JP2000323909A - Manufacture of dielectric resonator, manufacture of dielectric filter, manufacture of duplexer and manufacture of communication machine equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dielectric resonator manufacture method which is highly efficient and in which no dispersion in characteristics is caused by the aberration of a rotary grindstone. SOLUTION: The manufacture method of a dielectric resonator includes a process for forming at least two holes 21a and 21b arranged in parallel and a process for inserting a rotary grindstone 15 into one hole 21a among the holes 21a and 21b arranged in parallel, moving the rotary grindstone 15 until it reaches the other hole 21b among the holes 21a and 21b arranged in parallel and cutting the dielectric pole 12 of a dielectric resonator at the time of forming the dielectric resonator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a dielectric resonator including a step of adjusting the frequency of the dielectric resonator and adjusting the coupling amount of the multi-mode dielectric resonator by cutting the dielectric resonator. The present invention relates to a method for manufacturing a dielectric filter, a method for manufacturing a duplexer, and a method for manufacturing a communication device.

[0002]

2. Description of the Related Art A conventional method of manufacturing a dielectric resonator is shown in FIG.
This will be described based on. FIG. 10 is a front view of a conventional dielectric resonator, and FIGS. 11 and 12 are views showing a cutting process for adjusting a resonance frequency and the like. As shown in FIG. 10, a dielectric resonator 110 is formed by arranging a cross-shaped dielectric pillar 112 in a rectangular cylindrical cavity 111, and applying a silver paste to the outer surface of the cavity 111 to form a conductor. A layer 113 is formed. With such a configuration, the dielectric resonator 11
0 functions as a dual mode dielectric resonator having two resonance modes. The cavity 111 and the dielectric pillar 112
Is integrally formed by injection molding of a dielectric using a mold.

In such a dielectric resonator 110,
The resonance frequency is previously set to be low, the dielectric resonator is integrally formed, and the dielectric at a predetermined position is cut to increase the resonance frequency to obtain a dielectric resonator having a desired resonance frequency. Alternatively, the coupling amount of the two resonance modes is changed by cutting a dielectric at a predetermined position. Specifically, holes 121 and 122 in FIG. 10 are provided by cutting to adjust the resonance frequency, and holes 131 and 13 at the intersections of dielectric pillars 112 are provided.
2 is provided by cutting to adjust the coupling amount.

[0004] When forming a hole provided for adjusting the resonance frequency and the amount of coupling, a dielectric is cut using a rota- ter (rotary grindstone) 115 as shown in Figs. That is, as shown in the sectional view of FIG.
5 is advanced in the axial direction to cut the dielectric of the dielectric resonator. However, the cutting direction in this case is
Since the axial direction of the luter 115 is a direction perpendicular to the rotation direction of 5, the cutting force is weak. Therefore, as shown in the plan view of FIG. 12, while rotating the axis of the router 115 with a small radius, the router 115 is advanced in the axial direction. Also, after the luta 115 has been advanced to some extent in the axial direction,
The dielectric material is cut by moving the router 115 in a direction perpendicular to the axial direction of the router 115, that is, in a horizontal direction.
Thus, a dielectric resonator having desired characteristics such as a resonance frequency and a coupling amount is manufactured.

[0005]

In the conventional method of manufacturing a dielectric resonator, the luter is advanced in the axial direction while cutting the dielectric. However, in such a method for manufacturing a dielectric resonator, since the cutting direction is the axial direction of the luter, the cutting force of the luter is weak. Therefore, there is a problem that it takes a considerable amount of time to obtain a necessary cutting amount, and the manufacturing efficiency is low.

