Multilayer Transmission Line Structure for Stable Bending Impedance
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Solution Overview
Problem
Existing signal transmission lines are difficult to bend easily, leading to challenges in flexible integration in electronic devices.
Innovation Solution
A multilayer transmission line structure with hollow portions and spacers that allow for easier bending and reduced deformation, maintaining desired characteristic impedance and minimizing dielectric loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid multilayer structure is used to maintain structural strength, then strength is improved, but ease of bending deteriorates
Solution Approach 1:
The patent introduces hollow portions (voids) within the multilayer insulator structure, creating a porous configuration that reduces overall rigidity while maintaining structural integrity. These hollow portions allow the transmission line to bend more easily without compromising the necessary strength for signal transmission and mechanical support.
2Ease of operation
If hollow portions are introduced to improve ease of bending, then ease of bending is improved, but manufacturing precision deteriorates
Solution Approach 1:
The hollow portions are segmented into discrete regions rather than continuous voids, with spacers strategically positioned to divide and support the structure. This segmentation approach simplifies the manufacturing process by allowing modular assembly while maintaining precise control over the transmission line's geometric parameters and characteristic impedance.
3Reliability
If spacers are added to maintain characteristic impedance during bending, then reliability is improved, but device complexity increases
Solution Approach 1:
Spacers are selectively positioned only in specific regions where bending occurs or where characteristic impedance maintenance is critical, rather than uniformly throughout the entire transmission line. This local application of spacers maintains reliability where needed while minimizing overall device complexity and material usage.
Data Source
AI summary
In a transmission line, a multilayer body includes a hollow portion above a signal conductor layer and below a ground conductor layer and overlapping the ground conductor layer when viewed in an up-down direction, and a spacer facing the hollow portion. In a cross section orthogonal to a front-back direction, an overlapping region is a region in the hollow portion in which the hollow portion overlaps the spacer in the up-down direction. In a cross section orthogonal to the front-back direction, a non-overlapping region is a region in the hollow portion in which the hollow portion does not overlap the spacer in the up-down direction. A length of the hollow portion in the up-down direction in the overlapping region is shorter than a length of the hollow portion in the up-down direction in the non-overlapping region.