Dielectric filter, duplexer, and communication device

Patent metadata

Field	Value
Publication number	US-9666922-B2
Application number	US-201414767456-A
Country	US
Kind code	B2
Filing date	Feb 24, 2014
Priority date	Feb 26, 2013
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

There are provided a dielectric filter with excellent electrical characteristics, a duplexer, and a communication device using the dielectric filter. A dielectric filter includes a dielectric block provided with first through holes; inner conductors disposed on inner surfaces of the first through holes; second through holes; a terminal electrode connected to an inner conductor located at on end; a terminal electrode connected to an inner conductor located at the other end; and an outer conductor surrounding the dielectric block, being connected to a reference potential, wherein the first through holes are located on a second main surface side, and the second through holes are located on a first main surface side with respect to the first through holes. A duplexer and a communication device use this dielectric filter.

First claim

The invention claimed is:

1. A dielectric filter, comprising:
a dielectric block having a rectangular parallelepiped shape, being provided with a plurality of first through holes and one or more second through holes;
a plurality of inner conductors disposed on inner surfaces of the first through holes, respectively, including a first inner conductor and a second inner conductor;
a first terminal electrode electrically or electromagnetically connected to the first inner conductor;
a second terminal electrode electrically or electromagnetically connected to the second inner conductor;
an outer conductor disposed to surround the dielectric block, being connected to a reference potential;
one or more first conductors disposed on a first side surface of the dielectric block; and
capacitance-coupling inner conductors which are not adjacent to each other among the inner conductors; wherein:
the first through holes penetrating into the dielectric block in a first direction which is a direction from one of the first side surface and a second side surface of the dielectric block which face each other, toward the other thereof, and being arranged at intervals in a second direction which is a direction from one of a third side surface and a fourth side surface of the dielectric block which face each other, toward the other thereof,
the second through holes penetrating into the dielectric block in the first direction, and being located at a position between adjacent first through holes in the second direction,
the first inner conductor being disposed on an inner surface of a first through hole of the first through holes which is located at one end in the second direction,
the second inner conductor being disposed on an inner surface of a first through hole of the first through holes which is located at the other end in the second direction,
the outer conductor being disposed to be in contact with a first main surface of the dielectric block, and to face a second main surface, the third side surface, and the fourth side surface of the dielectric block at intervals,
the first through holes being located on a second main surface side of the dielectric block, the second through holes being located on a first main surface side with reference to the first through holes, and
the one or more first conductors are disposed on the second main surface side with reference to the inner conductors.

2. The dielectric filter according to claim 1 ,
wherein a volume of a second through hole of the second through holes which is located at a center in the second direction is larger than volumes of second through holes of the second through holes which are located in opposite ends in the second direction.

3. The dielectric filter according to claim 2 ,
wherein volumes of the second through holes gradually increase from the opposite ends toward the center in the second direction.

4. The dielectric filter according to claim 1 ,
wherein a length in a direction from the first main surface toward the second main surface of an end on the first side surface side of the dielectric block is longer than a length in the direction from the first main surface toward the second main surface of the dielectric block except the end on the first side surface side of the dielectric block.

5. A duplexer, comprising at least:
an antenna terminal;
a transmitting terminal;
a receiving terminal;
a transmitting filter connected in series between the antenna terminal and the transmitting terminal; and
a receiving filter connected in series between the antenna terminal and the receiving terminal,
at least one of the transmitting filter and the receiving filter being the dielectric filter according to claim 1 .

6. A duplexer, comprising at least:
an antenna terminal;
a transmitting terminal;
a receiving terminal;
a transmitting filter connected in series between the antenna terminal and the transmitting terminal; and
a receiving filter connected in series between the antenna terminal and the receiving terminal,
one of the transmitting filter and the receiving filter being the dielectric filter according to claim 1 , the first side surface of the dielectric block being disposed to face the other of the transmitting filter and the receiving filter.

7. A duplexer, comprising at least:
an antenna terminal;
a transmitting terminal;
a receiving terminal;
a transmitting filter connected in series between the antenna terminal and the transmitting terminal; and
a receiving filter connected in series between the antenna terminal and the receiving terminal,
the transmitting filter and the receiving filter being the dielectric filter according to claim 1 , the first side surface of the dielectric block of the transmitting filter and the receiving filter facing each other.

8. A communication device, comprising at least:
the duplexer according to claim 5 ;
an antenna connected to the antenna terminal in a direct manner or through another circuit;
a transmitting circuit connected to the transmitting terminal in a direct manner or through another circuit; and
a receiving circuit connected to the receiving terminal in a direct manner or through another circuit.

9. A dielectric filter comprising:
a dielectric block having a rectangular parallelepiped shape, being provided with a plurality of first through holes and one or more second through holes;
a plurality of inner conductors disposed on inner surfaces of the first through holes, respectively, including a first inner conductor and a second inner conductor;
a first terminal electrode electrically or electromagnetically connected to the first inner conductor;
a second terminal electrode electrically or electromagnetically connected to the second inner conductor;
an outer conductor disposed to surround the dielectric block, being connected to a reference potential; and
one or more second conductors disposed on a second side surface of the dielectric block,
the first through holes penetrating into the dielectric block in a first direction which is a direction from one of a first side surface and the second side surface of the dielectric block which face each other, toward the other thereof, and being arranged at intervals in a second direction which is a direction from one of a third side surface and a fourth side surface of the dielectric block which face each other, toward the other thereof,
the second through holes penetrating into the dielectric block in the first direction, and being located at a position between adjacent first through holes in the second direction,
the first inner conductor being disposed on an inner surface of a first through hole of the first through holes which is located at one end in the second direction,
the second inner conductor being disposed on an inner surface of a first through hole of the first through holes which is located at the other end in the second direction,
the outer conductor being disposed to be in contact with a first main surface of the dielectric block, and to face a second main surface, the third side surface, and the fourth side surface of the dielectric block at intervals,
the first through holes being located on a second main surface side of the dielectric block, the second through holes being located on a first main surface side with reference to the first through holes,
a length in a direction from the first main surface toward the second main surface of an end on the first side surface side of the dielectric block being longer than a length in the direction from the first main surface toward the second main surface of the dielectric block except the end on the first side surface side of the dielectric block, and
the one or more secon

Assignees

• Kyocera Corp

Inventors

• Yoshikawa Hiromichi
• Horiuchi Masafumi
• Nakamata Katsuro

Classifications

• H01Q1/50

  Structural association of antennas with earthing switches, lead-in devices or lightning protectors · CPC title

• H03H7/463

  Duplexers · CPC title

• H01P7/04

  Coaxial resonators · CPC title

• H01P1/2136

  using comb or interdigital filters; using cascaded coaxial cavities (H01P1/2131, H01P1/2135 take precedence) · CPC title

• H01P1/2002 Primary

  Dielectric waveguide filters (H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence) · CPC title