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Waveguide bandstop and notch filters are widely used microwave devices. One of notch filters is in the focus of this paper. It is a stepped conductor in a rectangular waveguide cross-section (inset in Fig. 1). Such a filter provides narrow-band reflection of the TE10 wave at a desired frequency of the operating frequency range. It can be used both as a section of a bandstop filter and as a notch filter...
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