Thread-like Conductive Projections for Signal Isolation
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Solution Overview
Problem
Existing methods for electrical isolation in compact electronic devices, such as integrated circuits and printed circuit boards, face challenges in achieving effective signal integrity and electromagnetic shielding due to space and cost constraints, particularly in high-speed and high-density applications.
Innovation Solution
A novel electrical guard structure comprising a plurality of thread-like electrically conductive projections extending transverse to the substrate surface, formed by synthesizing thread-like structures such as carbon nanotubes, which provide enhanced signal isolation and structural support, allowing for direct integration into microelectronic processes and reducing the need for post-assembly metal castings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If via-fencing technique is used for RF isolation, then electromagnetic isolation between signal traces is improved, but the space required between guard trace and signal trace increases, reducing device compactness
Solution Approach 1:
The patent transitions from planar via-fencing to three-dimensional conductive projections extending vertically from the substrate surface. These projections create electromagnetic shielding in the vertical dimension, effectively blocking electromagnetic fields without requiring additional lateral space between signal traces, thus resolving the contradiction between isolation effectiveness and device compactness
Solution Approach 2:
The patent employs composite structures combining substrate material with conductive materials forming the projections. This composite approach enables effective electromagnetic shielding with minimal material usage and reduced lateral footprint, addressing both the isolation requirement and space constraint
2Object-affected harmful factors
If metal castings or walls are used for electromagnetic shielding, then stray electromagnetic radiation is screened, but the complexity of mounting and alignment procedures increases, and cost increases
Solution Approach 1:
The patent merges the electromagnetic shielding function directly into the substrate structure by forming conductive projections that extend from the substrate surface. This integration eliminates the need for separate metal casting components and their associated mounting and alignment procedures, thereby reducing device complexity while maintaining effective electromagnetic shielding
Solution Approach 2:
The substrate itself provides the electromagnetic shielding capability through the conductive projections formed on its surface. The substrate structure serves dual purposes: as the base platform for mounting electronic components and as the electromagnetic shielding barrier, eliminating the need for additional shielding components and simplifying the overall device architecture
3Length of stationary object
If conventional surface micromachining techniques are used to build metallic walls, then the build-up thickness for metals is limited, preventing high aspect ratio structures
Solution Approach 1:
The patent changes the manufacturing approach from conventional surface micromachining to techniques capable of producing high aspect ratio structures, such as electroplating, chemical vapor deposition, or direct laser writing. These techniques enable the formation of conductive projections with aspect ratios greater than two, overcoming the thickness limitations of traditional micromachining methods
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 solution enables robust signal isolation in both vertical and lateral directions, reduces the size and weight of guard traces, and enhances thermal management, while being cost-effective and flexible, allowing for more compact and complex device designs.
Implementation Method 1
thread-like electrically conductive projections extending transverse to the substrate surface
Implementation Method 2
enhances thermal management
Data Source
AI summary
A method of fabricating an electrical guard structure for providing signal isolation is provided. The method includes providing a substrate having a mounting surface comprising a first area for hosting at least one electronic component. The method further comprises synthesizing a plurality of thread-like structures over the substrate to collectively form one or more electrically conductive projections extending transverse to the mounting surface. The one or more electrically conductive projections include one or more wall-like structures which are elongate parallel to the mounting surface. The electrically conductive projections can be transferred to another surface such as a major surface of a second substrate. There are further provided a support structure and a guard structure having the wall-like electrically conductive projections which are electrically grounded when in use to provide signal isolation.