The easiest way to create this is with an s-parameter template as show below. This is just a human readable csv file that lists the phase/magnitude(or equivalent representation) of the S11 measurement at every frequency. Once measured you will need to export a ‘touchstone’ s1p file. Try to think if you error is likely to be a significant fraction of a wavelength. As normal the accuracy you need for this is dependent upon the required frequency. If we design a matching network it will be assumed that this is where we place our components. We must be very careful to understand the calibration plane of tour antenna. However I will highlight one critical point. I won’t go into detail here about how to measure an antenna as this was covered in my previous posts. The Device Under Test could really be any device, but as I am an antenna geek, lets assume its an antenna. Qucs intentionally uses its own SPICE incompatible simulation kernel Qucsator. It merges the power of SPICE and the simplicity of the Qucs GUI. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation kernels with the Qucs GUI. Once you get to grips with the basics here, you can always experiment in QUCSstudio with alternate components. Qucs-S was forked from the Qucs cross-platform circuit simulator in 2017. However it is possible to use alternative components such as transformers, transmission lines, or even resistors as part of an matching network. Of course, I had totally forgotten!!! But lets go through it again.Ī matching network is normally a network of inductor or capacitors selected to convert from one impedance to another. I was asked in the comments about exactly to do this. This could be used to quickly design antenna matching networks for instance. So far my pick is QucsStudio for Qucs like simulators and LTspice for Spice like simulators.In my last blog post I alluded to the fact that you could take s1p touchstone files generated by nanoVNAsaver and use this to automatically calculate/simulate a matching network in QUCSstudio. Components models and libraries seems different between Spice and Qucsator engines. For non RF simulations, LTspice is easier to operate and have more parts models when in comparison with Qucs or TINA-TI. microstrip simulation, filters design, Smith charts, etc. Qucs: An introduction to the new simulation and compact device modelling features implemented in release 0.0.19/0.0.19S of the popular GPL circuit simulator. QucsStudio has the best GUI, a good set of video tutorials, and what I like most, it has live Sliders (called Tune), look how awesome this feature is (at minute 3:55)! - All Qucs versions have some nice RF goodies e.g. Just unzip and run bin/qucs.exe with WINE on Linux, or run the start.bat for Windows. QucsStudio (IMO this is the best Qucs) - has the look of QUCS, it is released as a portable version for Windows only, but it works just fine in Linux with Wine and it is all built with GNU components, but compiled for Windows/MinGW only. Besides Qucs-S, ngspice must also be installed. Usually not in the Linux repositories, has to be compiled or installed manually. Qucs-S (Qucs with Spice) - has the look of QUCS, but the simulation engine is based on SPICE, more precise 'ngspice'. QUCS (Quite Universal Circuit Simulator) - is the one usually found in Linux repositories, and the simulation engine is based on Qucsator, it is not based on SPICE 2. They are all simulators for electronic circuits, just like LTspice or TINA-TI, but different.
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