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[MOVED]Annular ring patch antenna optimization

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cdbwb

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I want to design an annular ring patch antenna for UWB application (3.1 - 10.6 GHz). Now i am facing a problem. I can't find how to optimize width of the annular ring. Everywhere I got all they are taking outer radius/ inner radius = 2. I want to optimize this width to get a broad band characteristic. Please tell me the necessary equation for calculating this width.
 

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