JPS6051001A - Dielectric filter - Google Patents

Abstract

PURPOSE:To simplify a structure, also to execute easily an adjustment, and to raise a characteristic by forming a stepped part on both ends in the direction for arranging a dielectric resonator, and placing an adjacent circuit substrate. CONSTITUTION:A stepped part 91 is formed on both ends of a filter installing base 9, and dielectric resonators 21-23 are arranged through an insulating base 10 on the line for connecting the stepped part 91. Also, when a housing 6 to which a mixer, a circulator, etc. are mounted is installed to the stepped part 91 and operated, the resonator 21 of the first stage is magnetically coupled to an input side coupling antenna 51, and the resonator 21 is magnetically coupled to the adjacent resonator 22. Furthermore, the resonator 22 is magnetically coupled to the resonator 23 of the post-stage, and the resonator 23 is magnetically coupled to an output side coupling antenna 52. Accordingly, it is possible to take out a dielectric filter only and to adjust the simple substance, and also, its fine adjustment can be executed in a state that it remains incorporated, by providing additionally an adjusting screw as necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical field of the invention The present invention relates to a dielectric filter used in radio equipment, etc.
In particular, the present invention relates to a dielectric filter that has a simple structure to be mounted in a microwave integrated circuit (hereinafter referred to as MC) and can be easily adjusted.

fb) Technical Background Radio equipment uses VHF band, U
Filters for the HF band or microwave band are used, but many of the high frequency filters utilize three-dimensional circuits such as waveguides and cavities, and miniaturization has been key. However, with the recent demand for downsizing, filters are also required to be downsized.

In particular, filters used in mobile radio devices such as in-vehicle radios or portable radios are required to be small and lightweight in terms of ease of use and installation space. A dielectric filter can be considered as such a filter, and there is a strong demand for the development of a dielectric filter that has a simple structure and is easy to open and adjust.

fcl Problems with the Prior Art Dielectric filters mounted in conventional MICs are shown in FIGS. 1, 2, and 3. That is, FIGS. 1, 2, and 3 are perspective views for explaining conventional dielectric filters, in which 1 is a case 12, which is a dielectric resonator, 3 is a substrate, 4 is a connector, and 5 is a coupled antenna. , 6 is body, 7
8 is a gold ribbon, and 8 is an adjacent circuit board.

In the dielectric filter shown in FIG. 1, dielectric resonators 2 are arranged on a substrate 3, the substrate 3 is housed in a case 1, and a coupled antenna 5 is arranged.
It has a structure in which it is connected to the connector 4 via the connector 4, and an extra case 1 and connector 4 are required. The dielectric filter shown in FIG. 2 has dielectric resonators 2 arranged on a substrate 6 equipped with a substrate 3, and adjacent circuit boards 8 attached to both ends of the substrate 3 on which the dielectric resonators 2 are arranged. , has a structure in which the coupled antenna 5 and the adjacent circuit are connected by bonding with a gold ribbon 7,
The connection using the gold ribbon 7 becomes a problem, and the dielectric filter shown in FIG. However, since the filter section is not separated, each has its own problems, such as difficulty in adjustment.

(dl Purpose of the Invention In view of the above-mentioned conventional problems, an object of the present invention is to provide a dielectric filter having a simple structure and easy adjustment by arranging dielectric resonators in a stepped mounting base. It is something to do.

(e) °Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a mounting base having stepped portions formed at both ends in the direction in which dielectric resonators are arranged, and circuit boards adjacent to the stepped portions, respectively. This is achieved by having a configuration in which the equipped body is attached.

Embodiments of the Invention Hereinafter, embodiments of the dielectric filter according to the present invention will be described in detail with reference to the drawings.

FIG. 4 is a plan view of an embodiment of the dielectric filter according to the present invention, and FIG. 4 is a cross-sectional view of main parts, with the same reference numerals used for the same parts as before. and
9 is a filter mounting base, 10 is a low dielectric constant insulation base, 11 is a case, 21.22 and 23 are dielectric resonators, 51
is an input side coupling antenna, 52 is an output side coupling antenna, 9
1 is a stepped portion.

A stepped portion 91 is formed at both ends of the filter mount 9 made of metal such as brass, and a plurality of (
The dielectric resonators 21-23 (three in the drawing) are mounted on the insulating stand 10.
If the filter body 6 on which a mixer, circulator, etc. are mounted is attached to the stepped portions 91 at both ends of the filter mount 9 arranged through the filter mount 9 and operated, an input connected to the circuit will be generated. First-stage dielectric resonator 21 in side-coupled antenna 51
are magnetically coupled to each other, and the dielectric resonator 21 is magnetically coupled to an adjacent dielectric resonator 22. Furthermore, dielectric resonator 2
2 is magnetically coupled to a subsequent dielectric resonator 23, and the dielectric resonator 23 is magnetically coupled to an output side coupling antenna 52 connected to an output side circuit. Incidentally, it is possible to take out only the dielectric filter and adjust it as a single unit using a suitable jig, and if necessary, it is also possible to incorporate it and then attach an adjustment screw (not shown) to the filter mounting base 9 for fine adjustment. .

Although this embodiment has been described with three dielectric resonators arranged, the number of dielectric resonators is not limited to three, and may be one or more.

Tgl Effects of the Invention As is clear from the above explanation, the dielectric filter according to the present invention has a simpler structure and easier adjustment than conventional dielectric filters, which greatly contributes to improved characteristics. It is.

[Brief explanation of the drawing]

1, 2, and 3 are perspective views for explaining a conventional dielectric filter, and FIG. 4 is a perspective view for explaining an embodiment of a dielectric filter according to the present invention. is a plan view, and (b) is a sectional view of main parts. In the figure, 1 and 11 are cases, 2.2L22 and 23 are dielectric resonators, 3 is a board, 4 is a connector, 5 is a coupled antenna, and 6 is a 7 is a gold ribbon, 8 is an adjacent circuit board, 9 is a filter mounting base, 10 is an insulating stand, 51 is an input side coupling antenna, 52 is an output side coupling antenna, and 91 is a stepped portion.

Claims (1)

[Claims] A dielectric material characterized in that the mounting base has stepped portions formed at both ends in the direction in which the dielectric resonators are arranged, and a mounting body having an adjacent circuit board is attached to each of the stepped portions. filter.