JPH08107040A - Electronic component including parallel resonator of inductor and capacitor and method for regulating frequency thereof - Google Patents

Abstract

PURPOSE: To make it possible to regulate the frequency within a specified range by a method wherein a capacitor which is one constituent of a parallel resonator is divided into a plurality of capacitor elements and the frequency is regulated by trimming a capacitor electrode, one of the divided capacitor elements. CONSTITUTION: At the bottom in the thickness direction of a band pass filter, a protective layer 1 is formed. On the protective layer 1, a dielectric layer 3, a print coil 4, another dielectric layer 5, a capacitor forming layer 7, a capacitor forming layer for regulating input and output impedances 9, a capacitor forming layer 11 for a resonance circuit, a capacitor forming layer for regulating a frequency 13, second capacitor electrode layers for 2 resonance circuit 14a, 14b, and a protective layer 15 are formed in this order. Trimming of this filter is performed by trimming the second capacitor electrode layers 14a, 14b together with the protective layer 15 in the upper layer. By this method, the frequency can be regulated within a specified range even if the whole part of the electrodes is removed by trimming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency adjusting method for an electronic component including a parallel resonator of an inductor and a capacitor and having a laminated structure, and an electronic component thus adjusted.

[0002]

2. Description of the Related Art Frequency adjustment of a laminated electronic component including a parallel resonator of an inductor and a capacitor is possible by trimming an inductor electrode or a capacitor electrode exposed or closest to the outer surface. It can be said that it is desirable to trim the capacitor electrode in order to avoid deterioration of the Q characteristic.

Incidentally, the frequency adjustment of the resonator does not require a wide range, and it is usually sufficient to adjust the amount of deviation of the resonance frequency from the standard due to manufacturing error. However, the method of removing the electrodes by trimming may remove all the target electrodes, and in that case, there is a problem that the configuration of the resonator is lost beyond the necessary adjustment range of the resonance frequency.

In view of the above points, it is an object of the present invention to provide a useful method capable of suppressing the adjustment of the resonance frequency in a required range even if all electrodes are trimmed and removed, and an electronic component having such a configuration. .

[0005]

The present invention provides at least one parallel resonator in which a plurality of dielectric layers and a plurality of electrodes are laminated, and an inductor and a capacitor formed by the plurality of electrodes are connected in parallel. A method of adjusting the frequency of an electronic component including two, wherein the capacitor is formed of a plurality of divided capacitors, and one of the divided capacitors is trimmed to adjust the frequency. To do.

An electronic component including at least one parallel resonator in which a plurality of dielectric layers and a plurality of electrodes are laminated, and an inductor and a capacitor formed by the plurality of electrodes are connected in parallel, The capacitor is divided into a plurality of parts, and one of the electrodes forming the divided capacitor is trimmed.

[0007]

In the present invention, the capacitor, which is a constituent element of the parallel resonator, is divided into a plurality of capacitors, and the electrode of one capacitor is trimmed and removed.
Even if all the electrodes are trimmed, the configuration of the parallel resonator remains due to the remaining capacitor electrodes and inductors. Therefore, the range in which the frequency can be adjusted by trimming is limited.

[0008]

FIG. 2 is an exploded perspective view showing a bandpass filter to which the frequency adjusting method of the present invention is applied, and FIG. 3 is a front sectional view thereof. This filter is formed by appropriately stacking a green sheet made of unfired dielectric material and an electrode layer made of a conductive material formed on one side of the green sheet by printing or the like, and also made of a conductive material on its side surface. It is manufactured by firing a connection terminal formed by printing or the like.

A protective layer 1 is formed at the bottom in the thickness direction,
On top of that, the shield electrode layers 2a and 2b, the dielectric layer 3,
Print coil 4 (consisting of 4a, 4b and 4c), dielectric layer 5, pole forming capacitor electrode layer 6, capacitor forming layer 7, input / output impedance adjusting capacitor electrode layers 8a and 8b, input / output impedance adjusting capacitor forming Layer 9, first capacitor electrode layers 10a, 1 for resonance circuit
0b, resonant circuit capacitor forming layer 11, shield electrode layers 12a and 12b, frequency adjusting capacitor forming layer 1
3, second capacitor electrode layers 14a and 14b for resonance circuit,
The protective layer 15 is sequentially formed, and eight connection terminals 16a to 16h having a U-shaped cross section are formed on the side surface. That is, in this filter, it is planned that the protective layer 15 is already formed on the second capacitor electrode layers 14a and 14b for resonance circuit when the filter is manufactured.

