​What should we know before choosing SMA connectors?
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​What should we know before choosing SMA connectors?

Views: 0     Author: Site Editor     Publish Time: 2022-02-17      Origin: Site

SMA connector is a kind of radio frequency connector, and each different type has its application range. Only the right choice of the right SMA connector can exert its maximum effect. The following will briefly introduce the different types of SMA connectors.


What is the difference between SMA connectors, 3.5mm connectors, 2.92 connectors, and 2.4mm connectors?

What is the development of SMA connectors?

What is the function of the SMA connector?


What is the difference between SMA connectors, 3.5mm connectors, 2.92 connectors, and 2.4mm connectors?

1. 3.5mm connector:

The 3.5mm connector is a connector with an inner diameter of the outer conductor of 3.5mm, a characteristic impedance of 50Ω, and a connection mechanism of 1/4-36UNS-2 inch threads. An obvious difference with SMA connectors (including Southwest Microwave's "Super SMA") is that 3.5mm uses an air medium.

The outer conductor of the 3.5mm connector is thicker than the SMA connector, and its mechanical strength is better than that of the SMA connector. Therefore, not only the electrical performance is better than the SMA connector, but also the mechanical durability and performance repeatability is higher than that of the SMA connector, so it is more suitable for use in the testing industry.

SMA connector

2. 2.92mm connector:

2.92mm connector (some manufacturers call this connector a 2.9mm or K-type connector, and some manufacturers call it SMK, KMC, WMP4 connector, etc.). The inner diameter of the outer conductor is 2.92mm, the characteristic impedance is 50Ω, and the connection The mechanism is a radio frequency coaxial connector with 1/4-36UNS-2 inch threads. Its structure is similar to the 3.5mm connector but smaller.

The 2.92mm connector has good electrical performance in the DC~46GHz frequency band and is mechanically compatible with SMA connectors and 3.5mm connectors. It is quickly recognized by the majority of manufacturers and has become the most widely used millimeter-wave in the world. One of the connectors.


3. 2.4mm connector:

The connector with the inner diameter of the outer conductor of 2.4mm and the impedance of 50 ohms is mechanically compatible with the 2.4mm connector, that is, the 1.85mm connector, the inner diameter of the outer conductor is 1.85mm, and the impedance of both is 50 ohms. Their inner diameter is small, so the working frequency is higher, the nominal frequency can reach 50GHz and 67GHz respectively. Remember that they must not be connected to 2.92mm, 3.5mm, or SMA connectors, otherwise, it will directly cause the consequences of connector damage.


What is the development of SMA connectors?

SMA connector is a widely used half-precision ultra-small RF and microwave connector, especially suitable for RF connections in electronic systems with frequencies up to 18 GHz or higher.

SMA connectors come in many forms, male, female, straight, right-angle, partition fittings, etc., so that they can meet most requirements. Its ultra-small size also allows it to be used, even in relatively small electronic devices.

Although it is very mature now, the use of SMA connectors may expand because many new RF systems see their operating frequencies extend well into the microwave region.


What is the function of the SMA connector?

SMA connector is a widely used small thread coaxial connector. It has the characteristics of long life, excellent performance, and high reliability. RF coaxial cable or microstrip line is widely used in microwave and digital communication equipment.

It is commonly used in the GPS interface with a map and the measurement point of the RF module in the wireless device base station.


SMA connectors play a pivotal role in modern network infrastructure. The correct selection and use of SMA connectors can help achieve better production. LenoRF has been a Chinese pioneer in RF connectors production for several years. They can provide the best SMA connectors you need. At the same time, their after-sales service is also very considerate.


Zhenjiang LenoRF Industry co. LTD- LenoRF ™ ,is a special manufacturer for RF coaxial connectors,cable assembly and Passive Devices. It occupies an area of 30 hectares with the existing building of 2000 square meters.The company is equipped with a lot of the world most advanced equipment and apparatus for production

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