Withwave’s Broadband DC Block is composed of extremely broadband, coaxial blocking capacitors. It has flat frequency response and low frequency cutoffs as low as 20 kHz.
It isolates the DC components of waveforms while minimizing loss and group delay ripple.
This unit is suitable for high speed & optical communication where test and measurement and high speed data.
If you need more information, please see following datasheet
Broadband DC Block_datasheet