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==Variations==
[[File:SMA-family-male-female.jpg|thumb|Picture of SMA (left), 3.5 mm (center) and 2.92 mm (right) coaxial connectors. Top: male versions, bottom: female versions. The
The SMA connector is typically rated for mode-free operation from DC to 18 GHz, though some proprietary versions are rated to 26.5 GHz.<ref>{{Cite web|url=https://www.amphenolrf.com/downloads/dl/file/id/7684/product/8655/high_frequency_sma_connectors_cut_sheet.pdf|title=Amphenol HF SMA range|website=Amphenol RF}}</ref> For performance above this, other SMA-like connectors are used. These include the 3.5 mm connector, rated to 34 GHz, and the 2.92 mm (also known as 2.9 mm, K type, or SMK),<ref>{{cite web|url=http://www.nutrition-edu.com/ee/terms/C.html#cable_connector |title=Terms - C |date=2011-12-23 |access-date=2014-06-02 |url-status=dead |archive-url=https://web.archive.org/web/20120730052301/http://www.nutrition-edu.com/ee/terms/C.html |archive-date=July 30, 2012 }}</ref> good up to 46 GHz. These connectors keep the same outside thread as the SMA, so they can potentially be cross-mated, but the precision connector can be easily damaged when mating with low-grade SMA connectors.<ref>{{cite web|url=http://fairviewmicrowave.com/sma_2_92_3_5_2_4_compatibility.htm |title=Mating Rules for SMA, 2.92mm, 2.4mm, & 3.5mm connectors |date=2013-08-05 |access-date=2014-07-31 |url-status=dead |archive-url=https://web.archive.org/web/20130806065501/http://fairviewmicrowave.com/sma_2_92_3_5_2_4_compatibility.htm |archive-date=August 6, 2013 }}</ref> The precision versions use an air dielectric with appropriately scaled center conductors.
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