Tool Introduction

The T matching circuit is so named because the circuit topology resembles the letter "T". This tool helps you create a matching circuit for optimal power transfer between unmatched loads. This technique is not suitable for broadband requirements, but it is a simple way to achieve this at a specific frequency. This calculator will provide you with the circuit topology as well as the component values.

T Match Circuit Description

There are some important items to understand when using this tool. The circuit topology can change depending on the inputs. For example in some topologies there may be 2 inductors and one capacitor and in a different configuration it may be 2 capacitors and one inductor. There is one menu item to select if there is to be any DC current or not, that also affects the topology. The inputs ask for source resistance and source reactance.

The outputs of this tool give you the component values as well as a graph of the impedance looking into the circuit from the source. This allows you to double check the calculator and make sure that it selected appropriate values, by making sure the impedance correctly matches the input impedance. Also remember that the circuit input reactance will be opposite in polarity with the source reactance when matching.