What are the advantages of MA type RF coaxial connectors?

The origin of MA type RF coaxial connector SMA (SubminiatureA) type RF coaxial connector is Bendix enterprise and Omni-Spectra enterprise in the late 1950s for OSM connector design program, is then one of the common RF / microwave heating connector. At the beginning, SMA connector was designed for 0.141″ semi-rigid coaxial cable, and it was used in the defense industry as a high-precision connector for microwave heating, and it was filled with PTFE material. Under the standard at that time, SMA connector was popularized rapidly because of its small size and its ability to work at a high frequency (the frequency range of the semi-rigid coaxial cable is DC ~ 18GHz; DC ~ 12.4gHz when it is connected to a flexible cable). Even the centimeter wave connector (e.g. 3.5mm, 2.92mm) that developed after the trend also takes into account the problem of adapting mechanical equipment between the two.SMA Connector Characteristics and Structural CharacteristicsThe SMA Connector is a connector with an outer conductor inner diameter of 4.13mm, a characteristic impedance of 50Ω, and a coupling organization of imperial threads (imperial threads of 1/4-36UNS-2A, threads of 1/4-36UNS-2B). SMA connectors are generally equipped with a hexagonal coupling nut of 7.85mm to 8mm, and according to the available conditions, there are three security holes with a diameter of 0.41mm evenly distributed on the coupling nut, which are used to cross a security wire with a diameter of 0.38mm to enhance the reliability of the application of SMA connectors. Apply alloy products with good compressive strength and ductility (e.g. beryllium copper alloy) to manufacture, and carry out moderate heat treatment process.The wall of the outer conductor of the SMA pin-insert connector is too thin, and should be applied to manufacture alloy products with good compressive strength (e.g. beryllium copper alloy, stainless steel plate). Selection of poor compressive strength of the metal products, torque is very large, it is likely that the outer conductor will collapse and ineffective condition.

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