发明授权
- 专利标题: Dielectric filter unit, duplexer, and communication apparatus
- 专利标题(中): 介质滤波器单元,双工器和通信设备
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申请号: US09407497申请日: 1999-09-28
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公开(公告)号: US06362705B1公开(公告)日: 2002-03-26
- 发明人: Katsuhito Kuroda , Jinsei Ishihara , Hideyuki Kato
- 申请人: Katsuhito Kuroda , Jinsei Ishihara , Hideyuki Kato
- 优先权: JP10-273507 19980928
- 主分类号: H01P120
- IPC分类号: H01P120
摘要:
There provided a dielectric filter unit comprising: a dielectric block having a pair of opposing end surfaces; a plurality of resonator holes respectively passing through the pair of opposing end surfaces of the dielectric block and having a large-sectional area portion and a small-sectional area portion connected to the large-sectional area portion; an inner conductor disposed on the inner surface of each of the resonator holes; an outer conductor disposed on the outer surface of the dielectric block; at least one of the resonator holes constituting a first filter; at least one of the remaining resonator holes constituting a second filter; and the area ratio of the large-sectional area portion to the diameter of the small-sectional area portion of the resonator hole of the first filter being different from the area ratio of the large-sectional area portion to the diameter of the small-sectional area portion of the resonator hole of the second filter. In the above dielectric filter, the center frequency of each filter can be adjusted without altering the length in the axial direction of resonator holes, of the dielectric block of each filter.
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