JPH05183309A - Dielectric resonator and its characteristic adjustment method - Google Patents

Abstract

PURPOSE:To attain the surface mount on a printed circuit board without use of a special individual signal input/output terminal by providing a signal input/ output electrode to part of an outer conductor. CONSTITUTION:An inner conductor is formed in advance to an inner face of inner conductor forming holes 5, 6 provided to a dielectric block of nearly hexahedron. Moreover, an outer conductor 4 is formed to outer faces (six faces) of the dielectric block and signal input/output electrodes 9, 10 are formed to part of the outer conductor 4. Furthermore, an inner conductor is formed to the entire face over two openings in the inner face of inner conductor forming holes 5, 6. When the dielectric resonator having a prescribed characteristic is obtained from the dielectric block, a non-forming part of the inner conductor (opening) is provided to part of the inner conductor and the inner conductor near one opening of the inner conductor forming holes 5, 6 is eliminated for the adjustment of the resonance frequency and the degree of coupling. The resonance frequency of the resonator and the degree of coupling between the resonators are adjusted by adjusting the tip capacitance in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator having an inner conductor formed in a dielectric body and an outer conductor formed on the outer surface of the dielectric body, and a method for adjusting the characteristic thereof.

[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, or a strip line is formed on one main surface,
A so-called triplate-type dielectric resonator in which striplines 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 bandpass filter in the 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 hexahedral dielectric block, which has three inner conductor forming holes 16 and 17 and coupling holes 19 and 20 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. Reference numerals 23 and 24 are so-called resin pins, which are resin portions 23a and 24a and signal input / output terminals 23b and 2, respectively.
It consists of 4b. By inserting the two resin pins 23, 24 into the inner conductor forming holes 16, 18 from the open surface side of the dielectric block, the terminals 23b, 24b are capacitively coupled with the inner conductors in the inner conductor forming holes 16, 18. .. Reference numeral 25 is a case that holds the dielectric block 1 and the resin pins 23 and 24 and covers the opening surface portion of the dielectric block. Insert the resin pins 23 and 24 into the dielectric block 1,
The whole body is integrated by covering the case 25 and soldering it to the outer conductor 21 of the dielectric block 1. When mounting this dielectric resonator, the protrusion 25 of the case 25
a and 25b act 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 can be formed. Not only is it necessary to complicate the assembly process, but also when the finished product is mounted on the circuit board, it must be mounted as a leaded electronic component, and other electronic components mounted on the same circuit board are not required. It was not possible to mount it on the surface like this, 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 opening surface, the metal body is affected, and the resonator couples 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 the resin pins 23 and 24 and the case 25 as individual parts as shown in FIG. To do.

Another object of the present invention is to provide a dielectric resonator which suppresses electromagnetic field leakage between the inside and the outside in the vicinity of the opening and solves the above-mentioned problems due to electromagnetic field leakage.

A further object of the present invention is to provide a dielectric resonator characteristic adjusting method capable of easily and accurately adjusting a predetermined resonator characteristic.

[0008]

According to a first aspect of the present invention, there is provided a dielectric resonator having a plurality of inner conductor forming holes formed in a dielectric body and an outer conductor formed on an outer surface of the dielectric body. In the resonator, an inner conductor non-forming portion is provided near at least one opening surface of the inner conductor forming hole, and a signal input / output electrode capacitively coupled to the inner conductor is provided in a part of the outer conductor. And

A dielectric resonator according to a second aspect is the first aspect.
In the dielectric resonator described above, the dielectric is formed into a substantially hexahedral shape, and the signal input / output electrodes are formed only on the circuit board mounting surface.

A dielectric resonator according to a third aspect of the present invention is a dielectric resonator in which a plurality of inner conductor forming holes are provided in a dielectric body, and outer conductors are formed on an outer surface of the dielectric body. One of the opening surfaces is used as a short-circuit surface, a non-formed portion of the inner conductor is provided in the vicinity of the other opening surface, and a signal input / output electrode that capacitively couples with the inner conductor is provided in a part of the outer conductor. It is characterized in that a conductor and a deleted portion of the dielectric are formed on the other opening surface or a part of both surfaces thereof.

