JP6649841B2 - Resonator and dielectric filter - Google Patents

Description

  The present invention relates to a resonator and a dielectric filter, for example, relates to a resonator formed by via holes formed in a dielectric and a dielectric filter formed by multiplying the resonator.

  Conventionally, as a resonator 100, for example, as shown in FIG. 19A, there is a configuration in which a plate-shaped center conductor 106 is formed inside a dielectric substrate 104 around which a shield conductor 102 is formed. This resonator 100 has a problem that the current is concentrated on the end of the center conductor 106 and the Q value is reduced.

  Therefore, conventionally, in order to suppress a decrease in the Q value, as shown in FIG. 19B, an electrode (hereinafter, referred to as a via electrode) formed by a via hole having a circular cross section is formed on a dielectric substrate 104 having a shielding conductor 102 formed therearound. 108 (refer to Patent Document 1).

  Conventionally, two ground electrodes and an input / output electrode are formed on the lower surface of a dielectric substrate, a plate-like internal electrode is formed in a dielectric, and further, between the two ground electrodes and the internal electrode in the dielectric. Via electrodes are respectively formed, and via electrodes are formed between input / output electrodes and internal electrodes (see Patent Document 2).

  Further, conventionally, a ground conductor layer is formed only on the lower surface of the dielectric substrate, and a strip line (inductor component) is formed on the ground conductor layer via a via electrode (ground connection path). (For example, see Patent Document 3).

JP 2002-00913A Japanese Patent No. 4506903 Japanese Patent No. 4988599

  By the way, in the via electrodes described in Patent Documents 1 and 2, by increasing the diameter, the current density can be reduced, and an improvement in the Q value can be expected. However, when the diameter of the via electrode is increased, the distance between the via electrode and the shielding conductor is reduced, and there is a problem that the Q value is reduced. That is, since the distance between the via electrode and the shield conductor is also related to the optimal solution of the Q value, it is necessary to consider the design of the resonator.

  When the diameter of the via electrode is increased, when forming a dielectric filter by forming the resonators in multiple stages, an electric wall is generated between the resonators, which leads to deterioration of the Q value. Therefore, the distance between adjacent resonators is also taken into consideration. There is a need to. In the dielectric filter, an electrode pattern (line) for receiving and supplying power and coupling adjustment is always required. In this case, it is necessary to dispose the electrode pattern between the via electrode and the shield conductor on the side surface. Since the electrode pattern is arranged while preventing the spread of the magnetic field from the via electrode, there is a problem that the Q value is degraded and unnecessary coupling is generated.

  Moreover, when a via electrode having a large diameter is formed on the dielectric substrate, there is a possibility that a structural defect of the dielectric substrate, that is, a crack may be generated. In addition, since the variation in the diameter of the plurality of via electrodes also increases, there is a problem that the impedance of the resonator varies.

  Particularly, in the resonator described in Patent Document 2, in order to solve the problem, an input / output terminal is formed on the lower surface of the dielectric substrate and connected to the via electrode. In this case, it is difficult to form the shielding conductor on the lower surface of the dielectric substrate, and the electromagnetic shield may be insufficient.

  On the other hand, in the resonator described in Patent Document 3, a portion that operates as a TEM wave resonator is limited to a strip line. That is, the via electrode has only a function of connecting the strip line to the ground conductor layer arranged in parallel.

  The present invention has been made in view of such a problem, and can achieve a distribution of a current density without increasing the size of a via electrode, and furthermore, a magnetic field from a via electrode that functions as a resonator. A variety of electrode patterns can be formed without hindering the spread, and the resonance can suppress the deterioration of the Q value, suppress unnecessary coupling, suppress the deterioration of the electromagnetic shield, improve the design flexibility, and reduce the manufacturing cost. It is an object to provide a filter and a dielectric filter.

[1] The resonator according to the first aspect of the present invention has the following features. A dielectric substrate having a shield conductor formed on at least one main surface, a first input / output terminal formed on a first side surface, and a second input / output terminal formed on a second side surface opposite to the first side surface; A strip line formed in the dielectric substrate, a first via electrode portion and a second via electrode portion formed in the dielectric substrate and formed adjacent from the strip line to the shielding conductor; Having.

  Further, among the side surfaces of the dielectric substrate, shielding conductors are respectively formed on a third side surface facing the first via electrode portion and a fourth side surface facing the second via electrode portion, and the first via electrode The part is composed of a plurality of first via electrodes, and the second via electrode part is composed of a plurality of second via electrodes.

  Further, there is no other via electrode portion between the first via electrode portion and the second via electrode portion, and the plurality of first via electrodes are imaginary first curved lines when viewed from above. And the plurality of second via electrodes are arranged along a virtual second curved line when viewed from above.

