JPH0537521Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is based on the structure of a dielectric filter device in which a plurality of coaxial resonant units are configured in a dielectric block, and in particular on a dielectric filter device with an improved input/output pin structure. The present invention relates to a body filter device.

[Prior Art] An example of a conventional dielectric filter device is shown in FIG. The dielectric filter 1 is constructed such that a plurality of coaxial resonant units are coupled to each other in a dielectric block 2. A plurality of through holes are formed in this dielectric block 2 for inserting input/output pins 3 and 4 from the voltage open end surface side. Each input/output pin 3, 4 has a central conductor 5, 6 made of a conductive material.
and outer cylinders 7, 8 integrally formed of synthetic resin around the center conductors 5, 6. The outer cylinders 7 and 8 are press-fitted and fixed into a through hole formed in the dielectric block 2.

[Problems to be solved by the invention] The dielectric filter device 1 shown in FIG. 2 requires independent input/output pins 3, 4, so each input/output pin 3, 4 must be inserted into a through hole, respectively. Must be. Therefore, inserting and fixing the input/output pins 3 and 4 is complicated.

Moreover, in the dielectric filter device, the characteristics change greatly due to a slight positional shift between the input/output pins 3 and 4. However, when inserting the input/output pins 3 and 4 or when handling the dielectric filter device 1, the input/output pins 3 and 4 may not be inserted into the correct position within the through hole, or may rotate slightly within the through hole and may not be correctly positioned. It may move out of position. Therefore, it has been difficult to obtain a dielectric filter device with uniform filter characteristics.

Therefore, the purpose of this invention is to provide a dielectric filter device with uniform characteristics that can simplify the installation work of input/output pins, and can insert and hold the input/output pins in the correct position. There is a particular thing.

[Means for Solving the Problems] The dielectric filter device of this invention includes a dielectric block having a plurality of through holes, an inner conductor formed on the inner surface of the through hole of the dielectric block, and the dielectric filter device. The dielectric block has an outer conductor formed on the outer surface of the block, and a plurality of coaxial resonant units are mutually coupled within the dielectric block. A plurality of input/output pins having a center conductor made of a conductive material and an outer cylinder made of synthetic resin integrally formed around the center conductor are inserted and held in the through holes of the dielectric block. There is. The outer cylinders of the plurality of input/output pins are connected to each other by a connecting portion, and are integrally formed with the connecting portion from synthetic resin.

[Operations and Effects of the Invention] In this invention, the outer cylinders of the plurality of input/output pins are formed integrally with each other from synthetic resin. Therefore, multiple input/output pins can be handled as one unit, and multiple input/output pins can be inserted into the through-hole of the dielectric block at the same time, thus greatly reducing the insertion work. The dielectric filter device can be simplified and inexpensive. Moreover, since the plurality of input/output pins are mutually integrated with synthetic resin, they are prevented from rotating independently when inserted into the through hole of each input/output pin or when handled. Therefore, the input/output pin can be inserted and held in the correct direction in the through hole of the dielectric block, and a dielectric filter device with uniform characteristics can be realized.

[Description of Embodiment] FIG. 1 is an exploded perspective view of an embodiment of this invention. The dielectric block 12 has a plurality of through holes 1.
3 and 14 are formed, and a plurality of coaxial resonant units are configured to be coupled to each other within the dielectric block 12. Hole 1 in Figure 1
5 is formed for coupling a plurality of coaxial resonant units. Inner conductors 16 and 17 are formed on the inner peripheral surfaces of the through holes 13 and 14, and an outer conductor 18 is formed on the outer surface of the dielectric block 12.

Input/output pins 21, 22 shown on the left side of FIG. 1 are inserted into the through holes 13, 14. By the way, the input/output pins 21 and 22 are provided with central conductors 21a and 22 made of metal as a conductive material, respectively.
a, and outer cylinders 21b and 22b integrally formed of synthetic resin around the center conductors 21a and 22a. Up to this point, it is similar to the input/output pins of a conventional dielectric filter device. A feature of this invention is that the outer cylinders 21b and 22b are integrated with synthetic resin. That is, as shown in FIG. 3, the outer cylinder 2 is
1 and the outer cylinder 22 are integrated. In this embodiment, the connecting plate 23 and the outer cylinders 21, 22 are integrally formed.

