A coaxial cable is a type of cable widely used in communication and data transmission. Its core structure consists of four concentric layers:
Central Conductor: Typically a single or stranded copper wire for transmitting electrical signals.
Insulating Layer: A plastic or foam material (e.g., polyethylene) surrounding the conductor, acting as a dielectric14.
Shielding Layer: A braided or foil metallic conductor (e.g., copper, aluminum) that isolates external electromagnetic interference.
Outer Jacket: The outermost protective insulation layer, usually made of PVC or flame-retardant materials15.
Classification and Characteristics
Impedance Types:
50Ω Baseband Cables: Primarily used for digital signal transmission (e.g., local area networks, short-distance communication)4.
75Ω Broadband Cables: Suitable for high-frequency analog signals (e.g., cable television, video surveillance)14.
Technical Parameters:
Cutoff Frequency: Determines the maximum signal transmission frequency, dependent on cable diameter and material2.
Shielding Performance: Double-layer shielding significantly reduces signal attenuation and crosstalk
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