JPH10209726A - Resonator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resonator capable of miniaturization for which possibility of deteriorated Q is precluded. SOLUTION: A ground electrode 3 and a conductor line 4 are provided to a board 2 of a resonator 1. The conductor line 4 is formed nearly in a meandering line by connecting planar electrodes 5a-5c, formed as a strip line and vertical electrodes 6a-6c, and connected to a ground electrode 3 via a vertical electrode 6c. Furthermore, a ratio of the planar electrodes 5a-5c and a ratio of the vertical electrodes 6a-6c shared on the entire length of the conductor line 4 are substantially equal to each other. Thus, a conductor loss produced in the planar electrodes 5a-5c does not give dominating effects on the characteristic of the resonator 1 and the possibility of deteriorated Q value due to the conductor loss is precluded. Moreover, since the conductor line 4 is formed substantially in a meander line, the outer size of the board 2 is reduced, and miniaturization of the resonator 1 is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonator, and more particularly to a resonator used for a voltage controlled oscillator or the like.

[0002]

2. Description of the Related Art The structure of a conventional resonator will be described with reference to FIG.

In FIG. 9, reference numeral 31 denotes a resonator, which includes a substrate 32 made of a dielectric material such as ceramic. Substrate 32
Has a ground electrode 33, a plane electrode 34 and a vertical electrode 3
5 are provided. Among them, the ground electrode 33 is formed on one main surface 32a of the substrate 32,
The plane electrode 34 is formed in a strip line shape on the other main surface 32 b of the substrate 32. The vertical electrode 35 is formed by filling a through hole 37 penetrating the substrate 32 in the thickness direction with a conductor, and is formed continuously near one end of the plane electrode 34. The resonator 31 configured as above is
Resonance is caused by an inductance component generated by the plane electrode 34 and the vertical electrode 35 and a capacitance component generated between the plane electrode 34 and the ground electrode 33.

Next, the configuration of another conventional resonator will be described with reference to FIG.

In FIG. 10, reference numeral 41 denotes a resonator, which includes a substrate 42 made of a dielectric material such as ceramic. Substrate 4
2, a ground electrode 43 and a conductor line 44 are provided. Here, the ground electrode 43 is connected to one main surface 42 of the substrate 42.
a and are provided continuously and integrally on the side surface.
The conductor line 44 is formed by filling a through hole 45 penetrating the substrate 42 in the thickness direction with a conductor, and is connected to the ground electrode 43. Resonator 41 thus configured
Is an inductance component of the conductor line 44, and
Resonance is caused by a capacitance component generated between the conductor line 44 and the ground electrode 43.

[0006]

However, in the conventional resonator 31, the length of the plane electrode 34 is much larger than the length of the vertical electrode 35, and occupies most of the conductor line 36. Further, the longitudinal direction of the plane electrode 34 is parallel to the surface of the ground electrode 33, and a capacitance is easily generated between the plane electrode 34 and the ground electrode 33.
For this reason, the characteristics of the resonator 31 are likely to be reduced due to the effect of conductor loss due to the characteristics of the conductor constituting the plane electrode 34. That is, if the conductor loss of the plane electrode 34 is large, the resistance R increases in the following equation (1) representing the Q value, and the Q value decreases.

Q = ωL / R (1) In the resonator 41, the resonance frequency is
If the resonance frequency is set low in proportion to the length of the substrate 4, the thickness of the substrate 42 must be increased in order to increase the length of the conductor line 44, making it difficult to reduce the size.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a resonator which can be reduced in size without a risk of a decrease in the Q value.

[0009]

According to the present invention, there is provided a resonator according to the present invention, wherein a conductor line and a ground electrode are provided on a dielectric substrate. Lines, a plurality of planar electrodes arranged so that the longitudinal direction is substantially parallel to the ground electrode, and a plurality of vertical electrodes arranged such that the longitudinal direction is substantially perpendicular to the ground electrode Is connected, thereby suppressing generation of capacitance between the conductor line and the ground electrode.

[0010] Further, the ground electrode includes a main surface of the substrate,
Alternatively, the conductor line is provided in the middle of the main surface and the thickness direction of the substrate, and the conductor line is the main surface of the substrate, or
A plurality of plane electrodes provided in the middle of the main surface and the thickness direction of the substrate, and a plurality of vertical electrodes provided in a plurality of holes formed in the thickness direction of the substrate are connected to each other to form a substantially meandering shape. Wherein the conductor line is connected to the ground electrode.

