JP2000244268A - Lc complex parts and its resonance frequency adjusting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LC filter and its resonance frequency adjusting method by which a resonance frequency in an LC resonance circuit is easily adjusted with high precision and also a system is made to be small. SOLUTION: The LC filter 1 is provided with plural pattern electrodes 7a, 7b and 7c for adjusting the resonance frequency of the LC resonance circuit in a multi-layer substrate 2. A cavity 6 is formed on one main surface 3 of the substrate 2 and the pattern electrodes are respectively arranged in the cavity 6. Besides, the electrodes are trimmed from the side of one main surface 3 of the filter 1 through the cavity 6 so that the resonance frequency of the LC resonance circuit is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an LC composite component provided with a pattern electrode for adjusting a resonance frequency of a resonance circuit, and a method of adjusting the resonance frequency.

[0002]

2. Description of the Related Art In recent years, in high-frequency electronic components such as mobile communication devices, demands for miniaturization, high performance, high performance, and the like are strict. For example, LC composite components such as LC filters are
Particularly, for the purpose of miniaturization, it has been commercialized as a multilayer chip component in which a C component and an L component constituting an LC resonance circuit are built in a multilayer substrate.

Generally, in an LC composite component having an LC resonance circuit, it is necessary to adjust the resonance frequency of the LC resonance circuit.

For example, Japanese Patent Application Laid-Open No. 9-153737 discloses a technique for adjusting the oscillation frequency of an oscillator.
In an oscillator having a capacitor for adjusting the oscillation frequency, a method is disclosed in which a multilayer electrode constituting the capacitor is formed in a multilayer substrate, and the multilayer electrode is deleted by a hole provided from the bottom side of the multilayer substrate. ing.

According to this method, since the multilayer electrodes constituting the capacitor are formed in the multilayer substrate, the size of the oscillator can be reduced, and a metal case for protecting various mounted components is covered. If the frequency adjustment is performed later, the accuracy of the frequency adjustment can be improved. Furthermore, frequency adjustment is performed by partially removing holes through the multilayer electrodes of the capacitor, so that the diameter of the holes can be reduced, and the frequency adjustment can be performed without substantially reducing the shielding effect. it can.

[0006]

However, in the frequency adjusting method disclosed in Japanese Patent Application Laid-Open No. 9-153737, when the holes are formed by using, for example, a laser, the carbonization of the substrate material progresses and the holes are formed. It may be as if it were packed with a resistance material such as carbon,
This may cause fluctuations in the oscillation frequency and deterioration of substrate characteristics. Further, when trimming each of the multilayer electrodes constituting the capacitor, it is necessary to irradiate a high-intensity laser in order to form a through hole.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an LC composite circuit in which the resonance frequency of an LC resonance circuit can be adjusted easily and with high precision, and which has been reduced in size. An object of the present invention is to provide a component and a method of adjusting a resonance frequency thereof.

[0008]

That is, the present invention relates to an LC composite component in which a pattern electrode for adjusting a resonance frequency of an LC resonance circuit is provided in a multilayer substrate. A cavity is formed on the main surface,
According to an LC composite component, the pattern electrode is provided in the cavity.

Further, the LC composite component according to the present invention is characterized in that a plurality of the pattern electrodes respectively connected to a plurality of LC resonance circuits are provided in the cavity.

The LC composite component of the present invention is characterized in that a mounted component is mounted on the other main surface of the multilayer substrate.

Further, the present invention provides a method of adjusting the resonance frequency of the LC resonance circuit in the LC composite component according to the present invention.
An object of the present invention is to provide a method of adjusting a resonance frequency of an LC composite component, comprising trimming the pattern electrode provided in the cavity.

According to the LC composite component of the present invention, there is provided an LC composite component in which a pattern electrode for adjusting a resonance frequency of an LC resonance circuit is provided in a multi-layer substrate. Since the cavity is formed and the pattern electrode is provided in the cavity, miniaturization of the LC composite component is achieved,
Adjustment of the resonance frequency in the resonance circuit can be easily and accurately performed.

