The Anritsu 22NF50 is a DC to 18 GHz open / short. It is used on the test port of an SWR Autotester or SWR bridge to establish a full reflection reference for accurate SWR measurements.
When the Anritsu 22NF50 is used with scalar network analyzers, the open and short reflections over a swept frequency range can be automatically averaged to enhance measurement accuracy.