The print coil 4 is, as shown in FIG.
The three print coils 4a, 4b, 4c are provided, and both ends of the two resonance circuit print coils 4a, 4b are connected to hot (input / output) connection terminals 16b, 16c and ground connection terminals 16e, 16h, respectively. The two print coils 4a and 4b are connected to each other with a magnetic coupling degree M with their hot sides being close to each other, and the ground side is connected with a pole forming print coil 4c.

The shield electrode layers 12a and 12b on the upper side of the print coil 4 are formed so as to be separated from each other as shown by the solid line in FIG. The first capacitor electrode layers 10a and 10b for the resonance circuit in FIG. 2 are opposed to the shield electrode layers 12a and 12b as indicated by the broken lines in the figure. One resonance circuit first capacitor electrode layer 10a is connected to an input connection terminal 16b to which one end side of the print coil 4a is connected, and the shield electrode layer 12a facing the capacitor electrode layer 10a is the other end of the print coil 4a. The resonance circuit capacitor forming layer 11 made of a dielectric material is interposed between the two electrode layers 12a and 10a.
A capacitor C2 is formed. On the other hand, the resonance circuit second capacitor electrode layer 14a faces the shield electrode layer 12a through the frequency adjustment capacitor formation layer 13 to form the resonance circuit second capacitor C2x, and
This second capacitor electrode layer 14a is the input / output connection terminal 1
Since it is connected to the first capacitor electrode layer 10a via 6b, the first resonant circuit capacitor C2 and the second capacitor C2x are connected in parallel, and have a combined capacitance of C2 + C2x. And this capacitor C2 +
C2x and the inductor L1 formed by the print coil 4a are connected via connection terminals 16b and 16e to form an LC resonance circuit. The resonance frequency of the LC resonance circuit is made variable by performing a trimming process on the resonance circuit second capacitor electrode layer 14a forming the resonance circuit second capacitor C2x. The shield electrode layers 2a and 2b below the print coil 4 are provided.
Also, although the two are separated as shown by the solid line in FIG. 5, they may be integrated without being separated.

The other capacitor circuit first capacitor electrode layer 1
0b is connected to the input connection terminal 16c to which one end side of the print coil 4b is connected.
The shield electrode layer 12b facing b is the printed coil 4
The resonance circuit capacitor forming layer 11 made of a dielectric material is interposed between the two electrode layers 12b and 10b. The first capacitor C4 for use is formed. Similarly, a second capacitor C4x is formed between the resonance circuit second capacitor electrode layer 14b and the shield electrode layer 12b, and the first capacitor electrode layer 10b and the second capacitor electrode layer 14b are formed via the input / output connection terminal 16c. Is connected, the first capacitor C4 and the second capacitor C4x are connected in parallel to form a capacitor having a combined capacitance C4 + C4x. Then, an inductor L2 formed by the composite capacitor C4 + C4x and the print coil 4b.
Is connected via the connection terminals 16c and 16h to LC
It forms a resonant circuit. The resonance frequency of this LC resonance circuit is made variable by trimming the second capacitor electrode layer 14b.

The print coil 4b forming the LC resonance circuit and the print coil 4a forming the LC resonance circuit described above are connected by the print coil 4c for pole formation described above. The inductor of the print coil 4c is L5. Below the capacitor electrode layers 10a and 10b, which are one of the electrodes forming the first capacitors C2 and C4 for the resonance circuit, there is an L-shaped input / output impedance adjustment as shown by the chain line in FIG. The capacitor electrode layers 8a and 8b are formed so as to be separated from each other, and the input / output impedance adjusting capacitor forming layer 9 made of a dielectric material is provided between the input impedance adjusting capacitor layer 8a and the resonance circuit first capacitor electrode layer 10a. Via the input impedance adjustment capacitor C
1 is formed, and one input capacitor electrode layer 8a forming this capacitor is connected to the input connection terminal 16a.

On the other hand, the output impedance adjusting capacitor electrode layer 8b and the resonance circuit first capacitor electrode layer 10b.
And a capacitor C3 for output impedance adjustment is formed via an input / output impedance adjustment capacitor forming layer 9 made of a dielectric, and one output capacitor electrode layer 8b forming this capacitor C3 is connected for output. It is connected to the terminal 16d.