Therefore, since the plurality of input/output pins 21, 22 can be handled as one unit, the outer cylinders 21b, 22b can be simultaneously inserted and held in the through holes 13, 14 along the arrows in FIG. Moreover, since the outer cylinders 21b and 22b are integrated by the plate 23, they cannot rotate independently. Therefore, the input/output pins 21 and 22 do not rotate within the through holes 13 and 14 during insertion or when handling the dielectric filter device after insertion, making it possible to realize a dielectric filter with stable characteristics. can.

The input/output pins 21 and 22 mentioned above are connected to the through holes 13,
14 is shown in FIG. In this embodiment, the outer conductor 18 and the inner conductors 16, 17 are short-circuited by a short-circuit conductor 18a formed on one end surface of the dielectric block 12, and the inner conductors 16, 17 and the outer conductor 18 are short-circuited. A pair of resonant units is constituted by the dielectric block portion. The resonant units are coupled to each other by holes 15. Furthermore, an external circuit (not shown) and each of the above-mentioned resonance units are connected to the outer cylinders 21b, 2.
A 1/4 wavelength distribution constant type filter is constructed by electrostatically coupling each input/output coupling capacitor constituted by a capacitance based on 2b.

By the way, as shown in FIG. 3, the input/output pins 21 and 22 had large diameter portions 21c and 22c formed on the plate 23 side via a stepped portion of different diameter. However, as shown in FIG. 5, the large diameter portions 21c and 22c may not be provided. However, in this case, the outer cylinder 21b,
22b will be inserted.

In addition, as shown in FIG. 6, the dielectric block 1
The outer cylinders 21b and 22b of the input/output pins 21 and 22 may be connected and integrated using a synthetic resin connecting member 33 that does not match the outer diameter of the voltage open end surface of the input/output pins 21 and 22.

Similarly, as shown in FIG. 7, a synthetic resin connecting member 43 having some degree of flexibility is used to
The large diameter portions 21c and 22c of 1b and 22b may be interconnected and integrated.

In any of the examples shown in Figures 3 and 5 to 7, the connecting plates 23, 33 and connecting material 43 only need to be formed integrally with the outer tubes 21b, 22b, and therefore may be molded simultaneously with the outer tubes by previously molding synthetic resin as a single unit, or previously molded outer tubes 21b, 22b may be integrated with the above-mentioned connecting plates or connecting materials using an adhesive or the like.

By the way, in the embodiment described above, the center conductor 21
a, 21b have a shape extending linearly outward from the voltage open end surface, but as shown in FIG. well or the ninth
As shown in the figure, the tip may be further bent back in a direction perpendicular to the voltage open end surface, thereby improving the ease of mounting onto a printed circuit board or the like. Further, in the conventional example, when the center conductor is bent as shown in FIG. 9, rotation occurs and the characteristics become unstable, but in the example shown in FIG. 9, such deterioration of characteristics does not occur.

Further, the cross-sectional shape of each center conductor is not limited to a circular shape, but a polygonal cross-sectional shape can also be used.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of this invention.
2 is a perspective view of a conventional dielectric filter device, FIG. 3 is a front view showing input/output pins used in the embodiment of FIG. 1, FIG. 4 is a longitudinal sectional view of the embodiment of FIG. 1, and FIG. The figure is a front view showing another example of input/output pins,
FIG. 6 is a perspective view showing still another example of the input/output pin, FIG. 7 is a perspective view showing still another example of the input/output pin, and FIGS. 8 and 9 are, respectively,
FIG. 7 is a perspective view showing other examples of the shape of the center conductor. In the figure, 12 is a dielectric block, 13, 1
4 is a through hole, 16 and 17 are inner conductors, 18 is an outer conductor, 21 and 22 are input/output pins, 21a and 21b are center conductors, 21b and 22b are outer cylinders, and 23 is a synthetic resin connecting plate.

Claims (1)

[Claims for Utility Model Registration] A dielectric block having a plurality of through holes, an inner conductor formed on the inner surface of the through holes of the dielectric block, and an outer conductor formed on the outer surface of the dielectric block, A plurality of coaxial resonant units are coupled within the dielectric block, and includes a central conductor made of a conductive material and an outer cylinder made of synthetic resin integrally formed around the central conductor, In a dielectric filter device further comprising a plurality of input/output pins inserted into the through holes at outer cylinder portions, the outer cylinders of the plurality of input/output pins are connected to each other by a connecting portion, and the outer cylinders of the plurality of input/output pins are connected to each other by a connecting portion. With,
A dielectric filter device characterized in that they are integrally formed of synthetic resin.