Bias Tees and DC blocks are actually specific forms of very low frequency filters. Specifically, a Bias Tee is a diplexer with an extremely low crossover frequency, while a DC block is a high pass filter with a very low cutoff frequency. All Marki Microwave bias tees and DC blocks offer low, flat insertion loss up to high frequencies.

Marki offers two basic designs for surface mount bias tees. The design used only in the BT-0030SM/G, includes a bypass capacitor on the DC input line, making it immune to external disturbances on the bias line, but it also cannot be improved with additional external components. The performance of the BT-0030SM/G does not change with the current load on the DC bias line. The design used in the BT-0014SM/G, BT-0024SM/G, and BT-0034SM/G does not include an internal bypass capacitor directly on the DC blocking line. The low frequency on these bias tees is lower (500 kHz instead of 10 MHz), but is dependent on the bias conditions. It can be extended lower and made more insensitive to current with an external coil (down to 4 kHz). An external bypass capacitor can also be added to make it more immune to bias line disturbances.

All bias tees are constructed using a custom-made, resonance-free conical inductor to achieve extremely broadband performance. These bias tees offer superior performance, reliability, and ease-of-use when compared to cumbersome bias tees employing off-the-shelf conical inductors.

Marki DC blocks use a proprietary coaxial construction to offer extremely high frequency operation with low, flat insertion loss.

Bias-Tees - Surface Mount, Lead-Free - View All

ModelDatasheetPriceStockLowHighInsertion Loss [dB]DC Current [A]DC Port Isolation [dB]DC Voltage [V]S-ParametersSurface Mount Option
BT-0014SMG PDF Download$54.00485500 kHz14 GHz0.50.54030BT-0014SMGY
BT-0024SMG PDF Download$59.00214500 kHz24 GHz10.54030BT-0024SMGY
BT-0030SMG PDF Download$57.0036020 MHz30 GHz10.54030BT-0030SMGY
BT-0034SMG PDF Download$62.00204500 kHz34 GHz10.54030BT-0034SMGY

Bias-Tees - Surface Mount, Leaded - View All

ModelDatasheetPriceStockLowHighInsertion Loss [dB]DC Current [A]DC Port Isolation [dB]DC Voltage [V]S-ParametersSurface Mount Option
BT-0014SM PDF Download$54.00242500 kHz14 GHz0.50.54030BT-0014SMY
BT-0024SM PDF Download$59.0022500 kHz24 GHz10.54030BT-0024SMY
BT-0030SM PDF Download$57.005720 MHz30 GHz1.00.54030BT-0030SMY
BT-0034SM PDF Download$62.00227500 kHz34 GHz1.00.54030BT-0034SMY

Bias-Tees - Connectorized - View All

High Power Bias Tees - View All

DC Blocks - View All

ModelDatasheetPriceStockLowHighInsertion Loss [dB]Rise Time [ps]Group Delay [ps]DC Voltage [V]S-Parameters
DCZ(M-F)29(M-F)29 PDF Download$495.0014 kHz40 GHz0.767516 -
DCZ(M-F)24(M-F)24 PDF Download$610.0064 kHz65 GHz0.767516 -