| 摘要 |
A hyperfrequency filter comprises a series connection of an inlet length of waveguide (1), a plurality n of resonant cavities (3, 4, 5) and an outlet length of waveguide (2). All these units are of rectangular cross-section and they are interconnected by coupling irises (16, 17, 18, 19). Each resonant cavity includes a dielectric tuning screw (13, 14, 15) for adjusting the resonant frequency of the cavity. Each tuning screw is located in the middle of one of the largest faces of its resonant cavity. The longer dimension a of the cross-section of each cavity is longer than the longer dimension of the cross-section of the waveguide lengths so that the optimum width of the coupling irises is substantially at its minimum possible value for a given set of design conditions on the other filter parameters. This has the effect of broadening the range of frequencies over which a given structure can be tuned without detrimental repercussions on the frequency characteristic of the filter.
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