4D-FB Coaxial Cable

The 4D-FB coaxial cable is a specific type within the family of "D-FB" cables, where the nomenclature indicates its size and construction.

The 4D-FB coaxial cable is a high-performance, low-loss, and highly flexible 50-ohm cable. Its primary advantages are its excellent balance of signal efficiency, physical flexibility, and cost-effectiveness. It is the ideal choice for modern wireless applications where space is limited, and routing is complex, but performance cannot be compromised, serving as a superior replacement for basic cables like RG-58 in professional settings.

1.Impedance: 50 ohms. This is the standard for most radio communication equipment.High Porosity /Low Density:
2.Center Conductor: Typically made of bare copper or copper-clad steel (CCS), with a diameter of approximately 1.38 mm.
3.Dielectric: Made from Foamed Polyethylene (FPE) using the FB process. Its diameter is the namesake ~4.0 mm.
4.Shielding: It typically uses a combination of:
a.Aluminum-Polyester Tape (APT): Provides 100% coverage against high-frequency interference
b. Tinned Copper Braid: Offers mechanical strength and low-frequency shielding. This dual shielding is very effective.
5. Outer Jacket: Usually made of PVC (for general use) or PE / LSZH(for outdoor use). The total outer diameter is typically around 5.9 - 6.3 mm.
6. Capacitance: Very low, typically around 80 pF/m.

1. Excellent Low-Loss Performance for its Size:
The foamed dielectric has a very low dielectric constant, resulting in significantly lower signal attenuation (loss) compared to common coaxial cables like RG-58.
It provides a great balance of performance and size, allowing for efficient signal transmission over short-to-medium distances without the bulk of larger cables.
2. Superior Flexibility and Easy Installation:
This is a primary advantage over larger cables like 8D-FB or 1/2" rigid lines. Its ~6mm outer diameter makes it highly flexible and easy to route around tight corners, through conduits, and in space-constrained environments like equipment racks or vehicles.
3. Effective Shielding and Noise Immunity:
The combination of aluminum tape and copper braid provides excellent protection against Electromagnetic Interference (EMI), ensuring a clean signal is transmitted and received. This is crucial for system reliability.
4. Stable Electrical Characteristics:
The rigid "Skin-Bone" structure of the FB dielectric ensures the cable's physical dimensions remain stable under bending. This maintains a stable 50-ohm impedance, leading to a low Voltage Standing Wave Ratio (VSWR) and minimal signal reflections.
5. Moisture Resistance:
The closed-cell nature of the FB foam dielectric acts as a barrier, preventing moisture from traveling along the cable, which is a common cause of performance degradation and failure.
6. Cost-Effectiveness:
For the performance it offers, 4D-FB is a very cost-effective solution. It provides a significant upgrade over basic cables without the high cost and installation challenges of much larger feeder cables.

Due to its excellent balance of performance, size, and cost, the 4D-FB cable is commonly used in:

In-Building Wireless (IBW) / Distributed Antenna Systems (DAS): Perfect for distributing cellular signals throughout offices, hotels, and other buildings where flexibility is key.

Radio Communication Jumper Cables: Used as short, flexible connections between a radio unit and an antenna or a larger feeder line.

Small Cell and Microcell Deployments: Ideal for the short feeder runs in compact urban telecommunications equipment.

GPS and Satellite Antenna Feeder Cables: Where low loss and flexibility are important.

*The attenuation is typical value, Maximum value shall be 105% of the nominal attenuation value.

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