JPH09307319A - Dielectric coaxial resonator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dielectric coaxial resonator of a small size and high non-load Q by a simple manufacturing process in the dielectric coaxial resonator used by various radio communication equipments, etc. SOLUTION: Plural grooves 13 and 14 are provided at the opening part of a hollow dielectric 11 and conductors 13a and 14a are formed at or in the neighborhood of the groove 13 and 14 to connect with a conductor 12a formed at or in the neighborhood of a through hole 12 provided at the hollow part of the dielectric 11 to form a central conductor 15 and to form an external conductor 16 at the outer peripheral part of the dielectric 11. Then the length of the through hole 12 provided at the hollow part of the dielectric 11 is made shorter than the full length of the outer peripheral part of the dielectric 11 to obtain the dielectric coaxial resonator of a small size and high non-load Q.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric coaxial resonator used in frequencies such as several hundred MHz used in various wireless communication devices and broadcasting devices.

[0002]

2. Description of the Related Art In recent years, wireless devices used in the field of mobile communication or broadcasting have been rapidly reduced in size and weight. As described above, a coaxial resonator using a dielectric material having a high dielectric constant and low loss is widely used for a resonator and a filter used in a wireless device that is required to be small and lightweight. This dielectric coaxial resonator uses not only a dielectric material having a large relative permittivity but also a characteristic impedance of a line.
The shape of the resonator has also been reduced by devising the shape of the resonator, such as changing the dance into steps.

[0003] A conventional dielectric coaxial resonator will be described below. FIG. 7 shows a conventional dielectric coaxial resonator, which is shown in FIG.
Shows a sectional view taken along a plane including the central conductor, and FIG. 7B shows a side view seen from the open end. In FIG. 7, 1 is a hollow dielectric having a through hole 2, 3 is a groove formed at an open end, 4 is a central conductor formed by connecting a conductor 4a provided between the through hole 2 and the groove 3, Reference numeral 5 is an outer conductor.

The operation of the dielectric coaxial resonator configured as described above will be described below.

In the above structure, in the dielectric coaxial resonator having the groove 3 at the open end to form a conductor and the central conductor 4 connected to the conductor formed in the through hole 2, the groove 3 and the central conductor 4 are provided. Groove along with the inductance component of the line consisting of
By taking into consideration the capacitance component of the line formed by the outer conductor 5 and the outer conductor 5, the size of the resonator can be reduced.

In this way, the groove 3 is provided on the open end surface and the conductor 3a is formed.
To form the central conductor 4 by connecting the conductor formed in the through hole 2 to the central conductor 4, and to increase the inductance component of the central conductor 4 and to add the capacitive component formed between the groove 3 and the outer conductor 5. To reduce the size of the resonator.

[0007]

However, in the above-mentioned conventional structure, when the resonator length is further shortened, the inductance due to the groove formed at the open end and the line composed of the central conductor is increased, and at the same time, the groove is increased. It is necessary to increase the capacitance component due to the line composed of
Since the groove depth is limited due to processing restrictions, a large shortening effect cannot be expected. Moreover, if multiple grooves are formed to reduce the resonator length, the ratio of exposure to the open end of the center conductor increases, so that the electric field component near the open end spreads out of the outer conductor, and There was a problem that the no-load Q, which is a performance index, deteriorates.

Further, when adjusting the resonance frequency, the dielectric material and the outer conductor at the open end are cut off. However, since the open end and the central conductor are in the same plane, they are axisymmetric. It is difficult to adjust the resonance frequency while maintaining the structure. Therefore, the electromagnetic field distribution is not axially symmetrical and uniform, and there is a problem that adjustment of the resonance frequency causes deterioration of the no-load Q.

The present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to realize a small size and high Q of a dielectric coaxial resonator used at frequencies such as the VHF band.

