US 9,178,484 B2 · Filter

Abstract

In a filter, LC parallel resonators are arranged along an x-axis direction of a multilayer body and include coils and capacitors, respectively. LC parallel resonators adjacent to each other in the x-axis direction are electromagnetically coupled to each other. Each of the coils includes line conductor layers disposed on an insulating layer, a first via-hole conductor that extends from the line conductor layers to a negative direction of a z-axis direction and that is electrically connected to one conductor layer of the corresponding one of the capacitors, and a second via-hole conductor that extends from the line conductor layers to the negative side of the z-axis direction and that is electrically connected to the other conductor layer of the capacitor. A coupling conductor layer provides a capacitance between two line conductor layers which are adjacent to each other in the x-axis direction.

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Drawings

Claims16

Dependent claims

A filter comprising:

a multilayer body including a plurality of insulating layers stacked on each other in a stacking direction;
a plurality of LC parallel resonators that are arranged along a first direction which is perpendicular or substantially perpendicular to the stacking direction and that each of the plurality of LC parallel resonators includes a coil and a capacitor including a plurality of conductor layers;
and
at least one coupling conductor layer disposed on one of the plurality of insulating layers;
wherein
LC parallel resonators of the plurality of LC parallel resonators which are adjacent to each other in the first direction are electromagnetically coupled to each other;
each coil of the plurality of LC parallel resonators includes:
a line conductor layers disposed on one of the plurality of insulating layers,
a first via-hole conductor that extends from the line conductor layer to one side of the stacking direction and that is electrically connected to one of the plurality of conductor layers of the corresponding capacitor, and
a second via-hole conductor that extends from the line conductor layer to the one side of the stacking direction and that is electrically connected to another one of the plurality of conductor layers of the corresponding capacitor;
the at least one coupling conductor layer provides a capacitance between two of the line conductor layers which are adjacent to each other in the first direction;
at least one of the LC parallel resonators which are adjacent to each other in the first direction includes a plurality of the line conductor layers;
and
the at least one coupling conductor layer is disposed between the plurality of line conductor layers in the stacking direction.

11 more elements

A multilayer bandpass filter comprising:

a multilayer body including a plurality of insulating layers stacked on each other in a stacking direction;
a plurality of LC parallel resonators that are arranged along a first direction which is perpendicular or substantially perpendicular to the stacking direction and that each of the plurality of LC parallel resonators includes a coil and a capacitor including a plurality of conductor layers;
and
at least one coupling conductor layer disposed on one of the plurality of insulating layers;
wherein
LC parallel resonators of the plurality of LC parallel resonators which are adjacent to each other in the first direction are electromagnetically coupled to each other;
each coil of the plurality of LC parallel resonators includes:
a line conductor layers disposed on one of the plurality of insulating layers,
a first via-hole conductor that extends from the line conductor layer to one side of the stacking direction and that is electrically connected to one of the plurality of conductor layers of the corresponding capacitor, and
a second via-hole conductor that extends from the line conductor layer to the one side of the stacking direction and that is electrically connected to another one of the plurality of conductor layers of the corresponding capacitor;
the at least one coupling conductor layer provides a capacitance between two of the line conductor layers which are adjacent to each other in the first direction;
at least one of the LC parallel resonators which are adjacent to each other in the first direction includes a plurality of the line conductor layers;
and
the at least one coupling conductor layer is disposed between the plurality of line conductor layers in the stacking direction.

11 more elements

Dependencies are inferred from the claim text.

Description9,557 words

Summary1,129 words

#1. Field of the Invention

#The present invention relates to a filter, and more particularly, to a filter including a plurality of LC parallel resonators.

#2. Description of the Related Art

Brief description of the drawings14 figures

#FIG. 1 is an external perspective view of a filter according to a preferred embodiment of the present invention.

#FIG. 2 is an exploded perspective view of a multilayer body of a filter.

#FIG. 3 is an equivalent circuit diagram of a filter.

Detailed description8,163 words

#Filters according to preferred embodiments of the present invention will be described below.

#The configurations of filters according to preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a filter 10 according to a preferred embodiment of the present invention. FIG. 2 is an exploded perspective view of a multilayer body 12 of the filter 10. FIG. 3 is an equivalent circuit diagram of the filter 10. In FIGS. 1 and 2, a z-axis direction is a direction in which insulating layers 16 are stacked on each other, an x-axis direction is a direction along the long sides of the filter 10, and y-axis direction is a direction along the short sides of the filter 10. The x-axis direction, y-axis direction, and z-axis direction are perpendicular or substantially perpendicular to each other.

#The filter 10 preferably includes, as shown in FIGS. 1 and 2, the multilayer body 12, outer electrodes 14a through 14c, LC parallel resonators LC1 through LC3, capacitors C4 and C5, and via-hole conductors b6, b7, b14 through b19, b26, and b27.

Facts

Application

14/644,321Filed 11 Mar 2015 · continuation

Priority

JP 2012-20601619 Sep 2012

Published

US 2015/0188508 A12 Jul 2015

Granted

3 Nov 2015

Term ends

6 Jun 2033

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term 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.

Classification5 codes

H03H 7/0115
Frequency selective two-port networks: comprising only inductors and capacitors
H03H 7/09
Frequency selective two-port networks: filters comprising mutual inductance
H03H 7/1775
Comprising typical LC combinations, irrespective of presence and location of additional resistors: parallel LC in shunt or branch path
H03H 2001/0085
Constructional details: multilayer, e.g. LTCC, HTCC, green sheets

Timeline

19 Sep 2012Priority claimedJP 2012-206016
11 Mar 2015Application filedUS 14/644,321
11 Mar 2015Assigned to Murata Manufacturing Co., Ltd.assignment of assignor's interest
2 Jul 2015PublishedUS 2015/0188508 A1
3 Nov 2015GrantedUS 9,178,484 B2
12 Oct 2026TodayWithin its term
6 Jun 2033Term endsEstimated

Filter

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Filter

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Abstract

Drawings

Drawings

Claims16

Description9,557 words

Drawings

Classification5 codes

Life of this patent

Description9,557 words