  As a result, first, among the side surfaces of the dielectric substrate, the shielding conductors are formed on the third side surface facing the first via electrode portion and the fourth side surface facing the second via electrode portion, respectively. The portion and the second via electrode portion operate as a TEM wave resonator together with the shield conductor on the side surface. That is, the first via electrode unit and the second via electrode unit operate as a TEM wave resonator with reference to the shield conductor on the side surface. Then, the magnetic field spreads from the first via electrode portion and the second via electrode portion toward the opposing shield conductor, and a region where the electromagnetic field is reduced is formed between the first via electrode portion and the second via electrode portion. You.

  Conventionally, between the via electrode and the shield conductor on the side surface, a pattern (line) for receiving and supplying power and adjusting coupling has been arranged while preventing the spread of a magnetic field from the via electrode. As a result, deterioration of the Q value and unnecessary coupling have occurred.

  However, in the first aspect of the present invention, a pattern (line) for receiving and supplying power and adjusting the coupling is formed between the above-mentioned region where the electromagnetic field is sparse, that is, between the first via electrode portion and the second via electrode portion. Since it can be formed, deterioration of the Q value can be suppressed, and unnecessary coupling can be suppressed.

  As described above, the current density can be dispersed without increasing the size of the via electrode, and various electrode patterns can be formed without hindering the spread of the magnetic field from the via electrode. It is possible to achieve suppression, suppression of unnecessary coupling, suppression of deterioration of the electromagnetic shield, improvement of design flexibility, and reduction of manufacturing cost.

[2] In the first aspect of the invention, the first curved line and the second curved line may form a part of one elliptical contour line or a part of one track-shaped contour line. .

  Thereby, the first via electrode portion and the second via electrode portion are part of one elliptical contour or one part of one track-shaped contour, that is, each end on the long axis of the ellipse or the track. Part will be formed. This portion is also where the current is concentrated due to the skin effect of the high-frequency current. That is, current flows intensively in the first via electrode portion and the second via electrode portion. Therefore, it is not necessary to arrange another via electrode portion between the first via electrode portion and the second via electrode portion.

[3] In the first aspect of the present invention, the first via electrode portion forms a first λ / 4 resonator together with the strip line, and the second via electrode portion forms a second λ / 4 resonator together with the strip line. A resonator may be configured. As a result, an in-phase current always flows through the first λ / 4 resonator and the second λ / 4 resonator. By being in phase, when viewed from the resonator alone, the electromagnetic field is sparse between the first via electrode portion and the second via electrode portion, and electrodes for coupling and routing are arranged between them. However, unnecessary coupling can be suppressed as much as possible. As a result, the effect of preventing the deterioration of the Q value and suppressing the variation is exhibited.

[4] In the first invention, another strip line may be formed between the first via electrode portion and the second via electrode portion. As described above, a region where the electromagnetic field is weakened is formed between the first via electrode portion and the second via electrode portion. As a result, it becomes possible to form another strip line, for example, a pattern (line) for receiving and supplying power and adjusting the coupling between the first via electrode portion and the second via electrode portion, thereby deteriorating the Q value. Can be suppressed, and unnecessary coupling can be suppressed.

[5] The dielectric filter according to the second aspect of the present invention has the following features. A dielectric substrate having a shield conductor formed on at least one main surface, a first input / output terminal formed on a first side surface, and a second input / output terminal formed on a second side surface opposite to the first side surface; , At least two resonator bodies formed in the dielectric substrate.

  Each of the resonator main bodies has a strip line, and a first via electrode portion and a second via electrode portion formed adjacent to each other from the strip line to the shielding conductor.

  Further, among the side surfaces of the dielectric substrate, shielding conductors are respectively formed on a third side surface facing the first via electrode portion and a fourth side surface facing the second via electrode portion, and the first via electrode The part is composed of a plurality of first via electrodes, and the second via electrode part is composed of a plurality of second via electrodes.

  Further, there is no other via electrode portion between the first via electrode portion and the second via electrode portion, and the plurality of first via electrodes are imaginary first curved lines when viewed from above. The plurality of second via electrodes are arranged along a virtual second curved line when viewed from above, and one of the resonator main bodies and the other of the resonator main bodies are coupled to each other. ing.

  Thus, the current density can be dispersed without increasing the size of the via electrode, and various electrode patterns can be formed without hindering the spread of the magnetic field from the via electrode, thereby suppressing the deterioration of the Q value. In addition, it is possible to suppress unnecessary coupling, suppress reduction in electromagnetic shield, improve design flexibility, and reduce manufacturing cost.

[6] In the second aspect of the invention, one of the resonators and the other of the resonators may be electromagnetically coupled. A strip line for capacitively coupling the resonators is formed by using the above-mentioned electromagnetic field sparse region in one resonator and the above-described electromagnetic field sparse region in the other resonator. can do. That is, it is possible to electromagnetically couple one of the resonators and the other resonator while suppressing deterioration of the Q value and suppressing unnecessary coupling.

