US 6,686,813 B2 · Dielectric filter, dielectric duplexer, and communication apparatus

Abstract

A dielectric filter and a dielectric duplexer, which obviate the need to change the design of a circuit board when the dielectric filter or the dielectric duplexer are to be changed and in which the degree of freedom of design is improved, and a communication apparatus using them are constructed. Resonator holes having internal conductor formed on the respective inner surfaces thereof, and excitation holes are provided in a dielectric block, and electrodes and an external conductor are formed on the outer surface of the dielectric block. The positions of input/output coupling electrodes on the mounting surface with respect to the circuit board are aligned with the positions of the input/output coupling electrodes on the circuit board. At least one of the electrodes provided on the opening surfaces of the resonator holes is disposed in a direction which is not perpendicular to the mounting surface.

Drawings

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Drawings

Claims44

Dependent claims

A dielectric filter comprising:

a dielectric block having a plurality of outer surfaces including a front surface and a planar mounting surface extending perpendicular to said front surface, said dielectric block including an excitation hole and a resonator hole, both of which extend from said front surface in a direction parallel to said mounting surface;
an excitation hole conductor formed on an inner surface of said excitation hole;
a resonator hole conductor formed on an inner surface of said resonator hole;
an input/output electrode electrically coupled to said excitation hole internal conductor, said input/output electrode including a connection portion located on said front surface and extending along a straight line which forms an oblique angle with respect to said mounting surface and a contact portion located on mounting surface, said contact portion being offset from said excitation hole as viewed along the plane of said mounting surface;
and
an external conductor, which is insulated from said input/output electrode, formed on a plurality of said outer surfaces.

3 more elements

A dielectric filter, comprising:

a dielectric block having a plurality of outer surfaces including a front surface, a recessed surface which lies parallel to and spaced from said front surface and a planar mounting surface extending perpendicular to said front and recessed surfaces, said dielectric block including an excitation hole which extends from said recessed surface in a direction parallel to said mounting surface;
an excitation hole conductor formed on an inner surface of said excitation hole;
a resonator hole conductor formed on an inner surface of said resonator hole;
an input/output electrode electrically coupled to said excitation hole internal conductor, said input/output electrode including a connection portion located on said recessed surface an extending along a straight line which forms an oblique angle with respect to said mounting surface and a contact portion located on said mounting surface, said contact portion being offset from said excitation hole as viewed along the plane of said mounting surface;
and
an external conductor, which is insulated from said input/output electrode, formed on a plurality of said outer surfaces of said dielectric block.

3 more elements

A dielectric filter, comprising:

a dielectric block having a plurality of outer surfaces including a front surface and a planar mounting surface extending perpendicular to said front surface and a recess formed in said block at the intersection of said front and mounting surfaces, said recess including a recessed surface spaced from and lying parallel to said mounting surface, said dielectric block including a resonator hole and an excitation hole, both of which extend from said front surface in a direction parallel to said mounting surface;
an excitation hole conductor formed on an inner surface of said excitation hole;
a resonator hole conductor formed on an inner surface of said resonator hole;
an input/output electrode electrically coupled to said excitation hole internal conductor, said input/output electrode including a first connection portion located on said front surface extending along a straight line which forms an oblique angle with respect to said mounting surface and a second connection portion located on said recessed surface and contact portion located on said mounting surface, said contact portion being offset from said excitation hole as viewed along the plane of said mounting surface;
and
an external conductor, which is insulated from said input/output electrode, formed on a plurality of said outer surfaces of said dielectric block.

3 more elements

Dependencies are inferred from the claim text.

Description7,476 words

Summary1,717 words

#1. Field of the Invention

#The present invention relates to dielectric filters (including dielectric duplexers) and a communication apparatus using such dielectric filters.

#2. Description of the Related Art

Brief description of the drawings16 figures

#Other features and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings.

#FIGS. 1A and 1B are perspective views of a dielectric filter according to a first embodiment of the present invention;

#FIGS. 2A and 2B are perspective views of a dielectric filter according to a second embodiment of the present invention;

Detailed description5,414 words

#First Embodiment

#The construction of a dielectric filter according to a first embodiment of the present invention will now be described below with reference to FIGS. 1A and 1B.

#FIG. 1A is a perspective view of a dielectric filter in which its mounting surface 20 (the surface of the filter which will be mounted on a circuit board) faces upward. FIG. 1B is a perspective view in which the dielectric filter of FIG. 1A has been rotated 180° within the plane of the sheet on which FIG. 1A is drawn.

Facts

Application

10/013,766Filed 11 Dec 2001

Priority

JP 2000-38597419 Dec 2000

Published

US 2002/0075095 A120 Jun 2002

Granted

3 Feb 2004

Term ended

15 Feb 2022

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 66 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification3 codes

H01P 1/2056
Comb or interdigital filters; Cascaded coaxial cavities: comb filters or interdigital filters with metallised resonator holes in a dielectric block
H01P 1/2136
Combining or separating two or more different frequencies: using comb or interdigital filters; using cascaded coaxial cavities
H01P
Waveguides

Timeline

19 Dec 2000Priority claimedJP 2000-385974
11 Dec 2001Application filedUS 10/013,766
11 Dec 2001Assigned to Murata Manufacturing Co., Ltd.assignment of assignor's interest
20 Jun 2002PublishedUS 2002/0075095 A1
3 Feb 2004GrantedUS 6,686,813 B2
15 Feb 2022Term endedEstimated, includes 66 days of adjustment

Dielectric filter, dielectric duplexer, and communication apparatus

Life of this patent

Dielectric filter, dielectric duplexer, and communication apparatus

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims44

Description7,476 words

Drawings

Classification3 codes

Life of this patent

Description7,476 words