抄録
A powerful numerical solution is presented for band-pass filters in rectangular waveguides. The filters are composed of cascading of perfectly conducting inductive obstacles with zero thickness: asymmetrical windows, symmetrical windows, or symmetrical strips. The problem is reduced to a set of singular integral equations, which is solved by an extension of Lewin’s quasi static procedure. After the accuracy of the classical formulae for the equivalent reactance is investigated, the simple inverse formulae are constructed to yield proper window widths for desired equivalent parameters. The effectiveness of them is demonstrated by designing practical filters having maximally flat or equal-ripple characteristics.