[0010]

In order to achieve this object, the present invention provides a plurality of grooves in an opening of a hollow dielectric body, a conductor is formed in the groove, and is provided in the hollow portion of the dielectric body. A central conductor is formed by connecting to the conductor formed in the through hole, and the length of the through hole provided in the hollow portion of this dielectric is made shorter than the total length of the outer peripheral portion of the dielectric, and the through hole and multiple grooves are formed. A central conductor to which the formed conductors are connected is formed inside an outer conductor to form a dielectric coaxial resonator.

Further, the conductor connecting portion connecting the plurality of grooves forming the central conductor or connecting the through hole and the groove is formed so that the shape thereof gradually changes.

The resonance frequency is adjusted by uniformly cutting the outer peripheral dielectric and the outer conductor at the open end while maintaining the axially symmetrical structure.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention relates to a hollow dielectric body, a plurality of grooves in which conductors are formed in an opening of the dielectric body, and a hollow portion of the dielectric body. A center conductor having a through hole shorter than the entire length of the outer circumference of the dielectric is provided, and an outer conductor provided at the outer circumference of the dielectric.

The invention according to claim 2 of the present invention is
A hollow dielectric, a plurality of grooves in which a conductor is formed in the opening of the dielectric, a central conductor in which a through hole shorter than the entire length of the outer circumference of the dielectric is formed in the hollow of the dielectric, An outer conductor provided on the outer peripheral portion of the dielectric body, a short-circuited end provided on one end face, and an open end provided on the other end face of the short-circuited end.

The invention according to claim 3 of the present invention provides:
A hollow dielectric, a plurality of grooves in which a conductor is formed in the opening of the dielectric, a central conductor in which a through hole shorter than the entire length of the outer circumference of the dielectric is formed in the hollow of the dielectric, The outer conductor is provided on the outer peripheral portion of the dielectric, and the open end portions are provided on both end surfaces.

According to the present invention, with the above structure, a line formed in a through hole provided in a hollow dielectric is loaded with a plurality of lines short-circuited at one end formed by a deep groove provided in the opening, that is, Since the length is shorter than a quarter wavelength, a plurality of inductance components are loaded in series, the impedance of the line formed at the open end is lowered, and a large capacitance component is added to significantly increase the resonance frequency. It is possible to lower it. That is, since the increase in the inductance component and the increase in the capacitance component can be realized even under the condition that the resonator length is constant, it is possible to significantly reduce the size of the resonator when the resonance frequency is constant. Moreover, since the central conductor formed by connecting the conductors formed in the through holes and the plurality of grooves is formed inside the outer conductor, the electric field is prevented from spreading outside the outer conductor and a high no-load Q is secured. It will be possible.

Further, since the size of the resonator can be reduced, the higher-order resonance frequency is also different from the odd multiple of the fundamental frequency, and when applied to the output filter of the nonlinear circuit such as the power amplifier, the harmonic of the odd multiple of the fundamental frequency is generated. Can be suppressed.

Since the opening area of the opening is large,
There are many processing advantages such as the processing and manufacturing of the groove formed in the opening, such as the formation of a deep groove effective for shortening the resonator length, can be performed easily.

The invention according to claim 4 of the present invention is
The groove is characterized in that the opening area decreases as the depth increases from the opening.

The invention according to claim 5 of the present invention is
The groove is characterized in that it is formed parallel to the outer peripheral portion of the dielectric.

The invention according to claim 6 of the present invention is
The groove is characterized by being formed concentrically with the outer peripheral portion of the dielectric.

The invention according to claim 7 of the present invention is
The dielectric is a rectangular parallelepiped, the through hole is a cylinder, and the connecting portion between the groove and the through hole is a quadrangular pyramid.

The invention according to claim 8 of the present invention is
The dielectric is a rectangular parallelepiped, the through hole is a cylinder, and the connecting portion between the groove and the through hole is conical.

The invention according to claim 9 of the present invention is
The dielectric is a cylinder, the through hole is a cylinder, and the connecting portion between the groove and the through hole is conical.

Further, the invention according to claim 10 of the present invention is characterized in that a portion having a uniform characteristic impedance at the connecting portion of the conductor formed between the groove and the through hole formed in the dielectric is provided. It is a thing.

