Active solid-state devices (e.g. – transistors – solid-state diode – With means to control surface effects – Insulating coating
Reexamination Certificate
2001-08-30
2003-02-18
Helms, David (Department: 2818)
Active solid-state devices (e.g., transistors, solid-state diode
With means to control surface effects
Insulating coating
C361S303000, C361S306100, C361S306300, C361S312000, C361S821000
Reexamination Certificate
active
06521976
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to multilayer LC composite components, and more particularly, the present invention relates to multilayer LC composite components used in mobile communication apparatuses such as mobile phones and methods for adjusting the frequency characteristics of the multilayer LC composite components.
2. Description of the Related Art
A conventional multilayer LC composite component defining a multilayer LC filter is shown in
FIG. 5. A
multilayer LC composite component
1
in
FIG. 5
includes ceramic sheets
2
to
9
having inductor via-holes
10
a
,
10
b
,
11
a
,
11
b
,
12
a
, and
12
b
formed therein, capacitor patterns
13
to
15
, resonant capacitor patterns
16
a
,
16
b
,
17
a
,
17
b
,
18
a
, and
18
b
, coupling capacitor patterns
19
to
21
, ground-side capacitor patterns
22
to
24
, ground patterns
25
and
26
, input and output lead patterns
27
and
28
disposed thereon.
The ceramic sheets
2
to
9
are stacked and a protecting ceramic sheet is disposed on the top and bottom of the stacked sheets. Then, the entire group of stacked sheets is integrally burned to constitute a multilayered body
50
shown in FIG.
6
. An input terminal
51
, an output terminal
52
, and ground terminals G
1
and G
2
are disposed on the multilayered body
50
. The input terminal
51
is connected to the input and output lead pattern
27
, and the output terminal
52
is connected to the input and output lead pattern
28
. The ground terminals G
1
and G
2
are connected to the ground patterns
25
and
26
and the ground-side capacitor patterns
22
to
24
.
In the LC filter
1
having the above-described structure, the inductor via-holes
10
a
,
10
b
,
11
a
,
11
b
,
12
a
, and
12
b
are connected in the direction in which the ceramic sheets
2
to
9
are stacked to constitute pillar inductors L
1
, L
2
, and L
3
having lengths d
1
. The resonant capacitor patterns
16
a
,
16
b
,
17
a
,
17
b
,
18
a
, and
18
b
are opposed to the ground pattern
25
and the ground-side capacitor patterns
22
to
24
via the ceramic sheets
2
to
4
to define resonant capacitors C
1
, C
2
, and C
3
. The capacitor patterns
13
to
15
are opposed to the coupling capacitor patterns
19
to
21
to define coupling capacitors Cs
1
, Cs
2
, and Cs
3
. In addition, connecting via-holes
41
a
to
41
d
,
42
a
to
42
d
, and
43
a
to
43
d
, are arranged to electrically connect the resonant capacitor patterns
16
a
,
16
b
,
17
a
,
17
b
,
18
a
, and
18
b
to the inductors L
1
, L
2
, and L
3
.
FIG. 7
is an electrically equivalent circuit diagram of the LC filter
1
constituted by the above-described arrangement. The pillar inductor L
1
and the resonant capacitor C
1
define an LC resonator Q
1
, the pillar inductor L
2
and the resonant capacitor C
2
define an LC resonator Q
2
, and the pillar inductor L
3
and the resonant capacitor C
3
define an LC resonator Q
3
. The LC resonators Q
1
to Q
3
are electrically connected to each other via the coupling capacitors Cs
1
to Cs
3
to constitute a three-stage band pass filter. Furthermore, mutual inductances M generated between the pillar inductors L
1
to L
3
and the coupling capacitors Cs
1
to Cs
3
define parallel traps to provide an attenuation pole at a frequency higher than the central frequency.
On the other hand, in the LC filter
1
having the above-described structure, one end of each of the inductors L
1
to L
3
is electrically connected to each of the capacitor patterns
13
to
15
to define the open-circuited end of each of the resonators Q
1
to Q
3
. The other ends of the inductors L
1
to L
3
are electrically connected to the ground pattern
26
to define the short-circuited ends of the resonators Q
1
to Q
3
. In addition, the input and output lead patterns
27
and
28
are always led from one end of each of the pillar inductors L
1
and L
3
, that is, from the open-circuited ends of the resonators Q
1
and Q
3
. As a result, in such a conventional LC filter, an attenuation pole that is formed at a frequency higher than the central frequency cannot be moved freely. Thus, the attenuation pole cannot be set near the central frequency.
SUMMARY OF THE INVENTION
In order to overcome the problems described above, preferred embodiments of the present invention provide a multilayer LC composite component that is arranged to allow for free and easy setting of an attenuation pole formed at a frequency higher than the central frequency. Also, preferred embodiments of the present invention provide a method for adjusting the frequency characteristics of the multilayer LC composite component.
According to a first preferred embodiment of the present invention, a multilayer composite component includes a plurality of insulation layers that are stacked to define a multilayered body, a plurality of inductors including via-holes connected in the direction in which the insulation layers are stacked, a plurality of capacitors including capacitor patterns, the inductors and the capacitors being arranged in the multilayered body to define a plurality of LC resonators, and one end of each of the inductors being electrically connected to the capacitor patterns of each of the capacitors defining the LC resonators, a ground pattern arranged one of the insulation layers to be electrically connected to the other ends of the inductors, and an input lead pattern and an output lead pattern arranged on one of the insulation layers to be electrically connected to midpoints of the inductors in the direction in which the insulation layers are stacked.
According to a second preferred embodiment of the present invention, a multilayer LC composite component includes a plurality of insulation layers including at least first to fifth layers arranged to define a multilayered body, a plurality of inductors and a plurality of capacitors disposed in the multilayered body to define a plurality of LC resonators, ground-side capacitor patterns arranged on the first insulation layer, hot-side capacitor patterns arranged on the second insulation layer to define the capacitors of the LC resonators, the hot-side capacitor patterns being opposed to the ground-side capacitor patterns, input and output lead patterns arranged on the third insulation layer, first inductor-via-holes formed in the third insulation layer and connected to the input and output lead patterns, second inductor-via-holes formed in the fourth insulation layer, and a ground pattern arranged on the fifth insulation layer, wherein the first to fifth insulation layers are stacked and then the first and second inductor via-holes are connected in the direction in which the insulation layers are stacked to define the inductors, one end of each inductor being electrically connected to the hot-side capacitor patterns of each of the capacitors defining the LC resonators and the other ends of the inductors being electrically connected to the ground pattern arranged on the fifth insulation layer, and the input and output lead patterns arranged on the third insulation layer being electrically connected to midpoints of the inductors in the direction in which the insulation layers are stacked.
In addition, preferably, a distance between the ground pattern and each of positions connecting the input and output lead patterns to the inductors is within a range of between about 200 &mgr;m and about 700 &mgr;m in the direction in which the insulation layers are stacked. With this arrangement, desired input and output impedances such as approximately 50&OHgr;, 70&OHgr;, and 75&OHgr; Q can be obtained.
According to a third preferred embodiment of the present invention, a method for adjusting the frequency characteristics of a multilayer LC composite component in which insulation layers are stacked to define a multilayered body inside which a plurality of inductors and a plurality of capacitors are disposed to constitute a plurality of LC resonators, includes the steps of forming the plurality of inductors by forming via-holes c
Helms David
Keating & Bennett LLP
Tran Mai-Huong
LandOfFree
Multilayer LC composite component does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multilayer LC composite component, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multilayer LC composite component will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3153872