Many users may not understand the difference between 3.5mm / 2.92mm / 2.4mm / SMA, and may encounter this problem. The 3.5mm / 2.92mm / 2.4mm connector can be seamlessly connected with SMA. So how should we distinguish these connectors? The following article will introduce you to the knowledge of these four connectors, I hope this knowledge is helpful to you.

SMA is designed for 0.141semi-rigid coaxial cable and usually filled with ptfe medium.In the army industries ,they are used as precision connectors for microwave applications.At that condition.since SMA is small in small size and can work in high frequency. (Frequency range of semi-hard cable is DC～18GHz,and the soft cable is DC～12.4GHz)They are popular quickly.Even the Millimeter wave connectors developed later (for example:3.5mm、2.92mm) also take the mechanical compatibility into consideration.

The outer diameter of the 3.5mm connectors is 3.5mm. The impedance is 50Ω. The bindiny mechanism is 1/4-36UNS-2 English thread Connector.The biggest difference betweem SMA is 3.5mm is use air dielectric.The outer conductor of 3.5mm connectors is thicker than SMA connector.The mechanical strength of 3.5mm connectors is better than SMA connectors.Not only the behaviour of electricity of 3.5mm connectors is better than SMA connectors’ .but also mechanical endurance and repeatability of performance are higher than SMA connectors.So they are suitble for used in testing industries.

The outer diameter of the 2.92mm connectors is 2.92mm.The impedance is 50Ω.The bindiny mechanism is 1/4-36UNS-2 English thread coaxial Connector.the structure of 2.92 connectors are similar with 3.5 connectors.but smaller than 3.5 connectors. 2.92 connectors’ frequency is DC～46GHz.they have good electrical property and can be compatied with SMA connectors and 3.5mm connectors.So 2.92 connectors are soon accepted by manufacturers. And became one of the most widely used millimeter wave connectors in the globle world.

The outer diameter of the 2.4mm connectors is 2.4mm.The impedance is 50Ω.The outer diameter of the 1.85mm connectors is 1.85mm.The impedance is 50Ω.They have smaller inside dimension.and higher working frequency.nominal can up to 50GHz 60GHz, this two connectors are mechanical compatible and can connect with each other. But please note that they can’t be connected with 2.92mm，3.5mm and SMA connectors.If connect with 2.92mm，3.5mm and SMA connectors.They will be broken down.

After reading the above article, you may have a good idea about the difference among 3.5mm/2.92mm/2.4mm/SMA connectors. 

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