![]() The complex voltage reflection coefficient Γ \Gamma \, is defined as the ratio of the reflected wave to the incident (or forward) wave. It is an integral part of microwave circuit performance visualization, modern computer-aided design (CAD) tools, and RF/microwave test instrumentation. ) The blue circle, centered within the impedance Smith chart, is sometimes called an SWR circle (short for constant standing wave ratio). The Smith chart is a graphical tool for determination of the reflection coefficient and impedance along a transmission line. Constant Conductance Circles We know that we can take any admittance, y, and plot it on the Smith Chart, since y1/z. The Smith chart can be used to simultaneously display multiple parameters including impedances, admittances, reflection coefficients, S n n S_. 2 We will again be dealing with normalized admittances (yL), which will be related to the normalized impedance zL by: 3 In equation 3, Y0 is equal to 1/Z0. It was independently devised by Tōsaku Mizuhashi ( 水橋東作) in 1937, and by Amiel R. The Smith chart (sometimes also called Smith diagram, Mizuhashi chart ( 水橋チャート), Mizuhashi–Smith chart ( 水橋スミスチャート), Volpert–Smith chart ( Диаграмма Вольперта-Смита) or Mizuhashi–Volpert–Smith chart), is a graphical calculator or nomogram designed for electrical and electronics engineers specializing in radio frequency (RF) engineering to assist in solving problems with transmission lines and matching circuits. For the similar term Volpert graph, see Volpert graph (disambiguation). ![]()
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