High-Frequency Circuit Shield Via Layout for Crosstalk Suppression
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Solution Overview
Problem
Existing high frequency circuits face challenges in suppressing crosstalk due to electromagnetic wave leakage between adjacent signal supply paths, particularly when line intervals are narrow and manufacturing accuracy is a concern.
Innovation Solution
A high frequency circuit design featuring shield vias with a cross-sectional shape inscribed in a virtual rectangle, connected to multiple grounds, and arranged to suppress electromagnetic wave leakage between signal lines, with specific geometric configurations to enhance crosstalk suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional circular shield vias are used, then the structure is simple to manufacture, but crosstalk suppression effectiveness is insufficient
Solution Approach 1:
The patent applies asymmetry by changing the via cross-sectional shape from a conventional circular symmetric shape to an inscribed rectangle shape. This asymmetric rectangular shape provides better crosstalk suppression performance while maintaining manufacturability through standard PCB drilling and plating processes.
Solution Approach 2:
The patent changes the geometric parameters of the shield via by defining specific dimensional relationships (inscribed rectangle in a virtual rectangle with long side parallel to signal lines). This parameter optimization enhances the electromagnetic shielding effectiveness without requiring complex manufacturing processes.
2Productivity
If line intervals are reduced to increase circuit density, then productivity increases, but crosstalk between adjacent signal paths increases
Solution Approach 1:
The patent applies local quality by positioning the rectangular shield vias at specific locations between signal lines and configuring their dimensions locally to match the spacing requirements. This localized optimization provides effective crosstalk suppression even when line intervals are reduced for higher circuit density.
Solution Approach 2:
The asymmetric rectangular via shape is oriented with its long side parallel to the signal lines, creating an asymmetric shielding configuration that is more effective at suppressing crosstalk between adjacent parallel signal paths compared to circular vias, enabling tighter spacing.
3Ease of manufacture
If manufacturing accuracy varies, then ease of manufacture improves, but crosstalk suppression performance deteriorates
Solution Approach 1:
The rectangular via shape with its defined orientation (long side parallel to signal lines) provides a more robust shielding effect that is less sensitive to manufacturing tolerances. The asymmetric shape maintains its effectiveness even when positional variations occur during manufacturing, unlike circular vias which require precise positioning for optimal performance.
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
Effectively reduces crosstalk between signal supply paths and adjacent circuits, even in narrow line intervals, while minimizing the impact of manufacturing inaccuracies.
Implementation Method 1
a first shield via that is conductive, is located between the first end portion and the second end portion that are isolated from each other in a direction along the fourth surface, extends through the first insulating layer and the second insulating layer, and is connected to the first ground and the second ground
Data Source
AI summary
A high frequency circuit includes a first insulating layer; a second insulating layer stacked on the first insulating layer directly or with one or more intermediate layers interposed therebetween; a first ground disposed on a first surface that does not face the second insulating layer among the first surface and a second surface forming two surfaces of the first insulating layer; a first line having a first end portion to which a first alternating-current signal is to be supplied and a second line having a second end portion to which a second alternating-current signal is to be supplied that are disposed between the first insulating layer and the second insulating layer; a second ground disposed on a third surface that does not face the first insulating layer among the third surface and a fourth surface forming two surfaces of the second insulating layer; and a first shield via.