The Smith chart is commonly used to impedance match RF devices, such as amplifiers, antennas and transceiver devices. The chart is used during RF simulation and is displayed by vector network analysers when taking measurements of RF circuitry.
Professional software to perform linear simulations based on S parameters is available from a number of vendors. Telestrian uses and recommends Microwave Office™ from Applied Wave Research.
This page allows users to try using the Smith chart without installing any software. Try changing the value in the load box (then press the calculate button) to see the location of the impedance on the chart. Then change one of the elements and see the network impedance change.
The Red cursor shows the load impedance. Not visible? It's under the Green cursor!
The Green cursor shows the network input impedance.