JP3191402B2 - Dielectric resonator and method of manufacturing the same - 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 of manufacturing the same.

[0002]

2. Description of the Related Art A dielectric resonator in which an inner conductor is formed inside a dielectric block and an outer conductor is formed on the outer surface of the dielectric block, and a stripline resonance electrode is formed on one main surface and the other A so-called triplate-type dielectric resonator in which stripline resonance electrodes are opposed to each other using two dielectric substrates having ground electrodes formed on the surface is used as, for example, a filter in a microwave band. .

FIGS. 6 and 7 show the structure of a conventional general dielectric resonator using a dielectric block. FIG. 7 is an external perspective view of the dielectric resonator. In this example, two inner conductor forming holes indicated by 5 and 6 are provided inside the dielectric block,
In addition to providing signal input and output electrodes 9 and 10 on the outer surface,
The outer conductor 4 is formed on almost the entire surface except for the portions where the signal input / output electrodes 9 and 10 are formed. 6A and 6B are cross-sectional views of the dielectric resonator passing through one inner conductor forming hole. FIG. 6A shows a state before the partial deletion of the inner conductor, and FIG. 6B shows a state after the deletion. Thus, the inner conductor 3 is formed in advance on the inner peripheral surface of the inner conductor forming hole 6. From this state, by removing a part of the inner conductor from one opening of the inner conductor forming hole 6, an opening is formed as shown by A and B in FIG. 6B. Thereby, a tip capacitance is generated between the tip (open portion) of the inner conductor 3 and the outer conductor 4.

On the side of the inner conductor forming hole 5 shown in FIG. 4, similarly, an open portion is provided in a part of the inner conductor to provide an external coupling capacitance. In this way, a plurality of resonators are formed in the dielectric block, and the tip capacitance is adjusted by the size S of the open portion shown in FIG. 6B, whereby the resonance frequency of the resonator and the distance between the resonators are adjusted. The degree of coupling is adjusted.

[0005]

However, in the dielectric resonator having the structure shown in FIG. 7, since the open portion of the inner conductor is provided around the opening of the inner conductor forming hole, an electromagnetic field is generated near the opening. Leaks occur. Therefore, when the dielectric resonator is mounted on a circuit board or the like together with other components,
When the metal body approaches the opening surface, there is a possibility that desired resonator characteristics may not be obtained due to the influence of the metal body.

An 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 of the inner conductor forming hole, and solves the above-mentioned problem caused by the electromagnetic field leakage.

Another object of the present invention is to provide a method of manufacturing a dielectric resonator that can easily and accurately adjust a predetermined resonator characteristic.

[0008]

According to a first aspect of the present invention, there is provided a dielectric resonator, wherein 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. In the dielectric resonator, the inner conductor forming hole is formed in a tapered shape such that the inner diameter decreases as it goes from at least one of the openings toward the inside, and the inner conductor is formed in a narrow portion in the inner conductor forming hole. to form an open portion made of deletion, the Uchishirube
Do not expose the open part of the body to the opening of the inner conductor forming hole.
Characterized that you provided to the inner conductor formed holes.

According to a second aspect of the present invention, there is provided a method of manufacturing a dielectric resonator, comprising: forming an inner conductor forming hole having an inner conductor formed on an inner surface of a dielectric; and forming an outer conductor on an outer surface of the dielectric. A method of manufacturing a container, wherein a tapered inner conductor forming hole having a smaller inner diameter is formed from at least one of the openings toward the inside, and the inside of the inner conductor forming hole is formed from the opening of the inner conductor forming hole. An opening of the inner conductor is formed by partially removing the narrowest part, and the opening of the inner conductor is formed in the inner conductor forming hole.
Rutotomoni provided the inside inner-conductor-formed holes without revealed in the opening, and adjusting the properties by the deletion amount.

[0010]

In the dielectric resonator according to the first aspect of the present invention,
The inner conductor forming hole of the dielectric resonator is formed in a tapered shape in which the inner diameter becomes smaller as it goes from at least one opening to the inside, and the inner conductor in the narrow portion is partially deleted, so that the inner conductor is removed. An opening is formed. As described above, the open portion of the inner conductor does not appear in the opening of the inner conductor forming hole, and is provided inside the inner conductor forming hole. Even if another metal body approaches the opening of the formation hole, there is no change in the resonator characteristics due to coupling with the metal body, and stable resonator characteristics can be obtained.

