Annealed Quartz Glass Cloth Low Dielectric Resin Substrate
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Solution Overview
Problem
Conventional technologies fail to produce quartz glass cloths and silica powders with dielectric loss tangents close to the intrinsic level of quartz, leading to significant transmission losses in high-speed communication substrates, especially at millimeter wave frequencies, and result in substrates with inadequate tensile strength for practical use.
Innovation Solution
A low dielectric resin substrate is developed using an annealed quartz glass cloth with a dielectric loss tangent of less than 0.0010 at 10 GHz and tensile strength of 1.0 N/25 mm or more per cloth weight, combined with a silica powder having a dielectric loss tangent of less than 0.0010 at 10 GHz and an average particle size of 0.1 to 30 μm, to improve dielectric characteristics and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional quartz glass cloth or silica powder is used in resin substrates, then the substrate can be manufactured with standard dielectric properties, but the dielectric loss tangent remains high (0.0010 or more at 10 GHz), causing significant transmission loss in high-frequency communication
Solution Approach 1:
The patent applies parameter changes by precisely controlling the hydroxyl group concentration in quartz glass cloth to 1000 ppm or less through specific heat treatment processes. This parameter optimization reduces the dielectric loss tangent to below 0.0010 at 10 GHz, directly addressing the transmission loss issue in high-frequency communication substrates
Solution Approach 2:
The patent creates a composite material system by combining low-hydroxyl quartz glass cloth with specific resin matrices (epoxy, polyimide, or PTFE). This composite approach achieves synergistic effects where the quartz glass provides structural integrity and low dielectric loss, while the resin provides bonding and electrical insulation, resulting in substrates with overall dielectric loss tangent below 0.0010
2Loss of energy
If quartz glass cloth is used to reduce dielectric loss, then transmission loss improves, but the tensile strength of the substrate becomes insufficient for practical application
Solution Approach 1:
The patent optimizes the hydroxyl group concentration parameter of quartz glass cloth to 1000 ppm or less, which not only reduces dielectric loss but also improves tensile strength. The controlled heat treatment process creates a denser glass structure that simultaneously enhances both electrical and mechanical properties
Solution Approach 2:
The patent develops composite materials combining low-hydroxyl quartz glass cloth with high-strength resins. The quartz glass fibers provide tensile strength while maintaining low dielectric loss, creating a balanced substrate that satisfies both electrical performance and mechanical strength requirements for practical applications
3Loss of energy
If inorganic powder or glass cloth with low dielectric loss tangent is added to resin, then transmission loss is reduced, but available materials with dielectric loss tangent less than 0.0010 and dielectric constant of 4.0 or less are extremely limited
Solution Approach 1:
The patent changes the key parameter of hydroxyl group concentration in quartz glass to 1000 ppm or less through controlled heat treatment. This parameter optimization creates a new class of quartz glass materials with dielectric loss tangent below 0.0010, expanding the available material options for low-loss substrates
Solution Approach 2:
The patent applies local quality by treating the quartz glass cloth with specific heat treatment processes that modify the hydroxyl group distribution and concentration. This localized chemical modification creates regions with optimized dielectric properties while maintaining the overall structural integrity of the glass cloth
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 substrate achieves significantly reduced transmission loss and enhanced tensile strength, enabling its use in high-speed communication and antenna applications with minimal signal distortion, even at high frequencies, and supports high-density mounting and thinness in circuit boards.
Implementation Method 1
an annealed quartz glass cloth heat-treated at 500° C. to 1500° C.
Implementation Method 2
annealed quartz glass cloth
Implementation Method 3
a low dielectric resin substrate that uses an annealed quartz glass cloth with a low dielectric loss tangent and which is also excellent in tensile strength
Data Source
AI summary
The present invention is a low dielectric resin substrate, which is a composite including an annealed quartz glass cloth and an organic resin, where the annealed quartz glass cloth has a dielectric loss tangent of less than 0.0010 at 10 GHz, and tensile strength of 1.0 N/25 mm or more per cloth weight (g/m2). This provides a resin substrate that includes a quartz glass cloth which has a low dielectric loss tangent and which is also excellent in tensile strength.