Multilayer Substrate Curved State Retention via Ground Conductor Plastic Deformation
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Solution Overview
Problem
Existing multilayer substrates experience fluctuations in electrical characteristics when bent due to stray capacitance between metal plates and conductor patterns, leading to undesirable deformation states.
Innovation Solution
A multilayer substrate design featuring a main body with stacked insulating sheets, a signal wire, and strategically positioned first and second ground conductors that overlap the signal wire, allowing the substrate to retain a curved state through plastic deformation of the ground conductors without affecting electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a metal plate is used to retain a folded state in a flexible printed substrate, then the substrate can maintain a curved state, but stray capacitance is formed between the metal plate and conductor pattern causing electrical characteristic deviations
Solution Approach 1:
The invention extracts the problematic metal plate from the system and replaces it with ground conductors that are electrically connected to a reference potential. This removal of the metal plate eliminates the source of stray capacitance while the ground conductors maintain the curved state through plastic deformation, thus resolving the contradiction between shape retention and electrical stability.
Solution Approach 2:
The invention introduces ground conductors as an intermediary element between the insulating sheets. These ground conductors serve as a mediator that can be plastically deformed to retain the curved state while being electrically connected to ground potential, thereby preventing stray capacitance formation and maintaining electrical characteristic stability.
2Device complexity
If the metal plate and conductor pattern are placed close to each other for structural integration, then device complexity is reduced, but stray capacitance increases causing electrical characteristic deviations
Solution Approach 1:
The invention removes the metal plate from the close proximity of conductor patterns and replaces it with ground conductors. This extraction eliminates the stray capacitance issue that arises from close placement while maintaining structural integration through the ground conductor design that can be positioned without causing electrical interference.
Solution Approach 2:
The invention applies different functional qualities to different parts of the substrate. The ground conductors are specifically designed with local ground potential connection to prevent stray capacitance, while the signal conductor patterns maintain their signal transmission function. This local differentiation of electrical characteristics allows close placement without electrical interference.
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
The substrate maintains a curved state with increased stability and retains original electrical characteristics, unlike previous designs that deviate from desired values upon bending.
Implementation Method 1
the main body containing the single wire retains a curved state by plastic deformation of the first and second ground conductors
Data Source
AI summary
A multilayer substrate that retains a curved state without causing fluctuations in electrical characteristics includes a main body including a plurality of insulating sheets to be stacked and made of a flexible material. A signal wire extends in the main body. A ground conductor is provided at a positive-direction side in a z-axis direction relative to the signal wire in the main body, and overlaps the signal line in a plan view seen from the z-axis direction. A ground conductor is provided on a negative-direction side in the z-axis direction relative to the signal wire in the main body, and overlaps the signal line in a plan view seen from the z-axis direction. The state in which the main body is curved so that the signal wire defines an arc is retained by plastic deformation of the ground conductors.