JPH07176923A - Manufacture of dielectric filter - Google Patents

Abstract

PURPOSE:To make the characteristic stable by assembling the filter through the overlapping of coupling window electrodes and outer conductors in a way that opening ends of a dielectric surface of resonator holes are directed in the same direction and applying reflowing to the dielectric resonator while its both ends are fixed tentatively with an elastic metallic fixture. CONSTITUTION:A skin surface 5 of a dielectric body to part an inner conductor 3 and an outer conductor 4 is provided in the vicinity of opening of one side of a resonator hole 1. A coupling window electrode 6 is provided in a skin surface of the dielectric body with the outer conductor 4 removed therefrom on an outer side face of the dielectric resonator, and a coupling capacitance is obtained between the inner conductor 3 and the coupling window electrode 6. Plural dielectric resonators 1 are assembled by applying a conductive paste to the coupling window electrodes 6 and the outer conductors 4 and overlapping the coupling window electrodes 6 with each other and the outer conductors 4 with each other in a way that open ends of the dielectric skin surface 5 of the resonator holes 2 are set toward the same direction. The plural dielectric resonators 1 of the composite dielectric resonator are bonded by melting the conductive paste through a reflow furnace while both ends are fixed tentatively with a channel shaped elastic metallic fixture 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention assembles a plurality of individual dielectric resonators to form a composite dielectric resonator, and the composite dielectric resonator is formed by elastic metal fittings, elastic pins or thermosetting resin. The present invention relates to a method of temporarily fixing and manufacturing a dielectric filter by reflow.

[0002]

2. Description of the Related Art Heretofore, as a method of manufacturing a dielectric filter of this type, as shown in FIG. 5, a solder cream 14 is applied to the outer conductor 12 and the coupling window electrode 13 on the joint surface of the dielectric resonator 11. I was soldering through a reflow oven.

[0003]

However, in this conventional manufacturing method, as shown in FIG. 6, there is a drawback that adjacent dielectric resonators 11 and 11 are displaced during reflow and the characteristics are varied. there were. That is, when the adjacent dielectric resonators are displaced, the distance between the coupling window electrode 13 and the outer conductor 12 of the ground is narrowed, the capacitance that drops to the ground is increased, the coupling capacitance is insufficient, and the characteristics are deteriorated. Because I was letting it.

Therefore, it is an object of the present invention to provide a method for manufacturing a dielectric filter in which the assembled composite dielectric resonator is soldered in a predetermined positional relationship without being displaced during reflow, and therefore the characteristics are stable. To do.

[0005]

The invention described in the claims of the present application is as follows. 1. A resonator hole is formed in the dielectric, an inner conductor is provided in the resonator hole, an outer conductor is provided on the outer surface of the dielectric, and an inner conductor and an outer conductor are provided in the vicinity of the opening on one side of the resonator hole. Is provided, and a coupling window electrode is provided in the dielectric surface of the dielectric resonator excluding the outer conductor of at least one outer surface of the dielectric resonator, and A plurality of dielectric resonators designed to obtain the coupling capacitance between the conductor and the coupling window electrode, the coupling window electrodes and the outer conductors so that the open ends of the dielectric holes of the resonator holes face in the same direction. To assemble the composite dielectric resonator,
A method of manufacturing a dielectric filter in which both ends of this composite dielectric resonator are temporarily fixed with elastic metal fittings for reflow.

2. A resonator hole is formed in the dielectric, an inner conductor is provided in the resonator hole, an outer conductor is provided on the outer surface of the dielectric, and an inner conductor and an outer conductor are provided in the vicinity of the opening on one side of the resonator hole. A dielectric ground plane is provided to partition the dielectric resonator, coupling window electrodes are respectively provided in the dielectric ground except for the outer conductor of at least one outer surface of the dielectric resonator, and the resonator hole is provided. A plurality of dielectric resonators for obtaining the coupling capacitance between the inner conductor and the coupling window electrode are stacked, and the coupling window electrodes are stacked so that the open ends of the dielectric grounds of the resonator holes face the same direction. Assembling the composite dielectric resonator, inserting elastic pins into the resonator holes on the short-circuit side of the composite dielectric resonator to temporarily fix the composite dielectric resonator,
A method of manufacturing a dielectric filter for performing reflow.

