SMA feedthroughs are constructed using a basic coaxial configuration and are perfect for high-frequency signal transmission applications like microwave and radio communications systems.
SMA coaxial feedthroughs excel in high and ultra-high vacuum (HV/UHV) systems due to their low electrical impedance (50Ω) and low noise capacities.
While vacuum feedthrough connectors fulfill various functions in HV/UHV applications, they must first adhere to several key requirements. The connector must be guarded from electromagnetic interference and must be hermetically sealed.
In the construction of the feedthrough, the materials used must be rated for superior performance in extreme temperatures (as low as the cryogenic regime) and vacuum compatibility. The part should also allow for signal transmission at the frequencies required in the system.
What is an SMA Feedthrough?
Also called subminiature version A connectors, SMA feedthroughs were initially created in the 1960s, integrating a minimalistic screw-type interface with a coaxial cable.
With a single thread coupling and low electrical impedance, SMA connectors were the ideal choice for antenna connections because of their inherent compatibility with radiofrequency.
SMA feedthroughs are most effective for signals in the range of DC to around 18 gigahertz (GHz) and are mainly used for signal processing in this bandwidth in HV/UHV applications.
The robust physical construction of SMA feedthroughs empowers their electronic performance, consisting of high durability metal units in either floating or grounded designs.
Read more: Vacuum Applications for SMA Feedthroughs