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help please,it's urgent: double inset feed patch antenna

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bvik

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hello everybody,
i am supposed to design a rectangular microstrip patch antenna for 2GHz and 2.5GHz with inset feed. The patch length should be the resonating length for 2GHz and the width for 2.5 GHz. When i do it for individual frequency it is ok. but whenever i am using two inset feeds(one along length for 2 GHz and the other along width for 2.5 GHz) the frequencies shifts about 0.3-0.5 GHz to the origin. I have got no idea how to implement double inset feed. the project needs to be completed in 1 week. please help.

---------- Post added at 14:02 ---------- Previous post was at 14:00 ----------

one thing i forgot to mention, i am using IE3D from Zealand for simulation.
Please help.
Thank you in advance.
 

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