Further, the invention according to claim 11 of the present invention is, in the opening of the dielectric, a plurality of grooves formed in the dielectric, a central conductor formed by connecting the plurality of grooves and through holes, and an outer conductor. It is characterized by rounding the corners of the.

According to the above invention, the deeper groove can be formed by gradually changing the shape of the connection between the plurality of grooves or between the through hole and the groove. Not only can the shortening be promoted, the conductor formed in the groove can be prevented from peeling off, and the disturbance of the electromagnetic field distribution due to the discontinuity of the connection portion can be alleviated, and the deterioration of the no-load Q can be prevented.

The invention according to claim 12 of the present invention is characterized in that the outer peripheral portion of the dielectric and the outer conductor provided on the outer peripheral portion are shaved.

According to the above invention, the resonance frequency is adjusted by uniformly scraping the dielectric and the outer conductor at the open end where the outer conductor longer than the center conductor is formed. Since the frequency can be adjusted up to this point and the electromagnetic field distribution is also axisymmetric and uniform, the resonance frequency can be adjusted without deterioration of the no-load Q.

As described above, the length of the through hole is made shorter than the total length of the dielectric to widen the opening area of the opening, and a plurality of grooves are formed in the opening to form a conductor formed in the through hole. , And a central conductor is formed to confine it inside an outer conductor to form a resonator having a coaxial structure, whereby a compact, high-load dielectric coaxial resonator having harmonic suppression characteristics and high unloaded Q Is feasible.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6. (Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings.

FIG. 1 shows a dielectric coaxial resonator according to the first embodiment of the present invention, FIG. 1 (a) is a sectional view taken along a plane including a central conductor, and FIG. 1 (b) is an open end. The side view seen is shown.

In FIGS. 1 (a) and 1 (b), 11 is a hollow dielectric having a through hole 12, 13 and 14 are grooves formed in an opening, and 15 is a through hole 12, grooves 13 and 14 and the same. A central conductor 16 is formed by connecting conductors 12a, 13a and 14a provided in the vicinity, and 16 is an outer conductor.

The operation of the dielectric coaxial resonator configured as described above will be described below.

As the dielectric coaxial resonator, one having a uniform characteristic impedance in which one end is open and one end is short is widely used, and the length thereof is a quarter wavelength, but the groove 1 is formed in the opening.
3 and 14 are provided to form the conductors 13a and 14a, and the central conductor 15 is formed by connecting to the conductor 12a provided in the through hole 12 in the hollow portion, and between the conductors provided in the through hole 12 and the groove 13 and Since short-circuit lines are formed at one end between the conductors provided in the grooves 13 and 14, and these inductance components are connected in series, the center conductor 1
As the inductance component of No. 5 increases, the capacitance component of the open end by the conductor 14a provided in the groove 14 and the outer conductor 16 and the open end by the low impedance line is added, and the resonance frequency can be reduced. Further, if the resonance frequency is constant, the size of the resonator can be reduced.

Further, since the resonator length can be made shorter than a quarter wavelength, the higher-order resonance frequency is different from an odd multiple of the fundamental frequency, and when applied to an output filter of a non-linear circuit such as a power amplifier, it has an odd fundamental frequency. It becomes an effective means to suppress double harmonics.

Further, by making the length of the through hole 12 shorter than the entire length of the outer peripheral portion of the dielectric and widening the opening, the groove formed in the opening effective for shortening the resonator length is deepened. processing,
It can be easily manufactured and the resonator can be significantly shortened.

By forming the central conductor 15 composed of the through hole 12 and the plurality of grooves inside the outer conductor 16, the electric field is prevented from spreading to other than the outer conductor 16 and a high unloaded Q is provided. A dielectric coaxial resonator can be realized.

Further, the resonance frequency is adjusted by removing the dielectric 11 and the outer conductor 16 at the open end where the outer conductor 16 longer than the center conductor 15 is formed, so that the resonator shape remains axially symmetric and the frequency is adjusted. Since the electromagnetic field distribution is axially symmetrical and uniform, the resonance frequency can be adjusted without deterioration of the no-load Q.

