JPH0546321Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to improvements in dielectric filters used in satellite communications, car telephones, and other communication equipment in the microwave band.

(Summary of the invention) The present invention is a dielectric filter used in microwave band communication equipment, etc., in which an outer surface substantially parallel to the arrangement direction of a plurality of through conductive parts of the dielectric filter is used as a board mounting surface. It is designed so that it can be placed horizontally with respect to the board.

(Prior Art) Fig. 3 shows a conventional dielectric filter of this type, which is called an integrated compact filter in which a plurality of through conductive parts 1 constituting a resonant part are formed in one dielectric block 2. be. Here, each through conductive part 1 is usually a through hole with a conductive film formed on the inner surface.
A conductive film 3 connected to the through conductive portion 1 is formed on the outer surface of the dielectric block (the bottom surface and four side surfaces where the through conductive portion is present). In addition, each through conductive portion 1
The open end surface 6 of the dielectric block 2 where the open end of the dielectric block 2 is located is a portion on which no conductive film is formed.

(Problems to be Solved by the Invention) By the way, in the conventional dielectric filter shown in FIG. Although the conductive portion 1 is fitted into the conductive portion 1, the inside of the through conductive portion 1 is a round through hole, and if left as is, the center conductor 4 will be twisted (rotated), resulting in the inconvenience that the position cannot be determined. Therefore, it was necessary to add another structure to prevent twisting or to fix the input/output terminal section 5 with adhesive.

Further, the mounting surface to the substrate or the like is the bottom surface perpendicular to the through conductive portion 1, and the height of the dielectric filter is defined by the length of the through conductive portion 1, making it difficult to reduce the height.

(Means for Solving the Problems) In view of the above points, the present invention provides a dielectric block with an outer surface substantially parallel to the arrangement direction of a plurality of through conductive parts arranged in parallel on a dielectric block as a board mounting surface. The object of the present invention is to provide a dielectric filter whose height can be reduced by placing the block horizontally.

The present invention has a substantially rectangular parallelepiped-shaped dielectric block with a conductive film formed on its outer surface, and a plurality of through conductive parts arranged in parallel at intervals, and the input/output terminal part has a center conductor integrated with the insulator. is provided in a through hole of the through conductive portion that is open on the open end surface side of the dielectric block where no conductive film is provided, wherein the dielectric is substantially parallel to the arrangement direction of the plurality of through conductive portions. The outer surface of the block is used as a board mounting surface, the through hole of the through conductive portion in which the input/output terminal portion is provided has a non-cylindrical shape, and the input/output terminal portion is fitted into the through hole so as not to rotate. A center conductor bent into an L-shape is integrated with an insulator, and the tip of the center conductor is bent toward the board mounting surface. This solves the above problems.

(Function) In the dielectric filter of the present invention, the outer surface that is substantially parallel to the arrangement direction of the plurality of through conductive portions arranged in parallel on the dielectric block is used as the substrate mounting surface.
The height dimension can be reduced by placing the dielectric block horizontally. Furthermore, the internal shape of the through-hole conductive portion is made into a non-cylindrical shape, that is, a substantially polygonal columnar shape, a substantially elliptical columnar shape, or a columnar shape with an engagement portion for preventing rotation, so that the central conductor of the input/output terminal portion does not twist (rotate). The center conductor, which is bent substantially perpendicularly toward the board mounting surface side, can be directly connected to the board side.

(Example) Examples of the dielectric filter according to the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a substantially rectangular parallelepiped dielectric block 2A has through-conducting portions 1A and 1B formed by forming a conductive film on the inner surface of a prismatic through-hole arranged in parallel at both end positions, and through-holes at an intermediate position. A through conductive portion 1C formed by forming a conductive film on the inner surface of the round hole is provided.
Further, on the outer surface of the dielectric block (one surface and four side surfaces where the through conductive portion is present), the through conductive portions 1A, 1
A conductive film 3 connected to B and 1C is formed.

