JPH08288712A - Dielectric resonator - Google Patents

Abstract

PURPOSE: To obtain a resonator excellent in electric stability and reliability by providing a resonator fitting to be connected to the resonator with metallic elasticity and inner space and forming two projections opposed to each other in the vertical direction. CONSTITUTION: The resonator fitting 7 is formed by punching a metallic plate having elasticity, an electrode connecting part 13 is formed on one end of the fitting 7 and an inserting part 19 is formed on the other end in the direction rectangular to the connecting part 13. A space 14 like a longitudinal hole is formed on the center part of the inserting part 19 and fitting stops 8 for regulating the inserting length of the inserting part 19 projects to both the outsides on the side of the connecting part 13. The fitting 7 is always held on the center position by adding a pair of projection parts 12 opposed to each other in the vertical direction of the metallic plate. Since press contact parts 9 ad the projections 12 are pressed against an inner conductor 4, and even when either one of the press contact parts 9 is held at a contact state, so that highly reliable connection excellent in electric stability can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator used for a dielectric filter mainly used in mobile phones, car phones, satellite communications and the like.

[0002]

2. Description of the Related Art In recent years, microwave communication devices such as mobile phones have made remarkable progress. There is a strong demand for miniaturization and high stability of the filter used for it, and also for the dielectric resonator which is a component of the filter, as it continues to be miniaturized and high performance.

An example of the above-mentioned conventional dielectric resonator will be described below with reference to the drawings.

FIG. 11 is a sectional view of a conventional dielectric resonator. In FIG. 11, the dielectric resonator is an inner conductor 104 and an outer conductor 105 which are formed by using copper or silver on the inner and outer peripheral surfaces of a cylindrical dielectric 101 as shown in the figure.
Is formed, and the inner conductor 104 and the outer conductor 105 are short-circuited to each other by the short-circuit conductor 102 at the short-circuit end 103 on one end side of the dielectric 101. A conventional dielectric resonator having such a structure has resonator metal fittings 107 on an island-shaped electrode 111 of a terminal substrate 110 as shown in FIG.
Is electrically and mechanically connected by soldering and one end of
It is electrically and mechanically attached to the inner conductor 104.
As shown in FIGS. 11 and 12, this resonator fitting 107 has an electrode connecting portion 113 at one end, and an inserting portion 109 extending in a direction orthogonal to one end of the electrode connecting portion 113 is provided. A fitting stopper 108 for restricting the insertion is provided on the side of the connection portion 113, and the space portion 1 is provided at the center of the insertion portion 109.
14 is provided, and pressure contact portions 112 projecting outward are provided on both sides of the intermediate portion of the insertion portion 109, and the tip portion 1 of the insertion portion 109 is provided.
15 is configured to be a triangle. However, the resonator metal fitting 107 that is in pressure contact with the inner conductor 104 has a pressure contact portion 112 in the horizontal direction of the metal plate, and an opening or space 114 for elastically deforming the elastic insertion portion 109 inside the pressure contact portion 112. Had only one.

[0005]

However, in the above structure, the electrode connecting portion 1 is affected by thermal stress during reflow mounting or mechanical stress due to vibration during manufacturing.
Since 13 is mechanically held by the island-shaped electrode 111 by solder, the space portion 114 is deformed inwardly, and accordingly, the pressure contact portion 112 is also deformed inwardly and is not in contact with the inner conductor 104. The metal fitting 107 has a problem in that the tensile strength of the resonator metal fitting 107 is weakened due to variations in mounting and variations in dimensions during manufacture, and reliability is also very unstable.

In view of the above problems, it is an object of the present invention to provide a dielectric resonator having excellent electrical stability and excellent reliability.

[0007]

In order to solve the above-mentioned problems, the dielectric resonator of the present invention has a through hole from the open surface toward the opposed short-circuit end, and an inner conductor is provided in this through hole. A dielectric resonator having an outer conductor provided on the outer peripheral surface and a short-circuit conductor provided at a short-circuit end, and a resonator fitting made of a metal plate to be inserted into the through hole, wherein the resonator fitting is inside the through hole. In addition to having a pressure contact portion in a direction horizontally and opposite to the metal plate pressure-contacting the inner conductor coated on the peripheral surface, a space portion is provided in the metal plate and inside the pressure-contact portion opposing each other in order to give elasticity to the pressure contact portion. And a structure in which a protrusion is provided in a vertical direction opposite to the pressure contact portion.

