This model OA545500Z01 is NCA Female Straight to SMA Female Straight. This series NCA Female Straight to SMA Female Straight have the operating frequency of 18 GHz. Adapters that have a male to female or plug to jack configuration are known as connector savers.
Between Series Adapters are the passive components which are used to transfer signals from one coaxial connector interface to another with minimal losses. Between adapters have different connector configurations on either side of the adapter.