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-BOX, and 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 Preferred Resistor Values to those available then press " Calculate" below to get the resulting attenuator parameters.
 
Preferred value of series resistor:   Ohms Attenuation:     dB
Preferred value of shunt resistor:   Ohms Input Impedance:   Ohms
Reflection Coefficient:
VSWR:
Return Loss: dB
 

This calculator uses Visual Basic and will work in Internet Explorer and other browsers with Visual Basic plug-ins. For more information see About our calculators. A further Pi Attenuator Calculator is available in JavaScript.

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

http://www.kathrein-scala.com/tech_bulletins/EngRef.pdf

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

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Copyright © 2008 CHEMANDY ELECTRONICS
Last modified: March 25, 2008