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DC Block

This DC Block is used to prevent the flow of direct current and low frequency current surges along the inner and outer conductors of a transmission line, while permitting the unimpeded flow of RF signals. Applications include the blocking of current surges in subway tunnels. The unit consists of a length of coaxial line with a series capacitor in both the center conductor and outer conductor to block the flow of low frequencies, while passing RF with negligible loss or reflections.


• Broadband frequency range from 80 to 3800MHz
• 3 kV High voltage rating
• Inner and Outer conductor separated
• PIM optimized design to minimize network interferences
• Minimal RF insertion loss
• 4.3-10 male/female connector

Technical features

General Specifications

Product TypeDC Block
Techn. ApplicationIndoor
Number of Input Ports1
Number of Output Ports1

Electrical Specifications

Frequency Range MHz80 - 3800
Impedance Ohm50
Insertion Loss dB0.25 @80 - 3800 MHz
Max. VSWR / Return Loss, dBVSWR/dB1.40/15.5 @80 - 100 MHz
1.30/17.7 @100 - 300 MHz
1.10/26.4 @300 - 1880 MHz
1.20/20.8 @1880 - 2700 MHz
1.25/19 @2700 - 3800 MHz
Intermodulation (IM3)160dBc, typ -165dBc (2x20W)
Max. DC Blocking Voltage, KVkV3

Mechanical Specifications

Input Connector Type4.3-10 male
Output Connector Type4.3-10 female
Weight kg (lb)0.3 (0.66)

Temperature Specifications

Temperature Range °C (°F)-40 to 55 (-40 to 131)

Testing and Environmental

Environmental ClassIP67 per EN60529

External Document Links


  1. RF CW Power, max: 1500W @ 80MHz, 300W @1880MHz, 250W @ 2700MHz, 130W @3800MHz ((for VSWR=1,0 at sea level, ambient temperature 40°C)
  2. Blocking DC voltage for VSWR=1,0 at sea level, ambient temperature 20°C