any help for s-parameter of Coaxial patch antenna + CST

[Benj-amin]

Hi everybody!
i designed a patch antenna with coaxial feed by CST, but after simulation, i get a strange results for s-parameter, and gain is about -200 dB and more.
can somebody tell me what is wrong with my CST design.
f =1.9 GHz , L =22 mm, W=31 mm, dielectric constant 11.9 , h=1.5 mm.

 

[K&amp#305z&amp#305]

S11 is obviously 0 dB. There might occur some computational error caused by computer (Not yours, in general). If you attach the gain plot, someone can comment on result.

 

[reidintransit]

check ports, mesh, plot fields to see if there's something setup wrong.

 

[tareq514]

can anyone explain how to set mesh ?