Circuit Module Signal Isolation via Ground Strip Shielding
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Solution Overview
Problem
Existing circuit modules with insulating layers and signal conductors suffer from insufficient isolation between signal wiring lines due to signal leakage both on the surface and within the insulating layer, which affects the integrity of signal transmission.
Innovation Solution
The introduction of a ground conductor with strip portions and via conductors that connect these strips to the ground layer, strategically placed between signal conductors, enhances signal isolation by creating a shielding effect both on the surface and within the insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ground conductor with strip portion is introduced between signal conductors, then signal isolation is improved, but device complexity increases
Solution Approach 1:
The ground conductor is segmented into a planar portion and a strip portion, with the strip portion selectively positioned between signal conductors to provide targeted shielding where needed, rather than using a continuous ground plane that would increase overall complexity
Solution Approach 2:
The strip portion of the ground conductor is locally positioned between specific signal conductors that require isolation, providing enhanced signal isolation only in regions where it is most needed while maintaining simplicity in other areas
2Reliability
If the strip portion is filled into the insulating layer, then signal leakage in the insulating layer is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The recess portion is pre-formed in the insulating layer at the designated position before the strip portion is filled in, ensuring proper alignment and integration while simplifying the manufacturing process by establishing the geometry in advance
Solution Approach 2:
The strip portion is nested into the recess portion of the insulating layer, with the strip portion being filled into the pre-formed recess to create a integrated structure that suppresses signal leakage while maintaining manufacturing feasibility
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
This configuration effectively suppresses signal leakage between signal wiring lines, achieving a high degree of isolation and maintaining signal integrity even with multi-terminal electronic components, thereby improving the overall performance of the circuit module.
Implementation Method 1
the leakage of a signal between the first signal wiring line and the second signal wiring line on the main surface of the insulating layer 11 is suppressed by the ground wiring line Lc. The leakage of a signal between the first signal wiring line La and the second signal wiring line Lb in the insulating layer 11 is suppressed by the first strip portion connection via conductor 15b
Data Source
AI summary
A circuit module includes a circuit board including an insulating layer, first and second signal conductors, a ground conductor, and a ground conductor layer; and an electronic component including first and second signal terminals and a first ground terminal. The ground conductor includes a first strip portion parallel to the first and second signal conductors. When a portion of the first signal conductor parallel to the second signal conductor and the first signal terminal are set as a first signal wiring line and a portion of the second signal conductor parallel to the first signal conductor and the second signal terminal are set as a second signal wiring line, the circuit board includes a first strip portion connection via conductor that connects the first strip portion and the ground conductor layer in a region where the first and second signal wiring lines are parallel to each other.