[0006] Further, when the dielectric is cut by moving the luter in the horizontal direction, there is a problem that the amount of cutting is not constant due to wear of the luter, and desired adjustment cannot be performed. That is, the dielectric of the dielectric resonator has a relatively high hardness, and when the luter is moved in the horizontal direction, the main body of the luter is bent and does not become a straight line. When mass-producing dielectric resonators in such a situation, in the initial stage, for example, set to move in the horizontal direction of 5 mm, perform cutting, and even if 5 mm was actually cut, after the luter was worn, In this case, the moving force of the luter in the horizontal direction is weakened, and the bending of the main body of the luter increases. In other words, even if a setting of 5 mm cutting is made, the actual cut will be 4.5 mm.

The method of manufacturing a dielectric resonator, the method of manufacturing a dielectric filter, the method of manufacturing a duplexer, and the method of manufacturing a communication device according to the present invention have been made in view of the above-mentioned problems. A method of manufacturing a dielectric resonator that has good manufacturing efficiency and does not cause variations in the characteristics of the dielectric resonator, a method of manufacturing a dielectric filter using the dielectric resonator manufactured by the method, and a method of manufacturing a duplexer. It is an object to provide a manufacturing method and a method for manufacturing a communication device.

[0008]

In order to achieve the above object, a method of manufacturing a dielectric resonator according to the present invention comprises a step of forming at least one hole during molding of the dielectric resonator, and a cutting jig in the hole. And cutting the dielectric resonator by moving the cutting jig in a direction different from the axial direction of the hole.

In the method of manufacturing a dielectric resonator according to the present invention, a cutting jig is inserted into a hole provided in advance, and the cutting jig is moved in a direction different from the axial direction of the cutting jig. The dielectric resonator was cut to adjust the resonance frequency and the amount of coupling. That is, since the holes are provided in advance in the axial direction of the cutting jig, there is no need to perform cutting in the axial direction of the cutting jig. Therefore, the time required for cutting for adjusting the resonance frequency and the coupling amount is reduced, and the manufacturing efficiency of the dielectric resonator is increased.

According to a second aspect of the present invention, there is provided a method of manufacturing a dielectric resonator, comprising: forming at least two juxtaposed holes at the time of forming the dielectric resonator; Inserting the jig and moving the cutting jig to the other of the juxtaposed holes to cut the dielectric resonator.

The two holes formed in the dielectric resonator are arranged in advance at a predetermined interval by designing a mold. In other words, for example, if the interval between the two holes is set to 5 mm, when the dielectric jig is cut by moving the cutting jig from one hole to the other hole, regardless of the wear of the cutting jig, etc. You can always cut 5mm. The adjustment of the cutting amount can be performed by changing the depth, that is, the insertion amount of the cutting jig into the hole.

Further, according to a third aspect of the present invention, there is provided a method of manufacturing a dielectric resonator, wherein at least one hole is formed at the time of forming the dielectric resonator, and the outside of the dielectric resonator is cut off on the axis of the hole. A step of disposing the jig, and a step of moving the cutting jig to reach the hole to cut the dielectric resonator.

[0013] Even when cutting is performed by such a method, the distance from the end of the dielectric resonator to the hole formed in the dielectric resonator is set to a predetermined distance in advance by designing a mold, so that the cutting is performed. Irrespective of the wear of the jig, constant cutting can always be performed.

Furthermore, a method of manufacturing a dielectric filter according to the present invention is a method of manufacturing a dielectric filter including a dielectric resonator and input / output connection means connected to the dielectric resonator. The dielectric resonator is formed by using the method for manufacturing a dielectric resonator according to claims 1 to 3.

Still further, the method of manufacturing a duplexer according to the present invention is characterized in that at least two dielectric filters, input / output connection means connected to each of the dielectric filters,
A method for manufacturing a duplexer, comprising: an antenna connection means commonly connected to the dielectric filter, wherein the dielectric filter is formed using the method for manufacturing a dielectric filter according to claim 4. I have.

