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Electronic Components -What Is Sma Connector

Electronic Components -What Is Sma Connector

November 09 , 2023 0

In the RF and microwave industry, RF coaxial connectors are mainly used to transmit RF signals, and their transmission frequency range is very wide, up to 18GHz or higher, mainly used in radar, communications, data transmission and aerospace equipment. The SMA coaxial connector (or SMA for short) is the most common type of coaxial connector in the radio frequency, microwave, and millimeter wave (mmW) industries. This article mainly introduces the SMA connector

I.SMA Connector Introduction

SMA is commonly used to provide RF connections between circuit boards, and many microwave components include filters, lighteners, mixers, and oscillators. The connector has a threaded external connection that has a hexagonal shape and allows tightening with a wrench. They can be tightened to the correct tightness using a special torque spanner 9 so that a good connection can be achieved without over-tightening

The first SMA connector is designed for 141 semi-rigid coaxial cables. The original SMA connectors can be called minimal connectors because the center of the coaxial cable forms the center pin of the connection, eliminating the need for a transition between the coaxial center conductor and the special connector center pin.

It has the advantage that the cable dielectric is connected directly to the interface without an air gap, and the disadvantage is that only a limited number of connect/disconnect cycles can be performed. However, for applications using semi-rigid coaxial electrics, this is unlikely to be a problem, as the installation is usually fixed after initial assembly.

II.Performance OF SMA Connectors

SMA connectors are designed to have a constant, 50 ohm impedance on the connector. The SMA connector was originally designed and specified for operation up to 18 GHz, although some versions have a top frequency of 12.4 GHZ and some are specified for 24 or 26.5 GHZ. Higher frequency caps may require operating with higher return loss

In general, SMA connectors have a higher reflection coefficient than other connectors up to 24 GHz. This is due to the difficulty of precisely fixing the dielectric support, but despite this difficulty, some manufacturers have managed to overcome this problem appropriately and are able to specify their connectors for operation at 26.5GHz.

For flexible cables, the frequency limit is usually determined by the cable rather than the connector, because the cables accepted by SMA connectors are small, and their losses are naturally much greater than those of the connector, especially at the frequencies they may be used.

III.Rated Power OF SMA Connectors

In some cases, the power rating of the SMA connector may be important. The key parameter that determines the average power handling capacity of a coaxial connector 9 is its ability to transmit high currents and maintain the heat rise to a moderate temperature.

The heating effect is mainly caused by the contact resistance alone, which is a function of the way the contact surface area and the contact pad are only together. A key area is the center contacts, which must be formed correctly and fit together well. It should also be noted that the average rated power % decreases with frequency because the resistance loss · increases with frequency.

Power processing data for SMA connectors varies widely between manufacturers, but some numbers suggest that some can handle 500 watts at 1GHZ and drop to slightly less than 200 watts at 10 GHz, but this is also measured data and may actually be higher