3. A resonator hole is formed in the dielectric, an inner conductor is provided in the resonator hole, an outer conductor is provided on the outer surface of the dielectric, and an inner conductor and an outer conductor are provided in the vicinity of the opening on one side of the resonator hole. A dielectric ground plane is provided to partition the dielectric resonator, coupling window electrodes are respectively provided in the dielectric ground except for the outer conductor of at least one outer surface of the dielectric resonator, and the resonator hole is provided. A plurality of dielectric resonators for obtaining the coupling capacitance between the inner conductor and the coupling window electrode are stacked, and the coupling window electrodes are stacked so that the open ends of the dielectric grounds of the resonator holes face the same direction. , Assembling the composite dielectric resonator, mounting the composite dielectric resonator on the dielectric substrate, applying a thermosetting resin between the dielectric resonators and between the dielectric resonator and the dielectric substrate, and After thermosetting the thermosetting resin and temporarily fixing the composite dielectric resonator, Method for manufacturing a dielectric filter for over.

[0008]

According to the present invention, the assembled composite dielectric resonator is temporarily fixed with elastic metal fittings, or elastic pins are inserted into the resonator holes to temporarily fix it, or the composite dielectric resonator is placed on a dielectric substrate and heat-treated. Since the reflow is performed after temporary fixing with the curable resin, the adjacent dielectric resonators are soldered in a predetermined positional relationship without shifting during the reflow, so that the coupling capacitance does not change and the characteristics are stable. An object is to provide a method for manufacturing a dielectric filter.

[0009]

【Example】

First Embodiment In FIG. 1, reference numeral 1 denotes a dielectric resonator, which has a resonator hole 2 in which an inner conductor 3 is formed, and an outer surface of the inner conductor 3 is formed. The outer conductor 4 is formed.
A dielectric surface 5 that partitions the inner conductor 3 and the outer conductor 4 is provided near the opening on one side of the resonator hole 2. A coupling window electrode 6 is provided in the ground of the dielectric material excluding the outer conductor 4 on at least one outer surface of the dielectric resonator, and the inner conductor 3 and the coupling window electrode 6 provided in the resonator hole 2 are provided. A coupling capacitance is obtained between the and.

A plurality of such dielectric resonators 1 are coated on the coupling window electrodes 6 and the outer conductors 4 thereof with a conductive paste to connect the coupling window electrodes 6 and the outer conductors 4 to each other in the resonator holes 2. The composite dielectric resonators are assembled by stacking them so that the open ends of the dielectric backgrounds 5 face the same direction. Both ends of this composite dielectric resonator are temporarily fixed by U-shaped elastic metal fittings 7 and passed through a reflow furnace to melt a conductive paste such as solder to bond the composite dielectric resonator.

The U-shaped elastic metal fitting 7 may be one in which the tip end is formed in an inclined shape to increase the elastic force.

Second Embodiment FIG. 3 shows a second embodiment, in which the dielectric resonator 1 is a first resonator.
Since it is the same as the embodiment, the same reference numerals are given and the description thereof is omitted. Similar to the first embodiment, a conductive paste is applied to a plurality of the dielectric resonators 1 to assemble the composite dielectric resonator. In the assembled composite dielectric resonator, in the first embodiment of FIG. 1, the open end side of the dielectric background 5 of the resonator hole faces the front, but in the second embodiment of FIG. The short-circuited end side is facing the front.

From the short-circuited end side of the resonator hole 2 of this composite dielectric resonator, the elastic pin 8 is inserted into the adjacent resonator hole 2 to temporarily fix the composite dielectric resonator and pass it through the reflow furnace. , Melting the conductive paste and joining the composite dielectric resonator.

Like the elastic metal fitting 7, the elastic pin 8 may have a straight tip, or may be crimped or out crimped.

Third Embodiment FIG. 4 shows a third embodiment, in which the dielectric resonator 1 is the first
Since it is the same as the embodiment, the same reference numerals are given and the description thereof is omitted. Similar to the first embodiment, a conductive paste is applied to a plurality of the dielectric resonators 1 to assemble the composite dielectric resonator. The assembled composite dielectric resonator is placed on the dielectric substrate 9, and the thermosetting resin 10 is provided between the adjacent dielectric resonators 1 and 1 and between the dielectric resonator 1 and the dielectric substrate 9. Is applied, the thermosetting resin 10 is heated and cured to temporarily fix the composite dielectric resonator, and then the dielectric filter is manufactured by passing through a reflow furnace.

