Low Dielectric Substrate for Millimeter-Wave Signal Stability
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Solution Overview
Problem
Existing substrates for high-speed millimeter-wave communication face challenges in achieving uniform dielectric characteristics, leading to significant transmission loss and skew due to variations in dielectric loss tangent and constant between organic resin and quartz glass cloth or silica powder, which are difficult to adjust effectively.
Innovation Solution
A low dielectric substrate comprising a quartz glass cloth with a dielectric loss tangent of 0.0001 to 0.0015 and a dielectric constant of 3.0 to 3.8, combined with an organic resin having a dielectric loss tangent within 80% to 150% and a dielectric constant within 50% to 110% of the quartz glass cloth, and optionally including a silica powder with similar characteristics, to ensure uniform dielectric properties and reduced transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the dielectric loss tangent and dielectric constant of the organic resin are reduced to minimize transmission loss, then transmission loss is improved, but the deviation from dielectric characteristics of the glass cloth increases, causing larger skew and transmission loss
Solution Approach 1:
The patent changes the dielectric parameters of the glass cloth by selecting specific glass types (D glass, NE glass, L glass) with optimized composition to achieve dielectric loss tangent of 0.002-0.005 and dielectric constant of approximately 5 at 10 GHz or higher, matching the organic resin characteristics
Solution Approach 2:
The patent creates a composite material system where the organic resin and glass cloth are designed to have compatible dielectric characteristics, with the glass cloth serving as reinforcement while maintaining uniform dielectric properties throughout the laminated plate structure
2Reliability
If conventional techniques are extended for high-speed substrates over 25 GHz, then manufacturing complexity is maintained, but signal quality cannot be ensured due to increased transmission loss and skew
Solution Approach 1:
The patent optimizes the dielectric parameters of both organic resin and glass cloth to achieve uniform dielectric characteristics throughout the laminated plate, ensuring signal quality for high-speed communication over 25 GHz while using standard manufacturing processes
3Reliability
If wiring is tilted relative to the fiber direction of the glass cloth or fibrillated glass cloth is used to reduce skew, then skew is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the dielectric parameters of the glass cloth to match the organic resin, achieving uniform dielectric characteristics that eliminate skew without requiring tilted wiring or special fibrillated glass cloth structures, thereby maintaining ease of manufacture
Data Source
AI summary
A low dielectric substrate for high-speed millimeter-wave communication includes a quartz glass cloth with a dielectric loss tangent of 0.0001 to 0.0015 and a dielectric constant of 3.0 to 3.8 at 10 GHz, and an organic resin with a dielectric loss tangent within 80% to 150% of the dielectric loss tangent of the quartz glass cloth at 10 GHz and a dielectric constant within 50% to 110% of the dielectric constant of the quartz glass cloth at 10 GHz. This provides a low dielectric substrate for high-speed millimeter-wave communication where the low dielectric substrate makes it possible to send signals that are stable and have excellent quality with no difference in propagation time between wirings even if the substrate has an uneven resin distribution and the quartz glass cloth above and below the wirings, and the difference in dielectric loss tangent between members has been reduced to lower transmission loss.