Patent ID: 6362705
Filing Date: 2002-03-26
Classification: H01P

Abstract:
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 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 small-sectional area portion of the resonator hole of the second filter, wherein the inner conductor has a nonconductive portion in the vicinity of one open end portion of the resonator hole.