Threaded - the SMA connector is coupled via a screwing mechanism with 36 threads per inch on each connector.Semi-precision - the SMA connector is designed and manufactured in line with its specification to an accuracy of 1/64th of an inch.The male connector has a diameter of 7⁄16 inch (11 mm), and the female's diameter is 3⁄8 in (9.5 mm). Sub-miniature - a smaller radio frequency connector class designed to perform in small spaces.It was developed in the 1960s by the Bendix Scintilla and Omni Spectra Corporations, both US-based engineering companies. The letters SMA stand for sub-miniature version A and describes the SMA connector dimensions and caliber of this connector according to its original US Military (MIL) SMA connector specifications, outlined in MIL-C-39012.
In this case, the type or class of antenna and its applications can vary widely but the consistent feature is the SMA connector used in the antenna. A single SMA connector may be installed on an antenna, or additional auxiliary SMA connectors may be present, to support antenna diversity as we discuss further on. This widely used and hard-wearing connector is the primary point of connection for the antenna and may even have to provide mechanical and structural support as part of an antenna's design. They are designed to connect by soldering or crimping to semi-rigid coaxial cable. These antennas are capable of intercepting electromagnetic energy and translating it into electrical current and vice versa. An SMA connector serves as the primary channel through which radio frequency signals can flow between the antenna and the device it is attached to. SMA antennas are a diverse group of radio frequency antennas that possess an SMA connector for attachment to a coaxial extension cable or other radio frequency hardware. Visually it is similar to the common household 75 Ohm Type F connector that screws into cable boxes, the design varies by 2mm and the two cables cannot b connected without an adapter SubMiniature Version A (SMA) is an RF coaxial connector designed for semi-precision applications. The SMA connector is one of several RF connector designs to connect coaxial cables and antennas while preserving the signal. RF coax cables cannot be stripped and soldered together without signal loss. Both connectors are insulated with polytetratluoroethylene (PTFE) dialectric.Īn antenna with an SMA connector couples to an SMA cable: RF coaxial antenna cable shielded to prevent signal degradation. The female connector has a central receptacle for the pin, also coated with nickel or gold, the threads external to the outer casing.
The barrel screws on to an SMA female antenna or coax with threading spaced at 36 threads per inch. The male connector features a central pin coated with nickel or gold.
They are also cost-effective when designed in gold-plated brass, nickel-plated brass, or stainless steel. SMA connectors have a relatively durable screw coupling (good for 500 couplings at recommended torque) and are resistance to vibration. SMA antenna and coax connectors feature 50 Ohm impedance, drawing DC from 0GHz up to 18GHz. A 433MHz antenna is also likely to be an SMA antenna. SMA was the connector of choice for most applications until RP-SMA began to replace SMA in the late 1990s, as the more popular option, Therefore there are far more RP-SMA antenna options than SMA antenna options: We have many SMA to RP_SMA antenna cable and adapter options that enable you to connect an RP-SMA antenna to an SMA cable or connector.ĭata Alliance offers SMA antennas for WiFi, LTE, GSM, CDMA, Bluetooth, base stations, radio astronomy, hand-held radios or telephones, machine-to-machine communications.
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