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How to understand the bandwidth of radial stub?

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yuntianbb

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My question is in the attachment. Thanks evryone!
 

flatulent

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You need to compare a radial stub connected directly to the line with a quarter wave with an open other end.
 

yuntianbb

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flatulent said:
You need to compare a radial stub connected directly to the line with a quarter wave with an open other end.

u mean that the larger bandwidth of radial stub is compared with the quarter-wave? If so, it really is! I have done the simulation after your suggestion.
Thans a lot!
 

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