Still further, the method of manufacturing a communication device according to the present invention is characterized in that the duplexer, a transmission circuit connected to at least one input / output connection means of the duplexer, and the input circuit connected to the transmission circuit. A method for manufacturing a communication device, comprising: a receiving circuit connected to at least one input / output connection unit different from an output connection unit; and an antenna connected to an antenna connection unit of the duplexer. The duplexer is formed using the duplexer manufacturing method according to claim 5. As a result, a dielectric filter, a duplexer, and a communication device having good manufacturing efficiency and no variation in characteristics can be obtained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a dielectric resonator according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of the dielectric resonator of the present embodiment, and FIG.
FIG. 4 is a diagram showing a cutting process for adjusting a resonance frequency and the like. As shown in FIG. 1, a dielectric resonator 10 is formed by arranging a cross-shaped dielectric pillar 12 in a rectangular cylindrical cavity 11, and a silver paste is applied to the outer surface of the cavity 11 by applying and firing silver paste. Layer 13 is formed. With such a configuration, the dielectric resonator 10 functions as a dual mode dielectric resonator having two resonance modes. The cavity
The dielectric column 11 and the dielectric column 12 are integrally formed by injection molding of a dielectric using a mold.

In such a dielectric resonator 10, the resonance frequency is set to a low value in advance, the dielectric resonator is integrally formed, and the dielectric at a predetermined position is cut to increase the resonance frequency, thereby increasing the desired frequency. A dielectric resonator having a resonance frequency is obtained. Alternatively, the coupling amount of the two resonance modes is changed by cutting a dielectric at a predetermined position. Specifically, holes 21 and 22 in FIG. 1 are provided by cutting to adjust the resonance frequency, and holes 31 and 32 at the intersections of the dielectric columns 12 are provided by cutting to adjust the coupling amount.

In the method of manufacturing a dielectric resonator according to the present embodiment, when a dielectric resonator including a cavity 11 and a dielectric column 12 is formed by injection molding, a resonance frequency and a coupling amount are adjusted. The mold is designed so that two juxtaposed holes are formed at a predetermined size and at an interval where the cutting is to be performed. When cutting for adjusting the resonance frequency and the coupling amount, as shown in the cross-sectional view of FIG. 2, the router 1 is inserted into one of the two holes 21a and 21b formed in advance.
5 is inserted, and the router 15 is horizontally moved toward the other hole 21b. At this time, the router 15 is moved until it reaches the other hole 21b.

By using such a method of manufacturing a dielectric resonator, the axial movement of the router 15 can be achieved only by inserting it into the hole 21a of the dielectric resonator provided in advance. There is no need to advance the luter 15 in the axial direction while cutting the resonator. Therefore, the time required for cutting is reduced, and the efficiency of manufacturing the dielectric resonator is improved.
In addition, since the luter 15 can be moved from the two juxtaposed one holes 21a to the other hole 21b, the amount of cutting does not vary due to wear of the luter 15, and a dielectric resonator having desired characteristics is always provided. Obtainable. Since the resonance frequency and the amount of coupling are adjusted by the cutting depth, the insertion depth is adjusted when the router 15 is inserted into the hole 21a of the dielectric resonator, and the router is adjusted at a predetermined insertion depth. Move 15 horizontally.

Also, as in this embodiment, two juxtaposed holes are provided.
In order to provide the dielectric resonator 10 with 21a and 21b in advance,
The following effects also exist. That is, if two juxtaposed holes 21a and 21b are provided in advance in the dielectric resonator 10,
Since the portions a and 21b form an air layer, the electric field in the resonance mode or the coupling mode is concentrated on the dielectric portion sandwiched between the two holes 21a and 21b. Cutting the dielectric in the area where the electric field is concentrated, compared to cutting the dielectric in the area where there is no hole and the electric field is not concentrated, the change in the resonance frequency and the amount of coupling per amount of cutting increases. . That is, two juxtaposed holes
By providing the dielectric resonator 10 in advance with 21a and 21b and cutting the dielectric in the portion sandwiched between the holes 21a and 21b in the horizontal direction, a more efficient method of manufacturing the dielectric resonator is provided. can do.

