Laminated Transmission Line Layout for Bending and Low Radiation
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Solution Overview
Problem
Existing transmission lines face challenges in bending without breakage and minimizing unnecessary radiation when used in narrow spaces within electronic devices, especially when surrounded by other components.
Innovation Solution
A laminated transmission line structure with varying thickness sections and conductor layer configurations, including a thinner central section offset to reduce stress and a coplanar line structure to minimize radiation, ensuring the conductor length is less than half the wavelength of the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmission line member is bent to fit in narrow spaces, then adaptability is improved, but the transmission line member may break
Solution Approach 1:
The transmission line is divided into three sections with different thicknesses: a first section, a thinner second section for bending, and a third section. This segmentation allows the line to be flexible in the middle while maintaining structural integrity in the connection sections, resolving the contradiction between adaptability and reliability.
Solution Approach 2:
Different sections of the transmission line have different thicknesses to serve different functions. The second section has a smaller thickness to enable bending in narrow spaces, while the first and third sections have larger thicknesses to provide strength and prevent breakage, thus achieving both adaptability and reliability through localized property variation.
2Adaptability or versatility
If articles are arranged around the transmission line in narrow spaces, then device integration is improved, but unnecessary radiation may be generated
Solution Approach 1:
The second signal conductor layer is positioned offset in the laminated body up-down direction relative to the first and third sections, creating a staggered three-dimensional arrangement. This dimensional offset allows articles to be arranged around the transmission line while maintaining proper signal conductor spacing, thus achieving high integration without generating unnecessary radiation.
3Ease of operation
If the second section thickness is reduced to enable bending, then ease of operation is improved, but the distance from the neutral plane increases causing radiation
Solution Approach 1:
The second signal conductor layer is positioned asymmetrically offset from the center of the second section in the laminated body up-down direction. This asymmetric positioning ensures that even with reduced thickness for ease of bending, the conductor remains at an appropriate distance from the neutral plane, preventing radiation while maintaining flexibility.
Data Source
AI summary
In a transmission line, a thickness of a second section is smaller than that of a first section and of a third section. A center of the second section is above a center of the first section and a center of the third section in a laminated body up-down direction. A distance between a second signal conductor layer and a neutral plane of the second section is shorter than a distance between a first signal conductor layer and a neutral plane of the second section and a distance between a third signal conductor layer and a neutral plane of the second section in the laminated body up-down direction. A length of the second signal conductor layer between first and second interlayer connection conductors is equal to or less than about ½ of a wavelength of a high-frequency signal transmitted by the transmission line.