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microstrip pach antenna

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m.shadi

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Hi
I wanted to design a microstrip rectangular patch antenna in 2.45 GHz.I chose the fellow dimension:

h_sub=10mm
epsilonr=2.2
Lp=34.23
Wp=48.4
L_GND=94.23
W_GND=108.4

I used coaxial cable(50 ohm) for feeding with:
Rin=0.6
Rout=2.3*0.6

the prob was PEC and the coax is vacuume.
But I do not know the position of feed and I sweep for different value of X0 and Y0 for the position of feed but I could not see the good S parameter and I do not have any point that I have match.
can any one help me,what is my problem?plz help me...
I simulated this with HFSS.
 

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