Next, a method of manufacturing a dielectric resonator according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a plan view of the dielectric resonator of the present embodiment, and FIG.
Is a side view thereof. Further, the cutting method of the dielectric resonator and its effects are the same as those in the previous embodiment, and the description thereof will be omitted. As shown in FIGS. 3 and 4, the dielectric resonator 40 includes:
It is supported by a support table 41 and is disposed in a shield case (not shown). Here, the support base 41 is formed separately from the dielectric resonator 40 and is adhered to the dielectric resonator 40 by glass glaze or the like, but the one formed integrally with the dielectric resonator 40 is used. It does not matter.

The dielectric resonator 40 has a square shape when viewed from above.
It has a shape with corners dropped, so make it like this
Thus, the three resonance modes shown in FIG. 5, that is, TM01δ_{y + x}
Mode, TE01δ_zMode, TM01δ_yxResonating in mode
It can be used as a heavy mode dielectric resonator. Where the subscript
Means that the direction is the axial direction, for example, TM01δ
_{y + x}The mode is the vector of the sum of the y vector and the x vector.
In the TM01δ mode when the
You. Here, the vertical direction is the z-axis, and in FIG.
Indicates an electric field by a solid line and a magnetic field by a broken line. (Note that this
Here, TM01δ_{y + x}The mode is the first resonance mode, TE01δ_z
The mode is the second resonance mode, TM01δ_{y- x}Mode three steps
Let it be the eye resonance mode. The resonance frequency of the dielectric resonator 40 having such a resonance mode
Off when adjusting the coupling between wave numbers and resonance modes
The cutting position has an electric field distribution in its resonance mode
Position, specifically as shown below with reference to FIG.
It is. That is, the adjustment of the resonance frequency of the first stage is mainly
This is performed by cutting two opposing corners 45. Ma
Adjustment of the resonance frequency in the second stage is mainly performed around the dielectric resonator.
This is performed by cutting the edge portion 23. In addition, the third stage
Adjustment of resonance frequency mainly cuts two opposite corners 46
It is done by doing. Furthermore, the first stage and the second stage
The adjustment of the coupling amount depends on the first-stage resonance mode and the second-stage resonance mode.
By cutting the intersections 33 and 34
Direction to increase the coupling amount by cutting part 33
In the direction to reduce the coupling amount by cutting the part 34
Change. Furthermore, the amount of coupling between the second and third stages
In the adjustment, the second resonance mode and the third resonance mode
This is done by cutting the intersecting parts 35, 36,
Part 36 in the direction to increase the amount of bonding by cutting
By cutting, it is changed in a direction to reduce the amount of bonding.
Furthermore, the adjustment of the amount of coupling between the first and third stages depends on the dielectric
By cutting the central part 37, 38 of the body resonator,
In the direction to increase the coupling amount by cutting the part 37,
By cutting the minute 38
Let

Although the resonance frequency and the coupling amount of the dielectric resonator 40 are adjusted by the above-described cutting, the present invention provides a cutting portion 23 for adjusting the resonance frequency of the second stage, the first stage and the second stage. Cutting parts 33, 34 for adjusting the coupling amount of the cutting parts 35, 36 for adjusting the coupling amount of the second and third stages, for adjusting the coupling amount of the first and third stages Can be applied to the cutting parts 37 and 38 of

Further, a method of manufacturing a dielectric resonator according to a modification of the second embodiment will be described with reference to FIG. Since the configuration is almost the same as that of the previous embodiment, the description thereof is omitted. In addition, although a plurality of holes are actually formed in the dielectric resonator, only a point provided in this embodiment will be described with reference to a diagram in which one hole is provided.

As shown in FIG. 6, the dielectric resonator 40a has a hole 24 formed in advance near a corner thereof. Such a hole
If the position of the hole 24 is previously set as a predetermined position by design when forming the hole 24, a constant amount of cutting can be always performed. That is, the luter is arranged on the side of the dielectric resonator, and the luter is moved in the horizontal direction to cut until the hole 24 is reached. Alternatively, if the luter is inserted in the hole 24 and the luter is moved in the horizontal direction so that the dielectric is completely cut to the side of the dielectric resonator, there is no need to cut in the axial direction of the luter. The amount of cutting does not vary due to wear of the steel.