In the above embodiment, the shape of the dielectric material provided in the vicinity of the opening on one side of the resonator hole is shown only in a state in which it is slightly inserted into the opening of the resonator hole. Since the frequency of the ground surface of the dielectric is adjusted by its position and width, it may be provided at one end of the resonator hole.
Further, the dielectric background provided in the resonator hole may be provided in the vicinity of the openings on both sides of the resonator hole.

[0017]

According to the present invention, the assembled composite dielectric resonator is temporarily fixed by elastic metal fittings, or elastic pins are inserted into the resonator holes to temporarily fix it, or it is placed on a dielectric substrate. Since the reflow is performed after temporarily fixing with thermosetting resin, the adjacent dielectric resonators are soldered in a predetermined positional relationship without shifting during reflow, so that the coupling capacitance does not change and the characteristic It is possible to manufacture a stable dielectric filter.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a first embodiment.

2 is a schematic sectional view taken along line XX of FIG.

FIG. 3 is an exploded perspective view of the second embodiment.

FIG. 4 is an exploded perspective view of a third embodiment.

FIG. 5 is a developed perspective view of a conventional example.

FIG. 6 is an explanatory diagram after reflow in a conventional example.

[Explanation of symbols]

 1 Dielectric Resonator 2 Resonator Hole 3 Inner Conductor 4 Outer Conductor 5 Ground Surface 6 Coupling Window Electrode 7 Elastic Metal Fitting 8 Elastic Pin 9 Dielectric Substrate 10 Thermosetting Resin

Claims (3)

[Claims] 1. A resonator hole is formed in a dielectric body, an inner conductor is provided in the resonator hole, an outer conductor is provided on an outer surface of the dielectric body, and an opening is provided near one side of the resonator hole. A dielectric ground plane for partitioning the inner conductor and the outer conductor is provided, and a coupling window electrode is provided in the dielectric ground plane excluding the outer conductor of at least one outer surface of the dielectric resonator, and a resonator hole. A plurality of dielectric resonators for obtaining a coupling capacitance between the inner conductor and the coupling window electrode, the coupling window electrode and the outer conductor are arranged so that the open end side of the dielectric ground of the resonator hole is A method of manufacturing a dielectric filter in which composite dielectric resonators are assembled so that they face in the same direction, the composite dielectric resonators are assembled, and both ends of the composite dielectric resonator are temporarily fixed with elastic metal fittings for reflow. 2. A resonator hole is formed in a dielectric body, an inner conductor is provided in the resonator hole, an outer conductor is provided on an outer surface of the dielectric body, and an opening on one side of the resonator hole is provided near the opening. A dielectric ground plane for partitioning the inner conductor and the outer conductor is provided, and coupling window electrodes are respectively provided in the dielectric ground plane excluding the outer conductor of at least one outer surface of the dielectric resonator, and the resonator. A plurality of dielectric resonators for obtaining the coupling capacitance between the inner conductor provided in the hole and the coupling window electrode, the coupling window electrodes are connected to each other, and the open end side of the dielectric ground of the resonator hole is in the same direction. Assemble the composite dielectric resonators so that they face each other,
A method of manufacturing a dielectric filter in which an elastic pin is inserted into an adjacent resonator hole on the short-circuit side of the composite dielectric resonator to temporarily fix the composite dielectric resonator and reflow is performed. 3. A resonator hole is formed in a dielectric body, an inner conductor is provided in the resonator hole, an outer conductor is provided on an outer side surface of the dielectric body, and an opening on one side of the resonator hole is provided near the opening. A dielectric ground plane for partitioning the inner conductor and the outer conductor is provided, and coupling window electrodes are respectively provided in the dielectric ground plane excluding the outer conductor of at least one outer surface of the dielectric resonator, and the resonator. A plurality of dielectric resonators for obtaining the coupling capacitance between the inner conductor provided in the hole and the coupling window electrode, the coupling window electrodes are connected to each other, and the open end side of the dielectric ground of the resonator hole is in the same direction. Assemble the composite dielectric resonators so that they face each other,
This composite dielectric resonator is placed on a dielectric substrate, a thermosetting resin is applied between the dielectric resonators and between the dielectric resonator and the dielectric substrate, and the thermosetting resin is cured by heating to form a composite. A method for manufacturing a dielectric filter, which comprises re-flowing after temporarily fixing a dielectric resonator.