JPH0832322A - Dielectric coaxial resonator - Google Patents

Abstract

PURPOSE:To simplify electrical connection by inserting the bent tongue piece of a coupling terminal through a through-hole provided in a dielectric and elastically connecting a peak end on the extended side of the tongue piece, a tip and the inner side of calyx edges to an electrically conductive layer provided on the inner surface of the through-hole. CONSTITUTION:This dielectric coaxial resonator 1 is constituted with the dielectric 2 formed by using a titanium oxide ceramic material as a base body, it is turned to a rectangular parallelopiped shape and the through-hole 3 is formed at the center. In the dielectric 2, the electrically conductive layer 4 positioned on the inner peripheral surface of the through-hole 3 is formed, the electrically conductive layers 5 are provided on the side peripheral surfaces and the short-circuit surface of the dielectric 2 as well and remaining one end face is turned to an open end face 6. The coupling terminal 10 is inserted from the end face 6 to the through- hole 3, the bent tongue piece 11 whose extension width is wider than the inner diameter of the through-hole 3 is extended forward from a calyx part 14 projecting to both sides and a connection branch 15 is continuously formed from the center part of the calyx part 14 in an inclined direction. The tongue piece 11 of the terminal 10 is inserted to the through- hole 3 and the calyx part 14 is pushed in to a position where it is abutted to an open end edge. Thus, the terminal 10 is connected to the dielectric 2 and the electrical connection to the electrically conductive layer 4 inside the through-hole 3 is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric coaxial resonator used in various wireless communication devices such as a car phone and a mobile phone, and more particularly, it has a through hole inside and is inserted and fixed in the through hole. The present invention relates to a dielectric coaxial resonator provided with a coupling terminal.

[0002]

2. Description of the Related Art As a dielectric coaxial resonator of this type, B
aO—TiO ₂ — A rare earth-based material having a large dielectric constant and no load Q, and a through hole formed inside a dielectric material formed of a ceramic material having a small temperature coefficient of resonance frequency. It is known that a conductive layer made of a metal such as silver or copper is applied to the inner surface, the side peripheral surface, and the end surface on the short-circuit side of the through hole by a coating means such as plating or plating.

Since the conductive layer adhered to the through hole of such a resonator is often connected to an external circuit through a capacitor, conventionally, as shown in FIG. 3, cream solder or conductive adhesive is applied to the surface. A coupling terminal d having an elastic cylindrical portion e to which a conductive bonding agent such as a material was previously applied was press-fitted into the through hole b from the open end face of the resonator a, and then heated and fixed.

[0004]

However, the coupling terminal d used in the conventional resonator has a three-dimensional structure formed by extending the connection branch f from the end of the elastic cylindrical portion e,
Therefore, there is a problem that the formation of the coupling terminal d is troublesome and the manufacturing cost is high.

An object of the present invention is to eliminate the problems of the conventional structure.

[0006]

According to the present invention, a dielectric having a through hole inside is coated with a conductive layer on the inner surface, the side peripheral surface and the short-circuit end surface of the through hole, and the dielectric layer is opened to the through hole. In a dielectric coaxial resonator formed by fitting a coupling terminal from the end face side and electrically connecting to the conductive layer on the inner surface of the through hole,
From the collar edge that abuts the mouth end of the through hole, the coupling terminal extends a curved tongue piece, which has a width wider than the inner diameter of the through hole, and a connecting branch extends rearward from the collar edge. The curved tongue piece of the coupling terminal is inserted into the through hole, and the curved tongue piece is pressed against the conductive layer on the inner surface of the through hole.

[0007]

When the curved tongue of the coupling terminal is inserted into the through hole of the dielectric, the top end of the curved tongue on the projecting side and the inside of the tip and the brim are elastically contacted with the conductive layer on the inner surface of the through hole. The coupling terminal is connected to the dielectric and electrically connected to the conductive layer in the through hole.

In this structure, the coupling terminal is easily formed by punching a plate material into a curved shape.

[0009]

1 and 2 show a dielectric coaxial resonator 1 according to an embodiment of the present invention.

Here, the dielectric coaxial resonator 1 is composed of a dielectric 2 molded from a ceramic material such as titanium oxide as a base, has a rectangular parallelepiped shape, and a through hole 3 is formed at the center thereof. . The through hole 3 is formed in the dielectric 2.
The conductive layer 4 is formed on the inner peripheral surface of the above, and the conductive layer 5 is formed on the side peripheral surface and the short-circuit surface of the dielectric 2. The remaining one end face is the open end face 6.

In this structure, the coupling terminal 10 is inserted into the through hole 3 from the open end surface 6.

