JPH09186050A - Lc resonance component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resonance component which is excellent in attenuation characteristics and sprious characteristics on the high frequency side. SOLUTION: A laminated LC filter 1 consists of an insulating sheet 2 provided with a ground electrode 3 and a viahole 8, an insulating sheet 2 provided with a viahole 9, an insulating sheet 2 provided with a capacitor electrode 4 and a viahole 10, an insulating sheet 2 provided with a capacitor electrode 5 and a viahole 11, insulating sheets 2 provided with the respective capacitor electrodes 6, 7, a surface insulating sheet 2, etc. The viaholes 8-11 link and form an inductor conductor 12. From the viewpoint of electric equivalent circuit, the inductor conductor 12 is divided by a capacitor electrode 4, and forms an inductor conductor 12a constituted by the viaholes 8, 9, and an inductor conductor 12b constituted by the viahole 10, 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LC resonance component, and more particularly to an LC resonance component incorporated and used in high frequency electronic equipment such as a mobile phone.

[0002]

2. Description of the Related Art As shown in FIG.
It is known that in the LC resonance component 81 including the LC parallel resonance circuit configured by 1 and the capacitance C21, a pole may be formed on the high frequency side in order to improve the attenuation characteristic on the high frequency side. Specifically, an LC resonance component 85 including an LC series resonance circuit composed of an inductance L22 and a capacitance C22 is separately prepared,
If the LC resonance component 85 and the LC resonance component 81 are connected in parallel via the connecting conductors 87 and 88, a pole is formed on the high frequency side. Alternatively, like the LC resonance component 91 shown in FIG. 15, the inductance L23 and the capacitance C2 are
Even if the inductance L24 is inserted in series on the ground side of the LC parallel resonance circuit configured by 3, the pole is formed on the high frequency side.

[0003]

However, even if the poles are formed by combining the conventional parts or the poles are formed by inserting the inductance in the ground side of the LC resonance circuit, the spurious characteristics on the high frequency side are not improved. There was a problem of getting worse. Therefore, it is an object of the present invention to provide an LC resonance component having excellent attenuation characteristics and excellent spurious characteristics on the high frequency side.

[0004]

In order to achieve the above object, an LC resonant component according to the present invention has a damping characteristic in which a pole is formed on the high frequency side of a resonance frequency and a spurious response on the high frequency side is improved. It is characterized in that the resonance circuit and the parallel resonance circuit are built in one chip. Further, in the LC resonance component according to the present invention, one of the inductor conductors divided by the capacitor electrode constitutes the inductance of the series resonance circuit, and the other inductor conductor constitutes the inductance of the parallel resonance circuit. Is characterized by.

Further, in the LC resonance component according to the present invention, at least one of the inductor conductors forming the series resonance circuit or the parallel resonance circuit forms the series resonance circuit and the parallel resonance circuit. It is characterized in that it is arranged perpendicularly to the capacitor electrode.

[0006]

With the above configuration, by incorporating a series resonance circuit and a parallel resonance circuit in one chip, and combining the series resonance circuit and the parallel resonance circuit in parallel between the input / output electrode and the ground electrode, In the attenuation characteristic, a pole is formed on the high frequency side of the resonance frequency, and spurious on the high frequency side is improved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an LC resonant component according to the present invention will be described below with reference to the accompanying drawings. [First Embodiment, FIGS. 1 to 5] As shown in FIG. 1, a laminated LC filter 1 is an insulation in which a ground electrode 3 is provided on a surface and a via hole 8 connected to the ground electrode 3 is provided in a central portion. Body sheet 2, an insulator sheet 2 having a via hole 9 in the center, an insulator sheet 2 having a capacitor electrode 4 on the surface and a via hole 10 connected to the capacitor electrode 4 in the center, and a capacitor electrode Insulator sheet 2 provided with 5 on the surface and a via hole 11 not connected to this capacitor electrode 5 in the central portion
And an insulator sheet 2 provided with capacitor electrodes 6 and 7 on the surface, and an insulator sheet 2 on the surface.

The insulating sheet 2 is a sheet-shaped product obtained by kneading dielectric powder and magnetic powder together with a binder and the like. Each of the electrodes 3 to 7 is made of Ag, Pd, Cu, Au, A
It is made of g-Pd or the like and is formed by a means such as printing.
The via holes 8 to 11 are made of Ag, Pd, Cu, Au,
It is formed by filling a hole provided in the insulator sheet 2 in advance with a conductive paste such as Ag-Pd.

