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Re: Antenna simulation result different from experiment with NanoVNA

 

sonnet works superb and is quite easy to use ;-)

see picture (circular polarized patch ... a square with truncated corners)

dg9bfc sigi

many thanks for making that list of the free eda soft ... maybe i will try one or two of them (BESIDES SONNET)


Am 01.09.2022 um 16:42 schrieb Jim Lux:

On 9/1/22 6:21 AM, Gary W9TD wrote:
EZNEC is now free.

EZNEC as a Method of Moments code that is derived from NEC is really a "wire" modeling code and doesn't do patches very well.

One can "grid" a patch, and put it over ground with soil properties set to match the substrate, but it doesn't have a way to do the ground plane on the other side of the substrate. (well, in NEC4 you could bury a grid of wires)).

NEC based codes will not do the matching sections or transmission line.


What the OP needs is a low cost tool that is designed for microstrip patches.

Ancient, but maybe PUFF (an early microwave circuit modeling package) would work?

At work we use HFSS, but that's sort of the antithesis of free.

I'd start with the list here:



Sonnet has a student version






dualband_patch_circular2.jpg

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