One can do microwave circuit design with Qucs or Qucs Studio. With some care, Qucs Studio can even do the layout of a distributed filter in KiCAD! LTSpice has a cumbersome notion of transmission lines, but you would not be able to use it to design, say, a hairline filter. Also, through the use of Analog Verilog, they can handle more than just small-signal analysis. The article fails to point out that Qucs and Qucs Studio can also simulate in the frequency domain and also handle □□□□□□□□□□□ elements (using 2❝ electromagnetics analytical models), such as edge-coupled microwave filters and even patch antennas, I think, in the case of Qucs Studio. Spice and its variants are primarily □□□□□□-element, time-domain simulators. Posted in Software Hacks Tagged circuit simulation, free, open source, qucs, qucsstudio, software, SPICE Post navigation There are plenty of other options for those of us running non-Windows operating systems though. Unfortunately there are only Windows versions available, and although some might have some success running it under WINE. Qucs also utilizes SPICE-based simulation, which can model various types of circuit behavior, such as DC, AC, transient, and small-signal analysis. QucsStudio supports a wide range of circuit components and models much in the same fashion as other more popular SPICE programs, including semiconductor devices, passive components, and digital logic gates. (Editor’s note: the author was confused between the GPL open-source Qucs and the closed-source, binary-only QucsStudio. And if you want the GUI option, you might want to try out QucsStudio, which uses Qucs under the hood, and is free to use, but binary-only. That’s the reason for the vast versions of SPICE available now decades after the original was released, not all of which are as open or free as we might like. The original circuit simulation software, called the Simulation Program with Integrated Circuit Emphasis, or SPICE as it is more commonly known, was originally developed at the University of Califorina Berkeley in the 1970s with an open-source license.
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