JP2846744B2 - Dielectric resonator and dielectric filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator and a dielectric filter.

[0002]

2. Description of the Related Art Conventionally, as a dielectric filter using a dielectric coaxial resonator, for example, one disclosed in Japanese Utility Model Publication No. Sho 62-44566 (H01P 1/205) is known.

[0003] This type of dielectric filter is formed by providing a through hole in a dielectric member and coating an outer peripheral surface of the dielectric member and an inner peripheral surface of the through hole with a conductive member (for example, silver). The single-sided short-circuit type coaxial resonator is connected to a dielectric substrate, and each coaxial resonator is capacitively coupled by an electrode formed on the dielectric substrate.

[0004]

In recent years, in the field of mobile communication, the weight and volume of devices have been reduced, and accordingly, there has been a demand for miniaturization of dielectric filters.

When the size of the dielectric filter is reduced, the ratio of the inner coaxial diameter to the outer coaxial diameter must be 3.6 in order to obtain a high Qu (Q value at no load). When the outer coaxial diameter is 4 mm or less, the inner coaxial diameter is 1.2 mm or less, and an external connection member is inserted into the through hole of the coaxial resonator as disclosed in Japanese Utility Model Publication No. 62-44566. It is difficult to connect to an external circuit.

When a filter is composed of three or more stages of coaxial resonators, the length of the middle stage coaxial resonator is longer than that of the first stage and last stage coaxial resonators in order to make the resonance frequency of each resonator different. Increase the size. Therefore, there is a problem that coaxial resonators of various lengths are required.

On the other hand, as a method of improving the selection characteristics of a filter, there is a method of forming a pole in an attenuation region. For example, JP-A-62-77703 (H01P 1/205)
In the dielectric filter disclosed in Japanese Patent Application Laid-Open No. H11-207, such a pole is formed by skipping at least one resonator and directly connecting the resonators with a reactance element.

However, this configuration has a problem that the number of parts increases and assembly becomes complicated.

[0009]

According to a first aspect of the present invention, there is provided a dielectric resonator comprising a dielectric member having a through-hole, and an outer conductor and an inner conductor which are covered by a conductive member. And a coaxial resonator body in which an inner conductor is formed, and a short-circuit conductor is formed by coating only one of the through-hole opening end faces of the dielectric member with a conductive member. A concave portion in which a part of the outer conductor connected to the open end surface opposite to the short-circuit conductor forming end surface is removed together with the underlying dielectric member, and the concave portion is provided with an external connection electrode. The substrate is fitted, and the external connection electrode is formed by arranging a conductive member on a surface of the dielectric substrate facing the dielectric member along a penetrating direction of the through hole. The recess formed in the container body and the dielectric Between the plate, it is characterized in that the dielectric member having a viscosity or elasticity is disposed.

In a dielectric filter according to a second aspect of the present invention, an outer conductor and an inner conductor are formed by coating a conductive member on an outer peripheral surface and an inner peripheral surface of a dielectric member having a through hole, And a plurality of coaxial resonators in which a short-circuit conductor is formed by coating only one of the through-hole opening end surfaces of the dielectric member with a conductive member, wherein the plurality of coaxial resonators have the short-circuit conductor The formed short-circuit end face is aligned on one surface, and the open end face on the opposite side of the short-circuit end face is aligned on one face and arranged adjacent to each other. The removed concave portion is formed together with the underlying dielectric member, the concave portions of the adjacent coaxial resonators are connected to each other, and a dielectric substrate having an external connection electrode formed therein is fitted into the connected concave portion. External connection electrode A concave portion formed in the coaxial resonator on a surface of the dielectric substrate facing the dielectric member along a direction in which the through hole penetrates, and a concave portion formed in the coaxial resonator; And a dielectric member having a viscous or elastic property is disposed between the two.

In the dielectric filter according to the third aspect of the present invention, the outer conductor and the inner conductor are formed by coating the outer peripheral surface and the inner peripheral surface of a dielectric member having a plurality of through holes with a conductive member. And a coaxial resonator in which a short-circuit conductor is formed by coating only one of the through-hole opening end faces of the dielectric member with a conductive member, wherein the coaxial resonator has a short-circuit conductor forming end face. A concave portion is formed in which a part of the outer conductor connected to the opposite open end surface is removed together with the underlying dielectric member, and a dielectric substrate on which an external connection electrode is formed is fitted into the concave portion. The connection electrode is on a surface of the dielectric substrate facing the dielectric member,
A dielectric member having viscosity or elasticity is disposed between the dielectric substrate and a recess formed in the coaxial resonator, the conductive member being formed by arranging a conductive member along the through-hole direction. It is characterized by having been done.

