Multiple-mode dielectric resonator and method of adjusting characteristic of the resonator

• US 6,278,344 B1
• Filed: 04/17/2000
• Issued: 08/21/2001
• Est. Priority Date: 02/03/1997
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Abe, Shin, Kurisu, Toru
• Primary Examiner(s): Pascal, Robert
• Assistant Examiner(s): Summons, Barbara
• Application Number:
  US09/550,727
• Time in Patent Office: 491 Days
• Field of Search: 333/202, 333/219.1, 333/227, 333/235
• US Class Current: 333/219.1
• CPC Class Codes: H01P 7/105 Multimode resonators

Abstract

A multiple-mode dielectric resonator in which a combined dielectric block formed of a plurality of dielectric elements combined into a crossed shape is used to cause three resonance modes along a plane defined by two of the dielectric elements, and in which the resonant frequency of each mode is determined, or a multiple-mode dielectric resonator in which the degree of coupling between predetermined resonance modes is determined. If first and third resonance modes are two TM110 modes having different lines of symmetry of electric field distributions, and if a second mode is a TM111 mode, dielectric-cut portions are formed in the combined dielectric block, for example, at positions where the electric field distribution of the first resonance mode is concentrated while the electric field distributions of the second and third resonance modes are not concentrated, thereby selectively determining the resonant frequency of the first resonance mode.

Claims

1. A dielectric resonator including a dielectric resonator element having two parts arranged perpendicular to each other and disposed in a cavity so as to form a TM dual-mode dielectric resonator element, the TM dual-mode dielectric resonator element having a TM 110-mode resonant frequency and a TM111-mode resonant frequency, said dielectric resonator having a cut-portion in said dielectric resonator element so that the TM110-mode resonant frequency of the dielectric resonator element is substantially equal to the TM111-mode resonant frequency.

2. A multiple-mode dielectric resonator comprising:

a region surrounded with a conductor; and

a combined dielectric block formed of a plurality of dielectric elements combined into a crossed shape, said combined dielectric block being placed in said region,

wherein one of first to third resonance modes having no concentration or a lower degree of concentration of an electric field distribution in a least one region in comparison with the other two of the first to third resonance modes is set as a resonant frequency setting object,

the first and third resonance modes comprising two pseudo TM110 modes along a plane defined by two of said plurality of dielectric elements, the two pseudo TM110 modes having different lines of symmetry of electric field distributions,

the second resonance mode comprising a pseudo TM111 mode along the same plane, and

wherein the resonant frequency of the resonance mode set as the resonant frequency setting object is determined relative to the resonant frequencies of the other two resonance modes by a dielectric-cut portion formed in a portion of said combined dielectric block corresponding to the region with no concentration or a lower degree of concentration of the electric field distribution, and/or by a dielectric material applied to a portion of said combined dielectric block corresponding to the region with no concentration or a lower degree of concentration of the electric field distribution.