The W1S109-K00S3 from Rosenberger is a Between Series RF Adapter with Contact Resistance 6 mOhms, Frequency DC to 50 GHz, Insertion Loss 1.2 dB, Insulation Resistance 3500 MOhms, Return Loss 12 to 18 dB. More details for W1S109-K00S3 can be seen below.