[7] In the second invention, one of the resonators and the other of the resonators may be directly connected by a strip line. In this case, a region between the one resonator and the other resonator is used by utilizing a region where the above-described electromagnetic field is sparse in one resonator and a region where the above-described electromagnetic field is sparse in the other resonator. A pattern (line) for adjusting the coupling can be formed.

[8] In the second aspect of the invention, one of the resonators and the other resonator may be magnetically coupled. In this case as well, one resonator and the other resonator are utilized by utilizing the above-described electromagnetic field sparse region in one resonator and the above-described electromagnetic field sparse region in the other resonator. A pattern (line) for adjusting the coupling between them can be formed.

  As described above, according to the resonator and the dielectric filter according to the present invention, the current density can be dispersed without increasing the size of the via electrode, and the spread of the magnetic field from the via electrode can be reduced. Various electrode patterns can be formed without hindrance, and it is possible to suppress deterioration of the Q value, suppress unnecessary coupling, suppress deterioration of the electromagnetic shield, improve design flexibility, and reduce manufacturing costs.

FIG. 3 is a perspective view showing the resonator according to the present embodiment. FIG. 3 is a perspective view showing the resonator according to the present embodiment. 3A is a cross-sectional view taken along the line IIIA-IIIA in FIG. 1, and FIG. 3B is a cross-sectional view taken along the line IIIB-IIIB in FIG. It is explanatory drawing which shows the arrangement | sequence state of the some 1st small diameter via electrode which comprises a 1st via electrode part, and the arrangement | sequence state of the some 2nd small diameter via electrode which comprises a 2nd via electrode part. FIG. 5A is an explanatory diagram showing a problem in the case of a via electrode having a circular cross section, and FIG. 5B is an explanatory diagram showing advantages of a via electrode having an elliptical cross section. FIG. 6A is an explanatory diagram showing an example in which an elliptical via electrode is constituted by a plurality of small-diameter via electrodes. FIG. 6B is an example in which small-diameter via electrodes are arranged only in a portion where current is concentrated in the elliptical via electrode. FIG. FIG. 7A is an explanatory diagram showing a problem of the elliptical via electrode, and FIG. 7B is an explanatory diagram showing a problem when the elliptical via electrode is constituted by a plurality of small-diameter via electrodes. FIG. 9 is an explanatory view showing an advantage of a case where small-diameter via electrodes are arranged only in a portion where a current is concentrated in an elliptical via electrode. FIG. 9A is an equivalent circuit diagram illustrating the resonator according to the present embodiment, and FIG. 9B is an explanatory diagram illustrating a current flow in the resonator. It is sectional drawing which shows the resonator which concerns on a modification. FIG. 2 is a perspective view illustrating a configuration of a dielectric filter (first dielectric filter) according to the first embodiment. It is sectional drawing on the XII-XII line in FIG. However, the hatching of the cross section of the dielectric substrate is omitted. It is a perspective view showing the composition of the modification of a 1st dielectric filter. FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 13. However, the hatching of the cross section of the dielectric substrate is omitted. FIG. 3 is an equivalent circuit diagram illustrating a first dielectric filter. It is a perspective view showing the composition of the dielectric filter (the 2nd dielectric filter) concerning a 2nd embodiment. It is sectional drawing on the XVII-XVII line in FIG. However, the hatching of the cross section of the dielectric substrate is omitted. FIG. 9 is an equivalent circuit diagram illustrating a second dielectric filter. FIG. 19A is a cross-sectional view illustrating an example of a conventional resonator, and FIG. 19B is a cross-sectional view illustrating another example of a conventional resonator. However, the hatching of the cross section of the dielectric substrate is omitted.

  Hereinafter, embodiments of a resonator and a dielectric filter according to the present invention will be described with reference to FIGS.

  First, the resonator 10 according to the present embodiment includes a dielectric substrate 14 having at least upper and lower shielding conductors 12U and 12B, respectively, as shown in FIGS. 1, 2, 3A and 3B. A strip line 16 formed in the dielectric substrate 14 and facing the upper shield conductor 12U; and a first strip line formed in the dielectric substrate 14 and formed adjacent to the strip line 16 and the lower shield conductor 12B. It has a via electrode portion 18A and a second via electrode portion 18B. The first via electrode portion 18A and the second via electrode portion 18B are formed by via holes formed in the dielectric substrate 14.

  The dielectric substrate 14 is formed by laminating a plurality of dielectric layers, and has a rectangular parallelepiped shape, for example, as shown in FIG. Of the four side surfaces of the dielectric substrate 14, a first input / output terminal 20A is formed on a first side surface 14a, and a second input / output terminal 20B is formed on a second side surface 14b facing the first side surface 14a. Further, shielding conductors 12a and 12b are formed on the third side surface 14c and the fourth side surface 14d facing the third side surface 14c, respectively. In the dielectric substrate 14, the first via electrode portion 18A faces the third side surface 14c, and the second via electrode portion 18B faces the fourth side surface 14d.