According to the resonator of the present invention, since the conductor line is constituted by the plurality of plane electrodes and the plurality of vertical electrodes, the ratio of the plane electrode to the conductor line can be reduced. As a result, the conductor loss generated between the plane electrode and the ground electrode does not have a dominant effect on the characteristics of the resonator, and the Q value is not likely to be reduced by such a conductor loss.

Further, according to the resonator of the present invention, since the conductor line is formed in a substantially meandering shape, the substrate on which the conductor line is provided can be reduced in size, thereby realizing a smaller resonator. can do.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a resonator according to a first embodiment of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes a resonator provided with a substrate 2. A ground electrode 3 is provided on one main surface 2a of the substrate 2, and one main surface 2a, the other main surface 2b and the substrate 2 of the substrate 2 are provided.
Is provided with a conductor line 4. Here, the conductor line 4 includes three plane electrodes 5a, 5b, 5c formed in a strip line shape and three vertical electrodes 6a, 6a.
b, 6c. Of these, the flat electrode 5a has one end provided in contact with the edge of the other main surface 2b of the substrate 2 and serves as a signal input end, and the flat electrode 5b is provided at an interval from the flat electrode 5a. Can be In addition, the plane electrode 5c
Is provided on one main surface 2a of substrate 2 at a position corresponding to between flat electrodes 5a and 5b. Note that the plane electrode 5c is provided with a gap G between the plane electrode 5c and the ground electrode 3. The vertical electrodes 6a, 6b, 6c are formed by applying a conductor to the inner peripheral surfaces of three holes 7a, 7b, 7c penetrating the substrate 2 in the thickness direction, respectively. Thereby, the plane electrode 5a and the plane electrode 5c are connected, the plane electrode 5c and the plane electrode 5b are connected by the vertical electrode 6b, and the plane electrode 5b and the ground electrode 3 are connected by the vertical electrode 6c. In this way, by connecting these planar electrodes and each vertical electrode to be integrally formed, the conductor line 4 has a substantially meandering shape. Further, the planar electrodes 5a to 5c and the vertical electrodes 6a to 6c are formed so that their lengths are equal to each other. The resonator 1 resonates with an inductance component caused by the conductor line 4 and a capacitance component generated between the conductor line 4 and the ground electrode 3.

Here, the plane electrode 5 forming the conductor line 4
Since a to 5c are parallel to the ground electrode 3, a capacitance is likely to be generated between these two electrodes, whereby the conductor loss of the planar electrodes 5a to 5c tends to increase. However, of the entire length of the conductor line 4, the plane electrodes 5a to 5c
Are adjusted so that the total length of the vertical electrodes 6a to 6c is substantially equal to the total length of the vertical electrodes 6a to 6c. Therefore, the conductor loss generated in the planar electrodes 5a to 5c is:
It does not have a dominant effect on the characteristics of the resonator 1,
Due to such conductor loss, there is no fear that the resistance R in the following equation (1) representing the Q value increases and the Q value decreases.

Q = ωL / R (1) Since the vertical electrodes 6 a to 6 c are arranged perpendicular to the ground electrode 3, a capacitance is generated between the vertical electrodes 6 a to 6 c and the ground electrode 3. Is suppressed. Therefore, the capacitance generated at this portion is very small compared to the capacitance generated between the plane electrodes 5a, 5b and the ground electrode 3, and the conductor loss of the vertical electrodes 6a to 6c affects the characteristics of the resonator 1. There is no fear of giving.

Further, according to the resonator 1, since the conductor line 4 is formed in a substantially meandering shape, the size of the substrate on which the conductor line is provided can be reduced, whereby the size of the resonator can be reduced.

Next, the configuration of a resonator according to a second embodiment of the present invention will be described with reference to FIGS. FIG.
The same reference numerals are given to the same or corresponding portions as the resonator 1 shown in FIG.