The method for manufacturing a dielectric resonator according to the present invention is not limited to the above embodiment, but can be applied to any resonator using a dielectric. The holes provided in the dielectric resonator in advance may be through holes or bottomed holes.

Hereinafter, a method for manufacturing a dielectric filter, a method for manufacturing a duplexer, and a method for manufacturing a communication device according to the present invention will be described with reference to FIGS. 7 to 9 are schematic diagrams of a dielectric filter, a duplexer, and a communication device obtained by each of the method for manufacturing a dielectric filter, the method for manufacturing a duplexer, and the method for manufacturing a communication device according to the present invention.

As shown in FIG. 7, the dielectric filter 50 comprises a dielectric resonator 40, input connection means 51, and output connection means 52. When manufacturing such a dielectric filter 50, for example, a dielectric resonator as shown in FIGS. 3 and 4 is housed in a shield case, and an input loop and an output loop are provided at predetermined positions. Attach the coaxial connector and the output coaxial connector. Then, the center conductor of the input coaxial connector is connected to the input loop, and the center conductor of the output coaxial connector is connected to the output loop. Note that a plurality of dielectric resonators may be arranged,
In that case, the dielectric resonators are respectively arranged in the shield cases provided with the metal partitions, and a loop for coupling between the resonators is attached between the dielectric resonators.

Thereafter, by using the method for manufacturing a dielectric resonator as shown in the previous embodiment, that is, by cutting the dielectric resonator by the above-described method, the manufacturing efficiency is improved and the characteristics are not varied. A dielectric filter is obtained. In addition,
When cutting a dielectric resonator, even if you take out the dielectric resonator from the shield case and cut the dielectric resonator,
A window for inserting a luter is provided in a part of the shield case,
From there, a dielectric resonator may be cut by inserting a luta. This applies to a duplexer and a communication device described below.

Further, as shown in FIG.
Is composed of a transmission filter 50a and a reception filter 50b, and input / output connection means 61 and 62 are formed on the input side of the transmission filter 50a and the output side of the reception filter 50b. The output side of the transmission filter 50a and the input side of the reception filter 50b are integrated in the antenna connection means 63. The transmitting filter 50 in the duplexer 60
a and the reception filter 50b are dielectric filters as shown in the previous embodiment, and the transmission filter 50a allows only a signal in a predetermined frequency band to pass therethrough, and the reception filter 50b
To pass only signals in a frequency band different from the frequency of the transmission filter 50a.

For the specific configuration of such a duplexer 60, the configuration of the above-described dielectric filter can be used. That is, a dielectric resonator used for a transmission filter and a dielectric resonator used for a reception filter are respectively arranged in a shield case, and a coaxial connector for input, a coaxial connector for output, and a Attach each coaxial connector. Then, the loop connected to the center conductor of each coaxial connector is arranged in the shield case.

Further, as shown in FIG.
Are a duplexer 60, a transmitting circuit 71, and a receiving circuit 72.
And an antenna 73. Here Duplexer 60
The input / output connection means 61 connected to the transmission filter 50a in FIG. 8 is connected to the transmission circuit 71 and connected to the reception filter 50b. The output connection means 62 is connected to the reception circuit 72. The antenna connection means 63 is connected to the antenna 73.

Also in these duplexers and communication devices, the manufacturing efficiency of the dielectric resonator as described in the previous embodiment is used, that is, by cutting the dielectric resonator by the above-described method, the manufacturing efficiency is improved. It is possible to obtain a duplexer and a communication device with good characteristics and without variation.