[0012]

According to the present invention, a part of the outer conductor on the open side of the coaxial resonator or a part of the outer conductor including the dielectric member is removed to form a recess, and the dielectric substrate is placed in the recess. By attaching, the external circuit and the coaxial resonator are coupled by the external connection electrode provided on the dielectric substrate, and a viscous or elastic dielectric member is provided between the concave portion and the dielectric substrate. Is provided, thereby widening the band and reducing the loss of the filter using the resonator.

[0013]

1 and 2 are views showing a first reference example for explaining an embodiment of the present invention. 1 and 2,
(1) forms a through-hole (1b) in the prismatic dielectric member (1a),
The outer conductor (1c) and the inner conductor (1d) were formed by coating the outer peripheral surface and the inner peripheral surface with a conductive member (for example, silver).
A coaxial resonator having one end short-circuited, (2) a part of the outer conductor (1c) on the open side of the coaxial resonator (1) or a part of the outer conductor (1c) including the dielectric member (1a) The recess formed by removing (3)
Is a dielectric substrate attached to the concave portion (2), and is provided with a connection electrode (3a) having a width W and a ground electrode (3b).

According to this reference example, the connection electrode (3a) provided on the dielectric substrate (3) and the inner conductor (1d) of the coaxial resonator (1).
When a coupling capacitance is formed between the two, the equivalent circuit is as shown in FIG.

By the way, the coupling degree in such a reference example is as follows.
It is determined by the distance a between the inner conductor (1d) of the coaxial resonator (1) and the lower surface (2a) of the recess (2) and the width W of the connection electrode (3a), and the change is Qe (the value of the external Q). As shown in FIG. FIG. 4A shows the case where the width W of the connection electrode (3a) is fixed and the distance a is changed, and FIG. 4B shows the case where the distance a is fixed and the connection electrode (3a) is The case where the width W is changed is shown.

FIGS. 5 and 6 show a second reference example for explaining the embodiment of the present invention, in which a first coaxial resonator (1) and a second coaxial resonator (1 ') are insulated from each other. This shows an example in which a body filter is configured, in which a first coaxial resonator (1) is on the input side and a second coaxial resonator (1 ') is on the output side. The first coaxial resonator (1) and the second coaxial resonator (1 ′) have concave portions, respectively.
(2) (2 ′) is formed, and a dielectric substrate having an input-side connection electrode (3a ′) and an output-side connection electrode (3a ″) in the recesses (2) and (2 ′). (3) is attached.Each of the connection electrodes (3a ′) and (3a ″) and the inner conductor (1) (1 ′) of the coaxial resonator (1)
d) Combination with (1d ') is performed.

The coupling (coupling between stages) between the coaxial resonators is
This is achieved by joining the windows (4) and (4 ') formed by removing a part of the outer conductor of each coaxial resonator as shown in FIG. 5 (B).

The coaxial resonators (1) (1 ') and the dielectric substrate (3) thus configured are housed in a metal case (5), and the outer conductors (1c) (1
The dielectric filter is completed by electrically connecting c ′) and the metal case (5) by soldering or the like. The metal case (5) is provided with a ground terminal (5a) connected to a ground pattern or the like of a printed circuit board on which the dielectric filter is mounted.

FIGS. 7 and 8 show a third embodiment for explaining the embodiment of the present invention, in which five coaxial resonators (1) are provided.
An example in which a filter is configured using 1) to (15) is shown.
Each of the resonators (11) to (15) is provided with a concave portion (2), and a dielectric substrate (3 ′) is attached to the concave portion (2). The resonators (11) to (15) are coupled to each other via a coupling window.

As shown in FIG. 8, the dielectric substrate (3 ')
The input / output connection electrodes (3a ') and (3a'') and the capacitance forming electrodes (3c') (3c '') and (3c ''') are provided on the upper surface, and the input / output connection electrodes ( The external connection stub electrodes (3d ') and (3d'') and the grounding electrode (3b), which are extended from 3a') and (3a ''), are formed.

