JP3203728B2 - Dielectric resonator and method for adjusting characteristics thereof - 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 in which an inner conductor is formed in a dielectric and an outer conductor is formed on the outer surface of the dielectric, and a method for adjusting the characteristics of the dielectric resonator.

[0002]

2. Description of the Related Art A dielectric resonator in which a resonance electrode is formed inside a dielectric block and a ground electrode is formed on the outer surface of the dielectric block, and a strip line is formed on one main surface,
A so-called tri-plate type dielectric resonator in which strip lines are opposed to each other using a dielectric substrate having a ground electrode formed on the other main surface is used as, for example, a band-pass filter in a microwave band.

FIG. 28 is an exploded perspective view showing the structure of a conventional general dielectric resonator using a dielectric block. In FIG. 28, reference numeral 1 denotes a substantially hexahedron-shaped dielectric block having three inner conductor forming holes indicated by 16, 17, and 18, and coupling holes 19 and 20 provided between the inner conductor forming holes. Inner conductors are formed on the inner surfaces of the inner conductor forming holes 16, 17, and 18, and outer conductors 21 are formed on the other five surfaces except the open surface indicated by 22. 23 and 24 are so-called resin pins, which are resin portions 23a and 24a and signal input / output terminals 23b and 2 respectively.
4b. By inserting these two resin pins 23 and 24 into the inner conductor forming holes 16 and 18 from the open side of the dielectric block, the terminals 23b and 24b are capacitively coupled to the inner conductors in the inner conductor forming holes 16 and 18. . Reference numeral 25 denotes a case which holds the dielectric block 1 and the resin pins 23 and 24 and covers the opening surface of the dielectric block. Insert the resin pins 23 and 24 into the dielectric block 1 respectively,
The whole is integrated by covering the case 25 and soldering the outer conductor 21 of the dielectric block 1. When mounting this dielectric resonator, the projection 25
a and 25b function as ground terminals.

[0004]

However, as shown in FIG. 28, even when a plurality of resonators are formed in a single dielectric block, a large number of components such as input / output terminals and a case are required. Not only does the assembly process become complicated, but also when the finished product is mounted on a circuit board, it must be mounted as an electronic component with leads, and other electronic components mounted on the same circuit board must be mounted. It was not possible to mount on the surface, and it was difficult to reduce the height. Even if the case 25 is not used by directly connecting the outer conductor 21 of the dielectric block 1 to the ground electrode on the circuit board,
Since the open surface 22 is exposed and an electromagnetic field leak occurs at this portion, when a metal body approaches the open surface, the metal surface is affected by the metal body, and the resonator is coupled with an external electromagnetic field,
The desired characteristics as a dielectric resonator cannot be obtained.

An object of the present invention is to provide a dielectric resonator which can be surface-mounted on a circuit board without using resin pins 23 and 24 and a case 25 as individual components as shown in FIG. Is to do.

Another object of the present invention is to provide a dielectric resonator which suppresses the electromagnetic field leakage between the inside and the outside near the opening to solve the above-mentioned problem caused by the electromagnetic field leakage.

It is a further object of the present invention to provide a method for adjusting the characteristics of a dielectric resonator which can easily and accurately adjust predetermined resonator characteristics.

[0008]

According to a first aspect of the present invention, there is provided a dielectric resonator comprising: a dielectric body having a substantially hexahedral shape;
In a dielectric resonator in which a plurality of inner conductor forming holes in which an inner conductor is formed and an outer conductor is formed on an outer surface of the dielectric , at least one opening surface of the inner conductor forming hole has an inner conductor formed therein.
The inner diameter is larger than the other part of the conductor forming hole,
With the formation of shallow-bottom depressions around the body formation holes
In the inner conductor forming hole deeper than the recess,
A non-body-forming portion is provided, and furthermore, a signal input / output electrode capacitively coupled to the inner conductor is provided in a part of the outer conductor , and the outer conductor is formed of the substantially hexahedral dielectric except for the vicinity of the signal input / output electrode. It is characterized by being formed on the entire outer surface.

