Smith Charts 3.0.1 - App Store

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About Smith Charts

A great experience of the Smith chart. Also in dark mode. Design matching networks, insert S parameters and convert them, or import from touchstone file. Compute stability circles, equi gain and noise circles. Easy...

A great experience of the Smith chart. Also in dark mode. Design matching networks, insert S parameters and convert them, or import from touchstone file. Compute stability circles, equi gain and noise circles. Easy interaction with the Smith chart. This chart can easily replace a physical one, making its use much faster. Smith chart interactivity: - Works on iPhone, iPad and Mac (on Apple Silicon). - Drag and zoom in the chart. - Create multiple Smith Charts and name them. - Switch easily between input and output planes. - Use a ruler and drag it to obtain the wavelength toward generator of a point on the chart, instantly. - Tap the chart to show the coordinates in algebraic notation, you will see also magnitude and phase of that location, and the corresponding impedance. - Insert circles by hand; modify the radius dragging a circle to keep the center in place, or press to translate them and modify the radius keeping the opposite side in place. Then use the padlock button to disable interaction of gestures with circles. - You can also insert a custom circle and a segment in the input and in the output plane, defining its center and radius in a textfield. - Export to file, image or PDF Advanced tools for engineering: Matching networks: - Choose electronic components to design a matching network for your device. - Available components are: L, C, R, Z and lines (transmission line, parallel or series stub, open or shorted). - For each component it is possible to specify the parasites. - For transmission lines, it is possible to choose between Z0, K or L, C representations, and converting between the two (also for parasites). - Tapping on a component it is added to the network and the impedance seen from your device toward the matching network is shown on the smith chart. - You can create a matching network both for input and output planes of the device. - Each network has its own termination (source or load), which can be a one port device or a two ports device where you can choose a termination for the second port. - Each termination can be defined by network parameters (S, Z, Y or h) and the parameters can be imported from a touchstone file. - Components supported: Resistor, Capacitor, Inductor, General impedance (R+jX), Transmission line, Parallel stub, series Stub (both shorted or open). - Each component can be cascaded in series or in parallel, no limits of components. - You can choose a frequency for the impedance calculation and a frequency span for the plot on the Smith Chart. - For S parameters, you can specify a dedicated characteristic impedance, the tool will renormalize the Γ of that termination to be correctly shown on the Smith chart, when the smith chart is defined on a different characteristic impedance. Device analysis: - You can insert the following parameters of a device: network parameters (S, Z, Y or h), specifications (Ga, Gp, Gt, NF), noise data (gamma s optimum noise, minimum NF, rn) and the input/output reflection coefficients. - You can convert network parameters (S, Z, Y, h), and the port type (Γ, Z, Y). - While you are inserting data, you will see the computed results appearing on the chart and on the relative fields. - Results representable on the smith chart: input/output stability circles, power gain and noise circles (equiGa, Gp, Gt, NF circles), reflection coefficients towards load and source and optimum power coefficients. - Other results: obtained power gains and noise (Ga, Gp, Gt, NF) and stability (D, K, kind of stability). - You can display on the Smith chart the input impedance of your component versus frequency (as a function of load impedance) when importing a touchstone file. - For S parameters, you can specify a different characteristic impedance and the tool will automatically convert it to the one defined for the Smith chart, it will let you know the new renormalized parameters.

Version History A complete redesign of the app, with tons of new features! - Matching networks design: choose among many components and see on the chart the obtained impedance - Use sliders to see how the impedance changes varying the properties of the components - Network parameters conversions (S, Z, Y, h) - Termination conversions (Γ, Z, Y) - Touchstone compatibility (one / two ports) - Export to file, image or PDF (3.0.1 bug fixes) 3.0.1 03/31/2025 A complete redesign of the app, with tons of new features! - Matching networks design: choose among many components and see on the chart the obtained impedance - Use sliders to see how the impedance changes varying the properties of the components - Network parameters conversions (S, Z, Y, h) - Termination conversions (Γ, Z, Y) - Touchstone compatibility (one / two ports) - Export to file, image or PDF 3.0 03/26/2025 iPadOS 16 compatibility 2.7.1 10/24/2022 - New handle to resize SideView - Space optimisation for all devices * Bug fixes 2.7 10/14/2022 Preparation for iPadOS 16 Stage Manager. - bug fixes and improvements for all devices. 2.6 10/12/2022 The chart image has been improved to be rendered at best resolution for different scalings and device screen sizes. Now the lines of the chart are fixed. 2.5 10/02/2022 Improvements 2.4 08/06/2022 Added a useful example of using Smith charts, available in the bottom of the Charts list into the info sheet. 2.3.1 07/03/2022 *Improvements 2.3 07/02/2022 Added a useful example on how to use this app for a matching network design with microstrip lines. You can find it in the info tab on the bottom of the Charts list. Added also a link to an online Microstrip Calculator. *Improvements. 2.2 07/01/2022 Improved renaming action and added possibility to insert more text in the name of the charts. *Bug fixes 2.1 04/27/2022 Insert circles by hand! Like a compass. Now it's possible to unlock the full potential of the Smith chart, with the new button for circle insertion, as many circles as you want can be inserted in the chart, and no parameters are required for positioning them: with the finger drag the circle to change its radius keeping the center in place (like a compass), or press the circle to translate its position, or change the radius keeping in place the opposite side of the circle using the little squares that appears after pressing. With handmade circles, ruler and point reader this chart can easily replace a physical one, making its use far more faster. *Bug fixes 2.0 04/04/2022 Ruler! Now you can activate and move a ruler through the chart and obtain instantly the electrical length of a point as a ratio of the wavelength. It is possible to disable the ruler in the settings. 1.1 03/15/2022 1.0 12/29/2021

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Previous Versions

Here you can find the changelog of Smith Charts since it was posted on our website on 2023-06-27 23:57:45. The latest version is 3.0.1 and it was updated on 2026-06-23 09:40:40. See below the changes in each version.

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