The input / output side connection electrodes (3a ') (3
a '') and the inner conductors (1d1) and (1d5) of the coaxial resonators (11) and (15) form input / output coupling capacitances (C1) and (C1 '). Also,
Electrode for capacitance formation (3c ') (3c'')(3c''') and coaxial resonator
Resonator length correction capacitors (C2), (C2 '), and (C2'') are formed between the inner conductors (1d2), (1d3), and (1d4) of (12), (13), and (14).
Further, the jump capacitance (C3) (C3 ') between the input / output side connection electrodes (3a') (3a ") and the capacitance forming electrodes (3c ') (3c") (3c'"). ) (C3 ″) is formed.

FIG. 9 shows an equivalent circuit diagram of the dielectric filter of the third reference example. (L) in the circuit diagram is an interstage coupling inductor.

Resonator length correction capacitance (C2) (C2 ') (C
2 ″) has a capacitance value determined such that the lengths of the coaxial resonators (11) to (15) are the same. This capacitance value is adjusted by the width W of the capacitance forming electrodes (3c ′), (3c ″), and (3c ″ ″).

On the other hand, jump capacity (C3) (C3 ') (C
3 ''), a pole P is formed in the attenuation region of the filter characteristic as shown in the frequency characteristic diagram of FIG. In FIG. 10, the center frequency f0 is 875 MHz, and the bandwidth is 23.6 MHz.

In the dielectric filter of the third reference example,
The external connection stub electrodes (3d ') and (3d'') enable direct connection to the connection pattern of the printed circuit board to be mounted, and allow surface mounting.

FIGS. 11 and 12 show a fourth embodiment for explaining the embodiment of the present invention, in which a first coaxial resonator (1) is shown.
FIG. 9 shows an example in which a dielectric filter is formed by the second coaxial resonator (1 ′) and a dielectric substrate (3) as compared with the second embodiment.
0).

That is, as shown in FIG. 12, in the fourth embodiment, the upper surface of the dielectric substrate (30) attached to the recess (2) of the first and second coaxial resonators (ie, the side attached to the recess). To the inner conductor of the coaxial resonator via a metal wire (31) or a conductive paste, respectively, and a coupling electrode (a non-plated portion formed between the two to form a coupling capacitance). 30a) and (30b) are provided, and external connection electrodes (30c) (30d) for connection to an external circuit are provided on the lower surface.

Thus, in the fourth reference example, a dielectric substrate (30) is attached to the concave portion (2) of the first and second coaxial resonators (1) (1 '), and the dielectric substrate (30) is mounted. ) Of the coupling electrodes (30a) (30b) and the inner conductors (1d) (1d ') of the coaxial resonators (1) (1') and a metal wire (31).
Alternatively, a dielectric filter is formed by connecting with a conductive paste.

The coaxial resonator and the external circuit are connected to the coupling electrodes (30a) (30b) and the external connection electrode (30c) of the dielectric substrate (30).
(30d).

FIG. 13 is a view showing a fifth reference example for explaining the embodiment of the present invention, in which the first coaxial resonator (1) and the second coaxial resonator (1 ') are located outside the open surfaces. An example in which a part of the conductors (1c) and (1c ′) or a part of the outer conductor including the dielectric materials (1a) and (1a ′) is removed to the inner conductor to form the recess (2) is shown.

In this case, in the dielectric filter, the dielectric substrate (30) is attached to the concave portion (2) of the first and second coaxial resonators (1) (1 ') with a conductive adhesive (32). It is constituted by doing. The connection between the coupling electrodes (30a) and (30b) of the dielectric substrate (30) and the inner conductors (1d) and (1d ') of the coaxial resonator is performed by the conductive adhesive (32). This is achieved simultaneously with the attachment of the (30) to the recess (2).

FIG. 14 shows a state in which the dielectric filter of FIG. 11 or FIG. 13 is housed in a metal case (50). The metal case (50) has the ground of a printed circuit board on which the dielectric filter is mounted. Ground terminal (5
0a) is provided. Incidentally, (6) (6 ') is a dielectric substrate (30)
Are connection terminals respectively connected to the external connection electrodes (30a) (30b).

