Multiplicative linear power ratios become additive when expressed logarithmically. Therefore, matched path losses can be added in dB.
How it works in practice
Include each cable, pad and accessory using a consistent loss convention. Multiple-reflection effects can cause deviations from a simple nominal sum when matching is imperfect. Use measured complete-path data for precise work. Gains enter the same budget with the opposite sign.
Example and interpretation
A 10 dB pad, 6 dB pad and 1 dB cable loss give 17 dB nominal total loss.
Checks before use
- List all components
- Use frequency-specific values
- Keep signs consistent
- Verify the assembled path
Important limit
Do not count the same baseline loss twice.
Related Centron RF product
SMA 2 W 6 GHz fixed attenuator. Use calculated levels to define a requirement, then compare it with the exact product’s current bandwidth, input power, impedance and available attenuation options. Calculations assume stated conditions and do not replace a component datasheet.
Further reading
Keysight: Fundamentals of RF and Microwave Power Measurements. This background reference explains general principles; the selected Centron RF model’s datasheet governs its own ratings.
Related guides
Educational guide. Numerical examples use the stated assumptions and are not test results for a supplied unit.