Which softwares are commonly used to create lumped element models of microstrip antennas?

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Anshuman Shastri

Agilent Advanced Design System (ADS) is one of the software you can consider. You can export some exact lumped element models or certain outputs from software like CST and others and use them as functional components in ADS.

I have not used others so may not be giving you the best advice on them but Altium designer is also popular nowadays. I hope this is helpful.

Vadym Slyusar

HFSS, Ansys Electromagnetic Suite