SMA vs. 2.92 mm vs. 2.4 mm vs. 1.85 mm RF Connectors

Choosing the right RF connector is essential for maintaining signal integrity in high-frequency systems. SMA, 2.92 mm, 2.4 mm and 1.85 mm connectors are widely used in RF testing, microwave communication and precision measurement. However, they are not interchangeable simply because they look similar.

1. SMA Connectors

SMA connectors are commonly used in RF communication equipment, antennas, test instruments and coaxial cable assemblies. They offer a practical balance of size, mechanical robustness and cost.

The usable frequency range depends on the specific connector design, interface quality and cable assembly. Standard SMA products should not automatically be assumed suitable for millimeter-wave applications.

2. 2.92 mm Connectors

Also known as K-type connectors, 2.92 mm connectors are widely used in microwave test systems and high-frequency measurement. Their precision interface makes them suitable for applications requiring consistent electrical performance at frequencies beyond typical SMA applications.

3. 2.4 mm and 1.85 mm Connectors

These precision connectors are designed for higher-frequency applications, including millimeter-wave measurements. The 2.4 mm interface is commonly associated with applications up to 50 GHz, while 1.85 mm designs are commonly used up to 67 GHz. Always verify the manufacturer’s rated frequency and interface specifications.

4. What Should You Consider?

Before selecting a connector, check:

• Maximum operating frequency

• Impedance, usually 50 ohms for these RF systems

• Return loss or VSWR

• Mating-interface compatibility

• Cable type and mechanical requirements

• Environmental and durability requirements

Never mate connectors based on appearance alone. Similar-looking interfaces may have different dimensions and can be damaged by improper mating.

Conclusion

The best RF connector is the one that matches the frequency, interface, measurement accuracy and mechanical requirements of the system. For demanding applications, verify the complete connector specification rather than relying on the connector name alone.

Explore ORVEX RF’s RF coaxial connectors to review available connector families and discuss your application requirements.