FIG. 15 is a view showing a sixth reference example for explaining an embodiment of the present invention, in which a plurality of through holes (1b), (1b ') and (1b'') are formed in a dielectric member (1a'). A dielectric filter (10) including a plurality of coaxial resonators, one end of which is short-circuited, in which an outer conductor (1c) and an inner conductor are formed by coating a conductive member on the outer peripheral surface and the inner peripheral surface. An example is shown.

In the sixth embodiment, a part of the outer conductor on the open side of the input side coaxial resonator or a part of the outer conductor including the dielectric member is removed to form the first concave portion (2 '). And this first
Dielectric substrate having external connection electrode (30c ') in recess (2')
(30 ′), and removing a part of the outer conductor on the open side of the output side coaxial resonator or a part of the outer conductor including the dielectric member to form a second recess (2 ″), This second recess
(2 '') dielectric substrate (3d) having an external connection electrode (30d ')
0 '') to form a dielectric filter.

FIG. 16 is a view showing a seventh embodiment for explaining the embodiment of the present invention. In comparison with the sixth embodiment, a concave portion (20) is formed over the entire open surface side. Recess (20)
1 shows an example in which one dielectric substrate (300) is attached.
In the seventh reference example, as in the third reference example, the dielectric substrate (3
By providing a capacitance forming electrode in (00), the resonance frequency of each coaxial resonator can be adjusted and the frequency characteristics can be improved.

Incidentally, the dielectric filters shown as the sixth and seventh reference examples are also housed in a metal case and mounted on a printed circuit board as in the other reference examples.

FIG. 17 shows an embodiment of the present invention.
In comparison with the reference example, a dielectric member (1) having viscosity or elasticity such as cyanoacrylate, silicon grease, silicone resin, or epoxy resin is provided between the concave portion (2) and the dielectric substrate (3).
The arrangement (00) improves the coupling efficiency in capacitive coupling between the resonator and the connection electrode.

The shape of the concave portion of the resonator is 1.0 × 3.5 m
m, the width of the connection electrode is 2.5 mm, and according to the second reference example of FIG. 5, the center frequency is 860 MHz and the bandwidth is 1
A dielectric filter having 5 MHz and an insertion loss of 3.0 dB can be obtained. According to the embodiment of FIG.
A dielectric filter having 0 MHz, a bandwidth of 33 MHz, and an insertion loss of 1.5 dB can be obtained.

Further, the concave portion in the third reference example (FIG. 7)
If a dielectric member (100) having viscosity or elasticity as shown in the embodiment of FIG. 17 is disposed between (2) and the dielectric substrate (3 '), Can be improved at the same time in the capacitive coupling.

Further, a first reference example (FIG. 1), a fourth reference example (FIG. 11), a fifth reference example (FIG. 13), and a sixth reference example (FIG. 1)
5), even if a dielectric member having viscosity or elasticity as shown in the embodiment of FIG. 17 is arranged between the concave portion and the dielectric substrate in the seventh reference example (FIG. 16), It goes without saying that the same operation and effect as in the case of applying to FIG. 5 and the third reference example (FIG. 7) can be obtained.

As described above, according to the embodiment of the present invention, it is possible to widen the band and reduce the loss of the filter.

Considering that the state of the electromagnetic field distribution of the TEM resonance occurs perpendicularly to the inner coaxial axis, and that the short-circuit end is inductive and the open end is capacitive,
In order to increase the coupling between the resonators and improve the symmetry of the filter characteristics, the window (4) for coupling between the resonators should be arranged as shown in FIG.
As shown in FIG. 7 (C), it is formed at the central portion of the resonator so that its longitudinal direction is perpendicular to the inner coaxial axis.

It should be noted that the application of the present invention is not limited to the above-described reference example.
Instead of being formed in the longitudinal direction of the coaxial resonator as in the second to third embodiments, it may be formed in a direction perpendicular to the longitudinal direction and led out from the side of the dielectric filter.

[0044]

According to the present invention, at least an external connection electrode is formed in a concave portion formed by removing a part of the outer conductor on the open surface side of the coaxial resonator or a part of the outer conductor including the dielectric member. Since the dielectric substrate with the above is mounted, even when the diameter of the outer coaxial is reduced when miniaturizing the dielectric filter, the connection between the coaxial resonator and the external circuit can be surely performed. Implementation becomes possible. Further, since the dielectric member having viscosity or elasticity is arranged between the concave portion and the dielectric substrate, the filter has a wider band and lower loss.

