Overview
Double shielded RF cable is a coaxial cable variant engineered for critical radio frequency (RF) applications where signal integrity is paramount. Unlike single-shielded cables, it incorporates two distinct shielding layers—usually a combination of braided metal mesh and aluminum foil—to block electromagnetic interference (EMI) and radio frequency interference (RFI). Commonly used in frequencies ranging from 1 MHz to 18 GHz, these cables are indispensable in industries like telecom infrastructure, aerospace, and medical imaging. Their design ensures minimal signal attenuation (<0.5 dB/m at 1 GHz) and consistent impedance (typically 50 Ω or 75 Ω), making them ideal for high-precision systems.
Structure and Working Principle
The cable's core consists of a solid or stranded copper conductor, insulated by dielectric materials like polyethylene (PE) to maintain impedance stability. The first shielding layer is typically a spiral-wrapped aluminum foil, which provides 100% coverage against high-frequency interference. Overlapping this is a braided copper or tinned copper mesh (80-95% coverage) to handle low-frequency EMI. When RF signals pass through the conductor, the dual shields create a Faraday cage effect, reflecting external interference while containing internal signals. The outer jacket, often PVC or LSZH (low-smoke zero-halogen), adds environmental protection. Advanced variants may include drain wires for easier grounding.
Key Features
Shielding effectiveness is the standout feature, with double-shielded cables offering ≥90 dB attenuation of interfering signals—significantly higher than single-shielded types (60-70 dB). They also exhibit lower capacitance (≈50 pF/m) and reduced skin effect losses at high frequencies. Durability is another advantage; the braid-foil combination resists flex fatigue better than foil-only designs. Temperature tolerance ranges from -40°C to +85°C for standard versions, with specialized jackets extending this further. Customizable options include waterproofing, UV resistance, and armored variants for harsh industrial environments.
Application Areas
In telecommunications, these cables connect cellular base stations and satellite antennas, where signal clarity is critical. Broadcast studios use them for HD video feeds and audio transmission to avoid noise artifacts. Industrial applications include MRI machines and radar systems, where EMI from nearby equipment could distort diagnostic data. Military and aerospace sectors rely on double-shielded cables for avionics and encrypted communications, often with additional specifications like MIL-DTL-17 compliance. Emerging 5G infrastructure deployments are driving demand for high-frequency versions (up to 40 GHz) with low latency.
Maintenance and Precautions
Proper installation is crucial: avoid bending radii smaller than 5x the cable diameter to prevent shield fractures. Ground both shield layers at one end to eliminate ground loops, using EMI gland connectors for optimal performance. Regularly inspect for jacket damage—exposed shielding can corrode and degrade signal quality. For long runs, use amplifiers to compensate for attenuation rather than increasing cable thickness unnecessarily. In corrosive environments (e.g., offshore rigs), specify tinned copper braids and polyurethane jackets. Store coils vertically to prevent kinking.
B2B Procurement Guide
Bulk buyers should prioritize certified suppliers (e.g., ISO 9001, UL/CE listings) with traceable materials. Key specs to request include: shielding density (braid coverage %), velocity of propagation (≥80% for most RF apps), and VSWR (Voltage Standing Wave Ratio; <1.5:1 ideal). MOQs typically start at 1,000 meters, with lead times of 2-4 weeks for custom configurations. Negotiate pricing based on copper market trends—cables with higher braid density (e.g., 95% vs. 80%) may cost 20-30% more. Sample testing for insertion loss and phase stability is recommended before large orders.
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