JPH07131202A - Dielectric resonator - Google Patents

Abstract

PURPOSE:To provide the dielectric resonator which can easily be mounted on a stepless holding jig without requiring a stepped holding jig and can stably be held when an input and an output electrode, etc., are formed on the external surface of a dielectric block having a step part. CONSTITUTION:At least one resonator hole 2 is formed penetrating a couple of opposite end surfaces of the dielectric block 1 provided with the step part 1c, an internal conductor 3 is formed on the inner peripheral surface of the resonator hole 2, and an external conductor 5 is formed covering the nearly entire outer peripheral surface of the dielectric block 1 to constitute the dielectric resonator; and a projection part 1d which is formed integrally with the dielectric block 1 is provided to part or the whole of the upper part of the end surface side of the step part 1c as one end surface side of the dielectric block 1 and the thickness of the part where the projection part 1d is formed is made as large as the thick part of the dielectric block 1.

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 at least one resonator hole formed in a dielectric block having a step portion.

[0002]

2. Description of the Related Art For example, conventionally, there is a dielectric resonator using a dielectric block provided with a step portion as shown in FIG. FIG. 5A is an external perspective view showing the upper surface of a conventional dielectric resonator provided with a step portion, and FIG. 5B is an external perspective view showing the lower surface.

In FIG. 5, a dielectric block 1 is provided with a step portion 1c which is a thin portion, and the upper surface which is one main surface thereof is constituted by a surface having a step-like step and the other main surface. One lower surface is composed of one plane.

In the dielectric block 1, for example, two resonator holes 2 are formed so as to penetrate between a pair of opposing surfaces. An inner conductor 3 is formed on the inner peripheral surface of each resonator hole 2, and a pair of input / output electrodes 4 are formed at predetermined locations on the outer surface of the dielectric block 1 across the lower surface and the side surface. The outer conductor 5 is provided on the entire outer surface except the area where the output electrode 4 is formed.
Are formed.

The inner conductor 3 is one opening surface 1 of the resonator hole 2.
A portion where the inner conductor 3 is not formed is provided in the vicinity of a (hereinafter, referred to as an open end surface), is opened (separated) from the outer conductor 5, and is the other opening surface 1b of the resonator hole 2 (hereinafter, a short-circuited end surface). In the above), it is short-circuited with the outer conductor 5.

The input / output electrode 4 has an outer conductor 5 around it.
Or remove it with a router or ultrasonic processing,
Alternatively, it is formed by printing a conductor.

Usually, when mounting such a dielectric resonator on a substrate, the lower surface on which the input / output electrodes 4 are formed (see FIG. 5).
It is mounted with the upper surface in (b) facing the substrate.

The step portion 1c is provided to improve the characteristics of the dielectric resonator by changing the impedance in the cavity direction.

[0009]

By the way, on the lower surface which becomes the mounting surface of the above-mentioned conventional dielectric block having the step portion,
For example, when the input / output electrodes are formed by printing or ultrasonic processing, in order to prevent the dielectric block 1 from tilting and to stably hold the dielectric block 1 so as not to rattle, as shown in FIG. In addition, the dielectric block 1 was mounted and held in a jig 6 (hereinafter referred to as a stepped holding jig) having a stepped surface that fits the upper surface of the dielectric block 1 therein.

However, the dimension of the stepped portion of the dielectric block varies depending on the desired characteristics of the resonator and the like. In the above-mentioned conventional dielectric resonator, a large number of stepped holding jigs corresponding to the dimension of the stepped portion are used. Was needed. Therefore, the cost of the holding jig and the management cost of the holding jig increase, and the equipment that uses the holding jig cannot be shared. Therefore, the number of setup steps such as replacement of the holding jig is large, and the manufacturing cost is high. There was a problem that would be high.

Further, it is difficult to process the stepped holding jig with high precision, and there are dimensional variations in the stepped portion, etc., and it is difficult to easily mount the dielectric block and hold it stably. There is also a problem that the processing accuracy of the electrodes and the like is poor.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional dielectric resonator, and to form an input / output electrode or the like on the outer surface of the dielectric block having a step portion. An object of the present invention is to provide a dielectric resonator that does not require an attached holding jig, can be easily attached to the holding jig, and can be held stably.

