Segmented Ground Conductor for Transmission Line Isolation
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Solution Overview
Problem
As electronic devices shrink, the demand for smaller transmission lines increases, but existing configurations lead to reduced isolation between adjacent signal conductors due to closer spacing, causing coupling and interference issues.
Innovation Solution
A transmission line design featuring a plate-shaped dielectric body with stacked dielectric layers, signal conductors, and a common ground conductor with intermediate portions that reduce coupling between signal conductors, including additional ground conductors to prevent radiation and external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the width of the transmission line is narrowed to reduce device size, then the size of the transmission line is reduced, but the distance between adjacent signal conductors decreases causing increased coupling and reduced isolation
Solution Approach 1:
The ground conductor is segmented into multiple portions (first ground conductor portion, second ground conductor portion, third ground conductor portion) positioned at different locations. This segmentation allows each ground portion to independently shield adjacent signal conductors, providing effective isolation even when signal conductors are closely spaced in a narrow transmission line configuration.
Solution Approach 2:
Ground conductors serve as intermediary elements positioned between adjacent signal conductors. These intermediate ground portions act as shielding barriers that prevent direct electromagnetic coupling between signal conductors, enabling maintained isolation performance despite reduced spacing caused by compact transmission line design.
2Area of stationary object
If multiple signal conductors are arranged close to each other in a single dielectric body, then the transmission line can be made more compact, but coupling between signal conductors increases reducing signal integrity
Solution Approach 1:
The ground conductor system is divided into multiple segmented portions (first, second, third ground conductor portions) that are strategically positioned to create electromagnetic shielding zones between adjacent signal conductors. This segmentation enables effective coupling prevention while maintaining a compact overall transmission line structure that occupies minimal area.
Solution Approach 2:
Intermediate ground conductor portions are positioned between adjacent signal conductors to act as shielding intermediaries. These intermediate ground portions block electromagnetic field coupling between signal conductors, eliminating the harmful coupling effect while allowing the transmission line to maintain a compact footprint.
3Device complexity
If a common ground conductor is shared by multiple signal conductors, then the structure is simplified, but coupling between signal conductors increases due to reduced spacing
Solution Approach 1:
The common ground conductor is segmented into multiple distinct portions (first, second, third ground conductor portions) positioned at different locations. This segmentation maintains structural simplicity while creating effective electromagnetic shielding zones between signal conductors, preserving isolation performance without increasing overall structural complexity.
Solution Approach 2:
Different portions of the ground conductor are positioned with specific local qualities - the first ground conductor portion shields the first signal conductor, the second ground conductor portion is positioned between signal conductors for coupling prevention, and the third ground conductor portion shields the second signal conductor. This local quality differentiation enables effective isolation while maintaining a simple common ground structure.
Data Source
AI summary
A transmission line includes, in a dielectric body, a first ground conductor, and first and second signal conductors arranged in a width direction of the dielectric body. The first ground conductor includes a first signal conductor ground portion disposed closer to a first side of the dielectric body in a thickness direction than the first signal conductor, a second signal conductor ground portion disposed closer to a second side of the dielectric body in the thickness direction than the second signal conductor, and an intermediate portion that connects the first signal conductor ground portion to the second signal conductor ground portion. The intermediate portion is disposed between a first transmission line including the first signal conductor and the first signal conductor ground portion and a second transmission line including the second signal conductor and the second signal conductor ground portion.