When a filter is formed by using three or more coaxial resonators, by forming a capacitance forming electrode on the dielectric substrate, the resonator length correction capacitance can be reduced between the inner conductor and the coaxial resonator. So that coaxial resonators of the same length can all be used. In addition, since a jump capacitance is formed between the capacitance forming electrode and the external connection electrode, a frequency characteristic having a pole in the attenuation region can be obtained.

Furthermore, since the length of the connection line between the external connection electrode and the external circuit can be shortened, the capacitance component and the inductive component which are parasitically generated in that portion can be reduced, and the difference in the mounting state can be reduced. The effect on characteristics can be reduced.

[Brief description of the drawings]

FIG. 1A is an external view of a first reference example, and FIG. 1B is a side sectional view thereof.

2A is a diagram illustrating a resonator main body according to a first reference example, and FIG. 2B is a diagram illustrating a dielectric substrate.

FIG. 3 is an equivalent circuit diagram of the first reference example.

FIG. 4 is a characteristic diagram according to a first reference example.

5A is a diagram showing a second reference example, and FIG. 5B is a cross-sectional view thereof.

FIG. 6 is a view showing a state in which it is housed in a metal case.

7A is a view showing a third reference example, and FIG. 7B is a side sectional view thereof.

8A is a perspective view of a dielectric substrate according to a third reference example, FIG. 8B is a bottom view thereof, and FIG. 8C is a cross-sectional view thereof.

FIG. 9 is an equivalent circuit diagram of the dielectric filter of the third reference example.

FIG. 10 is a frequency characteristic diagram of the dielectric filter of the third reference example.

11A is a diagram showing a fourth reference example, and FIG. 11B is a side sectional view thereof.

FIG. 12A is a top view of a dielectric substrate according to a fourth reference example, and FIG. 12B is a bottom view thereof.

13A is a diagram showing a fifth reference example, and FIG. 13B is a side sectional view thereof.

FIG. 14 is a view showing a state where the dielectric filters of the fourth and fifth reference examples are housed in a metal case.

FIG. 15 is a diagram showing a sixth reference example;

FIG. 16 is a diagram showing a seventh reference example;

17A is an external view of an embodiment of the present invention, FIG. 17B is a front view thereof, FIG. 17C is an external view of a coaxial resonator, and FIG. 17D is a view showing a dielectric substrate.

[Explanation of symbols]

 1 Coaxial resonator 1 'Coaxial resonator 11 Coaxial resonator 12 Coaxial resonator 13 Coaxial resonator 14 Coaxial resonator 15 Coaxial resonator 1a Dielectric member 1b Through hole 1b' Through hole 1b '' Through hole 1c Outer conductor 1c ' Outer conductor 1d Inner conductor 1d 'Inner conductor 1d1 Inner conductor 1d2 Inner conductor 1d3 Inner conductor 1d4 Inner conductor 1d5 Inner conductor 2 Recess 2' Recess 2 '' Recess 20 Recess 3 Dielectric substrate 3 'Dielectric substrate 30 Dielectric substrate 30' Dielectric substrate 30 '' Dielectric substrate 300 Dielectric substrate 3a Connection electrode 3a 'Connection electrode 3a' 'Connection electrode 3b Ground electrode 3c' Capacitance forming electrode 3c '' Capacitance forming electrode 3c '' 'Capacitance Forming electrode 3d 'External connection stub 3d' 'External connection stub 30c Connection electrode 30c' Connection electrode 30d 'Connection electrode 30a Coupling electrode 30b Coupling electrode 4 Window 4' Window 5 Metal case 50 Metal Case 100 Dielectric member C1 Input coupling capacitance C1 'Output coupling capacitance C2 Resonator length Positive capacitor C2 'resonator length compensation capacitance C2' 'resonator length compensation capacitor C3 interlaced capacitance C3' interlaced capacitance C3 '' interlaced capacity

Continuation of the front page (56) References JP-A-63-169802 (JP, A) JP-A-54-16152 (JP, A) JP-A-3-254201 (JP, A) JP-A-1-319304 (JP) JP-A-4-211501 (JP, A) Japanese Utility Model Application Laid-Open No. 61-72901 (JP, U) Japanese Utility Model Application No. Sho 62-181005 (JP, U) Japanese Utility Model Application No. Sho 61-302 (JP, U) Japanese Utility Model Application 63-83802 (JP, U)