A dielectric resonator according to a fourth aspect is a dielectric resonator in which an inner conductor forming hole having an inner conductor formed on an inner surface is provided in a dielectric, and an outer conductor is formed on an outer surface of the dielectric. A recess is formed in the vicinity of the inner conductor forming hole on at least one opening surface of the inner conductor forming hole, and the inner conductor near the recess forming portion is deleted.

According to a fifth aspect of the present invention, there is provided a dielectric resonator characteristic adjusting method, wherein an inner conductor forming hole having an inner conductor formed on an inner surface is provided in the dielectric, and an outer conductor is formed on an outer surface of the dielectric. A method of adjusting the characteristics of a resonator, wherein a recess is formed in advance in the vicinity of the inner conductor forming hole in at least one opening surface of the inner conductor forming hole, and an inner conductor formed near the recess forming portion is formed. It is characterized in that it is deleted to adjust the tip capacitance of the inner conductor.

According to a sixth aspect of the present invention, there is provided a dielectric resonator in which an inner conductor forming hole having an inner conductor formed on an inner surface is provided in a dielectric and an outer conductor is formed on an outer surface of the dielectric. A part of the inner conductor is removed in the vicinity of the opening surface of the inner conductor forming hole and at a position deeper than the opening surface.

According to a seventh aspect of the present invention, there is provided a dielectric resonator in which an inner conductor forming hole having an inner conductor formed on an inner surface is provided in a dielectric, and an outer conductor is formed on an outer surface of the dielectric. A narrowed portion is formed in at least one opening of the inner conductor forming hole, and the inner conductor near the narrowed portion and on the inner conductor forming hole side is deleted.

A dielectric resonator characteristic adjusting method according to an eighth aspect of the present invention is a dielectric body in which an inner conductor forming hole having an inner conductor formed on an inner surface is provided in a dielectric body, and an outer conductor is formed on an outer surface of the dielectric body. A method for adjusting the characteristics of a resonator, wherein a narrowed portion is formed in advance on one opening surface of the inner conductor forming hole, and the inner conductor formed in the narrowed portion is deleted to obtain a tip capacitance of the inner conductor. It is characterized by adjusting.

According to a ninth aspect of the present invention, there is provided a dielectric resonator in which an inner conductor forming hole having an inner conductor formed on an inner surface thereof is provided in a dielectric material, and an outer conductor is formed on an outer surface of the dielectric material. A narrowed portion is formed near one opening surface of the inner conductor forming hole and deeper than the opening surface, and the inner conductor of the narrowed portion is deleted.

A dielectric resonator characteristic adjusting method according to a tenth aspect of the present invention is a dielectric body in which an inner conductor forming hole having an inner conductor formed on an inner surface is provided in a dielectric body, and an outer conductor is formed on an outer surface of the dielectric body. A method for adjusting the characteristics of a resonator, wherein a narrowed portion is formed in advance near one opening surface of the inner conductor forming hole and at a position deeper than the opening surface, and the inner conductor formed in the narrowed portion is formed. It is characterized in that it is deleted to adjust the tip capacitance of the inner conductor.

[0018]

In the dielectric resonator according to claim 1 of the present invention,
An inner conductor non-forming portion is provided in the vicinity of at least one opening surface of the inner conductor forming hole of the dielectric resonator, and a signal input / output electrode capacitively coupled to the inner conductor is provided in a part of the outer conductor. In this way, a tip capacitance is generated in the portion where the inner conductor is not formed in the inner conductor forming hole, and combline coupling or interdigital coupling is performed between the resonator and the adjacent resonator. In this structure, the conductor on the opening surface of the inner conductor forming hole is not opened, and a large electromagnetic field leak does not occur. Moreover, since it is not necessary to provide the coupling hole, the entire size can be easily reduced.
Further, since the signal input / output electrode is provided in a part of the outer conductor and capacitively couples with the inner conductor, the signal input / output terminal as an individual component is unnecessary, and the outer conductor can be mounted on the circuit board by surface mounting. The signal input / output electrode can be connected to the signal line on the circuit board while being connected to the ground electrode on the circuit board.

