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Pi Attenuator Calculator

Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator. This can be built into a FLEXI-BOXand a transmission line PCB is available which easily adapts for this circuit with one simple trimming operation. There is also a selection of suitable RF connectors available.

[pi attenuator formula]

1) Enter the system impedance and required attenuation then then press "Calculate" below to obtain the Ideal resistor values.
 
System impedance:   Ohms Ideal series resistor:   Ohms
Required attenuation:   dB Ideal shunt resistor:   Ohms
 

2) Change the calculated resistor values in the amber text boxes below to the nearest Preferred Resistor Values or to those available then press " Calculate" below to get the resulting attenuator parameters.
 
Preferred series resistor:   Ohms Attenuation:   dB
Preferred shunt resistor:   Ohms Input Impedance:   Ohms
Mismatch Losses:  Included Reflection Coefficient: 
VSWR: 
Return Loss:   dB
 

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The calculator uses simple Ohms law calculations, and more comprehensive formulas for Voltage Reflection Coefficient and VSWR which are available at:-

http://www.spectrum-soft.com/news/fall2009/vswr.shtm

Mismatch Losses added on 31/12/2012

This calculator is provided free by Chemandy Electronics in order to promote the FLEXI-BOX

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