SMA connector: description, purpose, classification of the device
SMA connector was developed in 1960 forsemi-rigid cable type RG-402 (0.141 inches). These connectors are designed for resistance of 50 ohms and a frequency of up to 18 GHz (individual precision versions are capable of operating at frequencies up to 26.5 GHz). The SMA connector has a 1 / 4-36 threaded connection, mechanical durability and compact dimensions. The maximum operating frequency for cable connectors depends on the type of wire.
The high-frequency SMA connector has a very wideThe area of application, the key parameters of which are the dimensions and the boundary frequency. In phased array radars, instrumentation, instrument landing systems, and other devices that use phase matching, such connectors for coaxial semirigid cables, as well as special adapters (plug connectors), are a simple precision phase control means.
SMA connector, manufactured in accordance withthe requirements of the standard, is compatible with all connectors (regardless of the manufacturer) that meet this specification and have the same diameter. They are used in many microwave devices: microstrip and coaxial-wave transitions, attenuators, amplifiers, master generators, switches, mixers and filters.
Types of connectors
There are two types of SMA connectors: SMA ("socket" and "plug") and RP-SMA (also "socket" and "plug").
In wireless devices (Wi-Fi access point,WiMAX device, adapter), there is a connector to which the antenna is connected (SMA or N-Type connector). Since this connection consists of two parts, all connectors with a threaded mechanism are of two types, paired to each other: sockets and plugs. That is, the latter is screwed into the nest. The term "mother", "jack" or "female" is used to designate the outlet, and "daddy", "plug" or "male" for the plug.
There are various adapters and adapter cables between different types of connectors.
The second type of connectors are the RP-SMA connectors (withreverse polarity or inverse). In such connectors, the opposite is true: the plug has a socket contact, but the socket is a fork. In the inverted connectors, the configuration in the central output is changed.
Classification of connectors
By the method of connection, the connectorsare divided into devices with threaded and bayonet connection. By the method of installation, the connectors are screwed, soldered and crimped. According to the design, there are instrumental, cable, high frequency connectors mounted on the printed circuit board, as well as adapters.
Instrument devices are fixed to the housing whenusing a square flange or nut. The cable is installed by soldering or crimping. Connectors mounted on the board are attached by soldering vertically or horizontally to the surface. The cable connectors are fixed by crimping or soldering. Adapters are used to connect different types of connectors.
In computer technology, SMA connectors have found widethe use of Wi-Fi antennas in the organization of antennas. They provide very reliable contact, and also minimize the losses occurring at the junction points. The main characteristics of such connectors are durability and resistance to mechanical stresses.