As described above, according to the first embodiment of the present invention, the through hole 12 is formed in the opening by making the length of the through hole 12 shorter than the entire length of the outer peripheral portion of the dielectric 11 and widening the opening. The plurality of grooves 13 and 14 are easily processed and manufactured, and the through hole 12, the plurality of grooves 13 and 14 and the conductors 12a, 13a and 14a provided in the vicinity thereof are connected to each other to connect the central conductor 1
5 is formed inside the outer conductor 16, the resonator length can be shortened and the electric field can be prevented from spreading to other than the outer conductor 16. Therefore, the dielectric having a small and high unloaded Q can be obtained. A body coaxial resonator can be realized. Further, the frequency can be adjusted without breaking the axisymmetric structure.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a dielectric coaxial resonator according to the second embodiment of the present invention. FIG. 2 (a) is a sectional view taken along a plane including a center conductor, and FIG. 2 (b) is an open end. The side view seen is shown.

2 is different from that of FIG. 1 in that
This is a structure in which both ends are open rather than one end open and one end short-circuited, and the dielectric has a prismatic structure.

In FIGS. 2A and 2B, 21 is a hollow dielectric having a through hole 22, 23 and 24 are grooves formed in openings at both ends, and 25 is a through hole 22, grooves 23 and 24, and A central conductor formed by connecting the conductors 22a, 23a, and 24a provided in the vicinity thereof, and 26 are outer conductors.

The operation of the dielectric coaxial resonator configured as described above will be described below.

The structure is such that the one end of the cylindrical shape shown in FIG.
Unlike the dielectric coaxial resonator having the short-circuited structure at one end, the structure is a prismatic structure with both ends open, and the resonator length is longer than that of the first embodiment. However, since the basic resonator structure is the same, one end described in the first embodiment is used. The same characteristics and effects as those of the dielectric coaxial resonator having the open and short-circuited ends can be obtained.

However, a half-wavelength resonator having an open-ended structure and a uniform characteristic impedance resonates even at an integral multiple of the fundamental resonance frequency, whereas this resonator has a resonator length of Since the wavelength can be made shorter than the half wavelength, the higher resonance frequency can be shifted from an integral multiple.

Further, by forming the dielectric 21 into a prismatic structure, when mounting on a substrate or when manufacturing a filter, positioning can be surely performed and handling becomes easy.

(Third Embodiment) A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a dielectric coaxial resonator according to the third embodiment of the present invention, FIG. 3 (a) is a sectional view taken along a plane including a central conductor, and FIG. 3 (b) is an open end. The side view seen is shown.

In FIGS. 3A and 3B, the difference from the configuration of FIG. 1 is that two grooves provided in the opening are formed on both sides.
The point is that the dielectric is formed into a prismatic structure while being formed into a pear shape.

Reference numeral 31 is a hollow dielectric having a through hole 32, 33 and 34 are grooves formed in the opening, and 35 is a through hole 3.
2, a central conductor formed by connecting the taper-shaped grooves 33, 34 and conductors 32a, 33a, 34a provided in the vicinity thereof, 36
Is an outer conductor.

The operation of the dielectric coaxial resonator configured as described above will be described below.

The structure is the same as that of the dielectric coaxial resonator of the one-end open and one-end short-circuit structure shown in FIG. 1, but since the dielectric shape is a prismatic structure, it is the same as that of the second embodiment shown in FIG. Easy to handle. Also, the structure of the opening is
Since it is basically the same as that of the first embodiment shown in FIG. 1, the same characteristics and effects as those of the dielectric coaxial resonator having the one-end open and one-end short-circuit structure described in the first embodiment can be obtained.

In this embodiment, since the grooves 33 and 34 are tapered, it becomes easy to deepen the grooves, and a plurality of coaxial portions can be lengthened, so that the resonator can be miniaturized. Can be further promoted. Further, it is possible to prevent peeling of the conductor film, which is likely to occur at the corners of the groove.

