JP3371466B2 - Manufacturing method of dielectric filter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
Dielectric filter used in mobile communication devices such as mobile phones
And a method for producing the same. FIG. 2 is an exploded perspective view of a conventional dielectric filter 1, in which a plurality of dielectric coaxial resonators 2 are mounted on an upper surface of a substrate 11 made of a thin plate-like dielectric by soldering. It is supposed to be. FIG. 3 is a sectional view of the dielectric coaxial resonator 2. In FIG. 3, a rectangular parallelepiped dielectric block 3 made of a dielectric has a hole 4 penetrating therethrough, and an electrode film is formed on the outer peripheral surface of the dielectric block 3 except for one end side (left side in the figure). Is formed. [0003] This electrode film is used as the outer conductor 5, one end surface on which the outer conductor 5 is not formed is an open surface 3a, and the other end surface on the right side of FIG. 3 on which the outer conductor 5 is formed is a short-circuit surface 3b. I have. The outer conductor 5 is used as a ground electrode. An electrode film is formed on the inner peripheral surface of the hole 4 formed in the dielectric block 3, and this electrode film is used as the inner conductor 6. As shown in FIG. 3, a metal connection terminal 10 is press-fitted into a hole 4 of the dielectric coaxial resonator 2 so as to come into contact with an inner conductor 6 therein to obtain conduction. . The portion of the connection terminal 10 that is press-fitted into the hole 4 of the dielectric coaxial resonator 2 is substantially cylindrical and is formed into two cracks, and is formed so as to be easily press-fitted into the hole 4. Also, connection terminal 1
The other of 0 is formed in a flat plate shape and is bent substantially in an L shape. In FIG. 2, a plurality of capacitor electrode films 12 are formed at predetermined intervals on an upper surface of a substrate 11 made of a dielectric material. The connection terminals 10 derived from the dielectric coaxial resonators 2 are mounted 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 denotes a coil for LC resonance based on a lumped constant, and a resonance circuit is formed by one of the capacitor electrode films 12 at the end formed on the substrate 11 and the coil 16. In the example shown in FIG. 2, four dielectric coaxial resonators 2, three dielectric coaxial resonators 2 and the coil 16
And so on constitute a bandpass filter. The dielectric filter 1 composed of two band-pass filters is used as an antenna duplexer. Accordingly, a pin-shaped input / output terminal 13 connected to the transmitting unit side is mounted on one end of the substrate 11 by being inserted into a hole formed in the substrate 11. The lower part of the input / output terminal 13 is connected to the case 17 through a hole formed in the bottom of the case 17.
Is protruded from the lower surface. A pin-shaped input / output terminal 14 connected to the antenna side is mounted at substantially the center of the substrate 11 by inserting it into a hole formed in the substrate 11. And this input / output terminal 1
The lower part of 4 protrudes from the lower surface of case 17 through a hole drilled in the bottom surface of case 17. Similarly, the substrate 11
On the other end side, a pin-shaped input / output terminal 15 connected to the receiving unit side is mounted by being inserted into a hole formed in the substrate 11. The lower portion of the input / output terminal 15 is protruded 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 protrudes 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 open upper surface. The dielectric coaxial resonator 2 soldered to the substrate 11 is housed in the case 17, and the upper part of the side plate of the case 17 is provided. The case 17 and each of the dielectric coaxial resonators 2 are soldered through a plurality of horizontally long holes 18 formed in the substrate. The hole 1 formed in the side plate of the case 17
Reference numeral 9 denotes a jig insertion hole. The jig is inserted through the hole 19 to cut 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.
Is connected to the antenna side, and the input / output terminal 15 is connected to the receiving section side. [0010] In such a conventional dielectric filter 1, first, the tip of the connection terminal 10 derived from each of the dielectric coaxial resonators 2 is attached to each of the substrates 11. The dielectric coaxial resonator 2 is connected to the capacitor electrode film 12 via solder paste, and is reflow soldered.
