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SMA (Sub-Miniature version A) connectors are semi-precision coaxial RF connectors developed in the 1960s as a minimal connector interface for coaxial cable with a screw-type coupling mechanism. The connector has a 50Ω impedance. SMA is designed for use from DC (0Hz) to 18GHz, and is most commonly used in microwave systems, hand-held radio and mobile telephone antennas, and more recently with WiFi antenna systems and USB software-defined radio dongles.
USING SMA IN SIMULATIONS
For simulating purpose, rfsims assumes the SMA connector uses a polytetrafluoroethylene (PTFE) dielectric as the insulator. The dielectric constant of PTFE is around 2.08.
The diameter of the inner and outer conductors are shown in the figure below. It is noted that all dimensions are in millimeters.