What is a micro coaxial cable?

# What is a micro coaxial cable?

> Meta Description: A micro coaxial cable carries high-frequency signals in tiny spaces. Learn where they're used, what to check, and how B2B buyers source them.

> Target Keyword: micro coaxial cable

If you've ever opened a smartphone or watched a surgeon navigate an endoscope, you've been near a micro coaxial cable without knowing it. These cables are thinner than a grain of rice yet carry signals at frequencies that would degrade instantly on ordinary wire. As 5G devices, ADAS cameras, and minimally invasive medical tools proliferate, the global micro coaxial cable market is projected to exceed $2.8 billion by 2028, according to industry forecasts. But for B2B buyers, the challenge isn't knowing they exist—it's specifying the right one without overpaying or underperforming.

## What makes a cable "micro" coaxial

A standard coaxial cable has four layers: a center conductor, a dielectric insulator, a metallic shield, and an outer jacket. A micro coaxial cable shrinks all four. Where a typical RG-6 cable measures 6.9mm in diameter, micro coax often falls between 0.3mm and 1.0mm. The center conductor can be as thin as 46 AWG—thinner than a human hair. The shield may be a served wire, a braid, or a metallized film, depending on the flexibility and shielding effectiveness required.

The critical property is controlled impedance. Most micro coax is designed for 50 ohms, though 75-ohm versions exist for video. At gigahertz frequencies, any variation in spacing between the center conductor and the shield causes signal reflection. That's why micro coax is manufactured on precision extrusion lines, not generic wire machines. 

## Where they show up in real deployments

Consumer electronics dominate volume. Every modern smartphone uses micro coax to connect the camera module, display, and antenna board. A flagship phone may contain six to ten separate micro coax assemblies, each with a different length and connector angle. The cables must survive millions of folding cycles in a hinge or slider.

Medical imaging is the fastest-growing segment. Endoscope cameras, ultrasound probes, and intravascular catheters rely on micro coax because it delivers high-resolution video through a channel just a few millimeters wide. In these applications, a single cable failure can abort a procedure, so reliability testing is non-negotiable.

Automotive ADAS uses micro coax for camera and radar links. A single vehicle can have eight or more cameras, each requiring a shielded cable that withstands vibration, temperature cycling, and electromagnetic interference from the electric drivetrain. Aerospace and defense use them in avionics and satellite systems, where weight and signal integrity both matter. 

## What B2B buyers must specify

When you request quotes, don't just ask for "micro coax." Define four parameters. First, impedance and frequency range: 50 ohms up to 6 GHz, or 75 ohms up to 3 GHz? Second, connector type: I-PEX MHF, Hirose U.FL, or a custom overmolded housing? Third, bend radius and flex life: static installation or continuous motion? Fourth, shielding effectiveness in dB at the highest frequency.

Ask for insertion loss and return loss data, not just a datasheet claim. A reputable supplier will provide S-parameter files or a third-party test report. At 6 GHz, a poorly made micro coax can lose 3 dB or more over 300mm—enough to degrade a camera's signal-to-noise ratio. 

## Common mistakes we see in sourcing

As a trading partner working with global B2B clients, we've handled hundreds of micro coax orders. Three failures repeat. First, buying on price alone and discovering the impedance tolerance is ±10% instead of ±5%. Second, ignoring the connector-to-cable interface: a U.FL connector rated for 1.5mm cable won't mate properly with a 0.8mm cable, causing intermittent opens. Third, underestimating bend radius: forcing a 0.5mm cable around a 1mm radius cracks the shield and changes impedance.

We pre-qualify factories on their extrusion tolerance, connector crimp height, and test capability. For project orders, we supply sample assemblies with full S-parameter reports so your engineers can validate performance in the actual device before committing to volume.

If you're sourcing micro coaxial cables for a consumer, medical, or automotive program, start with the electrical requirements—not the price per piece. Tell us the impedance, frequency, connector, and flex requirement. We'll send a material and construction recommendation, plus a sample kit for your lab.