In the dielectric resonator according to the present invention, the signal input / output electrode is formed only on the mounting surface for the circuit board. Therefore, with the dielectric resonator mounted on the circuit board, the electromagnetic field leakage of the signal input / output electrode section is reduced,
The change in the resonator characteristics due to the influence of the metal body in the peripheral portion is small, and unnecessary coupling with other circuit portions is eliminated, which facilitates the circuit design. Further, since it is only necessary to form the signal input / output electrodes in one plane, the pattern formation becomes easy.

In the dielectric resonator according to a third aspect of the present invention, one opening surface of the inner conductor forming hole is a short-circuit surface, a non-forming portion of the inner conductor is provided in the vicinity of the other opening surface, and one of the outer conductors is formed. Is provided with a signal input / output electrode that capacitively couples with the inner conductor, and a conductor and dielectric removed portion is formed on the opening surface where the inner conductor non-formation portion is provided or the short-circuit surface or a part of both surfaces thereof. ing. The resonance frequency of the resonator can be increased by removing a part of the conductor and the dielectric in the opening surface provided with the non-formed portion of the inner conductor. By removing the conductor and the dielectric between the openings of the inner conductor forming holes that are adjacent to each other on the short-circuit surface, it is possible to weaken the coupling between the resonators and lower the resonance frequency of the resonators. Further, for example, by removing the conductor and the dielectric around the inner conductor forming hole except between the openings of the adjacent inner conductor forming holes, the resonance frequency of the resonator can be lowered. Therefore, the coupling adjustment and the frequency adjustment can be easily performed without adding the conductor to the non-formed portion of the inner conductor.

In the dielectric resonator according to the present invention, a recess centering on the inner conductor forming hole is formed on at least one opening surface of the inner conductor forming hole of the dielectric resonator. The inner conductor in the vicinity has been deleted. Therefore, the open portion of the inner conductor is formed at a position deeper than the opening surface. Therefore, the open portion of the inner conductor occurs inside the opening surface of the inner conductor forming hole, the electromagnetic field leakage between the inside and outside of the dielectric resonator is improved, and stable resonator characteristics are obtained.

According to a fifth aspect of the present invention, there is provided a method for adjusting a characteristic of a dielectric resonator, wherein a recess is formed in advance on at least one opening surface of the inner conductor forming hole with the opening of the inner conductor forming hole as a center.
The inner conductor near the depression forming portion is deleted. By deleting the inner conductor in the vicinity of the recess forming portion in this manner, the inner edge of the inner conductor forming hole opening is not deleted, and the inner conductor and part of the dielectric can be deleted with high accuracy. it can.
As a result, the resonator characteristics can be adjusted with high precision, and desired resonator characteristics can be obtained easily and in a short time.

In the dielectric resonator according to the sixth aspect, a part of the inner conductor is removed in the vicinity of the opening surface of the inner conductor forming hole and at a position deeper than the opening surface. In this way, since the open part of the inner conductor is formed at a position deeper than the opening surface of the resonator, electromagnetic field leakage is suppressed.

In the dielectric resonator according to the present invention, the narrowed portion is formed on at least one opening surface of the inner conductor forming hole, and the inner conductor near the narrowed portion and on the inner conductor forming hole side is deleted. There is. Therefore, the open portion of the inner conductor is formed at a position deeper than the opening surface of the inner conductor forming hole, and the electromagnetic field leakage is suppressed.

In the characteristic adjusting method of the dielectric resonator according to the eighth aspect, the narrowed portion is previously formed in one opening of the inner conductor forming hole, and the inner conductor formed in the narrowed portion is deleted. The tip capacitance of the inner conductor is adjusted by. As described above, when the inner conductor previously formed in the narrowed portion is deleted, the inner conductor and the dielectric are deleted only in the narrowed portion, so that the adjustment can be accurately performed.

In the dielectric resonator according to the ninth aspect, the narrowed portion is formed near one opening surface of the inner conductor forming hole and at a position deeper than the opening surface, and the inner conductor of this narrowed portion is deleted. ing. Therefore, since the open portion of the inner conductor is formed at a position deeper than the opening surface of the inner conductor forming hole, electromagnetic field leakage is suppressed.

