发明授权
US06362705B1 Dielectric filter unit, duplexer, and communication apparatus 有权
介质滤波器单元,双工器和通信设备

Dielectric filter unit, duplexer, and communication apparatus
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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