[0008]

With the above-described structure, the resonator fitting has the horizontal and vertical pressure contact portions and the protruding portion, respectively, even when subjected to thermal stress and mechanical stress, so that the resonator fitting can be used as a dielectric resonator in the horizontal and vertical directions. Even when the resonator fitting is inserted in a biased manner, the resonator fitting is always held in the center and has a spring property, so that high reliability can be maintained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A dielectric resonator according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a dielectric resonator according to an embodiment of the present invention. A through hole 17 is provided from the open end 6 of the columnar dielectric 1 toward the short-circuit end 3. The inner conductor 4 is provided in the through-hole 17, the outer conductor 5 is provided on the outer peripheral surface of the dielectric 1, and the short-circuit end 3 is formed. 1 is provided with a quarter-wavelength dielectric resonator 16 provided with a short-circuit conductor 2, and a resonator metal fitting 7 made of a metal plate to be inserted into the through hole 17, which is shown in FIG. As shown in FIG. 3, an insertion portion formed by punching out a metal plate having elasticity, having an electrode connecting portion 13 at one end, and projecting in a direction orthogonal to the electrode connecting portion 13 at one end of the electrode connecting portion 13. 19 is provided, a long hole-shaped space portion 14 is provided at the center of the insertion portion 19, and a metal fitting stopper 8 for restricting the insertion amount of the insertion portion 19 projects outward on the electrode connection portion 13 side of the insertion portion 19. Is provided on both sides of the middle portion of the insertion portion 19 and protrudes outward in a semicircular shape. A pressure contact portion 9 is provided, and at a position close to the pressure contact portion 9, a direction orthogonal to the projecting direction of the pressure contact portion 9, that is, if the pressure contact portion 9 projects outward in the horizontal direction, it projects vertically. A semi-circular protrusion 12 is provided, and an insertion portion 19 is further provided.
The distal end portion 15 of the is configured to have a triangular shape for easy insertion. The electrode connecting portion 13 at one end of the resonator fitting 7 is electrically and mechanically connected to the island-shaped electrode 11 provided on the mounting substrate 10 by solder or conductive paste.

The operation of the dielectric resonator configured as described above will be described below with reference to the drawings.

FIG. 2 is a sectional view of a dielectric resonator according to an embodiment of the present invention. In FIG. 2, the protrusion 12
The pressure contact portion 9 is larger than the diameter of the through hole 17 by about 0.06 mm so that the inner conductor 4 is not scraped off when it is inserted, and the space portion 14 is deformed and has elasticity so that the pressure contact portion 9 is always pressure contacted with the inner conductor 4. . Further, the shape of the press contact portion 9 is semicircular or elliptic so that the inner conductor 4 is not damaged. Further, in the protruding portion 12, one set of protruding portions 12 is inscribed in the inner conductor 4, and the insertion portion 19 of the resonator fitting 7 is held in the center. For the material of the metal plate, it is preferable to use bronze, spring material or the like in order to have elasticity.

FIG. 3 is a perspective view of the resonator fitting 7 according to the embodiment of the present invention. In FIG. 3 as well, the metal fitting stopper 8 is always more than 0.
Since it is 5 mm larger and does not reach the outer conductor 5, it does not short-circuit with the outer conductor 5 either. or,
Since the tip portion 15 is always smaller than the diameter of the inner conductor 4 and has an acute angle, it has a function of guiding the resonator fitting 7 to the center during insertion.

FIG. 4 is a side view of the resonator fitting 7 according to the embodiment of the present invention. In FIG. 4, the protrusion 12
The bending is preferably up to 3 times the pressure of the metal plate material or less, and if it is more than that, the spring property is weakened, and therefore it is about 2 times. In the space portion 14, the connection strength can be freely set by changing the width and the thickness. For example,
If the hardness of the dielectric is soft, the space 1 is prevented from cracking due to mechanical stress from the resonator metal fitting 7.
4 can be increased and the pressure contact strength can be weakened.

As described above, since the resonator fitting 7 has horizontal and vertical projections by adding one set of protrusions 12 in the vertical direction of the metal plate in opposite directions, the resonator fitting 7 is always centered. In addition, since the pressure contact portion 9 and the protruding portion 12 are pressed against the inner conductor 4, respectively, even if one of them is not in contact with the inner conductor 4 due to deformation, the other is in contact with the inner conductor 4. Therefore, it is possible to configure a dielectric resonator having excellent electrical stability and connectivity with superior reliability.

Next, a dielectric resonator according to a second embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is a sectional view of a dielectric resonator according to the second embodiment of the present invention. It is provided with a quarter-wavelength dielectric resonator 16 and a resonator metal fitting 7 made of a metal plate to be inserted into the through hole 17, and the resonator metal fitting 7 includes a first pressure contact portion 9a and a second pressure contact portion. 9b, and the protrusion 12 is formed between the first pressure contact portion 9a and the second pressure contact portion 9b. Further, similarly to the first embodiment, the other end of the electrode connecting portion 13 of the resonator fitting 7 is electrically and mechanically connected to the island-shaped electrode 11 provided on the mounting substrate 10 by solder or conductive paste. .

The operation of the dielectric resonator configured as described above will be described below with reference to the drawings.

In FIG. 5 and FIG. 6, in addition to having the same operation and effect as in the first embodiment, even when a pair of opposing pressure contact portions 9a or 9b is deformed by mechanical stress, Since the other undeformed portion or the protruding portion 12 is connected to the inner conductor 4, non-contact and the like are less likely to occur.

Further, the cross-sectional size of the first pressure contact portion 9a is made smaller than that of the second pressure contact portion 9b farther from the tip portion 15, and the so-called taper makes the insertability better. It is necessary to devise it by decreasing the size by 0.03 mm. However, it is premised that the size of the first press-contact portion 9a closest to the tip end portion 15 is at least larger than the diameter of the inner conductor 4 and the press-contact portion 9a is press-contacted at the time of insertion. This allows
The deformation of the resonator fitting 7 and the damage to the inner conductor 4 due to the forcible insertion can be reduced, and the operation and effect superior to those of the first embodiment can be obtained.

Next, the dielectric resonator of the third embodiment will be described with reference to the drawings. FIG. 7 is a sectional view of a dielectric resonator according to the third embodiment of the present invention. It is provided with a quarter-wavelength dielectric resonator 16 and a resonator metal fitting 7 made of a metal plate to be inserted into the through hole 17, and the resonator metal fitting 7 includes a first protrusion 12a and a second protrusion. 1
2b, and the pressure contact portion 9 is configured between the first protrusion 12a and the second protrusion 12b. Further, similarly to the first embodiment, the electrode connecting portion 13 of the resonator fitting 7 is electrically and mechanically connected to the island-shaped electrode 11 provided on the mounting substrate 10 by solder or conductive paste.

The operation of the dielectric resonator configured as above will be described below with reference to the drawings.

7 and 8, in addition to the operation and effect of the first embodiment, the first protrusion 12a and the second protrusion 12b are pressed against the inner conductor 4 in opposite directions. By increasing the cross-sectional dimensions to two sets while appropriately changing the respective cross-sectional dimensions, even when one contradictory set of the first protrusions 12a is deformed by mechanical stress, the one set of the second protrusions that is not deformed is deformed. Since the portion 12b or the press-contact portion 9 is connected to the inner conductor 4, non-contact is less likely to occur. still,
It goes without saying that the first protrusion 12a or the pressure contact portion 9 is similarly connected even when the pair of opposite second protrusions 12b is deformed. However, similar to the second embodiment, the cross-sectional size of the first protruding portion 12a becomes smaller as it gets closer to the tip portion 15, so that the insertability becomes better. Therefore, it is necessary to devise such that the size is reduced by about 0.03 mm. is there.

In addition, the first protruding portion 12a on the tip portion 15 side
Also, the dimension must be larger than the diameter of the lowest inner conductor 4 and pressure-welded. As a result, it is possible to reduce the deformation of the resonator fitting 7 and the damage to the inner conductor 4 due to the forcible insertion, and it is possible to prevent non-contact.

Next, a dielectric resonator of the fourth embodiment will be described with reference to the drawings. FIG. 9 is a sectional view of a dielectric resonator according to the fourth embodiment of the present invention.

