CN219106480U - Loading cavity filter - Google Patents

Abstract

The utility model discloses a loading cavity filter, which comprises a shell and a cover plate, wherein the inner wall of the shell is connected with a ceramic medium, a resonant circuit is etched on the surface of the ceramic medium, the input end and the output end of the ceramic medium are both connected with pins, the pins penetrate through the shell and are connected with a connector, and the connector is detachably connected with the shell. The filter is formed by connecting a ceramic medium with a cavity, reduces the space in the length and width directions, etches a resonance image on the ceramic medium by utilizing a laser etching method, does not need to independently process devices such as a resonance rod, a tuning screw and the like, reduces machining cost, saves the workload of assembly and debugging, improves the reliability of products, and reduces the cost of mass production of the filter.

Description

Loading cavity filter

Technical Field

The utility model relates to the technical field of filters, in particular to a loading cavity filter.

Background

The miniaturized loading cavity filter is formed by combining ceramics and a cavity through loading in a certain form.

The conventional cavity band-pass filter is generally realized by the following steps: a filter formed of a housing, a resonant rod, a tuning screw, etc. having an input port and an output port; known in the industry as cavity band pass filters.

The common cavity filter adopts a microwave filter with a resonant cavity structure, a resonant rod and a tuning screw are connected in series to be equivalent to form an inductance capacitor, a resonant cavity is formed to realize a frequency selection function, and a plurality of resonant cavities are connected in parallel to realize a filtering function; the existing cavity filter can be connected into a cavity band-pass filter only by a resonant rod, a tuning screw and the like; the resonant rod, the tuning screw and the like lead to the large size of the cavity band-pass filter in the length, width and thickness directions, and the miniaturization requirement of the cavity band-pass filter cannot be met.

All devices needed by the introduced cavity filter are machined, so that the requirements on machining precision are high, the size is more, and the cost is high. The production period is long and the efficiency is low.

Disclosure of Invention

The utility model aims to solve the defects in the prior art, and provides a loading cavity filter.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a loading cavity filter, includes casing and apron, the inner wall of casing is connected with ceramic dielectric, and ceramic dielectric's surface etching has resonant circuit, and ceramic dielectric's input and output all are connected with the pin, and the pin runs through the casing and is connected with the connector, and the connector can dismantle with the casing and be connected.

Preferably, the connection part of the pin and the shell is sleeved with an insulating sleeve, and the insulating sleeve is connected with the shell.

Preferably, the connector is provided with a mounting hole, and a connecting piece is arranged in the mounting hole and is in threaded connection with the shell.

Preferably, the ceramic medium is welded to the housing.

Preferably, the housing and the cover plate are sealingly connected by welding.

Compared with the prior art, the utility model has the beneficial effects that: the filter is formed by connecting a ceramic medium with a cavity, reduces the space in the length and width directions, etches a resonance image on the ceramic medium by utilizing a laser etching method, does not need to independently process devices such as a resonance rod, a tuning screw and the like, reduces machining cost, saves the workload of assembly and debugging, improves the reliability of products, and reduces the cost of mass production of the filter.

Drawings

In order to more particularly and intuitively illustrate an embodiment of the present utility model or a technical solution in the prior art, a brief description of the drawings is provided below, which are required to be used in the description of the embodiment or the prior art.

FIG. 1 is a schematic diagram of a structure according to the present utility model;

FIG. 2 is a bottom view of FIG. 1;

FIG. 3 is a circuit diagram of a fourth order cavity band pass filter;

FIG. 4 is a graph of a fourth order cavity band pass filter simulation;

fig. 5 is a graph of a fourth-order cavity band-pass filter real test.

In the figure: the connector comprises a connecting seat 1, a ceramic medium 2, a shell 3, a connector 4, pins 5, a connecting piece 6 and an insulating sleeve 7.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1-5, a loading cavity filter comprises a shell 3 and a cover plate, wherein the inner wall of the shell 3 is connected with a ceramic medium 2, a resonant circuit is etched on the surface of the ceramic medium 2, the input end and the output end of the ceramic medium 2 are both connected with pins 5, the pins 5 penetrate through the shell 3 and are connected with a connector 4, and the connector 4 is detachably connected with the shell 3.

The etched ceramic medium 2 is directly welded with the shell 3, pins 5 are welded on input and output transmission lines of the ceramic medium 2 respectively, and a connector 4 and a cover plate are arranged to form a cavity filter.

In this embodiment, pin 5 has cup jointed insulating cover 7 with casing 3 junction, and insulating cover 7 links to each other with casing 3, is equipped with the mounting hole on the connector 4, is equipped with connecting piece 6 in the mounting hole, and connecting piece 6 and casing 3 threaded connection, ceramic medium 2 and casing 3 welded connection, casing 3 and apron pass through welded seal connection.

FIG. 3 is a circuit diagram of a 4-stage cavity bandpass filter, wherein R1, R2, R3, R4 are four resonant cells of the filter; c1, C2, C3, C4 and C5 are coupling units of the filter, and P1 and P2 are input and output ports of the 4-order cavity band-pass filter.

Fig. 4 and 5 are simulation curves and physical test curves of a fourth-order cavity band-pass filter, and it can be seen from the figures that the theory and implementation method of the miniaturized loading cavity band-pass filter of the present utility model are feasible, and the size of the planar space is greatly reduced by the loading technology.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (5)

1. The utility model provides a loading cavity filter, includes casing (3) and apron, its characterized in that, the inner wall of casing (3) is connected with ceramic dielectric (2), and the surface etching of ceramic dielectric (2) has resonant circuit, and the input and the output of ceramic dielectric (2) all are connected with pin (5), and pin (5) run through casing (3) and are connected with connector (4), and connector (4) can dismantle with casing (3) and be connected.

2. A loading cavity filter according to claim 1, wherein an insulating sleeve (7) is sleeved at the connection between the pin (5) and the housing (3), and the insulating sleeve (7) is connected with the housing (3).

3. A loading cavity filter according to claim 2, wherein the connector (4) is provided with a mounting hole, and a connecting piece (6) is arranged in the mounting hole, and the connecting piece (6) is in threaded connection with the housing (3).

4. A loading cavity filter according to claim 3, characterized in that the ceramic medium (2) is welded to the housing (3).

5. A loading cavity filter according to claim 4, wherein the housing (3) and cover plate are sealingly connected by welding.

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