Claims (8)

(57) [Claims] An outer conductor and an inner conductor are formed by coating a conductive member on an outer peripheral surface and an inner peripheral surface of a dielectric member having a through hole, and only one of the through hole opening end surfaces of the dielectric member is provided. A coaxial resonator main body in which a short-circuit conductor is formed by coating a conductive member on the conductive member, wherein the resonator main body includes a part of an outer conductor connected to an open end face opposite to the short-circuit conductor formation end face. Are formed together with the underlying dielectric member, a concave portion is formed, a dielectric substrate having an external connection electrode formed therein is fitted into the concave portion, and the external connection electrode is formed of the dielectric material of the dielectric substrate. Formed by arranging a conductive member on the surface facing the member along the penetrating direction of the through-hole, between the concave portion formed in the resonator body and the dielectric substrate, viscous or elastic A dielectric member having Dielectric resonators, characterized in that is. 2. The dielectric resonator according to claim 1, wherein the external connection electrode extends to a surface on a back side of a surface of the dielectric substrate facing the dielectric member. 3. An outer conductor and an inner conductor are formed by coating a conductive member on an outer peripheral surface and an inner peripheral surface of a dielectric member having a through hole, and only one of the through hole opening end surfaces of the dielectric member. A plurality of coaxial resonators in which a short-circuit conductor is formed by coating a conductive member on the short-circuit end. An open end face opposite to the end face is aligned and arranged adjacently, and each of the coaxial resonators is formed with a concave portion in which a part of an outer conductor connected to the open end face is removed together with a base dielectric member thereof. The recesses of the adjacent coaxial resonators are connected to each other, and a dielectric substrate having an external connection electrode formed therein is fitted into the connection recess, and the external connection electrode is formed of the dielectric material of the dielectric substrate. Facing body members A dielectric member having a viscosity or elasticity formed between the concave portion formed in the coaxial resonator and the dielectric substrate formed by disposing a conductive member along a penetrating direction of the through hole. The dielectric filter, wherein is disposed. 4. The dielectric filter according to claim 3, wherein the external connection electrode extends to a surface on a back side of a surface of the dielectric substrate facing the dielectric member. 5. A resonator length for providing at least three coaxial resonators, wherein the dielectric substrate is capacitively coupled to inner conductors of the respective coaxial resonators to correct the effective length of the coaxial resonators. A correction electrode is formed, and the resonator length correction electrode is formed by arranging a conductive member on a surface of the dielectric substrate facing the dielectric member, along a penetrating direction of the through hole. The external connection electrode and the resonator length correction electrode are formed so as to also function as a jump capacitance forming electrode for jumping over at least one coaxial resonator and capacitively coupling the plurality of coaxial resonators. The dielectric filter according to claim 3, wherein 6. An outer conductor and an inner conductor are formed by coating a conductive member on an outer peripheral surface and an inner peripheral surface of a dielectric member having a plurality of through holes, and an end surface of a through hole opening of the dielectric member. A coaxial resonator having a short-circuit conductor formed by coating only one of the conductive members, wherein the coaxial resonator includes a part of an outer conductor connected to an open end face opposite to the short-circuit conductor formation end face. Are formed together with the underlying dielectric member, a concave portion is formed, a dielectric substrate having an external connection electrode formed therein is fitted into the concave portion, and the external connection electrode is formed of the dielectric material of the dielectric substrate. On the surface facing the member, formed by arranging a conductive member along the direction of penetration of the through-hole, between the recess formed in the coaxial resonator and the dielectric substrate, viscous or Elastic dielectric part Dielectric filter, wherein a is disposed. 7. The dielectric filter according to claim 6, wherein the external connection electrode extends to a surface on a back side of a surface of the dielectric substrate facing the dielectric member. 8. The coaxial resonator has three or more through holes, and the dielectric substrate is capacitively coupled to an inner conductor of the coaxial resonator to correct an effective length of the coaxial resonator. The resonator length correction electrode is formed by arranging a conductive member on a surface of the dielectric substrate facing the dielectric member along a penetrating direction of the through hole. Wherein the external connection electrode and the resonator length correction electrode jump over at least one coaxial resonator to form a jumping capacitor forming electrode for capacitively coupling the plurality of coaxial resonators. 7. The dielectric filter according to claim 6, which also serves as a dielectric filter.