Unfortunately it didnt work again.the same problem.Let me explain briefly how I formed it.
I did a substrate with a rectangular fix and below the substrate, extrude ground with a thickness of 1 or 2 mm.Then open a rectangular small slot in the center of the ground with a 1 mm to 10 mm dimensions.And did a feed line.Below the feed line again another substrate.Boundries are open except the feed substrate (ground).And symmetry planes are "None". For me it all stands true but simulator does not agree with me.And i should add that I use waveguide port with free coordinates.
Thanks for your interest...