The AA42S-2 from AmpliTech is a WR-42 Waveguide Interface to SMA-female Adapter for frequencies from 17.7 to 22.2 GHz. It has an insertion loss of 0.3 dB and a VSWR of 1.2:1. This adapter has a WR-42 waveguide interface coupled with a precision tolerance UG-597/U square cover flange and a gasket groove. It has Aluminum housing and measures 1.25 inches in length and is ideal for test benches, radar, satellite communication (SATCOM), microwave radio systems, military, space, and communication systems applications.