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Bandstop Filters With Extended Upper Passbands

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promach

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I have a question on Bandstop Filters With Extended Upper Passbands

What does it exactly mean by θ ?

nN63sbP.png
 

But that wikipedia link does not mention about θ ?

Please correct me if I miss anything.
 

As in any well written scientific paper, terms are introduced in the text. θ is electrical length of a line segment, θr electrical length at resonance (center frequency).
 

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