| 摘要 |
<p>A variable radio frequency band filter comprising:
a housing (10) with a plurality of cavities (12a, 12b);
a plurality of resonators (16a, 16b), wherein one resonator (16a, 16b) is arranged in each of the cavities (12a, 12b);
a tuning arrangement (28) comprising a plurality of tuning structures (34a, 34b), wherein one of the tuning structures (34a, 34b) is arranged in each of the cavities (12a, 12b) and wherein the tuning structures (34a, 34b) of multiple cavities (12a, 12b) among the plurality of cavities (12a, 12b) are mechanically connected such that the tuning structures (34a, 34b) may be shifted simultaneously in order to simultaneously vary the resonance frequencies of the cavities (12a, 12b) and wherein each tuning structure (34a, 34b) includes at least one first metallic surface (42, 42') facing the resonator (16a, 16b) and at least one second metallic surface (44, 44') facing a wall (24) of the cavity (12a, 12b), the first and second metallic surfaces (42, 42' 44, 44') being conductively connected. It is proposed that the second metallic surface (44, 44') is arranged such that a small and essentially uniform gap (50) is formed between the second metallic surface (44, 44') and the wall in order to achieve a virtual grounding of the metallic surfaces (42, 42', 44, 44').</p> |
