Multi-Section Directional Coupler Layout for Lower Parasitic Coupling
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Solution Overview
Problem
Conventional multi-section directional couplers suffer from unwanted parasitic coupling between coupled lines, leading to reduced directivity and performance, particularly in reflection coefficient measurements.
Innovation Solution
Incorporating grounded conductive coupling reduction structures adjacent to selected coupled line sections with different coupling strengths to reduce parasitic coupling, maintaining a constant coupling factor and improving directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-section directional couplers are used, then the basic coupling function is provided, but unwanted parasitic coupling between coupled lines occurs leading to reduced directivity
Solution Approach 1:
The patent introduces grounded conductive coupling reduction structures as intermediary elements between the coupled lines. These structures act as mediators that intercept and redirect parasitic coupling fields to ground, preventing the harmful coupling from affecting the signal transmission between the main coupled lines, thereby improving directivity
Solution Approach 2:
The patent extracts and removes the parasitic coupling effect from the system by providing alternative coupling paths through the grounded structures. The harmful parasitic coupling is separated from the main signal path and directed to ground, effectively taking out the unwanted coupling from the functional signal transmission path
2Measurement precision
If coupling strength is increased in selected sections, then coupling factor is maintained, but parasitic coupling increases reducing measurement accuracy
Solution Approach 1:
The patent applies local quality by making different sections of the coupled lines have different coupling strengths optimized for their specific functions. Selected sections have higher coupling for signal transmission while being equipped with grounded coupling reduction structures to suppress parasitic coupling, allowing each section to have tailored properties for its specific role in improving measurement accuracy
3Reliability
If grounded conductive coupling reduction structures are added, then parasitic coupling is reduced and directivity is improved, but device complexity increases
Solution Approach 1:
The patent employs parameter changes by modifying the electrical characteristics of the coupler through the grounded conductive structures. These structures change the coupling parameters (coupling coefficient, phase relationship) between the lines, allowing optimization of directivity and performance by adjusting electrical parameters rather than fundamentally redesigning the entire coupler structure
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
Enhances directivity and measurement accuracy by mitigating parasitic coupling, achieving improved performance in various applications including reflection coefficient measurements.
Implementation Method 1
unwanted parasitic coupling between coupled lines of coupled line sections
Data Source
AI summary
The disclosure describes a multi-section directional coupler comprising: a plurality of conductive lines, each conductive line comprises a plurality of line sections; a plurality of coupled line sections, each coupled line section comprises a first line section of a first conductive line and a second line section of a second conductive line, the coupled line sections comprise different coupling strength values, the coupled line sections facilitate signal coupling; and at least one grounded conductive coupling reduction structure arranged adjacent to a selected coupled line section and operable to reduce a coupling value between a respective line section of the first conductive line and a respective line section of the second conductive line of the selected coupled line section. The selected coupled line section comprises a smaller coupling strength value than another one of the coupled line sections. Methods of manufacturing and operating the multi-section directional coupler are also provided.