The connecting terminal 10 has a curved tongue piece, which has a width larger than the inner diameter of the through hole and extends forward from the flange portion 14 protruding on both sides, and is inclined from the central portion of the flange portion 14 in the direction of inclination. It is configured by connecting the connection branches 15. The coupling terminal 10 is easily formed by punching. The coupling terminal 10 is configured by extending a curved tongue piece 11 forward from a collar portion 14 projecting on both sides and connecting a connecting branch 15 in an inclined direction from a central portion of the collar portion 14. . The coupling terminal 10 is easily formed by punching. The protruding width w of the curved tongue piece 11 is larger than the inner diameter of the through hole 3.

In such a structure, as shown in FIG.
Insert the curved tongue piece 11 of the coupling terminal 10 into the through hole 3,
The collar 14 is pushed to a position where it comes into contact with the open edge.

As a result, as shown in the figure, the curved tongue piece 11 has its overhanging width w made larger than the inner diameter of the through hole 3 in advance, so that the curved tongue piece 11 is curved by the peripheral wall of the through hole 3 as it is inserted. The tongue piece 11 is compressed in the flat direction on the front and back sides thereof, and due to its restoring elasticity, the curved tongue piece 11 is
The projecting end and the tip and the inside of the brim are elastically contacted with the conductive layer 4 on the inner surface of the through hole 3 and held at three points, whereby the coupling terminal 10 is connected to the dielectric 2 and the through hole is formed. The conductive layer 4 in 3 is electrically connected. Then, in this holding state, only the connecting branch 15 projects outward from the open end surface 6 of the dielectric coaxial resonator 1.

In order to secure the mechanical connection of the coupling terminal 10 and the electrical connection between the conductive layer 4 and the curved tongue piece 11, cream solder or conductive adhesive is applied between the inner surface of the through hole 3 and the curved tongue piece 11. You may make it interpose the electroconductive bonding agent which consists of an agent. The conductive bonding agent is supplied by applying the conductive bonding agent to the front and back surfaces of the curved tongue piece 11 in advance, and then inserting the curved tongue piece 11 into the through hole 3, or by bending the curved tongue piece. After inserting 11, the conductive bonding agent is injected into the through hole 3. After such supply, the conductive bonding agent is melted and fixed by heating through reflow.

In such a structure, a conductive bonding agent is filled in the gap formed between the inner surface of the through hole 3 and the outer peripheral surface of the curved tongue piece 11. Therefore, due to the bonding force of the conductive bonding agent, The coupling terminal 10 is bonded to the dielectric coaxial resonator 1 with high strength, and the conductivity is secured.

Thus, the coupling terminal 10 is coupled in the through hole 3 while maintaining a required strength, and an external circuit is connected to the connecting branch 15 via a capacitor.

[0018]

According to the present invention, the coupling terminal 10 is formed by extending the curved tongue piece 11 having a larger width than the inner diameter of the through hole 3 from the brim flange portion 14 that abuts the mouth end of the through hole 3. A connecting branch 15 is formed to extend rearward from the brim flange portion 14, and the curved tongue piece 11 of the coupling terminal 10 is inserted into the through hole 3 of the dielectric body 2, whereby the protruding side of the curved tongue piece 11 is extended. Of the through hole 3 is elastically contacted with the conductive layer 4 of the through hole 3 by the top end of the through hole and the inside of the brim, whereby the coupling terminal 10 is supported at three points in the through hole 3 and is connected to the dielectric body 2. Conductive layer 4 in 3
Therefore, the coupling terminal 10 can be easily formed by punching a plate material, has an excellent effect such as easy manufacture and low cost. is there.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a dielectric coaxial resonator 1. FIG.

FIG. 2 is a vertical sectional side view of the dielectric coaxial resonator 1 showing a coupling state of coupling terminals 10.

FIG. 3 is an exploded perspective view showing a conventional configuration.

[Explanation of symbols]

 1 Dielectric Coaxial Resonator 2 Dielectric 3 Through Hole 4 Conductive Layer 10 Coupling Terminal 11 Curved Tongue 14 Collar 15 Connection Branch

Claims (1)

[Claims] 1. A dielectric having a through hole inside, a conductive layer is applied to an inner surface, a side peripheral surface and a short-circuit end surface of the through hole, and a coupling terminal is fitted into the through hole from an open end surface side. Then, in the dielectric coaxial resonator electrically connected to the conductive layer on the inner surface of the through hole, the coupling terminal, from the brim that abuts the mouth end of the through hole, forward from the inner diameter of the through hole. A curved tongue piece having a large overhanging width is formed, and a connecting branch is formed to extend rearward from the brim edge. The curved tongue piece of the coupling terminal is inserted into the through hole, and the curved tongue piece is inserted into the through hole. A dielectric coaxial resonator, characterized in that it is in pressure contact with a conductive layer on the inner surface.