When working with electronics, robotics, or high-frequency communication systems, understanding the properties of cables is crucial. One common question is: What is the typical impedance of a micro coaxial cable? In this article, we’ll break down the answer in simple terms, explain why impedance matters, and help you choose the right cable for your needs.
Micro coaxial cables are miniature versions of traditional coaxial cables, designed for high-frequency signal transmission in compact spaces. They’re widely used in applications like:
These cables have a central conductor, insulating dielectric layer, shielding, and an outer jacket. Their small size (often less than 1 mm in diameter) makes them ideal for tight spaces without sacrificing performance.
Impedance (measured in ohms, Ω) describes the resistance a cable offers to alternating current (AC) signals. It’s critical for signal integrity: mismatched impedance can cause reflections, signal loss, or distortion, especially in high-frequency applications like video transmission or RF systems.
Most micro coaxial cables are designed with 50 Ω or 75 Ω impedance:
The 50 Ω standard emerged from mid-20th-century RF engineering as a compromise between power handling and low loss. The 75 Ω standard was adopted for broadcast TV due to its lower attenuation at video frequencies. These standards ensure compatibility between devices and cables.
To ensure your cable meets specifications:
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