In the characteristic adjusting method for a dielectric resonator according to a tenth aspect of the present invention, the narrowed portion is formed in advance near the one opening surface of the inner conductor forming hole and at a position deeper than the opening surface, and is formed in the narrowed portion. The inner conductor that has been removed is removed, which adjusts the tip capacitance of the inner conductor. Since the inner conductor previously formed in the narrowed portion is deleted in this manner, highly accurate adjustment can be performed.

[0028]

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

FIG. 1 is a perspective view of a dielectric resonator. Figure 1
In FIG. 5, 5 and 6 are inner conductor forming holes provided in the substantially hexahedral dielectric block. Inner conductors are formed in advance on the inner surfaces of the inner conductor forming holes 5 and 6. The 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 through the inner conductor forming hole 6 in FIG. An inner conductor 3 is formed on the entire inner surface of the inner conductor forming hole 6 between the two openings. When obtaining a dielectric resonator having a predetermined characteristic from such a dielectric block, a part where the inner conductor is not formed (hereinafter referred to as an open part) is provided, and the resonance frequency and the degree of coupling are adjusted. Inner conductor forming holes 5, 6
Remove the inner conductor near one opening. 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 in the vicinity of the opening of the inner conductor forming hole, that portion becomes an open portion. FIG. 5 is a view of the dielectric resonator shown in FIG. 4 with the signal input / output electrode forming surface facing down, cut and separated at the horizontal plane in the center. For example, in 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 tip of the inner conductor 2 and the signal input / output electrode 9. .. In this way, the tip capacitance is adjusted by the dimension S shown in FIG. 3, whereby the resonance frequency of the resonator and the coupling degree 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 in the open part of each inner conductor.
Further, 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 the structure of the dielectric resonator according to the second embodiment in which the opening forming position is different in the inner conductor forming hole. 7A is a central horizontal sectional view of the dielectric block, and FIG. 7B is a front view seen from the short-circuit surface side of the dielectric block. In this way, the open portions of the inner conductors 2 and 3 provided in the inner conductor forming hole are provided at positions 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 the dielectric resonator according to the third embodiment, in which the resonance frequency and the degree of coupling are adjusted by providing the conductor and the deleted portion of the dielectric on a part of the short-circuited surface, is shown in FIG.
Shown in. FIG. 8 is a front view as seen from the short-circuit surface side, and C, D
Is a removed portion of the conductor and the dielectric on the short-circuited 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 lowered. Similarly, if the conductor and the dielectric are partially removed in the region S2, the resonance frequency of the resonator formed by the inner conductor forming hole 6 is lowered. On the other hand, if the conductor and the dielectric are partially removed in the region of S12, the degree of coupling between the two resonators is reduced. Here, examples of changes in the coupling coefficient due to the removal of the conductor and the dielectric are shown in FIGS. As shown in Figure 9,
A conductor deletion 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 coupling coefficient change ratio when the coupling coefficient when S = 0 is Ko and the coupling coefficient after conductor removal is Ka. In this way, the coupling coefficient can be adjusted by the conductor removal area between the inner conductor forming holes on the short-circuit surface. An example of adjusting the resonance frequency is shown in FIGS. 10 and 12. As shown in FIG. 10, a conductor deletion portion having a width f and a length g was provided at a position apart from the inner conductor forming hole by a certain distance, and the resonance frequency was measured when the length g was changed. In FIG. 10, a =
2.0 mm, e = 3.0 mm, 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 with reference to the resonance frequency when g = 0. In this way, the resonance frequency can be adjusted by deleting the conductor around the inner conductor forming hole in 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-circuited surface, but if the conductor and the dielectric on the opening surface on the inner conductor non-formation side are deleted, the capacitance is reduced. C
Since s decreases, the resonance frequency can be adjusted in the higher direction.

Further, in the examples shown in FIGS. 8 to 12, the two-stage dielectric resonator is taken as an example, but the present invention can be similarly applied to the three-stage or more dielectric resonators. In this case,
As shown in FIG. 3, the degree of coupling between the resonators is adjusted by partially deleting the conductor and the dielectric in the regions S12, S23, ... S _{n-1 n} between the openings of the inner conductor forming holes on the short-circuit surface. However, the resonance frequency of each resonator can be adjusted by partially deleting the conductor and the dielectric in the regions S1, S2, S3, ... Sn.

