This calculator computes the resistor values (R1 and R2) required to design a Bridged Tee Attenuator for a given impedance and attenuation level. It’s useful when designing attenuators that maintain a consistent impedance across input and output.
Formulas
R1(Ω) = Z0 × [10^(dB/20) – 1]
R2(Ω) = Z0 / [10^(dB/20) – 1]
Formula Explanation
- R1 is the series resistor between the source and load.
- R2 is the shunt resistor forming the bridge path.
- Z0 is the system impedance, and dB is the target attenuation.
Example
Input: Attenuation = 100 dB, Z0 = 0.2 Ω
Result: R1 = 19999.8 Ω, R2 = 0 Ω
Who uses it
Ideal for RF engineers and lab designers who need accurate impedance-matched attenuation networks for testing and circuit design.