Based on a straightforward coaxial configuration, SMA feedthroughs are ideal for high-frequency transmission applications, such as radio communications and microwave systems. Their low noise capacities and low electrical impedance (50 Ω) make them highly effective in high and ultra-high vacuum (HV/UHV) processes.
Vacuum feedthrough connectors perform a range of functions in HV/UHV applications, but they must first satisfy some fundamental requirements. The connector must be hermetically sealed and shielded from peripheral electromagnetic interference. Materials used in the feedthrough’s construction must be rated for vacuum compatibility and high-performance in severe temperatures (ranging down to the cryogenic regime). Finally, the component must enable signal transmission at process-specific frequencies.
Image Credit: Allectra Limited
Allectra develops and supplies SMA feedthroughs that surpass these essential criteria. The company’s high vacuum coaxial feedthroughs are the preferred solution for high-frequency signal processes in HV/UHV environments.
What is an SMA Feedthrough?
Originally developed in the 1960s, SMA feedthroughs, also referred to as SubMiniature version A connectors, integrate a coaxial cable with a minimalistic screw-type interface. Their low electrical impedance and single-thread coupling make them well-suited for antenna connections due to their inherent radiofrequency compatibility.
SMA feedthroughs deliver reliable performance for signals ranging from DC to around 18 gigahertz (GHz) and are primarily used in HV/UHV applications for signal processing within this bandwidth. Their electronic performance is enhanced by their robust physical design, which consists of high-durability metal components available in grounded and floating configurations.
SMA Feedthroughs from Allectra
At Allectra, we offer a range of SMA coaxial feedthroughs for high-frequency signal transmission in vacuum conditions. Our primary product lines are the 242-SMA 50, 242-SMA-D18G, and the 242-SMAD27G with a wide range of configurations available to suit specific end-user objectives.
Starting with the 242-SMA 50, this range of miniature coaxial connectors offers true 50 Ω impedance with frequency ratings from DC to 6.5 GHz. They are available in single- and double-sided variations, with either grounded or floating shield configurations with up to four male connectors mounted onto a single flange as standard. The 242-SMADF50-C40, for instance, is a double-sided, floating shield connector for up to 6.5 GHz. The 242-SMA D18G C40-4, meanwhile, has four double-sided high-frequency SMA connectors on a single flange each rated to 18GHz. Finally, the new 242-SMAD27G harnesses SuperSMA technology to offer a staggering 27GHz frequency with lowest signal damping.
The advantage of double-sided connectors is in-vacuum the feedthrough can be connected directly to a standard Allectra in-vacuum cable from the 380-SMA range.
Thanks to Allectra’s advanced manufacturing capabilities it is also possible to increase the number of SMA connectors on one flange or combine them for instance with Allectra’s range of Sub-D feedthroughs.
This information has been sourced, reviewed and adapted from materials provided by Allectra Limited.
For more information on this source, please visit Allectra Limited.