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How to avoid rejection in s21 of planar uwb filter

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ANZI

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Recently I am dealing with designing of an ultra wide band filter using CST. An interdigital coupler and a stepped impedance resonator is used to realize the structure. But it always shows a rejection at 9.2GHz in S21 plot when the structure is tuned to 3.1 and 10.6 GHz. can anyone explain me why it is so and how to avoid this.
Thank You.
 

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