Multilayer Substrate Layout to Reduce Conductor Layer Coupling
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Solution Overview
Problem
Existing multilayer substrates face challenges in reducing coupling between branched conductor layers and radiation conductor layers, which affects signal transmission and reception efficiency.
Innovation Solution
A multilayer substrate design featuring a radiation conductor layer, first and second ground conductor layers, an electric current path, and a branched conductor layer, where the second ground conductor layers are positioned to overlap the branched conductor layer but not the radiation conductor layer, reducing coupling and improving signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the branched conductor layer is positioned close to the radiation conductor layer for compact design, then the device size is reduced, but coupling between the conductor layers increases causing signal interference
Solution Approach 1:
A ground conductor layer is introduced as an intermediary between the radiation conductor layer and the branched conductor layer. This ground layer acts as a shield that reduces electromagnetic coupling between the two conductor layers while allowing them to be positioned in close proximity for compact device design.
Solution Approach 2:
The solution moves from planar separation to three-dimensional layering by utilizing the Z-axis dimension. Multiple conductor layers are stacked at different heights with the ground layer positioned between the radiation and branched conductor layers, reducing coupling while maintaining compact footprint.
2Reliability
If ground conductor layers are added to reduce coupling, then signal integrity is improved, but device complexity increases
Solution Approach 1:
The ground conductor layer serves multiple functions simultaneously: it acts as an electromagnetic shield to reduce coupling between conductor layers, provides a reference potential plane for signal transmission, and serves as part of the overall ground structure. This multi-functionality reduces the need for additional separate components.
3Object-generated harmful factors
If the second ground conductor layer overlaps the branched conductor layer, then coupling between branched and radiation conductor layers is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The ground conductor structure is segmented into multiple separate ground layers positioned at different heights and locations. The first ground layer is positioned near the radiation conductor layer while the second ground layer is positioned near the branched conductor layer, allowing each segment to address specific coupling issues independently.
Data Source
AI summary
A multilayer substrate includes a first ground conductor layer overlapping a radiation conductor layer when viewed in a negative direction of the Z-axis and extending in the negative direction of the Z-axis from the radiation conductor layer, and second ground conductor layers not overlapping the radiation conductor layer and extending in a positive direction of the Z-axis from the first ground conductor layer. No ground conductor layer other than the first ground conductor layer is located between the radiation conductor layer and the second ground conductor layers. An electric current path is connected to the radiation conductor layer. A branched conductor layer extends in the negative direction of the Z-axis from the second ground conductor layers, and extends away from the electric current path. At least a portion of the branched conductor layer overlaps the second ground conductor layers.