DC bias passing attenuator – 50 MHz to 3 GHz, N connectors: BM10056 series | Bracke Manufacturing

The Bracke Manufacturing coaxial DC bias passing attenuators combine a defined level of RF attenuation with the ability to pass DC voltage through the coaxial connection. The product family operates over a frequency range of 0.05 to 3 GHz and includes fixed attenuation values of 3, 6, 10 and 20 dB.

The attenuators feature a 50-ohm impedance and an inline coaxial configuration with N male and N female connectors. They support a maximum DC voltage of 100 V and a maximum DC current of 2 A.

With a maximum VSWR of 1.35:1 up to 3 GHz, these components are intended for RF systems in which a defined signal level must be established without interrupting the DC supply to a downstream active device.

Advantages

• RF attenuation and DC pass-through combined in one compact coaxial component
• Broad frequency range from 50 MHz to 3 GHz
• Four fixed attenuation values: 3, 6, 10 and 20 dB
• 50-ohm impedance for standard RF test and communication systems
• N male-to-N female configuration for direct inline integration
• Maximum VSWR of 1.35:1
• DC pass-through capability up to 100 V and 2 A
• Rugged passivated stainless-steel body
• Gold-plated contacts and PTFE insulator
• Operating temperature range from −55 to +85 °C
• RoHS-compliant construction according to the manufacturer drawing
• Technical support from EMCO for product selection and integration into RF and microwave systems

Key features

• Function: fixed coaxial DC bias passing attenuator
• Frequency range: 0.05 to 3 GHz
• Impedance: 50 ohms
• Attenuation values: 3 dB, 6 dB, 10 dB or 20 dB
• Attenuation accuracy: ±2.00 dB
• VSWR: 1.35:1 maximum
• RF input power: 2 W
• Maximum DC voltage: 100 V
• Maximum DC current: 2 A
• Connector configuration: N male to N female
• Body material: passivated stainless steel
• Contacts: gold plated
• Insulator: PTFE
• Operating temperature: −55 to +85 °C
• Compliance: RoHS compliant according to the manufacturer

Typical applications

• Signal-level adjustment in RF test and measurement setups
• RF signal attenuation while maintaining DC power to a downstream device
• Powering active antennas, low-noise amplifiers or other bias-powered RF components
• Integration into bias-tee-based measurement and communication systems
• Testing and characterisation of receivers and RF assemblies
• Laboratory, development and production test stations
• Communication, telemetry and RF transmission systems operating up to 3 GHz
• Inline integration between RF generators, amplifiers, receivers and test instruments

Additional information

The required attenuation value of 3, 6, 10 or 20 dB is the main selection criterion for the appropriate version. The frequency range, VSWR, RF input power, DC voltage, DC current and operating temperature are identical for all variants listed in the provided document.

According to the drawings, the 3, 6 and 10 dB models have an overall length of approximately 1.758 inches. The 20 dB version has an overall length of approximately 2.280 inches. Additional mechanical dimensions must be taken from the corresponding manufacturer drawing.

EMCO supports users with the selection of the appropriate attenuation value, verification of DC operating limits and integration into RF and microwave test systems. The individual commercial model references for the four attenuation variants are not clearly specified in the provided information.