A waveguide fixed attenuator is a device used to control and reduce signal strength during electromagnetic wave transmission. The following are its characteristics and applications:
Main features:
1. High attenuation accuracy: It can provide accurate attenuation amount to meet the requirements of signal attenuation accuracy in different application scenarios.
2. Good stability: It can maintain stable attenuation performance in various environments and is not easily affected by external factors such as temperature and humidity.
3. Large power capacity: Capable of withstanding high power, suitable for high-power microwave systems.
4. Wide frequency range: The working frequency covers a wide range and can meet the application needs of different frequency bands.
Application area:
1. Communication system: Used to control signal strength, ensure that signals are not too strong or too weak during transmission, and avoid equipment damage or information loss.
2. Radar system: Reduce the strength of radar transmission signals to prevent excessive signals from causing interference or damaging equipment at the receiving end.
3. Microwave system: Used for decoupling matching, level control, and setting reference levels when measuring using high-frequency substitution method.
4. Test measurement: Used in testing equipment to accurately reduce the output level of the signal source and expand the frequency range of the power measurement equipment.
Qualwave Inc. provides a waveguide fixed attenuator with low standing wave and high attenuation flatness from 3.94 to 500 GHz, with an optional attenuation range of 0 to 40 dB. This article mainly introduces a WR-51, 200W waveguide fixed attenuator.

1. Electrical Characteristics
Part Number: QWFA51-K2-40-A-1
Frequency: 14.5~22GHz
VSWR: 1.2 max.
Attenuation: 40dB
Average Power: 200W min.
2. Mechanical Properties
Interface: WR-51 (BJ180)
Flange: FBP180
Material: Aluminium
Finish: Conductive oxidation
Coating: Black paint
3. Environment
Operating Temperature: -40~+125℃
4. Outline Drawings

Unit: mm [in]
Tolerance: ±0.2mm [±0.008in]
The above is a detailed introduction of this product.
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Post time: May-23-2025