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How can I explain the Vivaldi antenna operation?

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emhasan21

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Can anyone help me to understand how this Vivaldi antenna works?

1. For the feed line, I can see a microstrip line that ends with an open-circuited radial stub! But how does it help to match the impedance?

2. In the top plate, why the cavity added there, how the total operation is actually happened?

Can anyone help me to understand the theory in easy way?


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