What are RG213 Coaxial Cables?

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- everything RF

Jan 23, 2023

RG213 Coaxial Cables are a type of cable that has been designed for high frequency signal transmission. They exhibit high signal integrity and low signal attenuation making them ideal for long-range communication and networking applications


RG213/U Cable Construction

The RG213/U is a 50-ohm coaxial cable with an overall diameter of 0.405 inches and a voltage rating of up to 5000 Vrms. It consists of an inner bare copper wire (carrying the electrical signal) with 7-stranding construction. The inner conductor is enclosed by an insulation layer made of Polyethylene (PE). The insulation layer is then completely enclosed by 1 bare copper braid shield that forms the outer conductor and also provides shielding against electromagnetic interference (EMI). Finally, the structure is covered with an outermost layer - called a jacket - made of Polyvinyl Chloride (PVC).  The jacket protects the cable core from mechanical, moisture, and chemical issues.

The RG213/U cable exhibits capacitance of approximately 31 pF/ft (101.97 pF/m), and signal attenuation of around 5.5 dB/100 ft at 400 MHz (signal attenuation of the cable depending on the frequency), and a velocity of propagation of 66 %. It has a center conductor measuring 0.0888 inches (2.25 mm) in diameter and an insulation layer measuring 0.285 inches (7.2 mm) in diameter. This cable is ideal for use in broadband transmission of radio, TV, video, and data signals.

Key Specifications of RG-213/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

50 ohms

Maximum Voltage Rating (RMS)

5000 V

Cable Capacitance (pF/ft)


Inductance (nH/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Polyethylene (PE)

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