In the method for manufacturing a dielectric resonator according to a second aspect, the inner conductor forming hole of the dielectric resonator is formed in a tapered shape such that the inner diameter thereof decreases as it goes from at least one opening to the inside. The opening of the inner conductor is formed by partially removing the narrowest portion inside the inner conductor forming hole from the opening of the inner conductor forming hole. Since the inner conductor forming hole has a tapered shape whose inner diameter becomes smaller as going toward the inside from the opening in this manner, the inner conductor forming is performed only by inserting a rotary grindstone having a predetermined outer diameter from the opening of the inner conductor forming hole. A predetermined amount of the narrow portion in the hole is deleted, so that the formation of the open portion and the adjustment of the tip capacity can be performed with high efficiency and high accuracy.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dielectric resonator according to a first embodiment of the present invention and a method for manufacturing the same will be described with reference to FIGS.

FIG. 2 is an external perspective view of the dielectric resonator.
As shown in FIG. 2, two inner conductor forming holes indicated by 5 and 6 are provided inside the dielectric block, and the inner conductor is formed in advance on the inner peripheral surface thereof. Signal input / output electrodes 9 and 10 are provided on a part of the outer surface of the dielectric block, and the outer conductor 4 is formed in a region excluding a portion where the signal input / output electrodes 9 and 10 are formed.

FIG. 1 is a sectional view passing through the center axis of the inner conductor forming hole 6 shown in FIG. 2, wherein FIG. 1A shows a state before the inner conductor portion is deleted, and FIG. Show the later state.
As shown in FIG. 1A, the inner conductor forming hole 6 is a through hole that penetrates the dielectric block 1, and is formed as a tapered through hole whose inner diameter becomes smaller from the opening at both ends to the inside. The inner conductor 3 is previously formed on the inner main surface. In FIG. 1A, reference numeral 11 denotes a rotary grindstone for partially removing the inside of the inner conductor forming hole. Here, the diameters a and c of the two opening surfaces of the inner conductor forming hole are 1600 μm, the inner diameter b of the narrowest portion of the inner conductor forming hole is 1400 μm, and the depth d from one opening surface to the narrowest portion is 500 μm. The outer diameter e of the rotating grindstone 11 is 1500 μm. Therefore, while the rotating grindstone 11 is kept rotating, it is relatively inserted into the inner conductor forming hole 6 from one opening thereof along the central axis of the inner conductor forming hole 6, thereby narrowing the inner conductor forming hole. The dielectric and the inner conductor in the part are partially deleted. FIG. 1 (B)
The formation position and size of the open portion S shown in (1) are determined by the shape of the inner conductor forming hole, the outer diameter of the rotating grindstone to be used, and the insertion amount thereof. Therefore, the shape and dimensions of the inner conductor forming hole of the dielectric resonator are designed in advance, the rotating grindstone to be used is selected, and the tip capacitance is adjusted by the insertion depth, thereby making it possible to adjust the resonance frequency and the resonance frequency. The degree of coupling can be adjusted.

FIG. 3 is an equivalent circuit diagram of the dielectric resonator shown in FIGS. In FIG. 3, R1 is an inner conductor forming hole 5.
And R2 is a resonator formed by the inner conductor forming hole 6.

Cs is a tip capacitance formed at the open portion of each inner conductor. Ce is the signal input / output electrode 9,
It is an external coupling capacitance formed between 10 and the open portion of the inner conductor. Thus, the dielectric resonator shown in FIGS. 1 and 2 can be used as a two-stage bandpass filter.

Next, as a second embodiment, a structure of a so-called triplate type dielectric resonator is shown in FIG.

FIG. 4 is an exploded perspective view showing a state before joining two dielectric substrates. In FIG. 4, reference numerals 16 and 17 denote dielectric substrates, respectively. On the first main surface (the upper surface in the figure) of the dielectric substrate 17, three grooves having a semicircular cross section are formed, and the inner conductors 12, 13, 14 are formed on the inner surface thereof. In addition, the dielectric substrate 17 facing the
From one end face to the second main face (the bottom face in the figure)
One signal input / output electrode is formed. Reference numeral 10 in FIG. 4 denotes one of the signal input / output electrodes. Further, on the other surface (five surfaces) of the dielectric substrate 17 except for the first main surface, the outer conductor 4 is formed on almost the entire surface except for the signal input / output electrode forming portion. One dielectric substrate 16 also has a groove having a semicircular cross section in substantially the same manner as the dielectric substrate 17, and has an inner conductor formed on its inner surface, and the other surface except the surface facing the dielectric substrate 17 is formed. The outer conductor 4 is formed on almost the entire surface of the (fifth surface). The two dielectric substrates 1 thus formed
6 and 17 are joined with the inner conductor forming surfaces facing each other. Thus, similarly to the dielectric resonator shown in the first embodiment, a tapered inner conductor forming hole whose inner diameter becomes smaller from one opening toward the inside is provided. Thereafter, by inserting a rotary grindstone from one opening of the inner conductor forming hole by the same method as described in the first embodiment, the dielectric and the inner conductor in the narrow portion of the inner conductor forming hole are partially deleted. .

