RF Cable

An RF cable, or radio frequency cable, is a specialized type of electrical cable designed to transmit high-frequency alternating current (AC) signals with minimal loss and distortion. Unlike standard electrical wires, RF cables are engineered with precise impedance characteristics to ensure efficient power transfer and signal integrity, particularly in the radio and microwave frequency ranges. Their primary function is to connect components within RF systems, such as antennas to receivers, transmitters to power amplifiers, or test equipment to devices under test.

The construction of an RF cable typically involves a central conductor, an insulating dielectric material, a metallic shield (often braided or foil), and an outer protective jacket. This coaxial design is crucial for preventing electromagnetic interference (EMI) from affecting the signal and for containing the signal within the cable, thus minimizing radiation outwards. Key performance parameters for RF cables include impedance (most commonly 50 ohms or 75 ohms), attenuation (signal loss over distance), shielding effectiveness, and velocity of propagation.

RF cables are fundamental to the operation of countless modern technologies, including wireless communication systems, broadcasting equipment, radar installations, and test and measurement setups. Choosing the correct RF cable is critical for system performance, as an improperly matched or specified cable can lead to significant signal reflections, power loss, and degradation of signal quality. By providing a reliable and controlled path for high-frequency signals, RF cables are indispensable components for ensuring the efficiency and accuracy of any RF-dependent application.