Below the above-mentioned input / output impedance adjusting capacitor electrode layers 8a and 8b, one pole forming capacitor electrode layer 6 is formed via a capacitor forming layer 7, and both sides of this capacitor electrode layer 6 are formed. Are opposed to the capacitor electrode layers 8a and 8b, and pole forming capacitors C5 and C5 are formed. Therefore, the input / output capacitor electrode layers 8a and 8b are formed between the both ends of the pole-forming capacitor electrode layer 6 and the capacitors C5 and C5.
The pole-forming capacitor electrode layer 6 is connected via C5.

Therefore, the bandpass filter having the above-mentioned structure has the inductor L1 and the capacitor C2 + as shown in FIG.
The first LC resonance circuit Q1 composed of C2x and the second LC resonance circuit Q2 composed of the inductor L2 and the capacitor C4 + C4x form a magnetic coupling degree M between the inductors L1 and L2.
In addition to having a basic configuration coupled with, on the hot input / output connection terminal side between the two resonance circuits Q1 and Q2,
In this example, specifically, a pole forming capacitor C is provided between the input / output impedance adjusting capacitors C1 and C3.
5 are connected in parallel, and two resonance circuits Q1 and Q
The circuit configuration is such that the pole forming inductor L5 is connected between the two terminals between the grounding connection terminals. It should be noted that L3 and L4 are the inductance of the ground connection terminal 16e connected to the shield electrode layer 12a and the inductance of the ground connection terminal 16h connected to the shield electrode layer 12b.

FIG. 7 is a frequency characteristic diagram of the bandpass filter having this structure. As the frequency characteristic, the pole forming inductor L5 and the pole forming capacitor C5 are shown.
Of the poles P1 and P2 on both sides of the center frequency f ₀
Has been formed. The solid line shows the attenuation rate, and the broken line shows the insertion loss. Next, a method of adjusting the frequency of the bandpass filter thus configured will be described. Target points of trimming in this filter are the second capacitor electrode layers 14a and 14b for resonance circuit described above.
According to the method of the present invention, the second capacitor electrode layer 14 is
This is a method of trimming and removing a and 14b together with the upper protective layer 15.

When trimming is performed in this manner, there is a protective layer 15 having a property of being difficult to extend onto the second capacitor electrode layers 14a and 14b, as shown in FIG. 1, even if sandblasting is used for trimming. Therefore, the second capacitor electrode layers 14a and 14b thereunder are also difficult to extend,
Therefore, the cut surfaces (the processed bottom surface and side surfaces) are in a beautiful state without any unevenness. As a result, accurate trimming is possible.

FIG. 8 shows the second capacitor electrode layers 14a, 1
4B is a frequency characteristic diagram showing a case where all 4b are trimmed (a solid line indicates an attenuation factor and a broken line indicates an insertion loss), and the trimming can increase the center frequency f ₀ by about 26 MHz from the state of FIG. 7. Since the amount of increase in the center frequency f ₀ changes according to the trimming area of the capacitance forming electrode layers 14a and 14b, in the case of this filter, trimming is performed by changing the trimming area to maximize about 26 MHz. The frequency can be adjusted accurately within that range.

Next, a case where the present invention is applied to a resonator will be described. 9 is a front sectional view of the resonator, FIG. 10 is a plan view mainly showing an inductor portion, and FIG. 11 is a plan view showing a capacitor portion. This resonator has a structure similar to that obtained by dividing two resonance circuits provided in the above-mentioned bandpass filter into two parts. A protective layer 21 is formed at the lowermost portion in the thickness direction, and a shield electrode layer is formed thereon. 22, dielectric layer 23, printed coil 24, dielectric layer 25, first capacitor electrode layer 26 for resonance circuit, capacitor formation layer 27 for resonance circuit, shield electrode layer 28, frequency adjustment capacitor formation layer 29, for resonance circuit The second capacitor electrode layer 30 and the protective layer 31 are sequentially formed, and two connection terminals 32 and 33 are formed on the side surface.