Next, a fifth signal input / output electrode having a different shape is used.
1 is a perspective view showing the structure of the dielectric resonator according to the embodiment of FIG.
4 shows. In FIG. 14, reference numerals 16, 17, and 18 denote inner conductor forming holes, and inner conductors and open portions are formed on the inner surface thereof. 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 with the inner conductor in the inner conductor forming hole 16, and the electrode 10 is capacitively coupled with the inner conductor in the inner conductor forming hole 18. When mounting this dielectric resonator on a circuit board, the upper surface in the figure is surface-mounted so as to face the circuit board.

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

FIG. 15 is an exploded perspective view of the dielectric resonator. In FIG. 15, 1a and 1b are dielectric substrates, respectively. Two grooves each having a semicircular cross section are formed on one main surface of each of the dielectric substrates 1a and 1b, and an inner conductor is formed on the inner surface thereof. 2b and 3b are dielectric substrates 1b
It is an inner conductor provided on the side. Recesses 7a, 8a, 7b and 8b are formed in one opening of the grooves of the dielectric substrates 1a and 1b, respectively. The outer conductor 4a is provided on the main surface and 4 side surfaces of the dielectric substrate 1a facing the inner conductor forming surface, and the outer conductor 4b is provided on the main surface and 4 side surfaces of the dielectric substrate 1b facing the inner conductor forming surface. There is. Further, the signal input / output electrodes 9 and 10 are formed in a part of the formation region of the outer conductor 4a of the dielectric substrate 1a.

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

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

However, in order to avoid complication of 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).

18 and 19 are two examples in which an open portion is formed in a part of the inner conductor and the resonator characteristics are adjusted. In FIG. 18, A is a part where parts of 3a and 3b are deleted in the vicinity of the recess forming part. Specifically, a grinding tool such as a lutor equipped with a grindstone having a shape shown in 11 is used. By deleting a part of the inner conductor in this manner, the deleted portion is made an open portion. Since the removed portion A of the inner conductor is formed at a position deeper than the opening face F, electromagnetic field leakage from the opening face 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 exists in the vicinity of the opening surface F, the characteristics are not disturbed by the influence of the metal body. When the adjustment is performed by using the luteer as shown in FIG. 18, the inner conductor 3 is
The amount of deletion of a and 3b is controlled, and the tip capacity is adjusted by this. If the tip capacitance changes, the resonator frequency and the degree of coupling with the adjacent resonators change, so that the predetermined resonator characteristics can be obtained by adjusting the insertion depth of the router into the inner conductor forming hole. As shown in FIG. 18, since the tip capacitance formed in 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. 19
In B, a portion where the dielectric is removed together with the inner conductor in the vicinity of the recess forming portion. In order to grind the dielectric material together with the inner conductor in this manner, 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 predetermined amount by inserting the luteter in the axial direction from the recess forming portion in alignment with the center axis of the inner conductor forming hole.

Next, FIG. 20 shows a sectional view of a dielectric resonator according to the seventh embodiment. In FIG. 20, A and B show the deleted portions of the inner conductor. As described above, 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 electromagnetic field leakage is solved. In order to form and adjust such an open portion, it is sufficient to use a luteer having a grindstone with a relatively small diameter attached thereto, insert it obliquely from the open portion, and perform boring work. At that time, a part of the dielectric is ground together, and the tip capacitance can be adjusted by the depth thereof.

Next, the structure of the dielectric resonator according to the eighth embodiment and the characteristic adjusting method 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 thereof 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 opening 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. Furthermore, the diaphragm 11
A conductor film is also formed on the inner surface of the continuous conductor from the inner conductor to the outer conductor.

FIG. 22 is a diagram showing an example of a method of forming and adjusting the open portion. In FIG. 22, A is a deleted portion of the inner conductor and the dielectric. In this way, by removing a part of the inner conductor on the inner conductor forming hole side of the narrowed portion 13, the 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, the grinder of the lute is inserted from the open part of the inner conductor forming hole where the throttle part is not formed, and the amount of grinding depends on the insertion depth. Adjust.
The rate of change of the tip volume with respect to the amount of grindstone insertion differs depending on the tip shape of the grindstone. In consideration of efficiency and accuracy of characteristic adjustment, a grindstone having a shape as shown in FIG. 23 or 24 may be used.