According to the resonance frequency adjusting method of the present invention, when the resonance frequency of the LC resonance circuit in the LC composite component of the present invention is adjusted, the pattern electrode provided in the cavity is trimmed. Adjustment of the resonance frequency in the LC resonance circuit can be performed easily and with high accuracy without causing frequency fluctuation and deterioration of substrate characteristics.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an LC composite component and a method of adjusting a resonance frequency thereof according to the present invention will be described with reference to an embodiment.

First Embodiment As shown in FIG. 1, an LC composite component according to the present embodiment is formed on one main surface 3 of a multilayer substrate 2 in which dielectric layers 2a, 2b and 2c are laminated. LC in the cavity 6
Pattern electrode 7 for adjusting the resonance frequency of the resonance circuit
a, 7b and 7c are provided, and the external electrodes 5a and 5a electrically connected to the internal LC resonance circuit are provided on the side surfaces of the multilayer substrate 2.
b is the LC filter 1 formed.

That is, as shown in FIG.
Is a dielectric layer 2a having a cavity 6 of a predetermined size,
A dielectric layer 2b having pattern electrodes 7a, 7b and 7c for adjusting the resonance frequency of the LC resonance circuit, a dielectric layer 2c having electrodes and via holes (not shown) constituting the C and L components of the LC resonance circuit. Are sequentially laminated.

As shown in FIG. 3, the LC filter 1 includes a first LC resonance circuit including C1 and L1, a second LC resonance circuit including C2 and L2, and a third LC resonance circuit including C3 and L3. Each of the three LC resonance circuits is incorporated. Then, the L components L1 and L
2, L2 and L3 are electromagnetically coupled to each other (M1,
M2), and the pattern electrodes 7a, 7b and 7c
It is an electrode for forming each C component of C1, C2 and C3.

Therefore, by trimming the pattern electrodes 7a, 7b and 7c forming the C component of each LC resonance circuit, respectively, the first LC resonance circuit, the second LC resonance circuit, and the third LC resonance circuit are trimmed. Is adjusted, and the resonance frequency of the LC filter 1 is set.

As described above, according to the LC filter 1 according to the present embodiment, since the components of the LC resonance circuit, including the pattern electrodes 7a, 7b and 7c, are formed in the multilayer substrate 2, the LC filter 1 1 has been achieved.

Further, the pattern electrodes 7a, 7b and 7c are provided in the cavity 6, and the pattern electrodes are trimmed through the cavity 6 by irradiating, for example, a laser from one main surface side. The laser beam hardly advances, and a laser having a relatively small intensity can be sufficiently trimmed. Therefore, the resonance frequency can be easily and accurately adjusted while maintaining the resonance frequency and the substrate characteristics.

Further, when the LC filter 1 is mounted on the mounting substrate, the pattern electrodes 7a, 7b and 7c are not in contact with the mounting substrate, so that a change in characteristics due to contact (adhesion) with the mounting substrate can be avoided. In particular, when a through hole is formed in the mounting board, if the mounting board and the pattern electrode come into contact, the trimmed pattern electrode will come into contact with the ground etc. of the mounting board, and the trimming will not be meaningful. On the other hand, the L component of the LC resonance circuit may come into contact with the ground of the mounting board, and the characteristics may fluctuate greatly. Furthermore, even when no through-hole is formed in the mounting substrate, when the mounting substrate and the pattern electrode come into contact with each other, a capacitance component is generated between the pattern electrode and the mounting substrate, and the characteristics greatly fluctuate. Sometimes.

Further, since a plurality of pattern electrodes 7a, 7b and 7c connected to a plurality of LC resonance circuits are provided in the cavity 6, for example, after the trimming amounts of the pattern electrodes 7a, 7b and 7c are determined, , The resonance frequency is measured, and the result is fed back to trim the pattern electrodes 7a, 7b, and 7c again. Thus, even if the trimming is repeatedly performed, the resonance frequency can be easily and accurately adjusted. be able to. On the other hand, when trimming through the substrate material, a laser or the like having a high intensity is required each time, and further, the holes formed in the substrate material become large,
The variation may increase and the resonance frequency may fluctuate. Alternatively, the material carbonized by the trimming may adhere to the electrode and degrade the high frequency characteristics.

