Filter with dielectric resonators

• US 4,757,289 A
• Filed: 07/16/1986
• Issued: 07/12/1988
• Est. Priority Date: 07/22/1985
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ogawa, Shigeo, Kosugi, Yuhei
• Primary Examiner(s): Nussbaum, Marvin L.
• Application Number:
  US06/886,130
• Time in Patent Office: 727 Days
• Field of Search: 333/202, 333/204, 333/205, 333/208-212, 333/219, 333/227, 333/232, 333/235, 333/245, 333/246, 333/222-224
• US Class Current: 333/209
• CPC Class Codes: H01P 1/2084 with dielectric resonators
• CPC Class Codes: H01P 1/219 Evanescent mode filters

Abstract

A dielectric resonator filter applicable to any desired frequency which is required with a microwave band or a millimeter wave band communication apparatus is disclosed. A single base plate made of metal carries therewith a single or a plurality of dielectric resonators, a pair of input/output coupling members, and a pair of input/output connectors all of which are arranged directly on the base plate in a planar configuration. This base plate subassembly is shielded by a cover having a recess in a sectional view which serves as a cutoff range waveguide.

Claims

1. A dielectric resonator filter comprising:

a single flat base plate at least a surface of which is made of metal;

a plurality of dielectric resonators arranged in an array on said surface made of metal at predetermined intervals;

a pair of input/output coupling members each formed of a bent thin sheet and arranged on said surface made of metal to face those of said dielectric resonators which are located at opposite ends of said array, said input/output coupling members being mounted such that a surface thereof which electromagnetically couples with a dielectric resonator is perpendicular to said flat base plate; and

a cover mounted to said base plate and formed with a channel which constitutes a cutoff waveguide, said dielectric resonators and input/output coupling members being disposed in said channel.

2. A dielectric resonator filter as claimed in claim 1, further comprising a pair of input/output connectors which are respectively connected to said input/output coupling members and mounted on said base plate to be received in said channel.

3. A dielectric resonator filter as claimed in claim 2, wherein each of said dielectric resonators is held by a support member having a small tan δ

value and which is connected to said surface which is made of metal.

4. A dielectric resonator filter as claimed in claim 3, wherein said support member is made of a dielectric material having a small dielectric dissipation factor.

5. A dielectric resonator filter as claimed in claim 1, further comprising screws arranged on said cover and in alignment one with each of said dielectric resonators for adjusting resonant frequency.

6. A dielectric resonator filter as claimed in claim 5, further comprising a pair of input/output connectors which are respectively connected to said input/output coupling members and mounted on said base plate to be received in said channel.

7. A dielectric resonator filter as claimed in claim 6, wherein each of said dielectric resonators is held in a support member having a small tan δ

value and which is connected to said surface which is made of metal.

8. A dielectric resonator as claimed in claim 7, wherein said support member is made of a dielectric material having a small dielectric dissipation factor.

9. A dielectric resonator filter comprising:

a single flat base plate at least a surface of which is made of metal;

a plurality of dielectric resonators arranged in an array on said surface made of metal at predetermined intervals;

a pair of input/output coupling members each formed of a bent thin sheet and arranged on said surface made of metal to face those of said dielectric resonators which are located at opposite ends of said array, said input/output coupling members being mounted such that a surface thereof which electromagnetically couples with the dielectric resonator is perpendicular to said flat base plate; and

a cover mounted to said base plate and formed with a channel which constitutes a cutoff waveguide, said dielectric resonators and input/output coupling members being disposed in said channel;

wherein each of said dielectric resonators is held by a support member having a small tan δ

value and which is connected to said surface which is made of metal.

10. A dielectric resonator filter as claimed in claim 9, wherein said support member is made of a dielectric material having a small dielectric dissipation factor.

11. A dielectric resonator filter as claimed in claim 10, further comprising screws arranged on said cover and in alignment one with each of said dielectric resonators for adjusting resonant frequency.