[0035]

As described above, according to the present invention, in the method of manufacturing a dielectric resonator, a hole is previously provided in the dielectric resonator, and a cutting jig is inserted into the hole to form the hole. The dielectric resonator is cut by moving the cutting jig in a direction different from the axial direction. This eliminates the necessity of moving the cutting jig while cutting the dielectric resonator in the axial direction of the cutting jig, which the cutting jig is not good at, thereby reducing the time required for cutting, The efficiency of manufacturing the dielectric resonator is increased.

In the case where two holes are juxtaposed in advance in the dielectric resonator, in addition to the above-described effects, cutting from one hole to the other hole is sufficient. This eliminates variation in the cutting amount.
As a result, a dielectric resonator that is characteristically stable with respect to the resonance frequency and the coupling amount can be mass-produced.

Further, the above-described effect can be obtained even when the cutting jig is moved from outside the dielectric resonator to a hole provided in the dielectric resonator in advance.

[Brief description of the drawings]

FIG. 1 is a front view of a dielectric resonator according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a cutting step according to the present invention.

FIG. 3 is a plan view of a dielectric resonator according to a second embodiment of the present invention.

FIG. 4 is a side view of a dielectric resonator according to a second embodiment of the present invention.

FIG. 5 is a diagram showing three resonance modes of a dielectric resonator according to a second embodiment of the present invention.

FIG. 6 is a plan view of a dielectric resonator according to a modification of the second embodiment of the present invention.

FIG. 7 is a schematic view of a dielectric filter of the present invention.

FIG. 8 is a schematic diagram of a duplexer of the present invention.

FIG. 9 is a schematic diagram of a communication device of the present invention.

FIG. 10 is a front view of a conventional dielectric resonator.

FIG. 11 is a cross-sectional view showing a conventional cutting step.

FIG. 12 is a plan view showing a conventional cutting process.

[Explanation of symbols]

 10, 40, 40a Dielectric resonator 11 Cavity 12 Dielectric column 13 Conductive layer 15 Luter 21 to 23 Frequency adjustment holes 21a, 21b Pre-formed holes 31 to 38 Coupling amount adjustment holes 50 Dielectric filter 60 Duplexer 70 communication equipment

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Kazuhiko Kubota 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Inside Murata Manufacturing Co., Ltd.

Claims (6)

[Claims] 1. A step of forming at least one hole at the time of forming a dielectric resonator, inserting a cutting jig into the hole, and moving the cutting jig in a direction different from the axial direction of the hole. Cutting the dielectric resonator by using a method for manufacturing the dielectric resonator. 2. A step of forming at least two juxtaposed holes at the time of molding the dielectric resonator, and inserting a cutting jig into one of the juxtaposed holes to form the other of the juxtaposed holes. 2. The method for manufacturing a dielectric resonator according to claim 1, further comprising the step of: moving the cutting jig to a hole to cut the dielectric resonator. 3. A step of forming at least one hole during molding of the dielectric resonator, a step of arranging a cutting jig outside the dielectric resonator not on the axis of the hole, and Moving the cutting jig to cut the dielectric resonator. 4. A method for manufacturing a dielectric filter, comprising: a dielectric resonator; and input / output connection means connected to the dielectric resonator, wherein the dielectric resonator is formed of a dielectric resonator. A method for manufacturing a dielectric filter, which is formed by using the method for manufacturing a dielectric resonator described above. 5. A semiconductor device comprising: at least two dielectric filters; input / output connection means connected to each of said dielectric filters; and antenna connection means commonly connected to said dielectric filters. 5. A method for manufacturing a duplexer, wherein the dielectric filter is formed using the method for manufacturing a dielectric filter according to claim 4. 6. A duplexer, a transmission circuit connected to at least one input / output connection means of the duplexer, and at least one input / output connection different from the input / output connection means connected to the transmission circuit. 6. A method of manufacturing a communication device, comprising: a receiving circuit connected to a communication unit; and an antenna connected to an antenna connection unit of the duplexer, wherein the duplexer is the method of manufacturing a duplexer according to claim 5. A method for producing a duplexer, comprising: