JPS63161702A - Dielectric filter - Google Patents

Abstract

PURPOSE:To miniaturize a filter by arranging plural resonance rods in a conductive case at a prescribed interval and clipping a plate dielectric between the upper/lower part of the resonance array and the case. CONSTITUTION:The flat dielectric bodies 5, 6 are clipped respectively between the upper/lower part of the array of the resonance rod 2 and the case 1. Moreover, electrodes 5a, 6a are formed respectively to a face of the case 1 of the dielectric bodies 5, 6 and they are connected electrically to the case 1. Thus, the length of each resonance rod 2 is decreased by the operation of the dielectric bodies 5, 6 is attained, that is, the filter is miniaturized and number of components is decreased, the assembly is simplified and the productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dielectric filter that is made smaller by using a dielectric material.

[Conventional technology]

FIG. 4 is a partially cutaway perspective view of an example of a conventional dielectric filter.
It is disclosed in Japanese Patent No. 37241.

That is, this filter has a plurality of resonant rods 2 arranged at predetermined intervals in a comb shape or an interdigital shape in a conductive, for example, metal case 1, and a dielectric material 3 is placed around each resonant rod 2.
The electrodes 3 are individually covered with electrodes 3 and formed on the upper and lower end surfaces thereof.
A is electrically connected to case l. Moreover, a gap 4 is provided between each dielectric body 3, and this configuration allows the length of each resonant rod 2 to be shortened, and the overall size of the filter to be reduced.

[Problem that the invention seeks to solve]

However, in the above filter, each resonant rod 2
Since it is necessary to individually cover the circumference with the dielectric material 3, there are problems in that the number of parts is large, and assembly is time-consuming and productivity is poor.

Therefore, an object of the present invention is to provide a dielectric filter that is further improved in these points.

[Means for solving problems]

The dielectric filter of the present invention is characterized in that a plurality of resonant rods are arranged at predetermined intervals in a conductive case, and a plate-shaped dielectric is sandwiched between the upper and lower rows of the resonant rods and between the case. .

[Effect]

By using the dielectric material sandwiched between the resonant rod array and the case, the filter can be made smaller in almost the same way as in the conventional case. Moreover, in this case, only two plate-shaped dielectrics are required, which reduces the number of parts and facilitates assembly, improving productivity.

〔Example〕

FIG. 1 is a sectional view showing a dielectric filter according to an embodiment of the present invention. The same reference numerals are given to the same or corresponding parts as in FIG. 4, and the differences from the conventional example will be mainly explained below.

In this embodiment, plate-shaped dielectrics 5 and 6 are sandwiched between the upper and lower rows of the resonant rods 2 as described above and the case 1, respectively. Furthermore, electrodes 5a and 6a are formed (for example, metallized) on the surface of each dielectric 5.6 on the case 1 side, and are electrically connected to the case 1.

Due to the effect of this dielectric 5.6, it is possible to shorten the length of each resonant rod 2, that is, to downsize the filter, as in the conventional case. Moreover, in this case, only two flat dielectrics are required, reducing the number of parts and
It is easier to assemble than using a conventional block structure, and productivity is improved.

FIG. 2 is a sectional view showing a dielectric filter according to another embodiment of the invention. In this embodiment, recesses 5b and 6b each having a shape corresponding to the resonant rod 2 are provided at a position corresponding to each resonant rod 2 on the surface of each dielectric 5.6 on the resonant rod 2 side. In this way, the area covered by each resonant rod 2 by the dielectric 5.6 becomes larger, so the dielectric 5.6
The effect of can be further strengthened.

FIG. 3 is a sectional view showing a dielectric filter according to still another embodiment of the invention. In the embodiments shown in FIGS. 1 and 2, if the surface of the dielectric 5.6 on the side of case 1 is very flat and the entire surface is in uniform contact with case 1, the boundary is determined by this. Although the electrodes 5a and 6a do not necessarily need to be provided, as in the above embodiment, the electrodes 5a and 6a are not necessarily provided.
It is more practical to provide the electrodes 5a and 6a.
If a and 6a are provided, the boundary is determined by them, so for example, in case 1 of dielectric material 5.6 as in this example,
Even if the surface of the example is uneven and the dielectric 5.6 comes into partial contact with the case 1, there is no particular problem.

It goes without saying that the number, cross-sectional shape, etc. of the resonance rods 2 are not necessarily limited to those shown in the illustrated example. Further, although an input/output rod serving as a filter is not shown, it may be provided separately from the resonance rod 2, or a part of several resonance rods 2 may be used therefor.

〔Effect of the invention〕

As described above, according to the dielectric filter of the present invention, since only two plate-shaped dielectrics are required, the number of parts is reduced, assembly is easy, and productivity is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a dielectric filter according to an embodiment of the present invention. FIG. 2 is a sectional view showing a dielectric filter according to another embodiment of the invention. FIG. 3 is a sectional view showing a dielectric filter according to still another embodiment of the invention. FIG. 4 is a partially cutaway perspective view of an example of a conventional dielectric filter. DESCRIPTION OF SYMBOLS 1... Case, 2... Resonance bar, 5, 6... Dielectric material, 5a, 6a... Electrode, 5b, 6b... Recess.

Claims (1)

[Claims] (1) A dielectric filter characterized in that a plurality of resonant rods are arranged at predetermined intervals in a conductive case, and a plate-shaped dielectric material is sandwiched between the upper and lower rows of the resonant rods and between the case.