As described above, since the plurality of grooves 33, 34 formed in the opening are tapered, that is, their shape is gradually changed, the depth can be deepened and the conductor film can be peeled off. And it is possible to realize a compact dielectric coaxial resonator having a high unloaded Q.

(Fourth Embodiment) Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings.

FIG. 4 shows a dielectric coaxial resonator according to a fourth embodiment of the present invention, FIG. 4 (a) is a sectional view taken along a plane including a center conductor, and FIG. 4 (b) is a sectional view from an open end. The side view seen is shown.

4 is different from the configuration of FIG. 3 in that
The point is that the taper on one side surface of the groove adjacent to the outer conductor is removed from the plurality of grooves provided in the opening.

Reference numeral 41 is a hollow dielectric material having a through hole 42. Reference numerals 43 and 44 are grooves formed in the openings, and the taper on one side surface of the groove 44 adjacent to the outer conductor is removed. Four
5 is a central conductor formed by connecting the through holes 42, the grooves 43, 44 and the conductors 42a, 43a, 44a formed in the vicinity thereof,
46 is an outer conductor.

The operation of the dielectric coaxial resonator configured as described above will be described below.

Since this embodiment also has a structure basically similar to that of the first embodiment shown in FIG. 1, the dielectric coaxial resonance of the one-end open, one-end short-circuit structure described in the first embodiment. The same characteristics and effects as the container can be obtained.

Further, the conductor 43a on the side of the through hole 12 in the groove 43 forming the plurality of coaxial portions of the central conductor 45 and the conductor 44a on the side of the groove 43 in the groove 44 are made into a taper shape. Similarly, it is possible to suppress the peeling of the films of the conductors 43a and 44a that tend to occur at the corners, and it becomes easy to process the deep groove.

One side surface of the groove 44 (on the side of the outer conductor 45)
Since the taper of the conductor 44a is removed and the thickness with the outer conductor 45 is thinned in (1), the capacitance component of this portion can be increased, so that the size of the resonator can be further promoted. Is.

(Fifth Embodiment) The fifth embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 shows a dielectric coaxial resonator according to the fifth embodiment of the present invention. FIG. 5 (a) is a sectional view taken along a plane including a central conductor, and FIG. 5 (b) is an open end. The side view seen is shown.

5 is different from the configuration of FIG. 4 in that
This is a point in which the shape (groove shape) of the opening of the central conductor formed by connecting the through holes and the conductors provided in the plurality of grooves is conical.

In FIGS. 5A and 5B, 51 is a hollow dielectric having a through hole 52, 53 and 54 are grooves formed in the opening, 55 is a through hole 52 and a conical groove 53, 5
4 and a central conductor formed by connecting the conductors 52a, 53a, and 54a provided in the vicinity thereof, and 56 is an outer conductor.

The operation of the dielectric coaxial resonator configured as described above will be described below.

Since this embodiment also has a structure basically similar to that of the first embodiment shown in FIG. 1, the dielectric coaxial resonance having the one-end open and one-end short-circuit structure described in the first embodiment. The same characteristics and effects as the container can be obtained.

Further, a plurality of grooves 53, 5 provided in the opening.
4 and the through hole 52 are connected, and the shape of the formed central conductor 55 at the plurality of coaxial portions is made into a conical shape.
By reducing the angled portions in the film forming portions of 3a and 54a, the occurrence of peeling of the conductive film which tends to occur at the corners is suppressed,
The unloaded Q of the resonator is improved.

(Sixth Embodiment) The sixth embodiment of the present invention will be described below with reference to the drawings.

FIG. 6 is a dielectric coaxial resonator according to the sixth embodiment of the present invention, FIG. 6 (a) is a sectional view taken along a plane including a central conductor, and FIG. 6 (b) is a sectional view from an open end. The side view seen is shown.

6 is different from that of FIG. 5 in that
The point is that the through hole and the plurality of grooves are connected to each other, and the opening of the formed central conductor has the same shape.

