The Smith chart is a graphical aid for solving transmission line problems. It was created in 1939 by Phillip H. Smith while working at Bell Labs. In this day of personal computers, spreadsheets and smartphones, a graphical solution may seem quaint but the Smith chart is still an essential tool for radio-design engineers. In fact, it is an integral part of computer-aided design (CAD) software and the radio-frequency network analyzer. Perhaps most importantly, thinking in terms of the Smith ...

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