Lifetime Connectivity

DC-BLOCK-3-NMF-1
DC Block

Rev : B | Rev date : 15 Nov 2025
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.

Features / Benefits

• Multi-Band Frequency Range
• 3 kV High Voltage Rating
• Minimal RF Insertion Loss
• Very Low Passive IM
• RoHS Compliant
• High Reliability
• N male/female connector

Structure
Product Type DC Block
Input Connector Type N male
Output Connector Type N female
Electrical Specifications
Impedance 50 Ω
Frequency Range 80 - 3800 MHz
Return Loss (Max VSWR) 15.5 dB (1.4) @ 80 - 100 MHz
17.7 dB (1.3) @ 100 - 300 MHz
26.4 dB (1.1) @ 300 - 1880 MHz
20.8 dB (1.2) @ 1880 - 2700 MHz
19 dB (1.25) @ 2700 - 3800 MHz
Insertion Loss 0.25 dB @ 80 - 3800 MHz
Intermodulation (IM3) 155dBc, typ -160dBc (2x20W)
Max. DC Blocking Voltage 3 kV
Temperature Specifications
Temperature Range -40°C to 55°C (-40°F to 131°F)
Testing and Environmental
Environmental Class IP67 per EN60529