RF Attenuator Pad Resistors
Estimate resistor values for a pi or T attenuator network.
Input parameters
Results
Check resistor power, parasitics, and operating frequency.
Model & assumptions
K = 10^(dB/20). Pi: Rshunt = Z(K + 1)/(K − 1), Rseries = Z(K² − 1)/(2K). T: Rseries(each) = Z(K − 1)/(K + 1), Rshunt = 2ZK/(K² − 1).
Ideal equal-impedance resistive pads. Values are not rounded to preferred series. Total pad power is not the rating for each resistor; verify individual dissipation and RF parasitics.
Sources
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