The DCB1SM3 from Microwave Devices Inc. is a DC Block with Frequency 10 MHz to 3 GHz, Insertion Loss 0.35 dB, Breakdown Voltage 200 V, VSWR 1.20:1, Operating Temperature -55 to 125 Degree C. Tags: Connectorized, Inner DC Block. More details for DCB1SM3 can be seen below.