JPH06310910A - Dielectric filter and its manufacture - Google Patents

Abstract

PURPOSE:To improve the workability of assembling. CONSTITUTION:Dielectric coaxial resonators 2 are fixed by using an adhesives 20 or a resin or the like before each dielectric coaxial resonator 2 soldered and fixed to a board 11 is put in a case 17. Thus, the dielectric coaxial resonator 2 is not moved and the workability of assembling is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, a car telephone,
The present invention relates to a dielectric filter used in mobile communication devices such as mobile phones.

[0002]

2. Description of the Related Art FIG. 2 shows an exploded perspective view of a conventional dielectric filter 1, in which a plurality of dielectric coaxial resonators 2 are mounted by soldering on an upper surface of a substrate 11 made of a thin plate dielectric. It has become. FIG. 3 shows a sectional view of the dielectric coaxial resonator 2. In FIG. 3, a hole 4 is drilled through a rectangular parallelepiped dielectric block 3 made of a dielectric material, and an electrode film is formed on the outer peripheral surface of the dielectric block 3 except one end side (the left side in the drawing). Has been formed.

This electrode film is used as the outer conductor 5, one end surface where the outer conductor 5 is not formed is an open surface 3a, and the other end surface on the right side of FIG. 3 where the outer conductor 5 is formed is a short circuit surface 3b. There is. The outer conductor 5 is used as a ground electrode. Further, an electrode film is formed on the inner peripheral surface of the hole 4 drilled in the dielectric block 3, and this electrode film is used as the inner conductor 6.

As shown in FIG. 3, a metallic connecting terminal 10 is press-fitted into the hole 4 of the dielectric coaxial resonator 2 so as to come into contact with the inner conductor 6 inside to obtain conduction. . The connection terminal 10 has a substantially cylindrical portion press-fitted into the hole 4 of the dielectric coaxial resonator 2 and is formed into two cracks, so that the connection terminal 10 is easily press-fitted into the hole 4. Also, the connection terminal 1
The other of 0 is formed in a flat plate shape and is bent into a substantially L shape.

In FIG. 2, a plurality of capacitor electrode films 12 are formed at predetermined intervals on the upper surface of a substrate 11 made of a dielectric material. Then, the connection terminals 10 derived from the dielectric coaxial resonators 2 are placed on the upper surfaces of the capacitor electrode films 12 of the substrate 11, and the connection terminals 10 and the capacitor electrode films 12 are fixed by soldering. ing. Reference numeral 16 is a coil for LC resonance based on a lumped constant, and one of the capacitor electrode films 12 at the end formed on the substrate 11 and the coil 16 form a resonance circuit.

In the example shown in FIG. 2, four dielectric coaxial resonators 2, three dielectric coaxial resonators 2 and the coil 16 are provided.
And the like form a bandpass filter. The dielectric filter 1 composed of two bandpass filters is used as an antenna duplexer. Therefore, the pin-shaped input / output terminal 13 connected to the transmitter side is inserted into one end of the board 11 and mounted in the hole formed in the board 11. The lower part of the input / output terminal 13 is inserted into the case 17 through a hole formed in the bottom surface of the case 17.
Is projected from the lower surface of.

A pin-shaped input / output terminal 14 connected to the antenna side is inserted into a hole formed in the substrate 11 and mounted at substantially the center of the substrate 11. And this input / output terminal 1
The lower part of 4 is provided so as to project from the lower surface of the case 17 through a hole drilled in the bottom surface of the case 17. Similarly, the substrate 11
On the other end side, a pin-shaped input / output terminal 15 connected to the receiving side is inserted into a hole formed in the substrate 11 and mounted. The lower portion of the input / output terminal 15 is provided so as to project from the lower surface of the case 17 through a hole formed in the bottom surface of the case 17. Each of the input / output terminals 13 to 15 projects from the case 17 and is connected to an external circuit.

The case 17 is made of metal and is formed in a substantially U-shape with an upper surface opened. The dielectric coaxial resonator 2 soldered to the substrate 11 is housed in the case 17, and the upper side plate of the case 17 is mounted. The case 17 and the respective dielectric coaxial resonators 2 are soldered to each other through a plurality of horizontally elongated holes 18 formed in the hole. In addition, the hole 1 formed in the side plate of the case 17
Reference numeral 9 denotes a jig insertion hole, and a jig is inserted through the hole 19 to scrape the outer conductor 5 on the outer surface of the dielectric coaxial resonator 2 to adjust the characteristics of the filter.

