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CP antenna with weird 3D radiation pattern

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walkpass

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hello everyone Recently i have been working on a CP antenna with sequentially rotated feeding.I builded a model with HFSS but i just got a werid 3D radiation pattern. The max gain of the antena is towards GND. With the same size of GND in another model with a well designed feeding network the antenna work well. the model without feeding network can be found in the attachment. looking forward to your help . thanks in advance.
 

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  • wuzhao_xxl.rar
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