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

FIG. 25 shows one of the substrates 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 which face the inner conductor. A dielectric resonator is formed by facing and bonding substrates having the same shape as this substrate.

FIG. 26 is a sectional view thereof. In FIG. 26, 15a and 15b form a narrowed portion in a part of the inner conductor forming hole. In a dielectric resonator having such a narrowed portion in a part of the inner conductor forming hole, as shown in FIG. 27, the inner conductor forming hole is formed in order to form an open portion in the inner conductor and adjust the characteristics. The inner conductor formed on the inner surface of the diaphragm is removed from one opening surface using a lute or the like.
In FIG. 27, A indicates the deleted portion. In this way, since the open portion of the inner conductor is formed at a position recessed from the opening surface, electromagnetic field leakage is suppressed. Further, since the grinding range by the lute 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, two dielectric substrates are superposed, but the structure and the characteristic adjusting method of the sixth to ninth embodiments are the same as those of the sixth to ninth embodiments. The same can be applied to the integrated dielectric resonator in which the inner conductor forming hole is provided in the single dielectric block as in the first to fifth embodiments. Further, in the structure and the characteristic adjusting method as in the first to fifth embodiments, as in the sixth to ninth embodiments, two dielectric substrates are superposed and an inner conductor forming hole is provided inside. The same can be applied to the dielectric resonator described above.

Further, in the embodiment, the comb line type dielectric resonator is used as an example, but the interdigital type resonator can be similarly applied.

[0053]

According to the dielectric resonators according to claims 1 and 2 of the present invention, since the signal input / output electrode is provided in a part of the outer conductor, there is no need to use a special individual signal input / output terminal. It can be surface-mounted on a circuit board. In addition, since the conductor exists on the opening surface of the inner conductor forming hole and is not an open surface, electromagnetic field leakage is small, and even if it is mounted on the circuit board as it is, the effect of electromagnetic field leakage is small.

According to the dielectric resonator of the third aspect of the present invention, the dielectric resonator in which the resonance frequency of the resonator and the coupling coefficient between the resonances are adjusted without adding the conductor to the non-formed portion of the inner conductor. Is obtained.

According to the dielectric resonators of the fourth, sixth, seventh and ninth aspects, since the open portion of the inner conductor is formed at a position deeper than the opening surface of the inner conductor forming hole, it is caused by electromagnetic field leakage. Has little effect. Therefore, there is no coupling between the resonator and other objects or circuits near the resonator, and stable resonator characteristics can be obtained.

According to the dielectric resonator characteristic adjusting method of the fifth, eighth, and tenth aspects, the locations where the inner conductor and the dielectric are deleted are limited, and only the grinding tool is moved in the axial direction of the inner conductor forming hole. Thus, the tip end capacitance can be easily adjusted by providing an opening part in a part of the inner conductor and adjusting the movement amount thereof. Moreover, since the tip capacitance 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 used. Can be easily obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a dielectric resonator according to a first embodiment which is being manufactured.

FIG. 2 is a cross-sectional view of the dielectric resonator according to the first embodiment which is being manufactured.

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

FIG. 4 is a perspective view of a 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.

7A and 7B are diagrams showing a structure of a dielectric resonator according to a second embodiment, where 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 a conductor deletion example for measuring characteristics of a dielectric resonator according to a third embodiment.

FIG. 10 is a partial front view showing a conductor deletion example for measuring characteristics of the dielectric resonator according to the third embodiment.

FIG. 11 is a diagram showing measurement results of changes in coupling coefficient of the dielectric resonator according to the third example.

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

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 example.

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

FIG. 23 is a diagram showing the shape of a grindstone.

FIG. 24 is a diagram showing the shape of a grindstone.

FIG. 25 is a perspective view of one dielectric substrate that constitutes 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 cross-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-Dimple 9,10-Signal input / output electrode 11-Luter 13,14,15-Throttle part A, B-Deleted part (inner conductor non-formed part) C, D-Deleted part F -Open surface

Front page continued (72) Inventor Hideyuki Kato 2 26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Inventor Hisashi Mohri 2-10-10 Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd.

