RF Cables

An RF (Radio Frequency) cable is a specialized coaxial cable designed to transmit high-frequency signals with minimal loss and interference. These cables are used to connect antennas, transmitters, receivers, and RF instruments in communication and test systems.

Common types include:

• Coaxial cables (e.g., RG-58, RG-142, RG-400)

• Semi-rigid cables for high-frequency stability

• Flexible cables for general-purpose use

• Low-loss cables (e.g., LMR series) for long-distance signal transmission

An RF cable carries alternating current (AC) signals along its center conductor while the outer shield prevents electromagnetic interference (EMI). The dielectric insulator between them maintains a consistent impedance and minimizes signal reflection.

Impedance (measured in ohms) represents the opposition to signal flow in the cable.

• 50-ohm cables are used for RF communications and test equipment.

• 75-ohm cables are used for video, broadcast, and CATV systems.

Matching the system’s impedance ensures minimal signal reflection and power loss.

Key factors include:

• Frequency range

• Cable length

• Attenuation (signal loss)

• Shielding effectiveness

• Temperature and environmental conditions

• Connector quality

Attenuation is the signal loss that occurs as the signal travels through the cable. It’s measured in decibels (dB) per unit length and increases with frequency and cable length. Low-loss cables minimize this effect.

When selecting an RF cable, consider:

• Operating frequency

• Required cable length

• Power handling capability

• Flexibility needs (rigid vs. flexible)

• Environmental exposure (indoor, outdoor, high-temperature, etc.)

• Connector compatibility

• Flexible RF cables use braided shields and are easy to route but may have slightly higher loss.

• Semi-rigid RF cables use a solid metal outer conductor, offering superior shielding and phase stability, ideal for high-precision or high-frequency applications.

To reduce loss:

• Use shorter cable lengths

• Choose low-loss cable types

• Ensure proper impedance matching

• Use high-quality connectors and secure terminations

• Avoid sharp bends or physical damage to the cable

RF cables are used in:

• Wireless communication systems

• Antenna and radar connections

• Test and measurement setups

• Broadcasting and satellite systems

• Aerospace and defense electronics

• IoT and 5G infrastructure

Longer cables generally result in higher insertion loss, which can degrade signal strength. It’s important to select a cable type and length that balances flexibility with acceptable signal attenuation.

RF cables can be terminated with various connectors such as SMA, N-Type, TNC, BNC, and 2.92mm, depending on system compatibility and frequency requirements.

To place an order for RF cable or any other passive products please contact us and we will help you!