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What is the typical impedance of a micro coaxial cable - Micro Coaxial Cable factory-(FRS)

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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.


What Is a Micro Coaxial Cable?

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:

  • Medical devices (e.g., endoscopes)
  • Drones and robotics
  • High-speed data communication (e.g., HDMI, USB)
  • Military and aerospace systems

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.


What Is Impedance, and Why Does It Matter?

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.


Typical Impedance of Micro Coaxial Cables

Most micro coaxial cables are designed with ​50 Ω or 75 Ω impedance:

  1. 50 Ω Cables
    • Common in radio frequency (RF) systems, wireless communications, and test equipment.
    • Balances power handling and signal loss for high-frequency applications.
  2. 75 Ω Cables
    • Widely used in video transmission (e.g., CCTV, TV antennas) and digital audio.
    • Optimized for minimal signal attenuation over longer distances.

Why Are 50 Ω and 75 Ω Standards?

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.


How to Choose the Right Impedance

  1. Match Your Device Requirements
    Check your equipment’s specifications. Using a 50 Ω cable with a 75 Ω system (or vice versa) can degrade performance.
  2. Consider Signal Frequency
    • For RF, radar, or Wi-Fi (above 1 GHz), 50 Ω is typical.
    • For video, cable TV, or digital audio, 75 Ω is standard.
  3. Shielding and Flexibility
    Micro coax often includes multi-layer shielding (e.g., braided + foil) to prevent interference. For bend-heavy applications (e.g., robotics), choose a highly flexible variant.

Testing and Verifying Impedance

To ensure your cable meets specifications:

  • Use a ​Time Domain Reflectometer (TDR) to measure impedance.
  • Consult manufacturer datasheets for certified values (e.g., Huber+Suhner, TE Connectivity).

Key Takeaways

  • Most micro coaxial cables have ​50 Ω or 75 Ω impedance.
  • 50 Ω is ideal for RF and high-frequency systems.
  • 75 Ω excels in video and long-distance signal transmission.
  • Always match cable impedance to your devices for optimal performance.

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