Even when the present invention is applied to this resonator, since the second capacitor electrode layer 30 is trimmed and removed in the state where the protective layer 31 is present on the resonator, the cut surface may be uneven. It is possible to trim beautifully and accurately. The result of this trimming, the resonance frequency f _r of about 932MHz as shown in FIG. 12 until then, it has become possible to 950MHz just adjusted for the purpose.

In the above two embodiments, sandblasting is taken as an example of means for trimming, but the means applicable to the present invention is not limited to this.
Accurate trimming is also possible when using lasers and routers. However, when a laser or the like is used, it is necessary to slightly increase the depth of trimming processing.

In the above embodiment, the electronic component having the protective layer formed outside the second capacitor electrode is trimmed. However, the present invention is not limited to this.
When the capacitor electrode is the exposed outermost layer, a protective layer made of a dielectric material may be formed on the outermost layer and trimming may be performed. Further, the material of the protective layer is not limited to the dielectric material, and a general ceramic material may be used. When a ceramic layer such as a protective layer is formed on the outer side of the second capacitor electrode as in the present invention, the second capacitor electrode is prevented from peeling off in the barrel process at the time of manufacturing a resonator or a filter. There is an advantage that can be done.

[0024]

As described above, according to the present invention, the capacitor, which is a component of the parallel resonator, is divided into a plurality of capacitors, and one of the capacitor electrodes is trimmed and removed to adjust the frequency. Therefore, it is possible to suppress the frequency adjustment range to a required range, and it is possible to finely adjust the frequency by appropriately setting the area of the electrode to be trimmed and the interval between the electrode and the counter electrode.

[Brief description of drawings]

FIG. 1 is a sectional view showing a trimmed portion according to the present invention.

FIG. 2 is a plan view showing a bandpass filter to which the method of the present invention is applied.

FIG. 3 is a front sectional view of a bandpass filter to which the method of the present invention is applied.

FIG. 4 is a plan view mainly showing an inductor portion of a bandpass filter to which the method of the present invention is applied.

FIG. 5 is a plan view showing a capacitor portion of a bandpass filter to which the method of the present invention is applied.

FIG. 6 is an equivalent circuit diagram of the filter of FIG.

FIG. 7 is a frequency characteristic diagram of the filter of FIG.

FIG. 8 is a frequency characteristic diagram in the case where all the frequency adjusting capacitor electrodes of the filter of FIG. 2 are removed.

FIG. 9 is a front sectional view of a resonator to which the present invention is applied.

FIG. 10 is a plan view mainly showing an inductor portion of a bandpass filter to which the method of the present invention is applied.

FIG. 11 is a plan view showing a capacitor portion of a bandpass filter to which the method of the present invention is applied.

FIG. 12 is a frequency characteristic diagram of a bandpass filter to which the method of the present invention is applied.

FIG. 13 is a frequency characteristic diagram after trimming.

[Description of sign]

 14a, 14b, 30 Frequency adjusting capacitor 15, 31 Protective layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical location H01G 4/38 4/40 H03H 5/02 8321-5J 7/01 B 8321-5J 7924-5E H01G 4/38 7924-5E 4/40 321 (72) Inventor Teruhisa Tsuru 2 26-10 Tenjin Tenjin, Nagaokakyo City, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Tetsuo Taniguchi 2 26-10 Tenjin Nagaokakyo, Kyoto Prefecture No. Stock Company Murata Manufacturing Co., Ltd. (72) Inventor Ken Tonegawa No. 26-10 Tenjin Tenjin, Nagaokakyo City, Kyoto Prefecture Murata Manufacturing Co., Ltd.

Claims (2)

[Claims] 1. A frequency adjusting method for an electronic component, comprising at least one parallel resonator in which a plurality of dielectric layers and a plurality of electrodes are laminated, and an inductor and a capacitor formed by the plurality of electrodes are connected in parallel. Wherein the capacitor is formed by a plurality of divided capacitors, and frequency adjustment is performed by trimming one electrode layer of the divided capacitors. An inductor and a capacitor are connected in parallel. For adjusting the frequency of an electronic component including at least one parallel resonator that has been set. 2. An electronic component including at least one parallel resonator in which a plurality of dielectric layers and a plurality of electrodes are laminated, and an inductor and a capacitor formed by the plurality of electrodes are connected in parallel, An electronic component, wherein the capacitor is divided into a plurality of parts, and one of electrodes forming the divided capacitor is trimmed.