FIG. 4 is a block diagram of the dielectric filter 1, which is composed of two band pass filters as described above, and the input / output terminal 13 is on the transmitter side and the input / output terminal 14
Is connected to the antenna side, and the input / output terminal 15 is connected to the receiving section side.

[0010]

In the dielectric filter 1 of the conventional example, assembling is performed by first connecting the tip of the connecting terminal 10 extending from each dielectric coaxial resonator 2 to each capacitor electrode film on the substrate 11. 12 to the dielectric coaxial resonator 2 by reflow soldering or the like.
And the board 11 are soldered and assembled. Next, substrate 1
1 and the dielectric coaxial resonator 2 fixed by soldering to the case 17
Put it inside. At this time, for example, a part of the case 17 is folded back, and the lower surface of the substrate 11 is brought into contact with the upper end of the case 17, and a space is provided between the bottom surface of the case 17 and the lower surface of the substrate 11 to form the dielectric coaxial resonator 2. The connected board 11 is arranged.

However, when the plurality of dielectric coaxial resonators 2 are housed in the case 17 together with the substrate 11, the plurality of dielectric coaxial resonators 2 remain in a state in which they easily move with each other. There was a problem that the dielectric coaxial resonator 2 was caught on the edge and it was difficult to smoothly install.

The present invention has been made in view of the above points, and provides a dielectric filter and a method of manufacturing the same for the purpose of improving the workability of assembly.

[0013]

According to the present invention, a substrate having a plurality of electrode films arranged in a row on its upper surface, a plurality of dielectric coaxial resonators mounted on the upper surface of the substrate in a substantially straight line shape, and a dielectric resonator for these dielectric resonators are provided. A dielectric filter comprising a connection terminal which is respectively led out from a body coaxial resonator and is soldered to the electrode film of the substrate, and a case which is soldered and fixed to each of the dielectric coaxial resonators after mounting inside, Before mounting the dielectric coaxial resonators in the case, the dielectric coaxial resonators are fixed by a fixing means.

According to a second aspect of the present invention, the connection terminals derived from the plurality of dielectric coaxial resonators are soldered to the respective capacitor electrode films formed on the upper surface of the substrate, and after the soldering, the respective dielectric coaxial resonances. Each of the dielectric coaxial resonators fixed to each other by fixing means is mounted in a metal case, and then each dielectric coaxial resonator and the case are soldered.

[0015]

According to the present invention, since the dielectric coaxial resonators are fixed by the fixing means before the dielectric coaxial resonators are put in the case, the dielectric coaxial resonators are fixed to the case during the mounting. It will not get caught and the workability of assembly can be improved.

According to a second aspect of the present invention, the connection terminals derived from the plurality of dielectric coaxial resonators are soldered to the respective capacitor electrode films formed on the upper surface of the substrate, and after the soldering, the respective dielectric coaxial resonators are soldered. The resonators are fixed by fixing means, and each dielectric coaxial resonator coupled to the substrate is housed in a metal case, and then each dielectric coaxial resonator and the case are soldered. As a result, as in the case of the first aspect, the dielectric coaxial resonator does not get caught in the case at the time of packaging, and the workability of assembly can be improved.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of an entire dielectric filter 1 according to an embodiment of the present invention. Since the structure of the dielectric filter 1 itself is the same as that of the conventional example, the same parts are designated by the same reference numerals and described. It is omitted, and the gist of the present invention will be described in detail.

That is, according to the present invention, before the dielectric coaxial resonators 2 soldered and fixed to the substrate 11 are put in the case 17, the dielectric coaxial resonators 2 are fixed by the adhesive 20 as a fixing means. It is something that is done. A resin is used instead of the adhesive 20 to form each dielectric coaxial resonator 2
May be fixed.

That is, after the connection terminals 10 derived from the respective dielectric coaxial resonators 2 and the respective capacitor electrode films 12 of the substrate 11 are fixed by soldering, the respective dielectric coaxial resonators 2 are fixed by the adhesive 20. . Then, each dielectric coaxial resonator 2 coupled with the substrate 11 is put in the case 17,
The side plate of the case 17 and the side surface of the dielectric coaxial resonator 2 are soldered through the hole 18 of the case 17 to fix each dielectric coaxial resonator 2 to the case 17. Therefore, each dielectric coaxial resonator 2 is fixed to the case 17, and the substrate 11 is fixed to each dielectric coaxial resonator 2.