  As shown in FIGS. 2, 3A, and 3B, the first via electrode portion 18A includes a plurality of small-diameter first via electrodes (hereinafter, referred to as first small-diameter via electrodes 22a). Reference numeral 18B includes a plurality of small-diameter second via electrodes (hereinafter, referred to as second small-diameter via electrodes 22b). No other via electrode portion exists between the first via electrode portion 18A and the second via electrode portion 18B.

  Furthermore, in the present embodiment, the first input / output line 24A extending between the first via electrode portion 18A and the second via electrode portion 18B and extending from below the strip line 16 to the first input / output terminal 20A. And a second input / output line 24B extending from below the strip line 16 to the second input / output terminal 20B.

  Thereby, first, the first via electrode portion 18A and the second via electrode portion 18B of the resonator 10 operate as a TEM wave resonator together with the shield conductors 12a to 12d on the side surfaces. That is, the first via electrode portion 18A and the second via electrode portion 18B operate as a TEM wave resonator with reference to the shield conductors 12a to 12d on the side surfaces. The strip line 16 operates as a function of forming an open-end capacitance. This is because the structure of the resonator described in Patent Literature 3, that is, the portion that operates as a TEM wave resonator is limited to the strip line, and the via electrode connects the strip line to the ground conductor layer arranged in parallel. It is clearly different from the structure of a resonator which only has a function.

  Further, in the present embodiment, as shown in FIG. 4, the plurality of first small-diameter via electrodes 22a are arranged along a virtual first curved line 26a (a portion where high-frequency current is concentrated) when viewed from above. The plurality of second small-diameter via electrodes 22b are arranged along a virtual second curved line 26b (a portion where high-frequency current is concentrated) when viewed from above. The first curved line 26a and the second curved line 26b constitute a part of one elliptical contour line or a part of one track-shaped contour line.

  Here, the relationship between the first via electrode portion 18A and the second via electrode portion 18B and one ellipse will be described with reference to FIGS. 5A to 7B.

  As shown in FIG. 5A, when the diameter of via electrode 108 having a circular cross section is increased, electric wall 112 is generated between resonators 100 when dielectric filter 110 is configured by forming resonators 100 in multiple stages. This leads to deterioration of the Q value.

  Therefore, as shown in FIG. 5B, in the case where the via electrode 114 has an elliptical cross-sectional shape, the dielectric filter 110 is configured by multiplying the resonator 100 in the minor axis direction. However, since the distance between the via electrodes 114 is longer than that of the circular via electrode 108, the Q value is improved.

  Furthermore, as shown in FIG. 6A, when the elliptical via electrode 114 is configured by a plurality of small-diameter via electrodes (hereinafter, referred to as small-diameter via electrodes 22), the magnetic field envelope 118 is a large-diameter via electrode. Behave as if. Even if the diameters of the individual small-diameter via electrodes 22 vary by a certain ratio, the influence on the envelope 118 (large-diameter via electrode) is less than that ratio, so that a variation reduction effect can also be obtained.

  By the way, for example, in the elliptical via electrode 114 shown in FIG. 6A, the high-frequency current is concentrated at the end of the ellipse and both ends having a large curvature. Therefore, as shown in FIG. 6B, among the plurality of small-diameter via electrodes 22 forming the elliptical via electrode 114, a plurality of small-diameter via electrodes 22 located at both ends of the elliptical shape along the virtual first curved line 26 a having a large curvature are provided. The first small-diameter via electrode 22a and the plurality of second small-diameter via electrodes 22b along the imaginary second curved line 26b having a large curvature are left, and the plurality of small-diameter via electrodes 22 located at the center can be removed.

  That is, the plurality of first small diameter via electrodes 22a constituting the first via electrode portion 18A are arranged along the virtual first curved line 26a, and the plurality of second small diameter via electrodes 22b constituting the second via electrode portion 18B. Are arranged along the virtual second curved line 26b.

  In addition, as shown in FIG. 7A, when a via electrode 114 having an elliptical cross-sectional shape is formed, or as shown in FIG. The magnetic field 28 spreads from the electrode 114 toward the opposing shield conductor 102. However, when the dielectric filter 110 is configured by forming the resonator 100 in multiple stages, it is necessary to arrange a pattern 116 (line) for power supply / reception and coupling adjustment. A pattern 116 (line) for receiving and supplying power and adjusting the coupling must be arranged between the conductor 102 and the conductor 102 while preventing the spread of the magnetic field 28 from the via electrode 114. This results in deterioration of the Q value and generation of unnecessary coupling.

