Vehicle Radar Penetration Cover Composition
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Solution Overview
Problem
Conventional radar penetration covers for vehicles face a trade-off between mechanical physical properties and dielectric properties, with glass fiber reinforcement improving mechanical properties but deteriorating dielectric properties, leading to beam distortion and reduced radar penetration performance.
Innovation Solution
A composition comprising 60-70 wt% polybutylene terephthalate (PBT), 10-20 wt% polycarbonate (PC), and 11.5-27.8 wt% additive including polypropylene (PP) with maleic anhydride (MAH) grafted to the end group and glass fiber (GF), along with carbon black, which adjusts the content and type of glass fiber to maintain excellent mechanical and dielectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass fiber content is increased to improve mechanical properties, then mechanical strength and stiffness are improved, but dielectric properties deteriorate causing beam distortion
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass fiber content within 10-20 wt% and using carbon black with specific surface area (50-200 m²/g) and content (0.1-1.0 phr). This optimization balances mechanical reinforcement with dielectric performance, preventing beam distortion while maintaining structural strength.
Solution Approach 2:
The patent uses composite materials by combining PBT base resin with glass fiber reinforcement and carbon black additive. This multi-component composite system leverages the strength of glass fiber while using carbon black to counteract dielectric deterioration, achieving both mechanical integrity and radar penetration performance.
2Strength
If glass fiber content is increased to improve mechanical properties, then impact resistance is improved, but dielectric loss increases reducing beam detection distance
Solution Approach 1:
The patent introduces carbon black as an intermediary substance that mediates between glass fiber reinforcement and dielectric performance. The carbon black particles counterbalance the dielectric loss caused by glass fiber, allowing high impact resistance while maintaining low dielectric loss for accurate beam detection.
Solution Approach 2:
The patent optimizes parameters by limiting glass fiber to 10-20 wt% and adding carbon black at 0.1-1.0 phr with specific surface area 50-200 m²/g. This parameter control ensures sufficient impact resistance while minimizing dielectric loss to preserve beam detection distance.
3Ease of manufacture
If radome dimension is distorted, then manufacturing flexibility is improved, but beam pattern distortion occurs reducing measurement precision
Solution Approach 1:
The patent employs composite materials with PBT base resin, glass fiber (10-20 wt%), and carbon black (0.1-1.0 phr) to achieve dimensional stability. The reinforced composite structure prevents radome distortion during manufacturing and service, ensuring accurate beam patterns for precise radar measurement.
Solution Approach 2:
The patent applies parameter changes by optimizing glass fiber content (10-20 wt%) and carbon black specifications (surface area 50-200 m²/g, content 0.1-1.0 phr). This creates a composite material with sufficient rigidity to maintain radome dimensional stability, preventing beam pattern distortion while allowing manufacturing flexibility.
Data Source
AI summary
Disclosed are a composition for a radar penetration cover of a vehicle which may improve dielectric properties while maintaining excellent mechanical physical properties, and the radar penetration cover including the same.The composition for a radar penetration cover includes: an amount of about 60 to 70 wt % of polybutylene terephthalate (PBT), an amount of about 10 to 20 wt % of polycarbonate (PC), and an amount of about 11.5 to 27.8 wt % of an additive including polypropylene (PP) having maleic anhydride (MAH) grafted to an end group and a glass fiber (GF), wt % based on the total weight of the composition.