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plz help in the design of combline bandpass filter

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sandeepsreeman

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q1) in combline bandpass filter why the resonator impedance is greater than 50 ohm and in interdigital filter resonator impedance is less than 50 ohm?

q2) what is the length of feedline we have to take while designing combline and interdigital filter and why that length???
why that length cannot be quarter wavelength and half wave length
 

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