In the present embodiment, the pattern electrodes 7a, 7b and 7c are formed as electrodes for forming the C component of each LC resonance circuit.
It may be an electrode for forming an L component such as a strip line or a micro strip line, or may be an adjustment land for adjusting a resonance frequency. However, it is easier to trim the C component and adjust the resonance frequency than to trim the L component of the LC resonance circuit and adjust the resonance frequency. It is desirable that the electrodes constitute the components.

Second Embodiment As shown in FIG. 4, an LC composite component according to the present embodiment has a cavity 16 formed in one main surface 13 of a multilayer substrate 12 formed by laminating a plurality of dielectric layers. A pattern electrode 17a for adjusting the resonance frequency of the LC resonance circuit;
This is a high-frequency composite component 11 provided with 17b and 17c and further formed with external electrodes 15a and 15b, 18a and 18b on side surfaces of the multilayer substrate 12, respectively.

As shown in FIG. 5, on the other main surface 14 of the high-frequency composite component 11, an IC chip and a chip capacitor connected to the LC resonance circuit in the multilayer substrate 12, the surface wiring on the other main surface 14, and the like are provided. And the like, and the pattern electrode 1 as in the first embodiment.
7a, 17b and 17c represent the C of each of the three LC resonance circuits.
It is an electrode that forms the components. Therefore, by trimming the pattern electrodes 17a, 17b and 17c forming the C component of each LC resonance circuit through the cavity 16, respectively, the resonance frequency of the LC resonance circuit in the high-frequency composite component 11 is adjusted.

As described above, according to the high-frequency composite component 11 of the present embodiment, the pattern electrodes 17a, 17b, and 17c for adjusting the resonance frequency of the LC resonance circuit are formed in the multilayer substrate 12. On the other hand, there is no need to provide a land or the like for frequency adjustment on
, And the miniaturization of the high-frequency composite component 11 can be achieved.

The pattern electrodes 17a, 17b and 1
Since 7c is provided in the cavity 16, when trimming the pattern electrodes 17a, 17b and 17c, carbonization of the substrate material hardly progresses even when trimming is performed using, for example, a laser. Further, the resonance frequency can be adjusted after the other main surface 14 is covered with a metal case or the like for shielding. Furthermore, trimming can be performed with a laser having a relatively small intensity. Therefore, the resonance frequency can be easily and accurately adjusted while maintaining the resonance frequency and the substrate characteristics. Further, when the high-frequency composite component 11 is mounted on a printed board or the like, the pattern electrodes 17a, 17b, and 17c are not in contact with the mounting board, so that a characteristic change due to contact (adhesion) with the mounting board can be avoided.

Further, similarly to the first embodiment, a plurality of pattern electrodes 17a connected to a plurality of LC resonance circuits,
17b and 17c are provided in the cavity 16, respectively. For example, after determining the trimming amounts of the pattern electrodes 17a, 17b and 17c, the resonance frequency is measured, and the result is fed back to the pattern electrode 17a again. , 17b, and 17c can be adjusted easily and with high precision even if trimming is repeatedly performed. On the other hand, in the case of trimming through the substrate material, a laser or the like having a high intensity is required each time, and the holes formed in the substrate material are enlarged, the variation is increased, and the resonance frequency fluctuates. Sometimes. Alternatively, the material carbonized by the trimming may adhere to the electrode and degrade the high frequency characteristics.

As described above, the present invention relates to the first embodiment and the second embodiment.
Although the embodiments have been described, the present invention is not limited to these embodiments.

For example, when mounting the LC filter 1 on a mother substrate made of resin or ceramic, one main surface 3 of the LC filter 1 may be used as a contact surface with the mother substrate,
On the other hand, main surface 4 may be a contact surface with the motherboard.