The end 3a of the ground electrode 3 is exposed on the left side of the sheet 2. The end 4a of the capacitor electrode 4 is exposed on the right side of the sheet 2. The end 5a of the capacitor electrode 5 is exposed on the left side of the sheet 2, and a circular (or square) gap 5b is formed in the center.
And is separated from the via hole 11 by a predetermined dimension. The capacitor electrode 6 is provided on the surface of the sheet, leaving the outer peripheral edge of the sheet 2. The end 7a of the capacitor electrode 7 is exposed on the left side of the sheet 2.

The via holes 8-11 are connected to form the inductor conductor 12. The lower end surface 11a of the via hole 11 is directly connected to the central portion of the capacitor electrode 6. The via hole 9 is elongated in the axial direction. In the first embodiment, the via hole 9 is arranged so that the axial direction of the via hole 9 is parallel to the sheet thickness direction.
Are formed on the sheet 2. However, the method of forming the via hole 9 is not limited to this, and for example, a via hole may be formed in a thin sheet, and a plurality of thin sheets may be laminated to connect the via holes formed in each sheet.

The inductor conductor 12 is divided by the capacitor electrode 4 in terms of an electrical equivalent circuit, and is made into an inductor conductor 12a having an inductance L1 and an inductor conductor 12b having an inductance L2. The inductor conductor 12a is composed of the via holes 8 and 9, and the inductor conductor 12b is composed of the via holes 10 and 11.

The sheets 2 having the above-mentioned structure are stacked and then integrally sintered to form a laminated body. next,
As shown in FIGS. 2 and 3, a ground external electrode 15 and an input / output external electrode 16 are formed on the left and right side surfaces of the laminated body, respectively. The external electrodes 15 and 16 are formed by means such as coating baking, sputtering, or vapor deposition. The end portion 3a of the ground electrode 3 and the end portions 5a, 7a of the capacitor electrodes 5, 7 are connected to the ground external electrode 15, and the end portion 4a of the capacitor electrode 4 is connected to the input / output external electrode 16. .

The LC thus obtained, as shown in FIG.
In the filter 1, the inductance L1 of the inductor conductor 12a formed by the via holes 8 and 9 and the capacitance C1 generated between the capacitor electrodes 4 and 5 are combined to form an LC parallel resonance circuit. The inductance L2 of the configured inductor conductor 12b and the capacitance C2 generated between the capacitor electrodes 6, 5, and 7 are combined to form an LC series resonance circuit. The LC parallel resonance circuit and the LC series resonance circuit are composed of the input / output external electrode 16 and the ground external electrode 1.
5 are connected in parallel relationship. Therefore, this LC
The filter 1 incorporates an LC parallel resonance circuit and an LC series resonance circuit in one chip, and its attenuation characteristic has a pole formed at a position A on the higher frequency side than the resonance frequency f _{0 as} shown in FIG. And, the spurious on the high frequency side is improved. For comparison, FIG. 5 also shows the attenuation characteristics of a conventional LC filter in which a component having an LC parallel resonance circuit and a component having an LC series resonance circuit are combined (see the chain line 19).

When a current flows through the inductor conductors 12a and 12b, a magnetic flux φ is generated around the inductor conductors 12a and 12b so as to circulate perpendicularly to the axial direction of the inductor conductors 12a and 12b. However, since the inductor conductors 12a and 12b and the capacitor electrodes 4 to 7 are vertically arranged, the magnetic flux φ is reduced to the capacitor electrodes 4 to 7.
And no eddy current is generated in the capacitor electrodes 4 to 7. As a result, the LC filter 1 having a small eddy current loss and a high Q can be obtained. In addition, the inductor conductors 12a and 12b
Since the capacitor electrodes 4 and 6 are directly connected in the laminated body without the connection conductor, the influence of the inductance component of the connection conductor itself can be suppressed, and the shield resistance and radiation performance are improved. The filter has good spurious characteristics.

Furthermore, since the inductor conductors 12a and 12b are connected to the central portions of the capacitor electrodes 4 and 6, the influence of the inductance component of the capacitor electrodes 4 and 6 themselves can be minimized, and further, The spurious characteristics of can be improved.

