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#USING SMITH CHART UPDATE#

Fleming for telephone lines, but he kept getting numbers that went off the top and bottom of the chart. Smith tried to graph the effects of these reflections on an early type of rectangular chart developed by J. These reflected waves can bounce back and forth along the line and are eventually lost, reducing the amount of power transmitted. However, with many types of antennas, some of the waves are reflected back into the line. Ideally, all the waves would go smoothly along the line in one direction and no reflections would occur. Smith originally designed his chart to solve problems he encountered in transmitting radio waves along a special type of cable called a transmission line that conducts the waves from a radio transmitter to an antenna. The microwave engineer’s objective in many instances is to get as much microwave power as possible through electrical obstacles on its way to the goal of being transmitted from an antenna or being amplified in a receiver. This simplified version of a Smith Chart shows both resistance in ohms (numbers on the horizontal axis that range from 0.2 to 10) and the angle of a quantity called the reflection coefficient, in degrees on the outer edge of the circle. From the beginning of World War II until the development of digital computers for engineering problems, the Smith Chart was the dominant tool for microwave engineers.

To show Mag/Angle for a z data in Data Reader, click More button in the Preferences dialog and choose : Magnitude or : Angle to show them in the Data Reader.The Chart known as the Smith Chart was the work of Philip Smith and Mizuhashi Tosaku, who seem to have developed it independently of each other.

for line plot, the part outside the real and imag of Gamma rectangle （-1 real 1 & -1 imag 1） will be clipped.

for scatter plot, if real or imag part of Gamma is outside of interval, that data point will not be shown.

For complex: Gamma = (z-1)/(z+1), if the real part of z is negative,.

Use Scale In button on the Tools toolbar to zoom in a rectangle area.

From Origin 2019, Smith chart supports zooming in.

The Smith Chart graph is created from the SMITHCHT.OTP template (installed to the Origin program folder). Click the Add button to add a constant SWR circle through the given point. Given the point position specified, select the circle point density and the line color. The data is then re-plotted.Ĭlick this button to reverse the real part axis of the Smith Chart. The Reinterpret Data as Mag / Angle ButtonĬlick this button to treat the active data plot as the Mag / Angle format, and convert the data into R / X format.

(Note: R = real part, X = imaginary part)Ĭlick this button to convert the active data plot into the Mag / Angle format and put the data in the source worksheet.

#USING SMITH CHART UPDATE#

To update the Smith Chart tool with this change, click the Update button on the tool. You can change the active data plot in the Smith Chart from the Data menu or by selecting the data plot icon in the legend. If you have plotted multiple data sets into the Smith Chart, the Convert Data to Mag / Angle and the Reinterpret Data as Mag / Angle buttons act on the active data plot. Click Normalize to perform the normalization. Re-normalize the current Smith Chart by entering or selecting a factor, from the Factor combo box. Additionally, click the button to open the Smith Chart tool. To customize the Smith Chart, edit the Plot Details and Axes dialog boxes. In the opened dialog, click Reinterpret Data as Mag / Angle buttonĬlick the Smith Chart button on the 2D Graphs toolbar.Highlight the X and Y columns and plot a Smith Chart.If what you have is Mag and Angle(in degree) data for and want to plot a Smith chart from them, Requires a selection of at least one Y column of values and an associated X column īy default, the X and Y columns are treated as real part and imaginary part of Zl.