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Microlab DC Blocks are used to prevent the flow of direct current and low frequency current surges along the inner and/or the outer conductors of a transmission line, while permitting the unimpeded flow of RF signals. Applications include the blocking of current surges that can occur in subway tunnels and rail systems, at base-station/cell-sites during lightening storms, to route DC to tower mounted amplifiers (TMA’s) or whenever DC isolation is required. Units are available with a DC block on the inner and/or outer conductor, and all units are built with special attention to effects of PIM.
Microlab DC blocks are wideband (from 380 MHz to 2700 MHz) and are characterised by a very low loss (< 0.08 dB). Moreover, high peak voltage (up to 3.5 kV) eliminates need for supplementary over-voltage protector.

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