Branched Multiconductor Transmission Line Noise Analysis
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Solution Overview
Problem
Existing methods are inadequate for analyzing noise characteristics in multiconductor transmission line systems with branches, making it difficult to design systems that effectively suppress noise.
Innovation Solution
An analysis method that models noise propagation in multiconductor transmission line systems by replacing branching lines with uniform lines and using a noise propagation model to analyze noise characteristics, followed by a design method that modifies components based on eigenvalue analysis to change characteristic impedance and peak frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing noise suppression techniques are applied to vehicle on-board wire harnesses with bundled wires, then noise manifestation is suppressed in bundled configurations, but the technique cannot be employed in multiconductor transmission line systems that include branched wiring
Solution Approach 1:
The patent transforms the physical layout parameters of branched wiring into an equivalent uniform transmission line model by changing the representation from spatial branching to sequential uniform sections with impedance transformations. This allows the noise suppression technique to be applied to branched configurations by mathematically equating the electrical characteristics rather than requiring physical bundling.
Solution Approach 2:
The patent creates an equivalent uniform transmission line model that copies the electrical behavior of the branched wiring structure. By establishing an equivalent model with uniform characteristic impedance that replicates the noise propagation characteristics of the original branched system, the technique enables noise analysis and suppression design for complex branched configurations using simplified uniform line theory.
2Measurement precision
If complex branched wiring structures are analyzed using traditional methods, then accurate noise characteristics can be obtained, but the analysis becomes computationally intensive and difficult to implement
Solution Approach 1:
The patent segments the complex branched wiring into multiple uniform transmission line sections separated by impedance transformation points. Each section is modeled as a uniform line with constant characteristic impedance, and the branching structures are represented as discrete impedance transformations at specific locations. This segmentation allows accurate noise analysis through sequential calculation while avoiding the computational complexity of analyzing the entire branched structure as a single complex system.
Data Source
AI summary
An analysis method and a design method for a multiconductor transmission line system are provided. One or more conductor lines include a branching section extending from a parallel section. One or more change positions for a characteristic impedance of the conductor lines include one or more branching sections. Each of the conductor lines is assumed to be routed back and forth between a first terminal circuit network and a second terminal circuit network using the one or more change positions for the characteristic impedance as one or more fold-back points. A design value of a specific component of components in the multiconductor transmission line system is modified such that the characteristic impedance of the specific component changes.