A monolithic single block dielectric filter and monolithic single block duplexer dielectric filter for removing higher-order mode harmonic frequency and for improving in band response

摘要

PURPOSE: An integral dielectric filter and an integral duplex dielectric filter are provided to remove a high-order harmonic frequency and improve an in-band feature by forming a coupling electrode at upper and lower surfaces thereat, electrically changing a coupling direction of at least one resonator, and manufacturing a resonator longer than other resonator. CONSTITUTION: At least one resonator are formed at upper and lower surface at an integral dielectric filter by selectively patterning a coupling electrode and a common electrode. Any one of a transmitting terminal electrode and a receiving terminal electrode are selectively formed. The coupling electrode is formed at upper and lower surfaces of a resonator in which a transmitting/receiving terminal electrode is formed. Both sides coaxial resonators(RS,RS) are formed at both sides of a center coaxial resonator(RC). Each length of the both sides coaxial resonators(RS,RS) is longer than that of the center coaxial resonator(RC). Coupling electrodes(CE) are formed at upper surfaces of the coaxial resonators(RS,RC,RS). A lower common electrode is formed at an area of the center coaxial resonator(RC). Coupling electrodes(CE) are formed at the both sides coaxial resonators(RS,RS). An input electrode and an output electrode are selectively formed adjacent to the coupling electrodes(CE). The input electrode and the output electrode are independently formed away from a side common electrode and coupling electrodes(CE) by a predetermined distance.