| 摘要 |
PROBLEM TO BE SOLVED: To realize miniaturization while maintaining reflection characteristics, passing characteristics and spurious suppression characteristics of a conventional combined waveguide filter. SOLUTION: A first means couples an opening portion of a waffle type waveguide filter with a resonant cavity of a corrugated type waveguide filter with a window structure in which both wide wall surfaces or both narrow wall surfaces have a step difference in face symmetry with respect to a center surface, and the height and length of the window are set at predetermined values by simulation or an experiment. A second means couples another opening portion of the waffle filter in which a boss row of the waffle filter is biased to one of tube axis directions to the closest resonant cavity of the corrugated filter with the same window as the window of the corrugated filter. COPYRIGHT: (C)2008,JPO&INPIT
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