Next, as a third embodiment, FIG. 5 shows the structure of a dielectric resonator formed by combining a dielectric block and a dielectric substrate. FIG. 5 is an exploded perspective view, wherein 1 is a dielectric block, and 15 is a dielectric substrate. The dielectric block 1 has a tapered inner conductor forming hole 5 whose inner diameter becomes smaller from at least one opening toward the inside.
6, 7, 8 are provided, and an inner conductor is formed on the inner peripheral surface. On the other five surfaces of the dielectric block 1 except for the surface facing the dielectric substrate 15, the outer conductor 4 is formed on almost the entire surface except for a portion in contact with a signal input / output electrode described later. In addition,
It is not necessary to form a conductor pattern on the surface of the dielectric block 1 facing the dielectric substrate 15, but a conductor pattern similar to the first main surface of the dielectric substrate 15 may be formed. The signal input / output electrodes 9 and 10 are formed from the surface (upper surface in the figure) of the one dielectric substrate 15 facing the dielectric block 1 to the back surface via the end surface. This dielectric substrate 15
The outer conductor 4 is formed from the second main surface (the bottom surface in the drawing) to the peripheral portion of the first main surface via the end surface except for the portions where the signal input / output electrodes 9 and 10 are formed. The dielectric substrate 15 is bonded to the bottom surface of the thus formed dielectric block 1 in the drawing. Thereafter, a rotating grindstone is inserted into one of the openings of the inner conductor forming holes 5, 6, 7, and 8 to partially remove the dielectric and the inner conductor in the narrow portion of the inner conductor forming hole. As a result, the signal input / output electrodes 9, 10
Couples the capacitance with the vicinity of the open end of the inner conductor in the inner conductor forming holes 5 and 8.

[0020]

According to the dielectric resonator according to the first aspect of the present invention, the opening of the inner conductor is formed at a position deeper than the opening of the inner conductor forming hole, so that the influence of the electromagnetic field leakage is reduced. Few. Therefore, stable resonator characteristics can be obtained without being affected by the external environment.

According to the method of manufacturing a dielectric resonator according to the second aspect, the opening can be formed simply by inserting the rotary grindstone from the opening of the inner conductor forming hole into the inside, and the adjusting method thereof is also simple. Therefore, desired resonator characteristics can be easily obtained.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a method for adjusting the characteristics of a dielectric resonator according to a first embodiment of the present invention, wherein FIG. 1A shows a state before an inner conductor portion is deleted, and FIG. Indicates the status.

FIG. 2 is an external perspective view of the dielectric resonator according to the first embodiment.

FIG. 3 is an equivalent circuit diagram of a dielectric resonator according to a conventional example and an embodiment of the present invention.

FIG. 4 is an exploded perspective view of a dielectric resonator according to a second embodiment.

FIG. 5 is an exploded perspective view of a dielectric resonator according to a third embodiment.

6A and 6B are cross-sectional views illustrating a conventional method of manufacturing a dielectric resonator, wherein FIG. 6A shows a state before the inner conductor portion is deleted, and FIG. 6B shows a state after the inner conductor portion is deleted.

FIG. 7 is an external perspective view of a conventional dielectric resonator.

[Description of Signs] 1-dielectric block 3-inner conductor 4-outer conductor 5,6,7,8-inner conductor forming hole 9,10-signal input / output electrode 11-rotary grindstone 12,13,14-inner conductor 15, 16, 17-dielectric substrate

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-269803 (JP, A) JP-A-3-38101 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01P 1/205 H01P 1/203 H01P 5/08

Claims (2)

(57) [Claims] In a dielectric resonator, 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. As it goes from the opening to the inside, it is formed in a tapered shape whose inner diameter becomes smaller, and an opening made by deleting the inner conductor is formed in a narrow place in the inner conductor forming hole, and the opening of the inner conductor is made Inner conductor formation hole
Characterized in that the dielectric resonator is provided inside the inner conductor forming hole without being exposed in the opening . 2. A method for manufacturing a dielectric resonator, comprising: forming an inner conductor forming hole having an inner conductor on an inner surface thereof in a dielectric; and forming an outer conductor on an outer surface of the dielectric, wherein at least one opening is provided. Forming a tapered inner conductor forming hole having a smaller inner diameter toward the inside from the portion, and opening the inner conductor by partially removing the narrowest portion in the inner conductor forming hole from the opening of the inner conductor forming hole. The inner conductor
Of the inner conductor is not exposed in the opening of the inner conductor forming hole.
Body formed holes therein arranged Rutotomoni, manufacturing method of a dielectric resonator and adjusts the characteristics by the deletion amount.