In FIGS. 6A and 6B, 61 is a hollow dielectric having a through hole 62, 63 and 64 are grooves formed in the openings, and 65 is the through holes 62, grooves 63 and 64, and the holes thereof. The central conductor 66 is formed by connecting the conductors 62a, 63a, 64a provided in the vicinity, and 66 is an outer conductor.

The operation of the dielectric coaxial resonator configured as described above will be described below.

Since this embodiment basically has the same structure as that of the first embodiment shown in FIG. 1, the dielectric coaxial resonance having the one-end open and one-end short-circuit structure described in the first embodiment. The same characteristics and effects as the container can be obtained.

Further, the grooves 63, 64 provided in the opening are connected to the through hole 62, and the surface of the opening of the formed central conductor 65 has a quadrangular pyramid shape, but the corner is rounded, The angled portions of the film forming portions of the conductors 62a, 63a, 64a are reduced to suppress the peeling of the conductor film, which is likely to occur at the corners, and improve the no-load Q of the resonator.

Further, when the characteristic impedance of the central conductor 65 in the plurality of coaxial portions is made uniform so that a filter or the like is formed by using this resonator, a substrate for securing the coupling between the resonators is mounted. In addition to providing a favorable structure, the electromagnetic field distribution is uniform, so that the resonator has no load Q.
It is effective in preventing deterioration.

In the first to sixth embodiments, the number of grooves formed in the opening is two, but it goes without saying that the number is not limited to two. .

In the third to sixth embodiments, the outer conductor has a square shape with one end open and one end shorted, but the dielectric coaxial resonator may have a circular shape or a rectangular shape. Further, in Embodiments 3 to 6, one end is opened,
An example of a dielectric coaxial resonator having a short-circuit structure at one end has been shown, but it goes without saying that the present invention can also be applied to a dielectric coaxial resonator having both ends open as in the second embodiment.

[0082]

As described above, according to the present invention, the length of the through hole formed in the hollow dielectric is processed to be shorter than the entire length of the outer peripheral portion of the dielectric, and the opening is widened. By facilitating the processing and manufacturing of the groove formed in the opening such as the deep groove, forming the conductor in the through hole and the plurality of grooves and connecting them to form the central conductor, and by configuring this portion in the multiple coaxial structure. ,
A useful dielectric coaxial resonator having a shortened resonator length and a shift characteristic from an integer multiple of a higher resonance frequency is realized.

Further, by forming the center conductor inside the outer conductor to prevent the electric field at the open end from spreading outside the outer conductor, a dielectric coaxial resonator having a high unloaded Q is realized. It is possible.

Further, by forming the connecting portion between the through hole and the groove so that the shape thereof gradually changes, the electromagnetic field distribution is made uniform and the peeling of the conductive film, which is likely to occur at the corners, is eliminated. It is possible to prevent the deterioration of the unloaded Q of the resonator.

Further, the resonance frequency is adjusted by uniformly cutting the dielectric and the outer conductor at the open end where the outer conductor longer than the center conductor is formed, so that the frequency can be adjusted while the resonator shape remains axisymmetric. Since it is possible and the distribution of the electromagnetic field is also axisymmetric and uniform, the resonance frequency can be adjusted without deterioration of the no-load Q.

As described above, according to the present invention, it is possible to realize an excellent dielectric coaxial resonator having a harmonic suppression characteristic and a small size and a high Q by a simple manufacturing process.

[Brief description of drawings]

FIG. 1A is a sectional view of the dielectric coaxial resonator according to the first embodiment of the present invention taken along a plane including a center conductor. FIG. 1B is an open end of the dielectric coaxial resonator according to the first embodiment of the present invention. Side view seen from

FIG. 2 (a) is a sectional view of the dielectric coaxial resonator according to the second embodiment of the present invention taken along a plane including a central conductor. (B) An open end of the dielectric coaxial resonator according to the second embodiment of the present invention. Side view seen from

FIG. 3A is a cross-sectional view of the dielectric coaxial resonator according to the third embodiment of the present invention taken along a plane including a central conductor. FIG. 3B is an open end of the dielectric coaxial resonator according to the third embodiment of the present invention. Side view seen from

