Flexible Substrate Line Layout for Bendable Antenna Modules
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Solution Overview
Problem
Flexible substrates with overlapping first and second lines experience reduced bendability due to increased thickness, which is a concern for applications requiring flexibility.
Innovation Solution
A flexible substrate design where the first and second lines are arranged in line symmetry with a ground electrode between them, preventing overlap and allowing for equal length adjustment while maintaining bendability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the first line and the second line are disposed at positions overlapping each other in the thickness direction of the substrate, then the substrate can be made compact, but the bendability of the flexible substrate is reduced due to increased thickness
Solution Approach 1:
The patent transitions from a three-dimensional overlapping arrangement (first line and second line stacked in the thickness direction) to a two-dimensional planar arrangement (first line and second line positioned adjacently in the surface plane). This dimensional change eliminates the thickness increase caused by overlapping, thereby maintaining substrate compactness while preserving bendability.
Solution Approach 2:
The patent employs asymmetric positioning of the first line and second line relative to the ground electrode. Specifically, the first line is positioned at a first distance from the ground electrode while the second line is positioned at a second distance, where these distances are intentionally made different. This asymmetric arrangement prevents overlapping while enabling compact integration of all components in the planar configuration.
2Reliability
If the first line and the second line are arranged to be the same length, then signal transmission symmetry is improved, but the substrate complexity increases
Solution Approach 1:
The patent applies local quality by making specific portions of the first line and second line have line-symmetrical relationships with respect to each other, rather than requiring the entire lines to be identical. This localized symmetry in specific segments achieves signal transmission symmetry where needed while allowing flexibility in other portions, thereby reducing overall substrate complexity.
3Object-affected harmful factors
If the ground electrode is positioned between the first line and the second line, then electromagnetic interference is reduced, but the substrate thickness increases
Solution Approach 1:
The patent repositions the ground electrode from a vertical stacking arrangement (between first line and second line in the thickness direction) to a horizontal planar arrangement (adjacent to both lines in the surface plane). This dimensional transition eliminates the thickness increase while maintaining the ground electrode's electromagnetic shielding function through its new planar configuration.
Data Source
AI summary
A flexible substrate includes a dielectric having flexibility, a first line, a second line, and ground electrode. The dielectric has a first surface and a second surface opposed to the first surface. The first line, the ground electrode, and the second line are laminated in this order in layers from the first surface to the second surface. When the flexible substrate is seen through from the thickness direction of the flexible substrate, the first line has a line-symmetrical portion that is line-symmetrical with respect to the second line with a virtual intermediate line (LM) serving as a symmetric line.