Also, the open end surface 6 of the dielectric block 2A where the open ends of the through conductive portions 1A, 1B, 1C are located.
is a portion where no conductive film is formed.

On the other hand, the input/output terminal section 5A is formed by integrating a central conductor 4A bent into an L-shape (approximately right angle) with a prismatic insulator 7, and the prismatic dielectric 7 is connected to the through conductive section 1A, By fitting into the prismatic hole opened on the open end surface side of 1B, the center conductor 4A
is attached so that the tip thereof is perpendicular to the substrate 10.

Note that a convex portion 8 is formed in the middle of the short-circuited end face (opposite the open end face) of the dielectric block 2A, and this is for adjusting the resonance frequency.

According to the above embodiment, the following effects can be obtained.

(1) As shown in Figure 2, the through conductive parts 1A, 1B, 1C
The outer surface X of the dielectric block 2A, which is parallel to the arrangement direction, can be used as a mounting surface that contacts the substrate 10 of a communication device, etc., and the dielectric block 2A is
Can be placed horizontally on 0. Therefore, the height dimension Y from the substrate can be shortened.

(2) Since the inner through holes of the conductive through parts 1A and 1B located at both ends are made into a prismatic shape, by fitting the input/output terminal part 5A having the prismatic insulator 7, it can be bent into an L-shape. Twisting (rotation) of the central conductor 4A can be prevented.

FIGS. 4 and 5 show other cross-sectional shapes of the inner through hole in the through conductive portion. FIG. 4 shows a through conductive portion 1D having a substantially elliptical columnar hole, and FIG.
A through conductive portion 1E is shown. In this case, the dielectric shape on the input/output terminal side is
D, 1E can be fitted into a substantially elliptical columnar shape or a columnar shape with an engagement protrusion for preventing rotation.

In addition, in the above embodiment, the through conductive portion 1A,
Although the internal shape of 1B is square prism, it may also be triangular, pentagonal, hexagonal, etc. In addition, this is an example of three stages in which a conductive film is provided in the through hole portion at the intermediate position to constitute the through conductive part 1C, but if no conductive film is provided, there will be two stages and the through hole will be a through hole for adjusting the degree of coupling. It can be used as a hole.

(Effects of the invention) As explained above, according to the invention, the outer surface that is substantially parallel to the arrangement direction of a plurality of through conductive parts arranged in parallel on the dielectric block is used as the board mounting surface, and the dielectric block is mounted horizontally. A dielectric filter whose height can be reduced as a stand-alone device can be obtained, and can be adapted to applications with severe height restrictions.

Furthermore, the central conductor of the input/output terminal portion can be prevented from twisting (rotating), and the central conductor bent toward the board mounting surface side can be directly connected to the board side.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the dielectric filter according to the present invention, Fig. 2 is a sectional view of the same side, Fig. 3 is a perspective view of a conventional dielectric filter, and Figs. It is a top view which shows the cross-sectional shape of the penetration conductive part in an invention. 1,1A to 1E...Through conductive part, 2,2A...
...dielectric block, 3...conductive film, 4,4A...
Center conductor, 5,5A...input/output terminal section.

Claims (1)

[Claims for Utility Model Registration] An input/output terminal section in which a plurality of through conductive parts are arranged in parallel at intervals on a substantially rectangular parallelepiped dielectric block with a conductive film formed on its outer surface, and a center conductor is integrated into the insulator. In the dielectric filter, the insulator is provided in the through hole of the through conductive portion which is open to the open end surface side of the dielectric block where the conductive film is not provided, in the arrangement direction of the plurality of through conductive portions. The substantially parallel outer surface of the dielectric block is used as a board mounting surface, the through hole of the through-conducting portion in which the input/output terminal portion is provided has a non-cylindrical shape, and the input/output terminal portion rotates into the through hole. A central conductor bent in an L-shape is integrated into an insulator that is fitted so that the conductor is not bent, and the tip of the central conductor is bent toward the board mounting surface. dielectric filter.