  On the other hand, in the present embodiment, as shown in FIG. 6B, a plurality of first small-diameter via electrodes 22a constituting the first via electrode portion 18A are arranged along the virtual first curved line 26a, and the second via electrode Since the plurality of second small-diameter via electrodes 22b constituting the portion 18B are arranged along the virtual second curved line 26b, as shown in FIG. 8, the first via electrode portion 18A and the second via electrode portion 18B respectively The magnetic field 28 spreads toward the opposing shield conductors 12a and 12b, and a region 30 where the electromagnetic field is reduced is formed between the first via electrode portion 18A and the second via electrode portion 18B.

  Therefore, the pattern 32 (line) for receiving and supplying power and adjusting the coupling is formed in the region 30 where the electromagnetic field is sparse, that is, between the first via electrode portion 18A and the second via electrode portion 18B. Becomes possible. As a result, deterioration of the Q value can be suppressed, and unnecessary coupling can be suppressed.

  In addition, unlike the elliptical via electrode 114 shown in FIG. 7A and the plurality of small diameter via electrodes 22 shown in FIG. 7B, as shown in FIG. 8, the small diameter via electrodes 22 (22a, 22b ), The amount of metal material (for example, silver) constituting the small-diameter via electrode 22 (22a, 22b) can be significantly reduced, and the number of small-diameter via electrodes 22 (22a, 22b) is reduced. Therefore, the number of steps can be reduced.

  As described above, in the resonator 10 according to the present embodiment, the current density can be dispersed without increasing the size of the via electrode, and the spread of the magnetic field from the via electrode can be prevented. Various electrode patterns can be formed, and it is possible to suppress deterioration of the Q value, suppress unnecessary coupling, suppress deterioration of the electromagnetic shield, improve design flexibility, and reduce manufacturing costs.

  9A and 9B show an equivalent circuit of the resonator 10 according to the present embodiment. As shown in FIG. 9A, a first λ / 4 resonator 34A is formed from the first via electrode portion 18A to the input / output portion (I / O) of the strip line 16, and the input of the strip line 16 from the second via electrode portion 18B. A second [lambda] / 4 resonator 34B is formed over the output portion (I / O). As a result, as shown in FIG. 9B, the in-phase current i always flows through the first λ / 4 resonator 34A and the second λ / 4 resonator 34B. By having the same phase, when viewed in the resonator 10 alone, the electromagnetic field between the first via electrode portion 18A and the second via electrode portion 18B is in a sparse state, and an electrode for coupling and leading is provided therebetween. However, unnecessary coupling can be suppressed as much as possible. As a result, deterioration of the Q value can be prevented, and variation in characteristics can be suppressed.

  In the above-described example, the strip line 16 faces the upper shielding conductor 12U, and the first small-diameter via electrode 22a forming the first via electrode portion 18A and the second small-diameter via electrode 22b forming the second via electrode portion 18B are formed. Each is connected to the lower shielding conductor 12B, but in addition, like the resonator 10a according to the modification shown in FIG. 10, the strip line 16 is opposed to the lower shielding conductor 12B, and the first small-diameter via electrode 22a The second small-diameter via electrode 22b may be connected to the upper shielding conductor 12U.

  Next, a dielectric filter (hereinafter, referred to as a first dielectric filter 50A) according to the first embodiment will be described with reference to FIGS. The description of the same members as those of the above-described resonator 10 will not be repeated.

  FIGS. 11 and 12 show an example in which the resonator 10 is multi-staged and the first dielectric filter 50A is configured by three resonators 10. FIG.

  That is, the first dielectric filter 50A has three resonator main bodies (first resonator main body 52A to third resonator main body 52C) in the dielectric substrate 14.

  The first resonator body 52A (resonator 10) to the third resonator body 52C (resonator 10) are adjacent to the strip line 16 facing the upper shield conductor 12U and the strip line 16 to the lower shield conductor 12B, respectively. A first via electrode portion 18A and a second via electrode portion 18B are formed. The first via electrode portion 18A includes a plurality of first small diameter via electrodes 22a, and the second via electrode portion 18B includes a plurality of second small diameter via electrodes 22b.

  In particular, the first dielectric filter 50A has the following configuration. That is, the first connection line 54A that electrically connects the strip line 16 and the first input / output terminal 20A is formed between the strip line 16 and the first input / output terminal 20A of the first resonator main body 52A. I have. A capacitive first coupling adjustment line 56A extending from the strip line 16 of the second resonator main body 52B toward the first resonator main body 52A is formed. The end of the first coupling adjustment line 56A is located between the first via electrode portion 18A and the second via electrode portion 18B of the first resonator main body 52A and below the strip line 16. I have.

  Similarly, a second connection line 54B that electrically connects the strip line 16 and the second input / output terminal 20B is formed between the strip line 16 and the second input / output terminal 20B of the third resonator body 52C. ing. A capacitive second coupling adjustment line 56B extending from the strip line 16 of the second resonator body 52B toward the second input / output terminal 20B is formed. The end of the second coupling adjustment line 56B is located between the first via electrode portion 18A and the second via electrode portion 18B of the third resonator body 52C and below the strip line 16. I have.

