Spectral properties of a broken-symmetry two-ridged rectangular waveguide section
DOI:
https://doi.org/10.1109/ICATT.2013.6650819Keywords:
bandpass filter, elliptic filter, natural oscillation, transmission zero, trapped mode, waveguide filterAbstract
Influence of a symmetry breaking in a two-ridged rectangular waveguide section on its frequency response is numerically investigated. Section is formed by two rectangular inserts arranged near each other in a cross section of a rectangular waveguide. It is found that a symmetry breaking results in generation of additional attenuation pole at the section frequency response. A pole generation mechanism is studied within the concept of the spectral theory of open waveguide resonators. It is interpreted as a result of excitation of a number of natural oscillations of the complex frequencies. Possibilities to pro-vide a filtering function with both a lower-frequency and a higher-frequency attenuation poles are shown.References
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