A method for adjusting the characteristics of the dielectric resonator according to the second aspect.
The method uses an inner conductor forming hole with an inner conductor formed on the inner surface as a dielectric.
And a dielectric formed by forming an outer conductor on the outer surface of the dielectric.
A method for adjusting the characteristics of a resonator, comprising:
At least one of the openings has a recess centered on the inner conductor formation hole.
Is formed in advance, and the deeper
The inner conductor forming hole is smaller in diameter than
Keep the diameter almost the same, and from the dent to the back side,
In addition to deleting the inner surface, the amount of
Adjust the frequency of resonators and the degree of coupling between resonators
It is characterized by the following.

[0010]

According to a third aspect of the present invention, there is provided a dielectric resonator having a substantially hexahedral shape.
A plurality of inner conductors with an inner conductor formed on the inner surface inside a shaped dielectric
Providing a body forming hole, forming an outer conductor on the outer surface of the dielectric
Wherein the inner diameter of the inner conductor forming hole is
Nearly constant and near the opening surface of the inner conductor forming hole
At a predetermined position deeper than the opening
An inner conductor non-formed portion is provided, and the inner conductor non-formed portion is
Depending on the capacitance formed, the degree of coupling between adjacent resonators and
Adjusting the resonance frequency of the resonator to a predetermined value;
Signal input / output electrodes for capacitive coupling with the inner conductor
And the outer conductor is removed in the vicinity of the signal input / output electrode.
Formed on the entire outer surface of the substantially hexahedral dielectric.
It is characterized by.

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

In the dielectric resonator according to the first aspect of the present invention,
Opening surface of at least one of the inner conductor forming holes of the dielectric resonator
In addition, the inner diameter is larger than other portions of the inner conductor forming hole, and
A shallow-bottom dent is formed around the inner conductor formation hole.
And the inner conductor formation hole deeper than the depression.
Is provided with an inner conductor non-formed portion having a predetermined width. That
The inner conductor on the inner surface of the inner conductor forming hole
The resonance frequency of the resonator and the resonance
The degree of coupling between vessels can be adjusted. Moreover, the open part of the inner conductor is
It occurs inside the opening of the conductor forming hole and
External electromagnetic field leakage is improved and stable resonator characteristics
can get.

A method for adjusting the characteristics of the dielectric resonator according to the second aspect.
In the method, at least one opening surface of the inner conductor forming hole is
A depression is formed in advance around the opening of the conductor forming hole,
Remove the inner surface from the depression to the back side, and
The frequency of the resonator and the distance between
The degree of coupling is adjusted. Thus, the inner conductor near the dent formation
By removing the body, the inner conductor forming hole opening
The edges are not removed and the inner conductor and dielectric
The part can be deleted with high precision. As a result, the resonator
By adjusting the characteristics with high precision, the desired resonator characteristics can be adjusted easily and
Can be obtained in a short time.

[0020]

In the dielectric resonator according to the third aspect, the inner conductor
By setting the formation position and width of the non-formed part
The resonance frequency of the resonator and the degree of coupling between the resonators
Meet the value. In addition, open near the opening surface of the inner conductor forming hole.
An open part is formed in a part of the inner conductor deeper than the mouth
Therefore, electromagnetic field leakage is suppressed. Moreover,
Since there is no need to provide coupling holes, the whole can be easily miniaturized.
Can be The signal input / output electrodes are part of the outer conductor.
Are provided as individual components for capacitive coupling with the inner conductor.
All signal input / output terminals are unnecessary, and the surface
By attaching the outer conductor to the ground electrode on the circuit board
And connect the signal input / output electrodes to the signal on the circuit board.
No. line can be connected.

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A structure of a dielectric resonator according to a first embodiment of the present invention and a method of adjusting characteristics thereof will be described with reference to FIGS.

FIG. 1 is a perspective view of a dielectric resonator. FIG.
, 5 and 6 are inner conductor forming holes provided in the substantially hexahedral dielectric block. Inner conductors are previously formed on the inner surfaces of the inner conductor forming holes 5 and 6. An outer conductor 4 is formed on the outer surface (six surfaces) of the dielectric block. Signal input / output electrodes 9 and 10 are formed on a part of the outer conductor 4.