  FIGS. 13 and 14 show a dielectric filter 50Aa according to a modification of the first dielectric filter 50A. The dielectric filter 50Aa according to this modification has substantially the same configuration as the above-described first dielectric filter 50A, as shown in FIGS. 13 and 14, but includes a first resonator main body 52A and a second resonator main body 52A. The strip lines 16 of 52B are directly connected by the third connection line 54C, and the strip lines 16 of the second resonator body 52B and the third resonator body 52C are directly connected by the fourth connection line 54D. I have.

  Further, a capacitive third coupling adjustment line 56C is formed from a position below the strip line 16 of the first resonator main body 52A to a position below the strip line 16 of the second resonator main body 52B, and the second resonator main body is formed. A capacitive fourth coupling adjustment line 56D is formed from a position below the strip line 16 of 52B to a position below the strip line 16 of the third resonator body 52C.

  FIG. 15 shows an equivalent circuit of the first dielectric filter 50A and a dielectric filter 50Aa according to a modified example thereof. As shown in FIG. 15, the first dielectric filter 50A and the dielectric filter 50Aa according to the modified example are configured such that the first resonator main body 52A and the second resonator main body 52B are electromagnetically coupled, and the second resonator main body 52B is formed. And the third resonator body 52C are electromagnetically coupled.

  In the first resonator body 52A to the third resonator body 52C, the first via electrode portion 18A and the strip line 16 constitute a first λ / 4 resonator 34A, and the second via electrode portion 18B Together with the line 16, a second λ / 4 resonator 34B is formed.

  Since the first dielectric filter 50A is configured by multiplying the resonator 10 according to the present embodiment described above, the current density can be dispersed without increasing the size of the via electrode. Various electrode patterns can be formed without hindering the spread of the magnetic field from the electrodes, suppressing the deterioration of the Q value, suppressing unnecessary coupling, suppressing the reduction of the electromagnetic shield, improving the design flexibility, and reducing the manufacturing cost. Can be planned.

  In particular, the first coupling adjustment line 56A to the fourth coupling adjustment line 56D are utilized by using the region 30 in the first resonator main body 52A, the second resonator main body 52B, and the third resonator main body 52C where the electromagnetic field is sparse. The electromagnetic field coupling between the first resonator main body 52A and the second resonator main body 52B and its adjustment, and the electromagnetic field coupling between the second resonator main body 52B and the third resonator main body 52C and its Adjustment can be easily performed.

  That is, in the first dielectric filter 50A and the dielectric filter 50Aa according to the modification, the first resonator body 52A and the second resonator body 52B are electromagnetically coupled, and the second resonator body 52B and the third resonator And the container main body 52C are electromagnetically coupled. Therefore, in the first dielectric filter 50A, adjustment of the capacitive coupling between the first resonator main body 52A and the second resonator main body 52B is facilitated by the first coupling adjustment line 56A, and the second coupling adjustment line 56B is used to adjust the second coupling adjustment line 56B. Adjustment of capacitive coupling between the resonator main body 52B and the third resonator main body 52C is facilitated. Similarly, in the dielectric filter 50Aa according to the modification, the third coupling adjustment line 56C facilitates the adjustment of the capacitive coupling between the first resonator main body 52A and the second resonator main body 52B, and the fourth coupling adjustment line 56D This facilitates adjustment of the capacitive coupling between the second resonator main body 52B and the third resonator main body 52C.

  On the other hand, with respect to the adjustment of the inductive coupling, in the first dielectric filter 50A, the distance between the first resonator main body 52A and the second resonator main body 52B is changed, or the second resonator main body 52B and the third resonator main body 52B are connected. By changing the distance between 52C, it is easy to adjust the inductive coupling between the first resonator main body 52A and the second resonator main body 52B and the inductive coupling between the second resonator main body 52B and the third resonator main body 52C. become. In the dielectric filter 50Aa according to the modification, the distance between the first resonator main body 52A and the second resonator main body 52B is changed, or the distance between the second resonator main body 52B and the third resonator main body 52C is changed. In addition to the method, by changing the connection position of the third connection line 54C or changing the connection position of the fourth connection line 54D, inductive coupling between the first resonator main body 52A and the second resonator main body 52B, and The adjustment of the inductive coupling between the second resonator main body 52B and the third resonator main body 52C is facilitated.

  Next, a dielectric filter according to a second embodiment (hereinafter, referred to as a second dielectric filter 50B) will be described with reference to FIGS.

  16 and 17 show an example in which the resonator 10 is multi-staged and the second dielectric filter 50B is configured by four resonators 10.