A dielectric resonator 16 having a through hole 17;
Resonator metal fitting 7 made of a metal plate to be inserted into the through hole 17
The resonator fitting 7 has a pressure contact portion 9a and a pressure contact portion 9b in a direction that is horizontal and opposite to the insertion portion 19 that pressure contacts the inner conductor 4 that covers the inner peripheral surface of the through hole 17. , The space portion 14a and the space portion 1 in the insertion portion 19 and inside the opposing pressure contact portion 9a and the pressure contact portion 9b in order to give elasticity to the pressure contact portion 9a and the pressure contact portion 9b, respectively.
4b each, and further has a protrusion 12a and a protrusion 12b respectively in the vertical direction in which the pressure contact portion 9a and the pressure contact portion 9b face each other, and the resonator fitting 7 is the same as in the first embodiment.
The electrode connection portion 13 of the island-shaped electrode 11 is provided on the mounting substrate 10.
Electrically and mechanically connected by solder or conductive paste.

The operation of the dielectric resonator configured as described above will be described below with reference to the drawings.

9 and 10 are sectional views of a dielectric resonator according to the fourth embodiment of the present invention.

In FIG. 9 and FIG. 10, in addition to the operation and effect of the first, second and third embodiments, the space portion is provided with the space portion 14a and the space portion 14b. Even when one set of the space portions 14a is deformed by mechanical stress and the one set of the pressure contact portion 9a and the protruding portion 12a are not in contact with the inner conductor 4, the space portion 14b which is not deformed
Since the other pressure contact portion 9b or the protruding portion 12b provided with is connected to the inner conductor 4, non-contact or the like is very unlikely to occur. That is, the difference from the first, second and third embodiments is that a plurality of space portions 14 are formed, and the pressure contact portion 9 and the protruding portion 12 are provided.
Each has a plurality. Therefore, the operation and effect superior to those of the first, second and third embodiments can be obtained.

[0030]

As described above, according to the present invention, the resonator fitting to be connected to the resonator has the elasticity of metal to be pressed and has a space inside, and further has a protrusion in the opposite vertical direction. Therefore, even if the pressure contact portion in either the vertical or horizontal direction becomes non-contact due to deformation, the other pressure contact portion is in contact, so non-contact or semi-contact is unlikely to occur, and it is extremely electrically stable, and Therefore, the dielectric resonator having excellent reliability can be provided.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a dielectric resonator according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a resonator fitting according to the first embodiment of the present invention.

FIG. 4 is a side view of the resonator fitting in the first embodiment of the present invention.

FIG. 5 is a sectional view of a dielectric resonator according to a second embodiment of the present invention.

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

FIG. 7 is a sectional view of a dielectric resonator according to a third embodiment of the present invention.

FIG. 8 is a sectional view of a dielectric resonator according to a third embodiment of the present invention.

FIG. 9 is a sectional view of a dielectric resonator according to a fourth embodiment of the present invention.

FIG. 10 is a sectional view of a dielectric resonator according to a fourth embodiment of the present invention.

FIG. 11 is a sectional view of a conventional dielectric resonator.

FIG. 12 is a perspective view of a conventional metal fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dielectric 2 Short-circuit conductor 3 Short-circuit end 4 Inner conductor 5 Outer conductor 6 Open end 7 Resonator metal fitting 8 Metal fitting stop 9 Pressure contact part 10 Mounting board 11 Island electrode 12 Projection part 13 Electrode connection part 14 Space part 15 Tip part 16 Dielectric Body resonator 17 Through hole 18 Earth electrode 19 Insertion part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Shibukawa 55-12, Ozumi, Osamu, Tanabe-cho, Tsuzuki-gun, Kyoto Prefecture Matsushita Nitto Electric Co., Ltd.

Claims (3)

[Claims] 1. A dielectric resonator in which a through hole is provided from an open end toward an opposite short-circuit end, an inner conductor is provided in the through-hole, an outer conductor is provided on an outer peripheral surface, and a short-circuit conductor is provided at a short-circuit end. When,
And a resonator fitting made of a metal plate to be inserted into the through hole, wherein the resonator fitting has a pressure contact portion in a direction that is horizontal and opposite to the metal plate that pressure contacts the inner conductor coated on the inner peripheral surface of the through hole. In addition to having an opening portion in the metal plate and inside the opposing pressure contact portion in order to have elasticity in the pressure contact portion,
Furthermore, the dielectric resonator which has a protrusion in the perpendicular direction which the said pressure contact part opposes. 2. The dielectric resonance according to claim 1, further comprising a first pressure contact portion and a second pressure contact portion, and the projecting portion is formed between the first pressure contact portion and the second pressure contact portion. vessel. 3. The dielectric resonance according to claim 1, further comprising a first projecting portion and a second projecting portion, wherein the press contact portion is formed between the first projecting portion and the second projecting portion. vessel.