[Second Embodiment, FIGS. 6 to 8] As shown in FIG. 6, the laminated LC filter 21 includes a ground electrode 23.
2 is provided on the surface of the insulating sheet 2 and the via hole 27 connected to the ground electrode 23 is provided on the right side.
2, an insulator sheet 22 provided with a via hole 28 on the right side, an insulator sheet 22 provided with a via hole 29 on the right side and a via hole 30b on the left side, and capacitor electrodes 24, 25 on the right side. The insulator sheet 22 is provided at the position and the position on the left side, the insulator sheet 22 provided with the capacitor electrode 26 on the surface, the insulator sheet 22 on the surface, and the like.

The end 23a of the ground electrode 23 is exposed on the left side of the sheet 22. Capacitor electrode 2
4 has an end 24a exposed at the right side of the sheet 22. The capacitor electrode 25 is not connected to any of the electrodes, and its outer peripheral edge portion is not exposed to the outer periphery of the sheet 22. The end 26 a of the capacitor electrode 26 is exposed on the left side of the sheet 22.

The via holes 27 to 29 are connected to each other to form the inductor conductor 30a, and the via hole 30b independently forms the inductor conductor 30b. Beer hole 2
The lower end surface 29a of 9 is directly connected to the central portion of the capacitor electrode 24. The axial direction of the inductor conductor 30a is parallel to the thickness direction of the sheet 22. On the other hand, the axial direction of the inductor conductor 30b is perpendicular to the thickness direction of the sheet 22. Both ends of the inductor conductor 30b are connected to the capacitor electrodes 24 and 25, respectively. That is, in terms of an electrical equivalent circuit, the inductor conductor 30a and the inductor conductor 30b are divided by the capacitor electrode 24, the inductor conductor 30a has an inductance L5, and the inductor conductor 30b has an inductance L6. There is.

The sheets 2 having the above-mentioned structure are stacked and then integrally sintered to form a laminated body. next,
As shown in FIG. 7, a ground external electrode 42 and an input / output external electrode 43 are formed on the left and right side surfaces of the laminated body, respectively. The end portion 23a of the ground electrode 23 and the end portion 26a of the capacitor electrode 26 are connected to the ground external electrode 42, and the capacitor electrode 2 is connected to the input / output external electrode 43.
4 ends 24a are connected.

The LC thus obtained, as shown in FIG.
In the filter 21, the inductance L of the inductor conductor 30a composed of the via holes 27 to 29 is included.
5 and the capacitance C5 generated between the capacitor electrodes 24 and 26 are combined to form an LC parallel resonance circuit,
A capacitance C generated between the inductance L6 of the inductor conductor 30b and the capacitor electrodes 25 and 26.
6 are combined to form an LC series resonant circuit. LC
The parallel resonant circuit and the LC series resonant circuit are connected in parallel between the input / output external electrode 43 and the ground external electrode 42.

Therefore, this LC filter 21 has a built-in LC parallel resonance circuit and LC series resonance circuit in one chip, and its attenuation characteristic has a pole formed on the high frequency side of the resonance frequency and at the high frequency side. The spurious will be improved.

[Third Embodiment, FIGS. 9 to 12] As shown in FIG. 9, the laminated LC filter 41 includes a ground electrode 4
3 and via hole 5 connected to this ground electrode 43
Insulator sheet 42 provided with 3, 63 and via hole 5
4, 64, the insulator sheet 42, the capacitor electrodes 44, 45, 46 and the via holes 55, 56, the insulator sheet 42, the capacitor electrodes 47, 48 and the via holes 56 connected to the capacitor electrodes 47, 48. , 6
6, the insulator sheet 42 provided with the capacitor electrode 49 and the insulator sheet 42 provided with the via holes 57 and 67,
Insulator sheet 42 provided with capacitor electrodes 50 and 51
And an insulator sheet 42 provided with a capacitor electrode 52,
It is made of an insulator sheet 42 or the like on the surface.

The ground electrode 43 has its end portions 43a, 4
3b are exposed on the front side and the back side of the sheet 42, respectively. The capacitor electrode 44 has an end 44a.
Is exposed on the left side of the seat 42. The capacitor electrode 45 is not connected to any of the electrodes, and its outer peripheral edge portion is not exposed to the outer periphery of the sheet 42. The end 46 a of the capacitor electrode 46 is exposed on the right side of the sheet 42. Capacitor electrodes 47, 48 and 50,
51 is not connected to any of the electrodes, and its outer peripheral edge portion is not exposed to the outer periphery of the sheet 42. The capacitor electrodes 49 and 52 have ends 49a, 49b and 5 respectively.
2a and 52b are exposed on the front side and the back side of the sheet 42. The capacitor electrode 49 has circular (or square) gaps 49c and 49d that leave the via holes 57 and 67 and their peripheral portions.