  That is, the second dielectric filter 50B has four resonator main bodies (first resonator main body 52A to fourth resonator main body 52D) in the dielectric substrate 14.

  The first resonator main body 52A to the fourth resonator main body 52D are respectively formed with a strip line 16 facing the upper shield conductor 12U and a first via electrode portion formed adjacently from the strip line 16 to the lower shield conductor 12B. 18A and a second via electrode portion 18B. The first via electrode portion 18A includes a plurality of first small diameter via electrodes 22a, and the second via electrode portion 18B includes a plurality of second small diameter via electrodes 22b.

  In particular, the second dielectric filter 50B has the following configuration. That is, the first connection line 54A that electrically connects the strip line 16 and the first input / output terminal 20A is formed between the strip line 16 and the first input / output terminal 20A of the first resonator main body 52A. I have. A capacitive fifth coupling adjustment line 56E extending from the strip line 16 of the second resonator body 52B toward the first input / output terminal 20A is formed. The end of the fifth coupling adjustment line 56E is located between the first via electrode portion 18A and the second via electrode portion 18B of the first resonator main body 52A and below the strip line 16. I have.

  Similarly, a second connection line 54B that electrically connects the strip line 16 and the second input / output terminal 20B is formed between the strip line 16 of the fourth resonator body 52D and the second input / output terminal 20B. ing. A capacitive sixth coupling adjustment line 56F extending from the strip line 16 of the third resonator body 52C toward the second input / output terminal 20B is formed. The end of the sixth coupling adjustment line 56F is located between the first via electrode portion 18A and the second via electrode portion 18B of the fourth resonator body 52D and is located below the strip line 16. I have.

  Further, a capacitive seventh coupling adjustment line 56G is formed between the second resonator main body 52B and the third resonator main body 52C that are magnetically coupled. One end of the seventh coupling adjustment line 56G is located between the first via electrode portion 18A and the second via electrode portion 18B of the second resonator body 52B and below the strip line 16. ing. The other end of the seventh coupling adjustment line 56G is located between the first via electrode portion 18A and the second via electrode portion 18B of the third resonator body 52C and below the strip line 16. ing.

  FIG. 18 shows an equivalent circuit of the second dielectric filter 50B. As shown in FIG. 18, in the second dielectric filter 50B, the first resonator main body 52A and the second resonator main body 52B are electromagnetically coupled, and the second resonator main body 52B and the third resonator main body 52C are connected to each other. The third resonator body 52C and the fourth resonator body 52D are electromagnetically coupled, and are configured by electromagnetic field coupling.

  Similarly to the first dielectric filter 50A, also in the fourth resonator body 52D, the first via electrode portion 18A and the strip line 16 constitute a first λ / 4 resonator 34A, and the second via electrode portion 18B constitutes a second λ / 4 resonator 34B together with the strip line 16.

  The second dielectric filter 50B has the same configuration as the first dielectric filter 50A because the resonator 10 according to the present embodiment described above is configured in multiple stages. In addition, various electrode patterns can be formed in the region 30 where the electromagnetic field is sparse, that is, between the first via electrode portion 18A and the second via electrode portion 18B. It is possible to improve the design flexibility and reduce the manufacturing cost.

  Also in the second dielectric filter 50B, similarly to the above-described first dielectric filter 50A and the dielectric filter 50Aa according to the modification, the electromagnetic fields in the first resonator main body 52A to the fourth resonator main body 52D are sparse. The fifth coupling adjustment line 56 </ b> E to the seventh coupling adjustment line 56 </ b> G can be formed by using the changed region 30, and electromagnetic field coupling between the first resonator main body 52 </ b> A and the second resonator main body 52 </ b> B and adjustment thereof Electromagnetic field coupling between the second resonator body 52B and the third resonator body 52C and its adjustment, and electromagnetic field coupling between the third resonator body 52C and the fourth resonator body 52D and its adjustment are easily performed. Can be.

  That is, in the second dielectric filter 50B, the first resonator body 52A and the second resonator body 52B are electromagnetically coupled, the second resonator body 52B and the third resonator body 52C are electromagnetically coupled, The third resonator body 52C and the fourth resonator body 52D are electromagnetically coupled. Therefore, adjustment of the capacitive coupling between the first resonator main body 52A and the second resonator main body 52B is facilitated by the fifth coupling adjustment line 56E, and the fourth resonator 52C and the fourth resonance main body 52C are adjusted by the sixth coupling adjustment line 56F. Adjustment of capacitive coupling between the resonator main bodies 52D is facilitated, and adjustment of capacitive coupling between the second resonator main body 52B and the third resonator main body 52C is facilitated by the seventh coupling adjustment line 56G.

