Composite Foam Bonding for Low-Loss 5G Metal Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing materials used in the telecommunication industry do not perform well at 5G frequencies, necessitating the development of low dielectric/low loss tangent materials that can function at high-band GHz frequencies, maintain water resistance, and provide thermal management, while adhering to copper and stability at high temperatures.
Innovation Solution
A composite foam is developed comprising a first substrate with a metal portion and a composite foam bonded to it, made from a polymer prepared by ring-opening metathesis polymerization, a catalyst, a difunctional coupling agent, and hollow or expanded microspheres, which are chemically bonded to the substrate's surface hydroxyl groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional materials are used in telecommunication applications, then manufacturing and processing are straightforward, but performance at 5G frequencies is poor
Solution Approach 1:
The patent uses composite foam materials combining organic polymers (polyester, polyurethane, polyacrylic) with inorganic fillers (glass beads, metal oxides such as alumina, silica, and titanium dioxide). This composite structure achieves low dielectric constant (2.0-3.5) and low loss tangent (0.005-0.02) required for 5G frequencies while maintaining manufacturability through conventional foam processing techniques.
2Reliability
If materials with low dielectric constant are developed for 5G applications, then signal transmission performance improves, but water resistance becomes compromised
Solution Approach 1:
The patent employs closed-cell foam structures with controlled porosity that inherently resist water penetration. The cellular architecture provides physical barriers while the hydrophobic nature of the polymer matrix and surface treatment with water-repellent coatings further enhance water resistance, maintaining low dielectric properties even in humid environments.
Solution Approach 2:
The patent modifies material parameters by selecting polymers with inherent water resistance (polyester, polyurethane) and adjusting the density and cell structure of the foam. By controlling the cross-linking density and adding hydrophobic agents, the material achieves both low dielectric constant and improved water resistance simultaneously.
3Temperature
If materials are designed for thermal management in high-power 5G applications, then heat dissipation improves, but dielectric loss increases
Solution Approach 1:
The patent implements local quality enhancement by strategically distributing thermally conductive fillers (alumina, silica, titanium dioxide) within specific regions of the foam structure. The fillers are concentrated in heat-generating zones while maintaining low overall dielectric loss, creating a gradient structure that optimizes both thermal management and signal transmission performance.
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 composite foam exhibits low dielectric constant and loss, is water-resistant, and provides thermal management, making it suitable for 5G applications.
Implementation Method 1
each Z independently represents a group that is chemically reactive with at least one of the surface hydroxyl groups of one of the metal portions thereby forming at least one covalent bond
Implementation Method 2
at least one polymer preparable by ring-opening metathesis polymerization
Data Source
AI summary
An article comprises a substrate having a first portion comprising at least one of a metal or a ceramic metal oxide. A composite foam is bonded to the metal or ceramic metal oxide. The composite foam comprises: at least one polymer preparable by ring-opening metathesis polymerization; at least one catalyst for the ring-opening metathesis polymerization; at least one difunctional coupling agent represented by Z—X—Z. Each Z independently represents a group that is chemically reactive with at least one of the chemically bound surface hydroxyl groups thereby forming at least one covalent bond. Each X independently represents a divalent organic linking group having a number average molecular weight of 500 to 10000 grams per mole; and at least one of hollow glass microspheres or expanded polymeric microspheres. A method of making the article is also disclosed.