This calculator determines the two resistor values necessary in a reflection attenuator network. It is used in RF systems to achieve specific attenuation while maintaining perfect impedance matching.
Formulas
R1(Ω) < Zo = Zo × [ (10^(dB/20) − 1) / (10^(dB/20) + 1) ]
R1(Ω) > Zo = Zo × [ (10^(dB/20) + 1) / (10^(dB/20) − 1) ]
Explanation of formulas
These equations make it possible to calculate the values of the symmetrical resistances of a reflection attenuator. The first case (R1 < Zo) corresponds to a resistance lower than the characteristic impedance, and the second (R1 > Zo) to a higher resistance. Using the logarithm (10^(dB/20)) directly relates the desired attenuation in decibels to the variation in network impedance.
Uses of the calculator
- Design of RF attenuators with impedance matching.
- Precise control of signal reduction during tests or measurements.
- Calibration and balancing of RF channels.
- Training and study of symmetrical attenuation networks.