Further, in the above description, after fixing the substrate 11 and the dielectric coaxial resonator 2 by soldering, the adhesive 20 is used to fix the respective dielectric coaxial resonators 2 to each other. The following method may be used. That is, the connection terminals 10 from the dielectric coaxial resonator 2 and the capacitor electrode film 12 of the substrate 11 are temporarily fixed with a solder paste, and the space between the dielectric coaxial resonators 2 is an adhesive 20 (or resin). Fix at. Then, during the reflow soldering, the connection terminals 10 and the capacitor electrode film 12 are soldered, and at the same time, the adhesive or resin is melted and hardened to fix the dielectric coaxial resonators 2 to each other. .

As described above, by fixing the dielectric coaxial resonators 2 with an adhesive or a resin, the dielectric coaxial resonators 2 do not move, and the case 17 is housed in the case 17. No longer gets caught in
The workability of assembly can be improved.

It should be noted that, in the above-mentioned embodiment, 3 stages to 4 stages.
Although the resonator configuration has a step, the number of the dielectric coaxial resonators 2 is not limited. Further, although the antenna duplexer using two bandpass filters has been described, the present invention can also be applied to a single configuration of a lowpass filter, a highpass filter, a band elimination filter, or a combination of the above filters. is there.

[0023]

According to the present invention, a substrate having a plurality of electrode films arranged in a row on its upper surface, a plurality of dielectric coaxial resonators mounted on the upper surface of the substrate in a substantially linear shape, and these dielectric coaxial resonators A dielectric filter comprising a connection terminal which is respectively led out from a resonator and is connected to the electrode film of the substrate by soldering, and a case which is soldered and fixed to each of the dielectric coaxial resonators after being housed inside. Since the dielectric coaxial resonators are fixed by fixing means before mounting each of the dielectric coaxial resonators, when the dielectric coaxial resonators are put in the case, the dielectric coaxial resonance The container is prevented from being caught in the case, and the workability of assembly can be improved.

According to a second aspect of the present invention, the connection terminals derived from the plurality of dielectric coaxial resonators are soldered to the respective capacitor electrode films formed on the upper surface of the substrate, and after the soldering, the respective dielectric coaxial resonators are soldered. The resonators are fixed by fixing means, and each dielectric coaxial resonator coupled to the substrate is housed in a metal case, and then each dielectric coaxial resonator and the case are soldered. As a result, as in the case of claim 1, when the dielectric coaxial resonators soldered and fixed to the substrate are put in the case, the dielectric coaxial resonators are not caught in the case, and the workability of assembly is improved. Can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an entire dielectric filter according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of an entire conventional dielectric filter.

FIG. 3 is a cross-sectional view of a dielectric coaxial resonator.

FIG. 4 is a block diagram of a dielectric filter.

[Explanation of symbols]

 1 Dielectric Filter 2 Dielectric Coaxial Resonator 3 Dielectric Block 5 Outer Conductor 6 Inner Conductor 10 Connection Terminal 11 Substrate 12 Capacitor Electrode Film 17 Case 20 Adhesive

Claims (2)

[Claims] 1. A substrate having a plurality of electrode films arranged in a row on its upper surface, a plurality of dielectric coaxial resonators mounted on the upper surface of the substrate in a substantially straight line, and derived from these dielectric coaxial resonators, respectively. In a dielectric filter consisting of a connection terminal to be soldered to the electrode film of the substrate, and a case to be soldered and fixed to each of the dielectric coaxial resonators after mounting inside,
A dielectric filter, characterized in that the dielectric coaxial resonators are fixed by fixing means before the dielectric coaxial resonators are installed in the case. 2. A connection terminal derived from a plurality of dielectric coaxial resonators is soldered to each capacitor electrode film formed on the upper surface of the substrate, and after the soldering, a fixing means is provided between the dielectric coaxial resonators. A dielectric filter characterized in that each of the dielectric coaxial resonators fixed and coupled to the substrate is housed in a metal case, and then each of the dielectric coaxial resonators and the case are soldered. Manufacturing method.