MULTIMODE DIELECTRIC RESONATOR DEVICE, DIELECTRIC FILTER COMPOSITE DIELECTRIC FILTER, AND COMMUNICATION DEVICE

摘要

Two TE modes the electric fields of which rotates on mutually perpendicular planes are coupled independently of the coupling of two TM modes the electric fields of which are oriented in the directions in the same perpendicularity relation of the TE modes. A multimode dielectric resonator device have four modes: TM01δ-x mode, TM01δ-y mode, TE01δ-x mode, and TE01δ-y mode. Protrusion portions (Pe1, Pe2) are provided to upper and lower layer portions (La, Lc) of a dielectric core (1). Therefore, the effective dielectric constant of the portion where the dielectric flux of the even mode of the TE coupling modes passes is made different from that of the portion where the dielectric flux of the odd mode of the TE coupling modes passes. A protrusion portion (Pc) is provided to an intermediate layer portion (Lb) of the dielectric core (1). Therefore, the effective dielectric constant of the portion where the dielectric flux of the even mode the TM coupling modes passes is almost equal to that of the portion where the dielectric flux of the odd mode of the TM coupling modes passes. Thus, while suppressing the coupling between the TM01δ-x mode and the TM01δ-y mode, the coupling of the TE01δ-x mode and TE01δ-y mode is established.