Claims (10)

[Claims] 1. A dielectric resonator in which a plurality of inner conductor forming holes are provided in a dielectric body, and an outer conductor is formed on an outer surface of the dielectric body, in the vicinity of at least one opening surface of the inner conductor forming hole. A dielectric resonator comprising a non-formed portion of an inner conductor and a signal input / output electrode capacitively coupled to the inner conductor in a part of the outer conductor. 2. The dielectric resonator according to claim 1, wherein the dielectric has a substantially hexahedral shape, and the signal input / output electrodes are formed only on a circuit board mounting surface. 3. A dielectric resonator in which a plurality of inner conductor forming holes are provided in a dielectric body and an outer conductor is formed on an outer surface of the dielectric body, wherein one opening surface of the inner conductor forming hole is a short-circuit surface. In addition, a non-formed portion of the inner conductor is provided in the vicinity of the other opening surface, and a signal input / output electrode that capacitively couples with the inner conductor is provided in a part of the outer conductor, and the short circuit surface, the other opening surface, or both surfaces thereof. A dielectric resonator, wherein a conductor and a deleted portion of a dielectric are formed in a part of the. 4. A dielectric resonator in which an inner conductor forming hole having an inner conductor formed on an inner surface thereof is provided in a dielectric, and an outer conductor is formed on an outer surface of the dielectric, wherein at least one opening of the inner conductor forming hole is formed. A dielectric resonator in which a recess is formed in the surface in the vicinity of the inner conductor forming hole, and the inner conductor in the vicinity of the recess forming portion is deleted. 5. A method for adjusting the characteristics of a dielectric resonator, comprising forming an inner conductor forming hole having an inner conductor formed on the inner surface of a dielectric body, and forming an outer conductor on the outer surface of the dielectric body. A recess is formed in advance in the vicinity of the inner conductor forming hole on at least one opening surface of the forming hole, and the inner conductor formed near the recess forming portion is deleted to adjust the tip capacitance of the inner conductor. And a method for adjusting the characteristics of a dielectric resonator. 6. A dielectric resonator in which an inner conductor forming hole having an inner conductor formed on the inner surface is provided in a dielectric body, and an outer conductor is formed on the outer surface of the dielectric body, in the vicinity of an opening surface of the inner conductor forming hole. In addition, a dielectric resonator formed by removing a part of the inner conductor that is deeper than the opening surface. 7. A dielectric resonator in which an inner conductor forming hole having an inner conductor formed on the inner surface is provided in a dielectric, and an outer conductor is formed on the outer surface of the dielectric, wherein at least one opening of the inner conductor forming hole is formed. A dielectric resonator formed by forming a narrowed portion in the portion and removing an inner conductor near the narrowed portion and on the inner conductor forming hole side. 8. A method for adjusting a characteristic of a dielectric resonator, comprising: forming an inner conductor forming hole having an inner conductor formed on an inner surface of a dielectric body; and forming an outer conductor on an outer surface of the dielectric body. A narrowed portion is formed in advance on one opening surface of the forming hole, the inner conductor formed in the narrowed portion is deleted, and the tip capacitance of the inner conductor is adjusted. Characteristic adjustment method. 9. A dielectric resonator in which an inner conductor forming hole having an inner conductor formed on an inner surface thereof is provided in a dielectric, and an outer conductor is formed on an outer surface of the dielectric, wherein one opening surface of the inner conductor forming hole is formed. A dielectric resonator in which a narrowed portion is formed in the vicinity and deeper than the opening surface, and an inner conductor of the narrowed portion is removed. 10. A method for adjusting a characteristic of a dielectric resonator, comprising: forming an inner conductor forming hole having an inner conductor formed on an inner surface of a dielectric body; and forming an outer conductor on an outer surface of the dielectric body. To adjust the tip capacitance of the inner conductor by forming a narrowed portion in advance near one opening surface of the forming hole and at a position deeper than the opening surface, deleting the inner conductor formed in the narrowed portion. And a method for adjusting the characteristics of a dielectric resonator.