  On the other hand, regarding the adjustment of the inductive coupling, the distance between the first resonator main body 52A and the second resonator main body 52B is changed, or the distance between the second resonator main body 52B and the third resonator main body 52C is changed. By changing the distance between the third resonator body 52C and the fourth resonator body 52D, adjustment of the inductive coupling between the first resonator body 52A and the second resonator body 52B, and the Adjustment of the inductive coupling between the third resonator main body 52C and adjustment of the inductive coupling between the third resonator main body 52C and the fourth resonator main body 52D are facilitated.

  Of course, similarly to the dielectric filter 50Aa according to the above-described modified example, adjacent resonator bodies (for example, the second resonator body 52B and the third resonator body 52C) are directly connected by a connection line, and the connection lines are connected. Changing the position facilitates adjustment of the inductive coupling between the resonator bodies.

  In addition, the resonator and the dielectric filter according to the present invention are not limited to the above-described embodiment, but can adopt various configurations without departing from the gist of the present invention.

  That is, in the above-described example, an example in which three resonator bodies or four resonator bodies are provided has been described. Alternatively, two resonator bodies or five or more resonator bodies may be provided. Further, although an example in which three first small-diameter via electrodes 22a and two second small-diameter via electrodes 22b are arranged has been described, the present invention is not limited to this, and two, four or more may be arranged.

DESCRIPTION OF SYMBOLS 10 ... Resonator 12U ... Upper shielding conductor 12B ... Lower shielding conductor 12a, 12b ... Shielding conductor 14 ... Dielectric substrate 16 ... Strip line 18A ... 1st via electrode part 18B ... 2nd via electrode part 20A ... 1st input Output terminal 20B Second input / output terminal 22 Small via electrode 22a First small via electrode 22b Second small via electrode 24A First input / output line 24B Second input / output line 26a First curved line 26b Second curved line 28 Magnetic field 30 Area where electromagnetic field is sparse 32 Pattern 34A First λ / 4 resonator 34B Second λ / 4 resonator 50A First dielectric filter 50Aa Dielectric filter (deformation) Example)
50B second dielectric filters 52A to 52D first resonator body to fourth resonator body 54A to 54D first connection line to fourth connection line 56A to 56G first coupling adjustment line to seventh coupling adjustment line

Claims (8)

A dielectric substrate having a shielding conductor formed on at least one main surface, a first input / output terminal formed on a first side surface, and a second input / output terminal formed on a second side surface opposite to the first side surface;
A strip line formed in the dielectric substrate;
A first via electrode portion and a second via electrode portion formed in the dielectric substrate and adjacently formed from the strip line to the shielding conductor;
Among the side surfaces of the dielectric substrate, shielding conductors are respectively formed on a third side surface facing the first via electrode portion and a fourth side surface facing the second via electrode portion,
The first via electrode unit includes a plurality of first via electrodes,
The second via electrode unit includes a plurality of second via electrodes,
No other via electrode portion exists between the first via electrode portion and the second via electrode portion,
The plurality of first via electrodes are arranged along a virtual first curved line when viewed from above,
The resonator, wherein the plurality of second via electrodes are arranged along a virtual second curved line when viewed from above. The resonator according to claim 1,
The resonator according to claim 1, wherein the first curved line and the second curved line form a part of one elliptical outline or a part of one track-shaped outline. The resonator according to claim 1 or 2,
The first via electrode unit forms a first λ / 4 resonator together with the strip line,
The resonator according to claim 2, wherein the second via electrode portion forms a second λ / 4 resonator together with the strip line. The resonator according to any one of claims 1 to 3,
A resonator, wherein another strip line is formed between the first via electrode portion and the second via electrode portion. A dielectric substrate having a shielding conductor formed on at least one main surface, a first input / output terminal formed on a first side surface, and a second input / output terminal formed on a second side surface opposite to the first side surface;
And at least two resonator bodies formed in the dielectric substrate,
Each said resonator body,
Strip line,
A first via electrode portion and a second via electrode portion formed adjacent to each other from the strip line to the shielding conductor;
Among the side surfaces of the dielectric substrate, shielding conductors are respectively formed on a third side surface facing the first via electrode portion and a fourth side surface facing the second via electrode portion,
The first via electrode unit includes a plurality of first via electrodes,
The second via electrode unit includes a plurality of second via electrodes,
No other via electrode portion exists between the first via electrode portion and the second via electrode portion,
The plurality of first via electrodes are arranged along a virtual first curved line when viewed from above,
The plurality of second via electrodes are arranged along a virtual second curved line when viewed from above,
A dielectric filter, wherein one of the resonator main bodies is coupled to the other of the resonator main bodies. The dielectric filter according to claim 5,
A dielectric filter, wherein one resonator and the other resonator are electromagnetically coupled. The dielectric filter according to claim 5,
A dielectric filter, wherein one resonator and the other resonator are directly connected by a strip line. The dielectric filter according to claim 5,
A dielectric filter, wherein one resonator and the other resonator are magnetically coupled.

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