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Microstrip antenna design for GSM band

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Hi to everyone.
This is my first post on this group.
Can anyone clear the following doubts.

I am designing MSA for GSM 900/1800.
I want to know, how we can calculate feed line dimesion.
....
And simulation result shows negative gain, what it indicates?
How to increase surface current on patch?
...
Thanks and Regards.
 

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