2 and 3, reference numeral 11 denotes a resonator.
A substrate 2 is provided. The substrate 2 is formed by laminating a plurality of ceramic sheets, for example, and has ground electrodes 13a, 13a on the middle portion in the thickness direction and on one main surface 2a, respectively.
b is provided. The substrate 2 is connected to the planar electrodes 15a to 15c and the vertical electrodes 16a to 16c, thereby forming a substantially meandering conductor line 14. Of these, the plane electrodes 15a and 15b are provided on the other main surface 2b of the substrate 2, and the plane electrode 15c is provided between the ground electrodes 13a and 13b in the thickness direction of the substrate 2. The vertical electrodes 16a and 16b are connected to the other main surface 2b of the substrate 2.
Holes 17a, 1 that reach between the ground electrodes 13a, 13b from the
7b, and the vertical electrode 16c is formed in a hole 17c penetrating the substrate 2 in the thickness direction. In addition, the vertical electrode 16
a to 16c are insulated from the ground electrode 13a by gaps G1, G2, and G3, respectively.
c is connected to the ground electrode 13b. The resonator 11 thus configured resonates with an inductance component due to the conductor line 14 and a capacitance component generated between the conductor line 14 and the ground electrode 13a.

Here, in the conductor line 14, the length of each electrode is adjusted so that the ratio occupied by the planar electrodes 15a to 15c and the ratio occupied by the vertical electrodes 16a to 16c are substantially equal. . Therefore, the conductor loss generated in the plane electrodes 15a to 15c does not have a dominant effect on the characteristics of the resonator 1, and there is no possibility that the Q value is reduced by such a conductor loss.

In addition, the vertical electrodes 16a to 16c
Is arranged perpendicularly to the ground electrode 13a, the generation of capacitance between the vertical electrodes 16a to 16c and the ground electrode 13a is suppressed. Therefore, the capacitance generated in this portion is caused by the plane electrodes 15a to 15c and the ground electrode 13
Since the capacitance is very small compared to the capacitance generated between the vertical electrodes 16a and 16a, there is no possibility that the conductor loss of the vertical electrodes 16a to 16c affects the characteristics of the resonator 1. Further, according to the resonator 11, since the conductor line 14 is formed in a substantially meandering shape, the size of the substrate on which the conductor line is provided can be reduced, whereby the size of the resonator can be reduced. Next, experimental data on characteristics of the resonator having the configuration of the present embodiment will be shown.

In this experiment, the characteristic impedance of the plane electrode was 20Ω, 30Ω and 40Ω for the conventional resonator having the configuration shown in FIG. 9 and the resonator according to the present invention having the configuration shown in FIGS. In this case, the inductance value and the Q value are compared, and the results are shown in FIGS. 4 to 6, the solid line indicates the Q value of the resonator according to the present invention, and the dotted line indicates the Q value of the conventional resonator. From these figures, it can be seen that the resonator according to the present invention has the conventional Q value. It can be seen that a Q value higher than that of the resonator can be obtained.

Next, a third embodiment according to the present invention will be described with reference to FIGS. The same or corresponding parts as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIGS. 7 and 8, reference numeral 21 denotes a resonator provided with the substrate 2. Ground electrodes 23a and 23b are provided in the middle and one main surface 2a in the thickness direction of the substrate 2, respectively. The substrate 2 has flat electrodes 25a to 25a
d and the vertical electrodes 26a to 26d are connected to each other,
By being integrally formed, a substantially meandering conductor line 24 is formed. Here, the plane electrodes 25a, 25b are provided on the other main surface 2b of the substrate 2, and the plane electrodes 25c, 2b
5d is the ground electrodes 23a, 23 in the thickness direction of the substrate 2.
b. Also, the vertical electrodes 26a to 26c
Are formed on the inner peripheral surfaces of the holes 27a and 27b, each of which opens to the other main surface 2b of the substrate 2 and reaches the middle in the thickness direction.
The vertical electrode 26d is formed on one inner surface 2a of the substrate 2 and formed on the inner peripheral surface of a hole 27d reaching the middle in the thickness direction.
The vertical electrodes 26a to 26c are insulated from the ground electrode 23a by gaps g1 to g3, and the vertical electrode 26d is connected to the ground electrode 23a. The resonator 21 thus configured resonates with an inductance component caused by the conductor line 24 and a capacitance component generated between the conductor line 24 and the ground electrode 23a.

