| 摘要 |
PURPOSE: A dielectric duplexer is provided to achieve improved signal attenuation characteristics at the receiver and transmitter terminals, while improving filter selectivity. CONSTITUTION: A dielectric duplexer comprises a dielectric block(20) having an open surface(22) and an outer surface provided with an outer conductor; a plurality of resonators(R21 to R28) having a plurality of holes penetrating from the open surface to a rear surface(23) of the dielectric block, and inner conductors formed at the inner surface of each hole, wherein resonators operate as band pass filters for transmitter and receiver terminals; input/output electrode sections(P21 to P23) formed from the open surface to an upper surface(21) adjacent to the open surface of the dielectric block, and which perform a signal transmission function between band pass filters; and strip line sections(S21,S22) arranged at the open surface of the dielectric block in such a manner that the strip line sections are connected to the input/output electrode sections and spaced apart from resonators, so as to adjust the position of transmission zero without attenuating signals for resonance period.
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