[0013]

To achieve the above object, at least one resonator hole is provided through a pair of opposing end faces of a dielectric block provided with a step portion, and the resonator hole is provided. In a dielectric resonator having an inner conductor formed on the inner peripheral surface of the dielectric block and an outer conductor formed so as to cover substantially the entire outer peripheral surface of the dielectric block, the step formed on one end surface side of the dielectric block A convex portion integrally formed with the dielectric block is provided on a part or the whole of the upper end face side of the portion, and the thickness of the portion where the convex portion is formed is the same as the thick portion of the dielectric block. It is characterized by having done.

[0014]

According to the above construction, the thickness of some or all of the dielectric blocks at both ends of the dielectric block, which are the opening surfaces of the resonator holes, is the same, and the upper surface having the step-like step is lowered. Then, the dielectric block does not tilt even when mounted on the holding jig, and is stably held.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. In the figure, the same parts as those of the conventional example are designated by the same reference numerals, and in the external perspective view, the parts (conductor non-formation parts) where the base material of the dielectric block is exposed are shown by dot-painting.

FIG. 1 shows the structure of a dielectric resonator which is an embodiment of the present invention. FIG. 1A is an external perspective view showing the upper surface,
FIG. 3B is an external perspective view showing the lower surface.

As shown in FIG. 1, the dielectric resonator has two resonator holes 2 penetrating between a pair of opposing surfaces of a dielectric block 1 provided with a step portion 1c. There is.
A convex portion 1d integrally formed with the dielectric block 1 is provided on the stepped portion 1c on the open side end surface 1a side which is one opening surface of the resonator hole 2, and the convex portion 1d is formed. The thickness on the open side end face 1a side is the same as the thickness on the short side end face 1b side which is the other opening face of the resonator hole 2.

An inner conductor 3 is formed on the inner peripheral surface of each resonator hole 2, and a pair of input / output electrodes 4 are formed on a part of the outer surface of the dielectric block 1. An outer conductor 5 is formed on the entire outer surface except for.

The inner conductor 3 is provided with a non-formed portion of the inner conductor 3 in the vicinity of the open end face 1a, which is one opening face of the resonator hole 2, and is opened (separated) from the outer conductor 5 to open the other end. The end surface 1b on the short-circuit side, which is a surface, is short-circuited with the outer conductor 5. In addition, the pair of input / output electrodes 4 is formed so as to be separated from the outer conductor 5 by providing a portion where the outer conductor 5 is not formed around the input / output electrodes 4 and to extend from the lower surface to the side surface of the dielectric block 1.

Usually, when this dielectric resonator is mounted on a substrate, the lower surface on which the input / output electrodes 4 are formed (FIG. 1B).
The upper surface) is mounted on the substrate side.

In the dielectric resonator configured as described above, when the input / output electrodes and the like are formed on the lower surface of the dielectric block 1 by printing or ultrasonic processing, as shown in FIG. Is mounted and held on the holding jig 7 with the stepped surface (upper surface) of the dielectric block 1 facing downward. The bottom surface of the holding jig 7 is formed by one flat surface without steps.

As described above, in the dielectric resonator of the present embodiment, even in the dielectric block having the step portion, the thickness of both end surface portions of the dielectric block is the same, so that the conventional example shown in FIG. It is possible to stably hold the dielectric block with a normal holding jig having no step, without using a holding jig having a stepped surface therein as shown in FIG.

Therefore, in the dielectric resonator of this embodiment,
Unlike the conventional dielectric resonator having a stepped portion, a stepped holding jig that does not require a stepped holding jig according to the size of the stepped portion is used. Can be used. Therefore, it is possible to standardize the holding jig, share the equipment, and reduce the type and number of holding jigs.
The jig cost can be reduced, the number of setup steps such as jig replacement can be reduced, and the manufacturing cost can be reduced.