The LC filter 1 and the high-frequency composite component 1
In 1, after adjusting the resonance frequency of the LC resonance circuit, the cavity 6 or 1 is embedded by embedding a dielectric or the like.
6 may be sealed. With such a structure, contact between each pattern electrode and the mother substrate can be avoided, and at the same time, contact between the pattern electrode and the outside air can be avoided.

The trimming of the pattern electrode for adjusting the resonance frequency of the LC resonance circuit is not limited to the trimming using a laser, but may be another process such as a blast method.

The number of the pattern electrodes is not limited to three, but may be one, or may be an arbitrary plural number of two or more. The same applies to the number of LC resonance circuits. Further, the number of LC resonance circuits and the number of pattern electrodes do not need to match, for example, one LC
Two pattern electrodes may be formed for the resonance circuit.

Further, the LC composite component of the present invention is not limited to the LC filter 1 and the high-frequency composite component 11 having the above-described configurations, but can be applied to various electronic circuit components having an LC resonance circuit.

[0035]

According to the LC composite component of the present invention, a cavity is formed on one main surface of the multilayer substrate, and a pattern electrode for adjusting the resonance frequency of the LC resonance circuit is provided in the cavity. Therefore, the size of the LC composite component can be reduced, and when the resonance frequency of the LC resonance circuit is adjusted, the adjustment of the resonance frequency can be easily and accurately performed.

In the LC composite component of the present invention, if a plurality of pattern electrodes respectively connected to a plurality of LC resonance circuits are provided in the cavity, especially when each pattern electrode is repeatedly trimmed, the substrate material As compared with the method of trimming through the method, the variation of the resonance frequency and the deterioration of the high frequency characteristic due to the carbonization of the substrate material are reduced, and the adjustment of the resonance frequency can be performed easily and with high accuracy.

Further, in the LC composite component of the present invention, there is no need to provide a pattern electrode for frequency adjustment on the other main surface, and various mounting components such as IC chips and laminated chips are mounted on the other main surface of the multilayer substrate. In this case, the mounting density of mounting components such as IC chips and multilayer chip components can be improved.

Further, according to the resonance frequency adjusting method of the present invention, the pattern electrode provided in the cavity is trimmed from one main surface side via the cavity, so that the resonance frequency fluctuates and the substrate characteristics deteriorate. Therefore, the resonance frequency of the LC resonance circuit can be easily and accurately adjusted.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of one main surface side of an LC filter according to a first embodiment of the present invention.

FIG. 2 is a schematic exploded view of one main surface side of the LC filter according to the first embodiment of the present invention.

FIG. 3 is an equivalent circuit diagram of the LC filter according to the first embodiment of the present invention.

FIG. 4 is a schematic perspective view of the other main surface side of the LC filter according to the first embodiment of the present invention.

FIG. 5 is a schematic perspective view of an LC composite component according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... LC filter 2 ... Multilayer board 2a, 2b, 2c ... Dielectric layer 3 ... One main surface 4 ... The other main surface 5a, 5b ... External electrode 6 ... Cavity 7a, 7b ... Pattern electrode

Continued on front page F-term (reference) 5E070 AA05 AB03 AB10 CB13 CB17 CB20 DA05 DB08 EA01 5E082 AA01 BC12 DD08 DD15 MM05 5J014 CA03 CA55 5J024 AA02 AA10 BA19 CA04 CA06 DA03 DA21 DA32 DA35 EA03

Claims (4)

[Claims] 1. An LC in which a pattern electrode for adjusting a resonance frequency of an LC resonance circuit is provided in a multilayer substrate.
An LC composite component, comprising: a composite component, wherein a cavity is formed on one main surface of the multilayer substrate, and the pattern electrode is provided in the cavity. 2. The LC composite component according to claim 1, wherein a plurality of pattern electrodes respectively connected to a plurality of LC resonance circuits are provided in the cavity. 3. The L according to claim 1, wherein a mounting component is mounted on the other main surface of the multilayer substrate.
C composite parts. 4. The LC according to claim 1, wherein:
A method of adjusting the resonance frequency of an LC composite component, comprising trimming the pattern electrode provided in the cavity when adjusting the resonance frequency of the LC resonance circuit in the composite component.