T Attenuator Calculator and Formula

This page provides information about the T attenuator calculator and the formulas used in its calculations.

T Attenuator Calculator

Here’s an example of how to use the T attenuator calculator:

• Impedance: 50 Ohms
• Attenuation: 9 dB

Using these values, the calculated resistor values are:

• R1 = R3: 64.4 Ohms
• R2: 195.43 Ohms

Note: When selecting resistor values, choose the nearest available standard RF chip resistor values.

T Attenuator Formula

Similar to the PI attenuator, the T attenuator is used to introduce attenuation into a signal path. Its layout resembles the letter “T,” hence the name.

The following formula is used in the T attenuator calculator:

Based on the required attenuation (e.g., 3dB, 6dB, or 9dB), different chip resistor values need to be calculated. These resistors are then soldered into the RF circuit path.

The T attenuator is often included in RF circuit designs as a provision for future use due to its simple layout and pad structure. If attenuation is not needed, the gaps in the T attenuator within the main path can be shorted, effectively achieving zero attenuation.