Problem Simulation C-P@tch Antenna with HFSS 9.1

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unine

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I'm trying to simulate a c-p@tch antenna as described in the paper 'The C-P@tch: A Small Microstrip Element by G. Kossiavas, Electronics Letters, 1989, p253-254'. (Frequency: 413MHz)

I draw the antenna in HFSS (see file) but I suppose I do have a problem with my port. Can anybody help me out? My S11 is about -2dB

Thanks a lot
 

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