that can be independently designed and manufactured. Each section has the same physical dimensions but contributes differently to the overall transformation ratio through their connection configuration (series/parallel arrangements), eliminating the need for multiple loops through a ferrite core.
Solution Approach 2:
Instead of achieving transformation through repeated loops in one dimension (length), the patent uses the dimension of connection topology (series/parallel configurations of identical sections) to achieve the same transformation effect with much shorter physical length.
2Reliability
If ferrite body is used to damp standing waves in high-frequency line sections, then signal quality is improved, but excessive heat is generated that can destroy the transformer
Solution Approach 1:
The harmful heat generated in the ferrite body is extracted and removed from the system by providing a dedicated heat sink that is thermally coupled to the ferrite body, separating the heat dissipation function from the signal processing function.
Solution Approach 2:
A heat sink is introduced as an intermediary component between the ferrite body and the environment, facilitating efficient heat transfer from the ferrite body to the surrounding air or cooling medium.
3Adaptability or versatility
If multiple high-frequency line sections are used for impedance matching, then broadband capability is achieved, but manufacturing complexity increases
Solution Approach 1:
All high-frequency line sections are designed to be identical in terms of physical dimensions, impedance characteristics, and construction. This homogeneity simplifies manufacturing as all sections can be produced using the same process and then connected in different configurations to achieve various transformation ratios and broadband performance.
4Adaptability or versatility
If high-frequency line sections are arranged in parallel over minimum length, then broadband capability is enhanced, but heat dissipation becomes more difficult
Solution Approach 1:
The ferrite body serves multiple functions simultaneously: it dampens standing waves in all parallel line sections, providing signal quality improvement, while also serving as a heat generation source that is thermally coupled to the heat sink for efficient heat dissipation from all sections.
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 design enhances manufacturing reliability and reduces production costs by enabling impedance matching in high-frequency applications, including the microwave range, while effectively managing heat generation and preventing component damage.
Implementation Method 1
At least one of the strip lines is routed through a ferrite body for damping standing waves
Implementation Method 2
The dissipation of the resulting heat to the environment can be improved by providing a heat sink connected to the ferrite body
Implementation Method 3
A standard heat sink can be attached to this flat contact surface
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a line transformer for impedance matching in high-frequency applications. The line transformer (1') comprises at least one first high-frequency line section (2) and a second high-frequency line section (3). At least one of the high-frequency line sections (2, 3) is surrounded by a ferrite body (12), the high-frequency line sections (2, 3) being provided in the form of microstrip lines between a first connection (10) and a second connection (11). The high-frequency line sections (2, 3, 29) have an essentially identical impedance.