FIG. 2 is a vertical sectional view passing through the inner conductor forming hole 6 in FIG. On the inner surface of the inner conductor forming hole 6, an inner conductor indicated by 3 is formed over the entire surface between the two openings. In order to obtain a dielectric resonator having a predetermined characteristic from such a dielectric block, a portion where the inner conductor is not formed (hereinafter referred to as an open portion) is provided in a part of the inner conductor, and the resonance frequency and the degree of coupling are adjusted. The inner conductor forming holes 5, 6
Remove the inner conductor near one of the openings. FIG. 4 is a perspective view showing a state after deletion, and FIG. 3 is a vertical sectional view thereof. As shown by A and B in FIG. 3, by removing the inner conductor near the opening of the inner conductor forming hole, the portion is made an open portion. FIG. 5 is a view in which the dielectric resonator shown in FIG. 4 is cut and separated at the center horizontal plane with the signal input / output electrode forming surface facing down. For example, at the open portion of the inner conductor 2, a tip capacitance Cs is generated between the tip of the inner conductor 2 and the outer conductor 4, and an external coupling capacitance Ce is generated between the vicinity of the tip of the inner conductor 2 and the signal input / output electrode 9. . In this manner, the tip capacitance is adjusted by the dimension S shown in FIG. 3, and thereby the resonance frequency of the resonator and the degree of coupling between the resonators are adjusted.

FIG. 6 is an equivalent circuit diagram of the dielectric resonator shown in FIGS. In FIG. 6, R1 is a resonator formed by the inner conductor 2, and R2 is a resonator formed by the inner conductor 3. Cs is the tip capacitance formed at the open portion of each inner conductor.
Ce is an external coupling capacitance formed between the signal input / output electrodes 9 and 10 and the open portion of the inner conductor.

Next, FIG. 7 shows a structure of a dielectric resonator according to a second embodiment in which openings are formed at different positions in the inner conductor forming hole. 7A is a horizontal sectional view at the center of the dielectric block, and FIG. 7B is a front view of the dielectric block as viewed from the short-circuit surface side. In this way, the open portions of the inner conductors 2 and 3 provided in the inner conductor forming hole are provided at locations deeper than the opening of the inner conductor forming hole, and the tip capacitance Cs is formed in the open portion. This makes it possible to further suppress electromagnetic field leakage.

Next, the structure of a dielectric resonator according to a third embodiment in which the resonance frequency and the degree of coupling are adjusted by providing a conductor and a dielectric removal portion on a part of the short-circuit surface is shown in FIG.
Shown in FIG. 8 is a front view as viewed from the short-circuit surface side.
Denotes a deleted portion of the conductor and the dielectric on the short-circuit surface. In FIG. 8, by partially removing the conductor and the dielectric in the region S1, the resonance frequency of the resonator formed by the inner conductor forming hole 5 is reduced. Similarly, if the conductor and the dielectric are partially removed in the region of S2, the resonance frequency of the resonator due to the inner conductor forming hole 6 decreases. On the other hand, if the conductor and the dielectric are partially removed in the region S12, the degree of coupling between the two resonators is reduced. Here, FIGS. 9 and 11 show examples of changes in the coupling coefficient due to deletion of the conductor and the dielectric. As shown in FIG.
A conductor deleted portion having a width d was provided at an intermediate position between the two coupling holes, and a change in coupling coefficient when the area S was changed was measured. In FIG. 9, a = 2.0 mm, b = 4.0 mm, c
= 5.0 mm. In FIG. 11, the horizontal axis represents the conductor removal area S, and the vertical axis represents the change ratio of the coupling coefficient when Ko is the coupling coefficient when S = 0 and the coupling coefficient is Ka when the conductor is removed. Thus, the coupling coefficient can be adjusted by the conductor removal area between the inner conductor forming holes on the short-circuit surface. FIGS. 10 and 12 show examples of adjusting the resonance frequency. As shown in FIG. 10, a conductor removed portion having a width f and a length g was provided at a position apart from the inner conductor forming hole by a predetermined distance, and the resonance frequency when the length g was changed was measured. In FIG. 10, a =
2.0 mm, e = 3.0 mm, and f = 0.5 mm.
In FIG. 12, the horizontal axis represents the length g, and the vertical axis represents the amount of change in the resonance frequency based on the resonance frequency when g = 0. As described above, the resonance frequency can be adjusted by removing the conductor around the inner conductor forming hole on the short-circuit surface.

