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multiple mode resonator help!!!

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kpcheah

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Hi,

I am trying to design a UWB (ultra wideband) filter using multiple mode resonator.

Can anyone tell me how to determine to resonant mode of the (SIR) stepped-impedance resonator? I need to determine the first three resonant modes of the resonator and reallocate it to the lower-end, center, and upper-end of the UWB passband. The passband of the UWB filter is 3.1 GHz to 10.6 GHz

Besides, i also need to determine the coupling degree of the input/output parallel-coupled line.

I really need help urgently please give me some advice and also any related information.

Thanks a lot
 

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