This calculator allows you to determine the values of resistors R1 and R2 necessary for the design of a T-bridge attenuator. This configuration is used to obtain precise attenuation while maintaining a constant impedance at the input and output of the circuit.
Formulas
R1(Ω) = Z0(Ω) × [10^(dB/20) − 1]
R2(Ω) = Z0(Ω) / [10^(dB/20) − 1]
Explanation of formulas
The resistances R1 and R2 are calculated according to the desired attenuation (in dB) and the characteristic impedance (Z0). R1 is the series resistance between the source and the load, while R2 is the parallel resistance of the bridge. Together, they reduce the signal while preserving impedance matching, essential for avoiding reflections.
Uses of the calculator
- Design of constant impedance attenuators for RF applications.
- Ideal for laboratory testing and matching networks.
- Allows you to reduce the signal level without mismatching.
- Suitable for balanced and unbalanced RF systems.