In the examples shown in FIGS. 8 to 12, a part of the conductor and the dielectric is deleted on the short-circuit surface, but if the conductor and the dielectric on the opening surface on the side where the inner conductor is not formed are deleted, the capacitance is reduced. C
s is reduced, and the resonance frequency can be adjusted in a higher direction.

Further, in the examples shown in FIGS. 8 to 12, a two-stage dielectric resonator is taken as an example, but the same can be applied to a dielectric resonator having three or more stages. In this case, FIG.
As shown in 3, adjust the degree of coupling between the resonators by between opening of the inner conductor formed holes S12, S23, the ··· S _n-1 n region of conductor and dielectric portions deleted in short surface Then, the resonance frequency of each resonator can be adjusted by partially removing the conductor and the dielectric in the regions S1, S2, S3,...

Next, a fifth input / output electrode having a different shape is used.
FIG. 1 is a perspective view showing the structure of the dielectric resonator according to the first embodiment.
It is shown in FIG. In FIG. 14, reference numerals 16, 17, and 18 denote inner conductor forming holes, on which inner conductors and open portions are formed. The outer conductor 4 is provided on the outer surface of the dielectric block, and the signal input / output electrodes 9 and 10 are formed only on the upper surface in the figure. The electrode 9 is capacitively coupled to the inner conductor in the inner conductor forming hole 16, and the electrode 10 is capacitively coupled to the inner conductor in the inner conductor forming hole 18. When this dielectric resonator is mounted on a circuit board, the dielectric resonator is surface-mounted with the upper surface in the figure facing the circuit board.

Next, the structure of a dielectric resonator according to a sixth embodiment and a method of adjusting the characteristics thereof will be described with reference to FIGS.

FIG. 15 is an exploded perspective view of the dielectric resonator. In FIG. 15, reference numerals 1a and 1b denote dielectric substrates, respectively. On one main surface of each of the dielectric substrates 1a and 1b, two grooves each having a semicircular cross section are formed, and an inner conductor is formed on the inner surface. 2b and 3b are dielectric substrates 1b
This is the inner conductor provided on the side. Depressions 7a, 8a, 7b, 8b are formed in one opening of the grooves of the dielectric substrates 1a, 1b, respectively. An outer conductor 4a is provided on a main surface and four side surfaces of the dielectric substrate 1a facing the inner conductor forming surface, and an outer conductor 4b is provided on a main surface and four side surfaces of the dielectric substrate 1b facing the inner conductor forming surface. I have. Further, signal input / output electrodes 9 and 10 are formed in a part of the dielectric substrate 1a in a region where the outer conductor 4a is formed.

FIG. 16 shows a dielectric resonator before the characteristic adjustment, in which the two dielectric substrates shown in FIG. 15 are joined with the inner conductors facing each other. Thus, the inner conductor forming holes 5 and 6 having a circular cross section are formed by the combination of the grooves having the semicircular cross section. Further, step-shaped depressions 7 and 8 as shown in the figure are formed by a combination of depressions formed on one opening surface. After the characteristic adjustment, the dielectric resonator shown in FIG. 16 is surface-mounted with the upper surface of the same figure in contact with the mounting substrate surface.

FIG. 17 is a cross-sectional view passing through the inner conductor forming hole 6 of the dielectric resonator shown in FIG.

However, in order to avoid complicating the drawing, lines on the bonding surface of the dielectric substrate are omitted (the same applies to the drawings referred to in the following description).

FIGS. 18 and 19 show two examples in which an opening is formed in a part of the inner conductor and the resonator characteristics are adjusted. In FIG. 18, A is a portion in which a part of 3a and 3b is deleted in the vicinity of the depression forming portion. Specifically, a grinding tool such as a luter to which a grindstone having a shape as shown in 11 is attached is used. By removing a part of the inner conductor in this way, the removed part is made an open part. Since the removed portion A of the inner conductor is formed at a position deeper than the opening F, the electromagnetic field leakage from the opening F to the inside is suppressed, and the resonator is hardly affected by the electromagnetic field around the resonator. . Therefore, even if a metal body is present near the opening surface F, the characteristics are not disturbed by the influence of the metal body. In the case where the adjustment is performed using a router as shown in FIG. 18, the inner conductor 3 may be adjusted depending on the insertion depth of the router.
The amount of deletion of a and 3b is controlled, thereby adjusting the tip capacity. If the tip capacitance changes, the resonator frequency and the degree of coupling with the adjacent resonator change, so that a predetermined resonator characteristic can be obtained by adjusting the insertion depth of the luter into the inner conductor forming hole. As shown in FIG. 18, since the tip capacitance formed at the open portion of the inner conductor is large, the degree of coupling between the resonators can be increased and the band can be easily widened.