FIG. 4 (a) is a cross-sectional view of the dielectric coaxial resonator according to the fourth embodiment of the present invention taken along a plane including a center conductor. (B) An open end of the dielectric coaxial resonator according to the fourth embodiment of the present invention Side view seen from

5A is a cross-sectional view of the dielectric coaxial resonator according to the fifth embodiment of the present invention taken along a plane including a central conductor. FIG. 5B is an open end of the dielectric coaxial resonator according to the fifth embodiment of the present invention. Side view seen from

6A is a cross-sectional view of the dielectric coaxial resonator according to the sixth embodiment of the present invention taken along a plane including a center conductor, and FIG. 6B is an open end of the dielectric coaxial resonator according to the sixth embodiment of the present invention. Side view seen from

FIG. 7A is a cross-sectional view of a conventional dielectric coaxial resonator taken along a plane including a center conductor, and FIG. 7B is a side view of the conventional dielectric coaxial resonator seen from an open end.

[Explanation of symbols]

11, 21, 31, 41, 51, 61 Dielectric 12, 22, 32, 42, 52, 62 Through hole 13, 14, 23, 24, 33, 34, 43, 44, 5
3, 54, 63, 64 groove 15, 25, 35, 45, 55, 65 center conductor 16, 26, 36, 47, 57, 67 outer conductor

Claims (12)

[Claims] 1. A hollow dielectric body, a plurality of grooves in which conductors are formed in an opening portion of the dielectric body, and a through hole shorter than the entire length of the outer peripheral portion of the dielectric body is formed in the hollow portion of the dielectric body. A dielectric coaxial resonator comprising a central conductor and an outer conductor provided on an outer peripheral portion of the dielectric. 2. A hollow dielectric, a plurality of grooves having conductors formed in the openings of the dielectric, and a through hole shorter than the entire length of the outer circumference of the dielectric in the hollow of the dielectric. Dielectric coaxial resonance including a center conductor, an outer conductor provided on the outer peripheral portion of the dielectric, a short-circuited end provided on one end surface, and an open end provided on the other end surface of the short-circuited end. vessel. 3. A hollow dielectric material, a plurality of grooves in which conductors are formed in an opening portion of the dielectric material, and a through hole shorter than the entire length of the outer peripheral portion of the dielectric material in the hollow portion of the dielectric material. A dielectric coaxial resonator comprising a center conductor, an outer conductor provided on an outer peripheral portion of the dielectric body, and open end portions provided on both end surfaces. 4. The dielectric coaxial resonator according to claim 1, wherein the groove has an opening area that decreases as the depth increases from the opening. 5. The dielectric coaxial resonator according to claim 1, wherein the groove is formed parallel to the outer peripheral portion of the dielectric. 6. The dielectric coaxial resonator according to claim 1, wherein the groove is formed concentrically with the outer peripheral portion of the dielectric. 7. The dielectric coaxial resonator according to claim 1, wherein the dielectric is a rectangular parallelepiped, the through hole is a cylinder, and the connecting portion between the groove and the through hole is a quadrangular pyramid. 8. The dielectric coaxial resonator according to claim 1, wherein the dielectric is a rectangular parallelepiped, the through hole is a cylinder, and the connecting portion between the groove and the through hole is conical. 9. The dielectric coaxial resonator according to claim 1, wherein the dielectric is a cylinder, the through hole is a cylinder, and the connecting portion between the groove and the through hole is conical. 10. The dielectric coaxial according to claim 1, 2 or 3, wherein a portion having a uniform characteristic impedance is provided at a connecting portion of a conductor between the groove formed in the dielectric and the through hole. Resonator. 11. The opening of the dielectric body is characterized in that a plurality of grooves formed in the dielectric body, a central conductor formed by connecting the plurality of grooves to a through hole, and a corner portion of an outer conductor are rounded. The dielectric coaxial resonator according to claim 1, 2 or 3. 12. The dielectric coaxial resonator according to claim 1, wherein the outer peripheral portion of the dielectric body and the outer conductor provided on the outer peripheral portion are shaved.