Transmission Line Shielding for Coupling Suppression
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Solution Overview
Problem
Existing transmission line designs that aim to suppress unnecessary coupling and reduce conductor loss complicate manufacturing by requiring complex adjustments such as hole formation and surface roughness adjustments, while also struggling to maintain stable characteristic impedance.
Innovation Solution
A transmission line configuration with first and second conductor patterns held between insulating layers and a third conductor pattern between them, where the distances between the patterns are optimized to suppress unnecessary coupling and maintain stable characteristic impedance, allowing for simpler manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If holes are formed between adjacent conductor patterns or conductor patterns are offset in the up/down direction to suppress unnecessary coupling, then coupling suppression is improved, but manufacturing complexity increases
Solution Approach 1:
A third non-signal conductor pattern is introduced as an intermediary element between the first and second signal conductor patterns. This intermediate conductor pattern acts as a shield that reduces electromagnetic coupling between the signal conductors without requiring holes or offsets, thereby suppressing unnecessary coupling while maintaining simple manufacturing processes
Solution Approach 2:
Instead of modifying the horizontal arrangement of conductor patterns (by creating holes or offsets), the solution introduces a vertical dimension by adding a third conductor pattern in between. This dimensional approach suppresses coupling through electromagnetic shielding while keeping the original conductor pattern positions intact, avoiding manufacturing complexity
2Loss of energy
If the front and back surfaces of conductor patterns and ground patterns are adjusted in surface roughness to reduce conductor loss, then conductor loss reduction is improved, but manufacturing complexity increases
Solution Approach 1:
The invention changes the geometric parameter (distance between conductors) rather than modifying surface properties. By optimizing the spacing between the first/second conductor patterns and the third non-signal conductor pattern, the solution reduces conductor loss through reduced current density and improved current distribution, avoiding complex surface roughness adjustments
3Object-affected harmful factors
If distance between conductor patterns is increased to suppress coupling, then coupling suppression is improved, but characteristic impedance stability deteriorates
Solution Approach 1:
The third non-signal conductor pattern serves as an intermediate shielding element that allows the first and second signal conductor patterns to maintain closer spacing for impedance stability while still achieving coupling suppression. The intermediate conductor creates multiple smaller gaps rather than one large gap, maintaining electromagnetic field control and characteristic impedance stability
Data Source
AI summary
A transmission line includes first and second conductor patterns that serve as signal transmission paths, first and second insulating layers that hold the first and second conductor patterns therebetween, and a third conductor pattern that is arranged between the first and second conductor patterns. No signal is transmitted through the third conductor pattern. A relation 0.5w≤S1≤1.5w and a relation 0.5w≤S2≤1.5w are satisfied in a range of a relation S≥2w, wherein S expresses a distance between the first conductor pattern and the second conductor pattern, w expresses a width of each of the first conductor pattern and the second conductor pattern, S1 expresses a distance between the first conductor pattern and the third conductor pattern, and S2 expresses a distance between the second conductor pattern and the third conductor pattern.