FIG. 19 shows another adjustment characteristic method. FIG.
In the figure, B is a portion where the dielectric is removed together with the inner conductor in the vicinity of the depression forming portion. In order to grind the dielectric together with the inner conductor in this way, the luter 11 provided with a grindstone having a hollow diameter larger than the inner diameter of the inner conductor forming hole is used. Therefore, the dielectric can be easily ground together with the inner conductor by a fixed amount by inserting the luter in the axial direction from the recess forming portion along the center axis of the inner conductor forming hole.

Next, FIG. 20 shows a sectional view of a dielectric resonator according to a seventh embodiment. In FIG. 20, A and B indicate locations where the inner conductor is deleted. In this manner, by grinding a part of the inner conductor near the opening surface of the inner conductor forming hole and at a position deeper than the opening surface, an open portion of the inner conductor is formed at a position deeper than the opening surface. Therefore, the problem due to the electromagnetic field leakage is solved. In order to form and adjust such an open portion, a boring operation may be performed by inserting a diagonally from the open portion using a luter to which a grindstone having a relatively small diameter is attached. At this time, a part of the dielectric can be ground together, and the tip capacitance can be adjusted depending on the depth.

Next, the structure of a dielectric resonator according to an eighth embodiment and a method of adjusting the characteristics thereof will be described with reference to FIGS.

FIG. 21 is a sectional view of an inner conductor forming hole portion of the dielectric resonator. The basic structure is substantially the same as that shown in FIGS. 15 and 16, but unlike the sixth embodiment, a narrowed portion 13 is formed in one open portion of the inner conductor forming hole. As shown in FIG. 21, inner conductors 3a and 3b are formed on the inner surface of the inner conductor forming hole, and outer conductors 4a and 4b are provided on the outer surface of the dielectric resonator. Further, the aperture unit 11
A conductive film continuous from the inner conductor to the outer conductor is also formed on the inner surface of the substrate.

FIG. 22 is a diagram showing an example of a method of forming and adjusting the opening. In FIG. 22, A is a deleted portion of the inner conductor and the dielectric. By partially removing the inner conductor on the inner conductor forming hole side of the narrowed portion 13 in this manner, an open portion of the inner conductor is formed at a position deeper than the opening surface. Therefore, electromagnetic field leakage is suppressed. In order to form such an open part and adjust the characteristics, insert the grinder stone of the luter from the open part of the open part of the inner conductor forming hole where the throttle part is not formed, and adjust the grinding amount according to the insertion depth. To adjust.
The change ratio of the tip capacity with respect to the insertion amount of the grindstone differs depending on the tip shape of the grindstone. In consideration of the efficiency and accuracy of characteristic adjustment, a grindstone having a shape as shown in FIG. 23 or FIG. 24 may be used.

Next, the structure and adjustment method of the dielectric resonator according to the ninth embodiment will be described with reference to FIGS.

FIG. 25 shows one substrate constituting the dielectric resonator. In FIG. 25, 1b is a dielectric substrate. Two grooves having a semicircular cross section are formed on one main surface of the dielectric substrate 1b, and inner conductors 2b and 3b are formed on the inner surface thereof.
However, one side of the narrowed portion is formed in a part of the groove. An outer conductor 4b is formed on the other main surface and four side surfaces of the dielectric substrate 1b facing the inner conductor. A dielectric resonator is formed by joining substrates having the same shape as this substrate so as to face each other.

