US 9,178,482 B2 · Filter element

Abstract

A filter element includes a laminate including insulator layers. A ring conductor pattern is provided on one of the insulator layers. Linear conductor patterns of a first inductor having a helical shape with an axial direction thereof being a laminating direction of the laminate and linear conductor patterns of a second inductor having a helical shape with an axial direction thereof being the laminating direction are provided on predetermined ones of the insulator layers. The ring conductor pattern is arranged such that inner regions of the linear conductor patterns of the first inductor and inner regions of the linear conductor patterns of the second inductor are included in an inner region of the ring conductor pattern.

Drawings

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Drawings

Claims20

Dependent claims

A filter element comprising:

a laminate including a plurality of insulator layers that are laminated on each other, the laminate including a first inductor and a second inductor therein;
wherein
each of the first inductor and the second inductor is defined by loop-shaped conductor patterns provided between common adjacent pairs of the plurality of insulator layers, and by via conductors penetrating through the common adjacent pairs of the plurality of insulator layers and connecting the respective loop-shaped conductor patterns to each other in a laminating direction of the laminate;
each of the first inductor and the second inductor has a helical shape and includes an air space portion with a center axis extending in the laminating direction;
the first inductor and the second inductor are disposed at different positions of the laminate when viewed in the laminating direction;
a ring conductor pattern including an opening is provided on an insulator layer of the plurality of insulator layers different from the insulator layers of the plurality of insulator layers on which the first inductor and the second inductor are provided;
at least a portion of the air space portion of the first inductor and at least a portion of the air space portion of the second inductor are arranged inside the ring conductor pattern when viewed in the laminating direction;
and
the ring conductor pattern defines a ring resonator which is not electrically connected to any input/output terminals, any of the loop-shaped conductor patterns of the first and second inductors, or any other conductor patterns.

6 more elements

A filter element comprising:

a first inductor;
a second inductor;
and
a ring conductor pattern;
wherein
each of the first inductor and the second inductor is defined by loop-shaped conductor patterns;
each of the first inductor and the second inductor has a helical shape and includes an air space portion with a center axis extending through a center of the helical shape, the center axes of the airspace portions of the first and second inductors being parallel or substantially parallel to each other;
the first inductor and the second inductor are spaced apart from each other in a direction perpendicular or substantially perpendicular to a direction in which the center axes of the air space portions of the first and second inductors extend;
a ring conductor pattern including an opening is provided adjacent to the first inductor and the second inductor in the direction in which the center axes of the air space portions of the first and second inductors extend;
at least a portion of the air space portion of the first inductor and at least a portion of the air space portion of the second inductor are arranged inside the ring conductor pattern when viewed in the direction in which the center axes of the air space portions of the first and second inductors extend;
and
the ring conductor pattern defines a ring resonator which is not electrically connected to any input/output terminal, any of the loop-shaped conductor patterns of the first and second inductors, or any other conductor patterns.

9 more elements

Dependencies are inferred from the claim text.

Description7,508 words

Summary1,662 words

#1. Field of the Invention

#The present invention relates to a filter element including an inductor.

#2. Description of the Related Art

Brief description of the drawings9 figures

#FIG. 1 is an equivalent circuit diagram of a filter element according to an example of a preferred embodiment of the present invention.

#FIG. 2 is an exploded perspective view of a laminate defining the filter element according to the first preferred embodiment of the present invention.

#FIGS. 3A and 3B are a seeing-through plan view and a partial side view, respectively, illustrating a positional relationship between a ring conductor pattern and each of linear conductor patterns of a first inductor and linear conductor patterns of a second inductor.

Detailed description5,571 words

#A filter element according to preferred embodiments of the present invention will be described below with reference to the drawings. While the present preferred embodiment is described in connection with a band pass filter as an example, the arrangement of the present preferred embodiment can similarly be applied to any type of filter utilizing a mutual inductance that is obtained with magnetic coupling between plural inductors.

#FIG. 1 is an equivalent circuit diagram of a filter element according to the present preferred embodiment of the present invention.

#The filter element 10 includes a first input/output terminal P1 and a second input/output terminal P2. A capacitor C3 is connected between the first input/output terminal P1 and the second input/output terminal P2. A terminal of the capacitor C3 disposed on the same side as the first input/output terminal P1 is connected to the ground through a first parallel resonator 21. A terminal of the capacitor C3 disposed on the same side as the second input/output terminal P2 is connected to the ground through a second parallel resonator 22. An input/output capacitor Cio is connected between the first parallel resonator on the side connected to the capacitor C3 and the first input/output terminal P1 and between the second parallel resonator 22 on the side connected to the capacitor C3 and the second input/output terminal P2.

Facts

Application

13/848,072Filed 21 Mar 2013

Priority

JP 2012-06648423 Mar 2012

Published

US 2013/0249646 A126 Sep 2013

Granted

3 Nov 2015

Term ends

29 Jan 2034

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 314 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.

Classification4 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 2001/0085
Constructional details: multilayer, e.g. LTCC, HTCC, green sheets
H03H
Impedance networks

Timeline

23 Mar 2012Priority claimedJP 2012-066484
21 Mar 2013Application filedUS 13/848,072
21 Mar 2013Assigned to Murata Manufacturing Co., Ltd.assignment of assignor's interest
26 Sep 2013PublishedUS 2013/0249646 A1
3 Nov 2015GrantedUS 9,178,482 B2
12 Oct 2026TodayWithin its term
29 Jan 2034Term endsEstimated, includes 314 days of adjustment

Filter element

Life of this patent

Filter element

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims20

Description7,508 words

Drawings

Classification4 codes

Life of this patent

Description7,508 words