Pi Attenuator Calculator

This calculator calculates the dimensions of a Pi Attenuator, which is a three-port network used to reduce signal power in RF (Radio Frequency) circuits.

Input Parameters

Calculation Results

Calculation Formula

The Pi Attenuator formula is based on the following equations:

Where:
A = Attenuation (in dB)
Z₀ = Characteristic Impedance (in Ω)
β = Propagation Constant
Y₁, Y₂, Y₃ = Admittances of the resistors

Pi Attenuator Calculator Usage Guide

Learn how to use the Pi Attenuator Calculator and its working principles

How to Use the Calculator

  1. Enter the frequency of the signal in MHz.
  2. Enter the desired power level reduction in dB.
  3. Enter the characteristic impedance of the system in ohms (default is 50Ω for most RF systems).
  4. Click the "Calculate" button to compute the values of the three resistors in the Pi Attenuator.
  5. The results will be displayed in ohms for R₁, R₂, and R₃.

Working Principle

A Pi Attenuator is a three-resistor network designed to reduce the power of a signal without significantly affecting the signal's impedance. It consists of two shunt resistors (R₁ and R₃) and one series resistor (R₂). The values of these resistors are calculated based on the desired attenuation and the system's characteristic impedance.

Applications

Pi Attenuators are commonly used in RF and microwave circuits to reduce signal power for various purposes, such as matching circuits, protecting sensitive components, and calibrating measurement equipment.