The DB-A1A25A-18G50V/911-91 from Rosnol is a DC Block with Frequency DC to 18 GHz, Insertion Loss 0.65 dB, Breakdown Voltage 50 V, VSWR 1.25:1, Return Loss 19.08 dB. Tags: Connectorized, Inner DC Block. More details for DB-A1A25A-18G50V/911-91 can be seen below.