FIG. 26 is a sectional view of the same. In FIG. 26, reference numerals 15a and 15b constitute a narrowed portion in a part of the inner conductor forming hole. In a dielectric resonator having such a constricted portion in a part of the inner conductor forming hole, in order to form an open portion in the inner conductor and adjust the characteristics, as shown in FIG. The inner conductor formed on the inner surface of the aperture portion is deleted from one of the opening surfaces by using a router or the like.
In FIG. 27, A indicates the deleted portion. In this manner, since the open portion of the inner conductor is formed at a position deeper than the opening surface, electromagnetic field leakage is suppressed. Further, since the grinding range by the luter or the like is limited to the narrowed portion, the adjustment work is facilitated and the adjustment accuracy is improved.

In the sixth to ninth embodiments, an example in which two dielectric substrates are overlapped has been described as an example. However, the structure and characteristic adjustment method as in the sixth to ninth embodiments is the same as that of the sixth to ninth embodiments. The present invention can be similarly applied to an integrated dielectric resonator in which an inner conductor forming hole is provided in a single dielectric block as in the first to fifth embodiments. In the structure and characteristic adjustment method as in the first to fifth embodiments, two dielectric substrates are overlapped as in the sixth to ninth embodiments, and an inner conductor forming hole is provided inside. The same can be applied to the above-described dielectric resonator.

Further, in the embodiment, a comb-line type dielectric resonator has been described as an example, but the present invention can be similarly applied to an interdigital type.

[0053]

According to the first, second , and third aspects of the present invention, a dielectric material is provided.
According to the body resonator, the inner conductor non-formed portion in the inner conductor formation hole
Depending on the width, the degree of coupling between adjacent resonators and the resonance of the resonators
The frequency can meet the predetermined value,
Arbitrary filter characteristics can be obtained. Further, since the signal input / output electrodes are provided on a part of the outer conductor , the signal input / output electrodes can be surface-mounted on the circuit board without using special individual signal input / output terminals. In addition, since the conductor is present on the opening surface of the inner conductor forming hole and is not an open surface, there is little electromagnetic field leakage, and even if it is mounted on a circuit board as it is, the effect of the electromagnetic field leakage is small.

[0054]

[0055] According to the dielectric resonator according to claim 3 and 5, since it is formed at a position opening portion of the inner conductor is recessed from the opening face of the inner-conductor-formed holes, are less affected by the electromagnetic field leakage. Therefore, there is no coupling between the resonator and another object or circuit near the resonator, and stable resonator characteristics can be obtained.

According to the characteristic adjusting method of the dielectric resonator according to the fourth aspect , the positions where the inner conductor and the dielectric are removed are limited, and the inner conductor can be removed only by moving the grinding tool in the axial direction of the inner conductor forming hole. The opening portion is provided in a part, and the tip capacity can be easily adjusted by the amount of movement. Moreover, since the tip capacity only gradually decreases despite the large amount of grinding, the dimensional accuracy required for grinding is not high, and a dielectric resonator having a predetermined resonance frequency and coupling amount is required. Can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a dielectric resonator according to a first embodiment during manufacture.

FIG. 2 is a cross-sectional view of the dielectric resonator according to the first embodiment during manufacture.

FIG. 3 is a cross-sectional view of the dielectric resonator according to the first embodiment.

FIG. 4 is a perspective view of the dielectric resonator according to the first embodiment.

FIG. 5 is an exploded perspective view of the dielectric resonator according to the first embodiment.

FIG. 6 is an equivalent circuit diagram of the dielectric resonator according to the first embodiment.

FIGS. 7A and 7B are diagrams showing a structure of a dielectric resonator according to a second embodiment, in which FIG. 7A is a horizontal sectional view and FIG. 7B is a front view.

FIG. 8 is a front view of a dielectric resonator according to a third embodiment.

FIG. 9 is a front view showing an example of removing conductors for measuring characteristics of a dielectric resonator according to a third embodiment.

FIG. 10 is a partial front view showing an example of deleting conductors for measuring characteristics of a dielectric resonator according to a third embodiment.

FIG. 11 is a diagram illustrating a measurement result of a change in a coupling coefficient of the dielectric resonator according to the third example.

FIG. 12 is a diagram showing a measurement result of a change in resonance frequency of the dielectric resonator according to the third example.

FIG. 13 is a front view of a dielectric resonator according to a fourth embodiment.

FIG. 14 is a perspective view of a dielectric resonator according to a fifth embodiment.

FIG. 15 is an exploded perspective view of a dielectric resonator according to a sixth embodiment.

