Tee Attenuator Calculator

A Tee attenuator is a resistor network used in RF and audio circuits to reduce signal strength by a precise amount while keeping the signal path impedance matched. Enter your required attenuation (in dB) and characteristic impedance into the Tee Attenuator Calculator to get the exact resistor values for your circuit. The primary output is the Series Resistor (R1), with secondary outputs for Shunt Resistor (R2), input impedance, and output impedance.

dB

Required attenuation in decibels

Ω

Transmission line impedance to match

Results

Series Resistor (R1)

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Shunt Resistor (R2)

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Input Impedance

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Output Impedance

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Frequently Asked Questions

What is a T-pad attenuator?

A T-pad attenuator is a three-resistor network that reduces signal amplitude while maintaining impedance matching between input and output ports in RF circuits.

How do I choose the attenuation value?

Select attenuation based on your signal level requirements. Common values range from 3dB to 20dB, with higher values providing more signal reduction.

What impedance should I use?

Use 50Ω for most RF applications, 75Ω for video/cable TV systems, or match your specific transmission line impedance requirement.

What tolerance resistors should I use?

Use 1% or better tolerance resistors for accurate attenuation and good impedance matching, especially in precision RF applications.

How does impedance matching work in T-attenuators?

The resistor values are calculated to present the correct impedance at both input and output ports while providing the desired attenuation level.

What is the minimum attenuation possible?

Minimum attenuation depends on the impedance mismatch ratio. For matched impedances (input = output), very low attenuation is possible with proper resistor selection.

Can I use this for audio applications?

Yes, T-attenuators work for audio frequencies too. Common audio impedances are 50Ω, 75Ω, 600Ω, or other specific values depending on your equipment.

What power rating do the resistors need?

Calculate power dissipation based on your signal levels. The series resistor (R1) typically handles more power than the shunt resistor (R2).