Pc-case 0.5ft Rf Electrical Wire Coaxial Cable Terminal Connector Rp-sma Female Bulkhead Straight to Rp-sma Male Right Angle Assembly Pigtail Extension Rg316 15cm Copper Conductor for Wireless Antenna SMA is designed for use from DC to 18 GHz, but is most commonly used for hand-held radio and mobile telephone antennas, and more recently with WiFi antenna systems and USB software-defined radio dongles[citation needed]. It is also commonly used in radio astronomy, particularly at higher frequencies (5GHz+). SMA connectors can be visually confused with the standard household 75-ohm type F coax connector (diameters: Male 716 inch (11 mm) circular or hex; female 38 in (9.5 mm) external threads), as there is only about a 2 mm difference overall in the specifications. Type F cannot be mated with SMA; this connection is possible using an adapter. The SMA name is also used for a superficially similar optical fiber connector. application for Antennas, Wireless LAN Devices , Coaxial cable, Wi-Fi Radios External Antenna and so on Coaxial cable differs from other shielded cables because the dimensions of the cable are controlled to give a precise, constant conductor spacing, which is needed for it to function efficiently as a transmission line.