JPH0817282B2 - Dielectric filter - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dielectric filter used in a high frequency band.

2. Description of the Related Art A conventional example of this type of dielectric filter will be described below with reference to FIGS. 9 and 10.

In the figure, 1,2,3,4 are dielectrics formed in a cylindrical shape. It is wrapped in. And, inside the inner peripheral portions 5a, 6a, 7a, 8a of the metal conductors 5, 6, 7, 8, the central conductor 9, 1
0, 11, and 12 are respectively inserted, and the center conductor and the inner peripheral portion of the metal conductor are fixed by solder. Further, one end of the center conductor is inserted into a hole formed in the combined substrate 13 and fixed to the electrodes 14, 15, 16 and 17 formed on the combined substrate by soldering.

Then, the coaxial dielectric resonator configured as described above is housed in the shield case 22 and fixed by soldering to form a dielectric filter. In addition, 18 and 19 are connection terminals, which are fixed to the electrodes 20 and 21 formed on the lower surface of the coupling substrate 13 by soldering.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the production of the dielectric filter having the above-described configuration, it is troublesome to insert a plurality of central conductors into the inner holes of each resonator, resulting in deterioration of productivity. It was connected. In addition, when inserting the center conductor, the length of insertion of the center conductor into the hole inside the metal conductor may vary widely, or the center conductor may be installed tilted in the hole. However, there is a problem that the variation in the characteristics becomes large.

Means for Solving the Problems In order to solve the above problems, according to the present invention, when a resonator is attached to a frame in which a plurality of center conductors are erected, the side surface of the resonator is exposed and the frame is used as a case. Placed inside.

By using the above conductor frame to control the length of the center conductor and its rising angle, the mounting state inside the resonator can be managed, and the resonator can be inserted into the frame outside the case. Can be easily removed from the case.

Example Hereinafter, a first example of the dielectric filter of the present invention will be described with reference to the drawings.

FIG. 3 is a diagram showing a metal frame used in the dielectric filter of the present invention. In the figure, 31,32,33,34 are central conductors, 35,36,37 are dielectric fixing plates, and 38,39 are shields. It is a fixed plate to the case, and these are formed by cutting and raising from the same metal plate. Metal frame configured in this way
30, dielectrics 1,2,3,4 with metal conductors other than the top
As shown in Fig. 4, work for fixing the
The center conductor is inserted into the through holes formed by the inner peripheral portions 5a, 6a, 7a, 8a of the 6, 7, 8. And
The inner peripheral portion of the metal conductor and the central conductor are fixed by solder, and the dielectric fixing plate and the outer peripheral portion of the metal conductor are fixed by solder. At this time, the side surfaces of the dielectrics 1, 2, 3, 4 fixed to the metal frame are exposed. The metal frame having the dielectric fixed in this way is housed in the shield case 22 as shown in FIGS.
The side plate of the shield case 22 is fixed with a metal screw 61.
It should be noted that one end of each of the central conductors 31, 32, 33, 34 is a combined substrate 1.
It is inserted into the hole formed in 3 and is fixed to the electrodes 14, 15, 16, 17 formed on the upper surface thereof by soldering, and 18, 19 are connection terminals, and the combined substrate 13 Are fixed to the electrodes 20 and 21 formed on the lower surface of the with solder.

According to the dielectric filter of the present embodiment as described above, the work of inserting the plurality of center conductors into the inner holes of the respective resonators can be easily performed, and the center conductors of the center conductors can be inserted into the inner holes of the metal conductors. There is little variation in the insertion length, and it is possible to reduce the possibility that the central conductor is inclined and attached in the hole.

 Next, a second embodiment of the present invention will be described.

FIG. 5 is a perspective view of a metal frame for mounting a dielectric body (see FIG. 6) whose outer shape is a rectangular parallelepiped. In the figure, 41, 42, 43, 44 are central conductors, 45, 46, 47, Reference numerals 48, 49 and 50 are dielectric fixing plates, and 51 and 52 are fixing plates to the shield case, which are formed by cutting and raising the same metal plate. In the metal frame 40 configured as described above, a dielectric body whose outer shape is a rectangular parallelepiped except the upper surface is covered with a metal conductor.
As shown in FIG. 6, the work for fixing 53, 54, 55, 56 is performed in the through hole formed by the inner peripheral portions 57a, 58a, 59a, 60a of the metal conductors 57, 58, 59, 60. To the center conductor. Then, the inner peripheral portion of the metal conductor and the central conductor are fixed with solder, and the dielectric fixing plate and the outer peripheral portion of the metal conductor are fixed with solder. The metal frame with the dielectric fixed in this way is housed in the shield case 22 as shown in FIGS. 7 and 8, and the fixing plates 51, 52 and the side plates of the shield case are fixed with metal screws 61. To do. In this embodiment, the same parts as those in the previous embodiment are designated by the same reference numerals and the description thereof is omitted.

Also in the second embodiment, the same effect as in the first embodiment can be obtained.

EFFECTS OF THE INVENTION According to the present invention, when a resonator is attached to a frame in which a plurality of center conductors are erected, the side surfaces of the resonator are exposed and the frame is arranged in a case so that the plurality of center conductors are resonated. It is easy to insert each into the inner hole of the container, there is little variation in the insertion length of the center conductor into the inner hole of the metal conductor, and it is less likely that the center conductor will be installed tilted inside the hole. As a result, a dielectric filter with less variation in characteristics can be obtained.

Also, since the resonator can be inserted into the frame outside the case, the work of attaching the resonator to the frame can be automated, and since the side surface of the resonator is exposed, the resonator can be attached to the frame. The work of attaching the is easy and the productivity is improved.

Also, because the resonator is attached to the frame so that the side surface is exposed, when adjusting the characteristics of the entire dielectric filter by adjusting each resonator, the resonator can be removed without removing the center conductor from the resonator. Can be adjusted, so that the characteristics can be easily adjusted.

Further, since the side surface of the resonator is exposed from the frame, it is easy to find defects such as conductor peeling of the resonator even after the resonator is attached to the frame.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a dielectric filter according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a metal frame (conductor frame) used in the same embodiment. 4 is a perspective view of the metal frame (conductor frame) used for mounting the resonator, FIG. 5 is a perspective view of the metal frame (conductor frame) used in the second embodiment, and FIG. FIG. 7 is an assembly diagram when the resonator is mounted on the metal frame (conductor frame) shown in FIG. 5, FIG. 7 is a longitudinal sectional view of the dielectric filter of the second embodiment of the present invention, and FIG. 8 is FIG. 9 is a longitudinal sectional view of a conventional dielectric filter, and FIG. 10 is a sectional view taken along the line AA of FIG. 1,2,3,4,53,54,55,56 …… Dielectric, 5,6,7,8,57,58,59,60
…… Metal conductor, 13 …… Coupling substrate, 14,15,16,17,20,21…
… Electrodes, 18,19 …… Connection terminals, 22 …… Shield case, 3
0,40 …… Metal frame, 31,32,33,34,41,42,43,44 ……
Central conductor, 35,36,37,45,46,47,48,49,50 …… Dielectric fixing plate, 38,39,51,52 …… Fixing plate,

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiromitsu Taki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-59-133701 (JP, A)

Claims (1)

[Claims] 1. A resonator comprising a frame in which a plurality of center conductors are provided upright, a plurality of resonators inserted in the center conductors, and a case for accommodating the frame in which the resonators are mounted. A dielectric filter, wherein a side surface of the resonator is exposed when the resonator is attached.