What's the difference between SMA and 2.92mm connectors?

SMA and 2.92mm connectors differ in the following aspects:

1.Appearance and Structure

Outer Conductor Size: The outer - conductor inner diameter of SMA connectors is relatively large, while that of 2.92mm connectors is 2.92mm, which is smaller.

Insulation Medium: SMA connectors use polytetrafluoroethylene as the insulation medium, while 2.92mm connectors adopt air medium.

Connection Method: Both use 1/4 - 36UNS - 2 inch - sized threaded connection, but the 2.92mm connector has 4 slots in the jack, with good elasticity, and the insertion force is only 0.5 pounds (2.224N), which can greatly reduce the wear of the inner conductor.

2.Electrical Performance

Frequency Range: The frequency range of SMA connectors is generally DC - 18GHz, and some precision versions can reach 26.5GHz. The 2.92mm connector can work in the frequency range of DC - 40GHz, and some models can reach 44GHz, which has better high - frequency performance.

Insertion Loss: 2.92mm connectors have lower insertion loss, which is especially suitable for applications with high requirements for signal transmission loss. SMA connectors have relatively higher insertion loss, which can meet general RF connection needs.

3.Application Scenarios

SMA Connectors: Due to their small size, stable connection, and wide application in the microwave field, they are widely used in the GPS clock interface of wireless devices, the RF module test ports of base stations, and other occasions.

2.92mm Connectors: Because of their excellent high - frequency performance and reliability, they are more suitable for high - end applications such as millimeter - wave communications, radar systems, and high - precision test instruments.

Cost: Due to their higher performance and larger size, 2.92mm connectors are generally more expensive than SMA connectors. SMA connectors are relatively cost - effective, suitable for general applications and projects with limited budgets.