Via holes 53-57 and via holes 63-
67 are connected to form inductor conductors 58 and 68, respectively. The inductor conductor 58 is divided by the capacitor electrode 47 in terms of an electrical equivalent circuit, and has an inductor L11 and an inductor conductor 58a.
The inductor conductor 58b has an inductance L12. The inductor conductor 58a has via holes 53, 5
4, 55, and the inductor conductor 58b is composed of via holes 56, 57. Similarly, the inductor conductor 68 is equivalent to the capacitor electrode 48 in terms of an electrical equivalent circuit.
Are divided into an inductor conductor 68a having an inductance L13 and an inductor conductor 68b having an inductance L14. The inductor conductor 68a is composed of the via holes 63, 64 and 65, and the inductor conductor 68b is composed of the via holes 66 and 67.

The sheets 42 having the above-mentioned structure are stacked and then integrally sintered to form a laminated body. Next, as shown in FIGS. 10 and 11, the input / output external electrodes 71 and 72 are formed on the left and right side surfaces of the laminated body, and the ground external electrodes 73 and 72 are formed on the front and back side surfaces, respectively. 74 is formed. Input / output external electrode 71
Is connected to the end 44a of the capacitor electrode 44, and the input / output external electrode 72 is connected to the end 46a of the capacitor electrode 46.
Is connected to the ground external electrode 73, the end 43a of the ground electrode 43 and the ends 49a and 52a of the capacitor electrodes 49 and 52 are connected, and the ground external electrode 74 is connected to the end 43b of the ground electrode 43 and the capacitor. Electrode 4
The ends 49b and 52b of 9,52 are connected.

As shown in FIG. 12, L thus obtained
In the C filter 41, the inductance L11 of the inductor conductor 58a and the capacitance C11 generated between the capacitor electrodes 47 and 49 are combined to form LC.
The inductor L58 and the capacitor electrodes 49, 50, 5 which form the parallel resonance circuit and which the inductor conductor 58b has
The capacitance C12 generated between the two is combined to form an LC series resonant circuit.

Similarly, the inductance L13 of the inductor conductor 68a and the capacitance C13 generated between the capacitor electrodes 48 and 49 are combined to form LC.
The inductor L68 and the capacitor electrodes 49, 51, 5 which form the parallel resonance circuit and which the inductor conductor 68b has
The capacitance C14 generated between the two is combined to form an LC series resonant circuit.

The LC parallel resonance circuit and the LC series resonance circuit are
Input / output external electrodes 71, 72 and ground external electrode 7
It is connected in parallel relation between 3,74. In addition, the capacitance C1 generated between the capacitor electrodes 44 and 47
5, the capacitance C16 generated between the capacitor electrodes 45, 47 and 48 and the capacitance C17 generated between the capacitor electrodes 46 and 48 are respectively used as a coupling capacitor.

That is, the LC filter 41 includes two LC filters according to the first embodiment, and these two L filters are provided.
The C filter is two-stage coupled between the input / output external electrodes 71-72 via three coupling capacitors. Therefore, the LC filter 41 is the LC filter of the first embodiment.
Compared with the filter 1, a steeper filter characteristic can be obtained.

[Other Embodiments] The LC according to the present invention
The resonant component is not limited to the above embodiment, but can be variously modified within the scope of the gist thereof. For example,
In the first embodiment, the two insulator sheets 2 shown in FIG. 13 may be used instead of the insulator sheet 2 provided with the capacitor electrodes 4 on the surface. The two insulating sheets 2 each have an input / output extraction electrode 75 on the surface and a via hole 77 in the center, and an insulating sheet 2 having a capacitor electrode 76 on the surface and connected to the capacitor electrode 76. It is the insulator sheet 2 having the via hole 78 in the central portion. The input / output extraction electrode 75 and the capacitor electrode 76 are capacitively coupled. The end 75a of the extraction electrode 75 is exposed on the right side of the sheet 2. The via holes 77, 78 are the other via holes 8, 9, 1.
1, the via holes 8, 9 and 77 form the inductor conductor 12a, and the via holes 78 and 11 form the inductor conductor 12b.