Here, in the conductor line 24, the length dimension of each electrode is adjusted so that the ratio occupied by the plane electrodes 25a to 25d and the ratio occupied by the vertical electrodes 26a to 26d are substantially equal. Therefore, the conductor loss generated in the planar electrodes 25a to 25d does not have a dominant effect on the characteristics of the resonator 21, and there is no possibility that the Q value is reduced by such a conductor loss.

Since the vertical electrodes 26a to 26d are arranged perpendicular to the ground electrode 23a, the vertical electrodes
The generation of capacitance is suppressed between 6a to 26d and the ground electrode 23a. Therefore, the capacitance generated in this portion is very small compared to the capacitance generated between the plane electrodes 25a to 25d and the ground electrode 23a, and the conductor loss of the vertical electrodes 26a to 26d affects the characteristics of the resonator 21. There is no fear of giving.

According to the resonator 21, the conductor line 24
Is formed in a substantially meandering shape, so that the substrate on which the conductor line is provided can be reduced in size, whereby the size of the resonator can be reduced. The numbers of the plane electrodes and the vertical electrodes provided on the substrate are not limited to those shown in the above embodiments.

In each of the above embodiments, the case where the proportion occupied by the plane electrode and the proportion occupied by the vertical electrode in the entire length of the conductor line has been described. However, the proportion is not limited to such a proportion. Absent.

In each of the above embodiments, the case where a vertical electrode is formed by applying a conductor to the inner peripheral surface of a through hole or a hole formed in a substrate has been described. To form a vertical electrode.

[0030]

According to the resonator of the present invention, since the conductor line is constituted by the plurality of plane electrodes and the plurality of vertical electrodes, it is possible to reduce the proportion of the conductor line occupied by the plane electrodes. As a result, the conductor loss occurring in the plane electrode does not have a dominant effect on the characteristics of the resonator, and the Q value is not likely to decrease due to such conductor loss.

Further, according to the resonator of the present invention, since the conductor line is formed in a substantially meandering shape, the size of the substrate on which the conductor line is provided can be reduced, whereby the size of the resonator can be reduced. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a resonator according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a resonator according to a second embodiment of the present invention.

FIG. 3 is a sectional view of the resonator of FIG.

FIG. 4 is a characteristic diagram showing a difference in Q value between the resonator shown in FIG. 2 and a conventional resonator.
It is a characteristic diagram in case of 0 (ohm).

5 is a characteristic diagram showing a difference in Q value between the resonator shown in FIG. 2 and a conventional resonator.
It is a characteristic diagram in case of 0 (ohm).

FIG. 6 is a characteristic diagram showing a difference in Q value between the resonator shown in FIG. 2 and a conventional resonator.
It is a characteristic diagram in case of 0 (ohm).

FIG. 7 is a perspective view showing a resonator according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view of the resonator of FIG.

FIG. 9 is a perspective view showing a conventional resonator.

FIG. 10 is a perspective view showing another conventional resonator.

[Explanation of symbols]

1, 11, 21 resonator 2 substrate 2a one main surface 2b other main surface 3, 13a, 13b, 23a, 23b ground electrode 4, 14, 24 conductor line 5a, 5b, 5c, 15a, 15b, 15c, 25a,
25b, 25c, 25d planar electrodes 6a, 6b, 6c, 16a, 16b, 16c, 26a,
26b, 26c, 26d vertical electrodes 7a, 7b, 7c, 17a, 17b, 17c, 27a,
27b, 27c, 27d holes

Claims (2)

[Claims] 1. A resonator in which a conductor line and a ground electrode are provided on a substrate made of a dielectric material, wherein the conductor line is arranged such that a longitudinal direction thereof is substantially parallel to the ground electrode. By connecting a plurality of planar electrodes and a plurality of vertical electrodes arranged so that the longitudinal direction is substantially perpendicular to the ground electrode, a capacitance between the conductor line and the ground electrode is formed. A resonator characterized in that generation of phenomena is suppressed. 2. The main electrode of the substrate, or the main surface of the substrate and an intermediate part in a thickness direction of the substrate, and the conductor line is a main surface of the substrate or a main surface of the substrate. And a plurality of planar electrodes provided in the middle in the thickness direction, and a plurality of vertical electrodes provided in a plurality of holes formed in the substrate in the thickness direction are connected to each other, thereby exhibiting a substantially meandering shape, The resonator according to claim 1, wherein a conductor line is connected to the ground electrode.