The frequency range of F4B materials typically spans from 1 GHz to 40 GHz and beyond. Its high-frequency performance advantages are primarily reflected in its low dielectric constant and low dielectric loss, as detailed below:
1. Basic High-Frequency Support (1 GHz–10 GHz)
Typical applications: Mid-to-high frequency fields such as 5G communication base stations, radar systems, and satellite communications.
Performance Characteristics:
Dielectric Constant (Dk): Approximately 2.2–3.6 (for some models, such as F4BM265, Dk is 2.65 ± 0.05 at 10 GHz), with minimal variation with frequency, ensuring stable signal propagation speed.
Dielectric loss factor (Df): As low as 0.0013 at 10 GHz (e.g., F4BM265), significantly lower than standard FR-4 (Df ≈ 0.02), reducing signal attenuation.
Comparative Advantages: Compared to standard FR-4, F4B more effectively supports high-frequency signal transmission in the 1 GHz to 10 GHz range, reducing loss and crosstalk.
2. Extended High-Frequency Support (10 GHz to 40 GHz)
Typical Applications: Millimeter-wave communications (e.g., 24 GHz, 28 GHz, 39 GHz bands), automotive radar (77 GHz), medical imaging, and other ultra-high-frequency fields.
Performance Characteristics:
Dielectric Constant Stability: At 20 GHz, the Dk of F4BM265 remains stable (e.g., 2.65 ± 0.05), ensuring impedance consistency.
Dielectric Loss Control: Df is 0.0015 at 20 GHz and rises to 0.0019 at 40 GHz, yet remains far lower than that of standard FR-4 (Df of approximately 0.03 at 10 GHz), meeting the low-loss requirements for ultra-high-frequency signals.
Comparative Advantages: Compared to Rogers RO4350B (Df of 0.0037 at 10 GHz), F4B exhibits lower loss in higher frequency bands (e.g., 20 GHz to 40 GHz), making it more suitable for UHF applications.
3. Extreme High-Frequency Support (Above 40 GHz)
Typical Application Scenarios: Extreme high-frequency fields such as satellite communications and aerospace.
Performance:
Material Properties: Certain F4B variants (such as the F4BTMS300, which is a composite of PTFE, ultra-thin and ultra-fine glass fibers, and ceramics) have had their formulations optimized to extend usability beyond 40 GHz while maintaining low loss (Df of 0.0019 at 40 GHz) and low temperature drift.
Stability: Within the temperature range of -55°C to +200°C, the dielectric constant and loss factor exhibit minimal variation, ensuring signal integrity in extreme environments.
Comparative Advantages: Compared to pure PTFE materials (such as DuPont Teflon), F4B offers advantages in terms of cost and processability while meeting ultra-high-frequency performance requirements.