Further, although the above embodiment has been described by taking the case of a single product production as an example, it goes without saying that in the case of mass production, the product is produced in a state of a mother sheet having a plurality of electrodes formed thereon. In this case, after stacking the mother sheets, the mother sheets are cut out for each predetermined product size. Further, in the above embodiment, the sheets are stacked and then integrally sintered, but the embodiment is not limited thereto. The sheet may be a sheet sintered in advance. Further, the LC resonance component may be manufactured by the manufacturing method described below. After applying a paste-like insulator material by printing or other means and drying it to form an insulator film, apply a paste-like conductor material to the surface of the insulator film and dry it to form a capacitor electrode or inductor conductor. Form. In this way, the resonance component having a laminated structure can be obtained by sequentially applying the layers.

[0032]

As is apparent from the above description, according to the present invention, since the series resonance circuit and the parallel resonance circuit are built in one chip, the pole is formed on the higher frequency side than the resonance frequency,
Further, it is possible to obtain an LC resonance component having an attenuation characteristic with improved spurious on the high frequency side. Also, since one of the inductor conductors divided by the capacitor electrode constitutes the inductance of the series resonance circuit and the other inductor conductor constitutes the inductance of the parallel resonance circuit, the inductor conductor and the capacitor electrode are connected. LC resonance component that is directly connected in the laminated body without interposing a conductor for use in the conductor, can suppress the influence of the inductance component of the conductor for connection itself, has improved shield resistance and radiation performance, and has good spurious characteristics. Becomes

Further, at least one of the inductor conductor forming the series resonance circuit and the inductor conductor forming the parallel resonance circuit is arranged vertically to the capacitor electrodes forming the series resonance circuit and the parallel resonance circuit. Therefore, the magnetic flux generated by the current flowing through the inductor conductor does not penetrate the capacitor electrode, and no eddy current is generated in the capacitor electrode. As a result, it is possible to obtain an LC resonant component having a high Q and a small eddy current loss.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an LC resonant component of a first embodiment according to the present invention.

FIG. 2 is a perspective view showing an appearance of the LC resonance component shown in FIG.

FIG. 3 is a sectional view taken along the line III-III of the LC resonance component shown in FIG.

4 is an electrical equivalent circuit diagram of the LC resonant component shown in FIG.

5 is a graph showing the attenuation characteristic of the LC resonant component shown in FIG.

FIG. 6 is an exploded perspective view showing an LC resonant component of a second embodiment according to the present invention.

7 is a sectional view of the LC resonance component shown in FIG.

8 is an electrical equivalent circuit diagram of the LC resonant component shown in FIG.

FIG. 9 is an exploded perspective view showing an LC resonance component of a third embodiment according to the present invention.

10 is a perspective view showing the appearance of the LC resonant component shown in FIG.

11 is a cross-sectional view taken along the line XI-XI of the LC resonance component shown in FIG.

12 is an electrical equivalent circuit diagram of the LC resonance component shown in FIG.

FIG. 13 is an exploded perspective view showing another embodiment.

FIG. 14 is an electric circuit diagram for explaining a conventional example.

FIG. 15 is an electric circuit diagram for explaining another conventional example.

[Explanation of symbols]

1, 21, 41 ... LC filter 2, 22, 42 ... Insulator sheet 3, 23, 43 ... Ground electrode 4-7, 24-26, 44-52 ... Capacitor electrode 12a, 12b, 30a, 30b, 58a, 58b , 6
8a, 68b ... Inductor conductor

Claims (3)

[Claims] 1. An LC resonance component, wherein a series resonance circuit and a parallel resonance circuit are built in one chip in order to form a pole on the high frequency side of the resonance frequency in the attenuation characteristic and improve spurious on the high frequency side. 2. An inductor conductor of one of the inductor conductors divided by the capacitor electrode constitutes an inductance of a series resonance circuit, and the other inductor conductor constitutes an inductance of a parallel resonance circuit. 1. The LC resonance component according to 1. 3. An inductor conductor of at least one of an inductor conductor forming a series resonance circuit and an inductor conductor forming a parallel resonance circuit is arranged vertically to a capacitor electrode forming a series resonance circuit and a parallel resonance circuit. The LC resonant component according to claim 1, wherein the LC resonant component is provided.