Typical Characteristic Impedance of an RF Coaxial Cable The characteristic impedance of a widely used RF coaxial cable is approximately:

Introduction / Context:
Common RF systems standardize on specific characteristic impedances to ensure component interoperability and minimal reflections.

Given Data / Assumptions:

• “RF coaxial cable” refers to general-purpose coax for transmit/receive paths (laboratory, radio, cellular).
• Matched systems target a uniform impedance.

Concept / Approach:

Two common impedances are 50 Ω (general RF, power handling) and 75 Ω (video, CATV, low-loss receive). The most widely used standard in RF test, radios, and antennas is 50 Ω.

Step-by-Step Solution:

Verification / Alternative check:

Examples: RG-58, RG-213, and modern low-loss coaxial cables use 50 Ω.

Why Other Options Are Wrong:

300 Ω is twin-lead, not coax; 5 Ω and 2 Ω are unrealistic for practical coax; 150 Ω is uncommon.

Common Pitfalls:

Confusing 75 Ω video distribution cables with general RF coax defaults.

Final Answer:

50 Ω