And the substrate 11 are assembled by soldering. Next, the substrate 1
1 and a dielectric coaxial resonator 2 fixed by soldering
Inside. At this time, for example, a part of the case 17 is turned back, and the lower surface of the substrate 11 is brought into contact with the upper end thereof, and a space is provided between the bottom surface of the case 17 and the lower surface of the substrate 11 so that the dielectric coaxial resonator 2 The connected substrate 11 is provided. 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 where they can 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 mount the resonator. [0012] The present invention was provided in view of the above, there is provided a method of manufacturing dielectrics filter for the purpose of improving the workability of assembly. According to the present invention, connection terminals derived from a plurality of dielectric coaxial resonators are soldered to respective capacitor electrode films formed on the upper surface of a substrate, and after this soldering, Each dielectric coaxial resonator is fixed by a fixing means, each dielectric coaxial resonator coupled to the substrate is placed in a metal case, and then each dielectric coaxial resonator and the case are soldered. Like that. According to 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 this 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 placed in a metal case,
By subsequently so that the respective dielectric coaxial resonators and the case for soldering, when the paid instrumentation, prevents the dielectric coaxial resonator is caught in the case, to improve the workability of assembly Can be. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the whole of a dielectric filter 1 according to an embodiment of the present invention. Since the configuration of the dielectric filter 1 itself is the same as that of the conventional example, the same portions are denoted by the same reference numerals and will be described. The description will be omitted, and the gist of the present invention will be described in detail. That is, in the present invention, before each dielectric coaxial resonator 2 soldered and fixed to the substrate 11 is put into the case 17, the dielectric coaxial resonators 2 are fixed by the adhesive 20 as fixing means. It is something to do. Note that each of the dielectric coaxial resonators 2 is made of resin instead of the adhesive 20.
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 respectively fixed by soldering, the respective dielectric coaxial resonators 2 are fixed by the adhesive 20. . Then, each of the dielectric coaxial resonators 2 coupled to the substrate 11 is placed in a case 17 and
Each dielectric coaxial resonator 2 is fixed to the case 17 by soldering the side plate of the case 17 and the side surface of the dielectric coaxial resonator 2 through the hole 18 of 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. In the above description, the substrate 11 and the dielectric coaxial resonator 2 are fixed by soldering, and then the dielectric coaxial resonators 2 are fixed using the adhesive 20. The following method may be used. That is, the connection terminal 10 from the dielectric coaxial resonator 2 and the capacitor electrode film 12 of the substrate 11 are temporarily fixed via a solder paste, and the gap between the dielectric coaxial resonators 2 is an adhesive 20 (or resin). Fix with. At the time of reflow soldering, the connection terminals 10 and the capacitor electrode film 12 are soldered, and at the same time, an adhesive or a resin is melted and hardened, thereby fixing between the dielectric coaxial resonators 2. . As described above, by fixing the dielectric coaxial resonators 2 with an adhesive or a resin or the like, the respective dielectric coaxial resonators 2 do not move. No longer get caught in
The workability of assembling can be improved. In the above embodiment, three to four stages are used.
Although the resonator configuration is a stage, the number of dielectric coaxial resonators 2 is not limited. In addition, the present invention has been described as an antenna duplexer using two bandpass filters. However, the present invention can be applied to a single configuration of a lowpass filter, a highpass filter, and a band elimination filter, or a combination of the above filters. is there. According to 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. The coaxial resonators are fixed by fixing means, each dielectric coaxial resonator coupled to the substrate is placed in a metal case, and then each dielectric coaxial resonator and the case are soldered. and it has, when put the dielectric coaxial resonators fixed board and soldered in to case, prevents the dielectric coaxial resonator is caught in the case,
The workability of assembling can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall exploded perspective view of a dielectric filter according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the whole of a conventional dielectric filter. FIG. 3 is a sectional view of a dielectric coaxial resonator. FIG. 4 is a block diagram of a dielectric filter. [Description of Signs] 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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-347906 (JP, A) JP-A-3-115403 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01P 11/00 H01P 1/205 H01P 1/213

Claims (1)

(57) [Claims 1] A connection terminal derived from a plurality of dielectric coaxial resonators is soldered to each capacitor electrode film formed on the upper surface of a substrate, and after this soldering, each of the dielectric electrodes is formed. The body coaxial resonators are fixed by fixing means, each dielectric coaxial resonator coupled to the substrate is placed in a metal case, and then each dielectric coaxial resonator and the case are soldered. A method for manufacturing a dielectric filter .