Further, since the holding jig has no step, it is easy to form the inner surface of the holding jig, and it is possible to accurately process the inner dimensions of the holding jig, thereby reducing the jig manufacturing cost.
The dielectric block can be easily mounted and stably held, and the processing of the input / output electrodes and the like can be performed accurately.

In the above embodiment, the convex portion 1d provided on the upper portion of the step portion 1c is formed over the entire open side end face 1a side, but the present invention is not limited to this, and is shown in FIGS. As described above, it may be provided in a part of the upper portion of the step portion 1c on the open side end face 1a side or in a plurality of places.

Further, the shape of the convex portion does not have to be a substantially rectangular cross section, and may have a side having an arcuate cross section as shown in FIGS. 3 and 4, and the shape thereof is not particularly limited. . Further, the formation position thereof is not particularly limited, and it may be formed at a portion which is apart from the open end surface of the upper portion of the step portion to some extent.

Further, in the above-mentioned embodiments, the dielectric resonator composed of two-stage resonators has been described, but the number of resonators is not limited to this, and one-stage resonator or a plurality of resonators may be used. It may be a resonator.

Further, the inner conductor and the outer conductor are separated from each other on the open end face side in this embodiment, the non-forming portion of the inner conductor is provided from the open end face, but the invention is not limited to this. It may be formed in a portion separated by a certain distance, or a non-formed portion of the outer conductor may be provided on one surface of the open end surface or around the resonator hole on the open end surface.

That is, the present invention can stably hold a dielectric block without using a stepped holding jig even if there is a step portion, and is generally applied to a dielectric resonator having a step portion. You can

[0030]

As described above, according to the present invention, even in a dielectric resonator having a step portion, a part or all of the dielectric block of both end portions which are opening surfaces of the resonator holes of the dielectric block are formed. The thickness is formed with the same size. Therefore, even if the upper surface of the dielectric block with the step is faced down and the bottom surface of the inside is attached to an ordinary holding jig composed of one flat surface without step, the dielectric block does not tilt and is stable. Held in.

That is, when performing an operation such as forming an input / output electrode on the lower surface of the dielectric block, a dedicated holding jig can be used without the need for a dedicated stepped holding jig.

Therefore, the holding jigs can be standardized and standardized, and the equipment can be shared, so that the jig cost and the manufacturing cost can be reduced, and the working accuracy is good and the cost is low. A resonator can be obtained.

[Brief description of drawings]

1A is an external perspective view showing an upper surface of a dielectric resonator according to an embodiment of the present invention, and FIG. 1B is an external perspective view showing a lower surface of FIG. 1A.

FIG. 2 is a view showing how to mount the dielectric resonator according to the present invention on a holding jig,
It is sectional drawing which shows the state hold | maintained.

FIG. 3 is an external perspective view of a dielectric resonator according to another embodiment of the present invention.

FIG. 4 is an external perspective view of another dielectric resonator according to another embodiment of the present invention.

5A is an external perspective view showing an upper surface of a conventional dielectric resonator, and FIG. 5B is an external perspective view showing a lower surface of FIG. 5A.

[FIG. 6] Mounting a conventional dielectric resonator on a stepped holding jig,
It is sectional drawing which shows the state hold | maintained.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dielectric block 1c Step part 1d Convex part 2 Resonator hole 3 Inner conductor 4 Input / output electrode 5 Outer conductor 7 Holding jig

Claims (1)

[Claims] 1. A dielectric block having a stepped portion is provided with at least one resonator hole penetrating through a pair of opposing end surfaces, and an inner conductor is formed on an inner peripheral surface of the resonator hole. In a dielectric resonator having an outer conductor formed so as to cover substantially the entire outer peripheral surface of a body block, a part or all of an upper part of an end surface side of the step portion that is one end surface side of the dielectric block A dielectric resonator, wherein a convex portion integrally formed with the body block is provided, and the thickness of the portion where the convex portion is formed is set to be the same as the thick portion of the dielectric block.