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8498A

Keysight Technologies (Agilent HP)Attenuators, Fixed

The Keysight (Agilent/HP) 8498A (Option 030) is a high-power, fixed coaxial attenuator designed for RF and microwave applications from DC to 18 GHz. Offering 30 dB of attenuation with an accuracy of 1 dB across the entire band, the 8498A is rated for 25 Watts of continuous average power and up to 500 Watts of peak power. It features distinctive "human engineered" cooling fins to keep surface temperatures safe for operators during high-power continuous operation.

MicrowaveRF and MicrowaveSignal Attenuation

Specifications

Physical

ParameterValue
Operating TemperatureUp to 95 °C (power derating applies above 25 °C)
Dimensions (W×H×D)Ø 59.7 mm × 151.4 mm
Weight0.45 kg

RF Performance Specifications

ParameterValue
Frequency RangeDC to 18 GHz
Nominal Attenuation30 dB
Attenuation Accuracy±1.0 dB (DC to 12.4 GHz), ±1.5 dB (12.4 to 18 GHz)
Impedance50 Ω (nominal)
Maximum VSWR (DC to 8 GHz)1.15
Maximum VSWR (8 to 12.4 GHz)1.25
Maximum VSWR (12.4 to 18 GHz)1.30

Power Handling & Thermal Ratings

ParameterValue
Maximum Average Input Power25 W
Maximum Peak Input Power (DC to 5.8 GHz)500 W
Maximum Peak Input Power (5.8 to 18 GHz)125 W
Peak Power Pulse Width5 µs
Peak Power Duty Cycle0.05%
DirectionalityUnidirectional (high-power RF input should be applied to the Type-N male connector)
Cooling SystemConvection-cooled "human engineered" cooling fins

Mechanical & Connector Specifications

ParameterValue
Connector Type - Port 1 (Input)Type-N male
Connector Type - Port 2 (Output)Type-N female

Ordering & Part Number Configuration

ParameterValue
Base Part Number8498A

Performance

ParameterValue
Power Coefficient< 0.001 dB/dB/W
Temperature Coefficient< 0.0001 dB/dB/°C

Operating Conditions

ParameterValue
Power DeratingLinearly derated to 5 W @ 95 °C for temperatures above 25 °C

Technology

Coaxial Passive Attenuator

Applications

RF and microwave high-power signal attenuation, transmitter testing, and instrument protection