FIG. 16 is a perspective view of a dielectric resonator according to a sixth embodiment.

FIG. 17 is a sectional view of a dielectric resonator according to a sixth embodiment.

FIG. 18 is a sectional view of a dielectric resonator according to a sixth embodiment.

FIG. 19 is a sectional view of a dielectric resonator according to a sixth embodiment.

FIG. 20 is a sectional view of a dielectric resonator according to a seventh embodiment.

FIG. 21 is a sectional view of a dielectric resonator according to an eighth embodiment.

FIG. 22 is a sectional view of a dielectric resonator according to an eighth embodiment.

FIG. 23 is a view showing a shape of a grindstone.

FIG. 24 is a view showing a shape of a grindstone.

FIG. 25 is a perspective view of one dielectric substrate constituting a dielectric resonator according to a ninth embodiment.

FIG. 26 is a sectional view of a dielectric resonator according to a ninth embodiment.

FIG. 27 is a sectional view of a dielectric resonator according to a ninth embodiment.

FIG. 28 is an exploded perspective view of a conventional dielectric resonator.

[Explanation of symbols]

 1-Dielectric block 1a, 1b-Dielectric substrate 2, 2a, 2b, 3, 3a, 3b-Inner conductor 4, 4a, 4b-Outer conductor 5, 6, 16, 17, 18-Inner conductor forming hole 7, 7a, 7b, 8, 8a, 8b-depression 9, 10-signal input / output electrode 11-router 13, 14, 15-diaphragm A, B-deleted part (inner conductor non-formed part) C, D-deleted part F −Opening surface

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideyuki Kato 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto, Japan Inside Murata Manufacturing Co., Ltd. (72) Inventor Yukihiro Kitaichi 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto, Japan Inside Murata Manufacturing Co., Ltd. (72) Inventor Hisashi Mohri 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Pref. Murata Manufacturing Co., Ltd. (56) References JP-A-3-124101 (JP, A) Special Table Sho-59- 500198 (JP, A) US Patent Patent 637896 (SU, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01P 1/20-1/219 H01P ^7/ 00-7/10

Claims (3)

(57) [Claims] An inner conductor is provided on an inner surface of a substantially hexahedral dielectric.
A plurality of inner conductor forming holes formed with an outer conductor formed on an outer surface of the dielectric, wherein the inner conductor is formed on at least one opening surface of the inner conductor forming hole.
The inner diameter is larger than the other part of the forming hole, and, at the center of the inner conductor forming hole , a shallow dent is formed,
A predetermined width of the inner conductor
Forming part, further providing a signal input / output electrode capacitively coupled to the inner conductor on a part of the outer conductor , and further forming the outer conductor on the entire outer surface of the substantially hexahedral dielectric except for the vicinity of the signal input / output electrode. A dielectric resonator characterized in that it is formed in a dielectric resonator. 2. A method for adjusting characteristics of a dielectric resonator, comprising: forming an inner conductor forming hole in which an inner conductor is formed on an inner surface of a dielectric, and forming an outer conductor on an outer surface of the dielectric; On at least one opening surface of the formation hole, a depression centering on the inner conductor formation hole is formed in advance,
The inner conductor forming hole on the back side of the dent has a smaller diameter than the dent, and has substantially the same diameter over the entire length,
From the dent to the back side, while deleting its inner surface,
A characteristic adjusting method of a dielectric resonator, comprising adjusting a frequency of a resonator and a degree of coupling between the resonators according to a depth of the resonator. 3. An inner conductor in an inner surface of a substantially hexahedral dielectric.
A plurality of inner conductor forming holes formed with an outer conductor formed on the outer surface of the dielectric, wherein the inner conductor forming hole has a substantially constant inner diameter and the inner conductor forming hole An inner conductor non-forming portion having a predetermined width is provided at a predetermined position near the opening surface and deeper than the opening surface, and the degree of coupling between adjacent resonators is increased by the capacitance formed by the inner conductor non-forming portion. Adjusting the resonance frequency of the resonator to a predetermined value, providing a signal input / output electrode capacitively coupled to the inner conductor on a part of the outer conductor, and further arranging the outer conductor except for the vicinity of the signal input / output electrode. A dielectric resonator formed on the entire outer surface of a hexahedral dielectric.