Simulation and measurement results are different. What can be the reason?

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Malcolm White

The frequency is 0.5% too high. This is a very small error. I am surprised it is that close. The match is still good at 5.9 GHz. Go with it!

Actually, in your simulation, the real resonance is probably around 5.885 GHz. The lowest return loss is between two of your samples.

Hüseyin Akman

I wrote an answer but I think there was a internet connection faiure.

In fact I changed relative permittivity to see the result change and I forgot to rechange to 4.4. I realised so soon :( Sorry for that.

It hasn't change despite all the things I have. It works on 5.8 GHz. What can I do?