CN109244612B - Miniaturized comb-shaped ceramic tube medium cavity filter - Google Patents

Abstract

The invention discloses a novel miniaturized comb-shaped ceramic tube medium cavity filter, which belongs to the technical field of microwave components and parts and comprises a metal tube shell cavity, a metal tuning needle/column, a ceramic medium loading tube and a connector, wherein cavity through holes are formed in two opposite side walls of the metal tube shell cavity, the ceramic medium loading tube stretches into the cavity through hole on one side of the metal tube shell cavity, and the metal tuning needle/column stretches into the cavity through hole on the other side of the metal tube shell cavity; the comb-shaped ceramic tube medium cavity filter is miniaturized, has no fastening fittings, is easy to design, process and manufacture, is suitable for development and production of the filter in harsh environments with mechanical vibration, wide-temperature working and the like, and has important application value in modern electronic communication systems.

Description

A miniaturized comb-shaped ceramic tube dielectric cavity filter

Technical field

The invention relates to the technical field of microwave components, and in particular to a new type of miniaturized comb-shaped ceramic tube dielectric cavity filter.

Background technique

Microwave filters are indispensable key components in electronic countermeasures, radar, communications and other systems, and comb cavity filters are a type of microwave filters with compact structure, good electromagnetic shielding, low insertion loss, and rectangularity. High performance and good out-of-band suppression. The typical structure of the current comb cavity filter is shown in Figure 1. It is mainly composed of a metal cavity 1, a metal tuning screw 2, a metal tuning nut 3, a microwave connector 4, etc. The metal cavity implements the resonator unit of the filter. Coupled with the unit, the metal tuning screw enables accurate tuning of the filter.

The current conventional comb cavity filter has the following disadvantages.

First, in order to obtain good microwave performance, the cavity filter resonant unit is wavelength-dependent and loaded with air media, resulting in a large cavity filter. For example, a conventional comb cavity filter with a center frequency of 4.5GHz is long × The width × height dimensions are 50mm × 25mm × 15mm, which is not conducive to the miniaturization of modern electronic equipment and systems.

Second, metal screws are used for tuning and metal nuts for locking. The volume occupied by the metal nuts has nothing to do with the microwave performance of the product, which is not conducive to the miniaturization of the cavity filter.

Contents of the invention

The purpose of the present invention is to provide a new type of miniaturized comb-shaped ceramic tube dielectric cavity filter to solve the above problems.

In order to achieve the above object, the technical solution adopted by the present invention is as follows: a new type of miniaturized comb-shaped ceramic tube dielectric cavity filter, including a metal tube shell cavity, a metal tuning needle/column, a ceramic dielectric loading tube and a connector , wherein the opposite side walls of the metal tube shell cavity are provided with cavity through holes, and the ceramic medium loading tube extends into the cavity through hole on one side of the metal tube shell cavity, and the metal tube shell cavity The tuning pin/post extends into the cavity through hole on the other side of the metal tube shell cavity.

The invention consists of four parts: a metal tube shell cavity, a metal tuning needle/column, a ceramic medium loading tube and a connector, which work together. The ceramic tube is used for medium loading and tuning to increase the Q value of the filling material and achieve low-loss design; the ceramic tube is used The medium loading realizes the compression of the physical size of the 1/4 wavelength resonant unit of the filter and realizes miniaturization design; the length of the ceramic tube inserted into the cavity hole is used to realize the debugging design of the cavity filter, which generates microwave resonance and realizes microwave signal filtering. The working frequency band of the miniaturized comb-shaped ceramic tube dielectric cavity filter of the present invention covers 100MHz to 20GHz, and can replace the traditional comb-shaped cavity filter in this frequency band.

As a preferred technical solution: the ceramic medium loading tube is bonded to the cavity through hole.

That is, the adhesive process is preferably used to fasten and assemble the ceramic tube of the miniaturized cavity filter.

As a preferred technical solution: the metal tuning pin/post is welded to the cavity through hole.

That is, the soldering process is preferably used to realize the miniaturized cavity filter tuning pin/column assembly design.

Compared with the existing technology, the advantage of the present invention is that the present invention miniaturizes the comb-shaped ceramic tube dielectric cavity filter (for example, a comb-shaped cavity filter with a center frequency of 4.5GHz has length × width × height dimensions of 25mm × 9.5mm × 4mm), no fastening accessories, filter dielectric loading and tuning, easy to design, process and manufacture, suitable for the development and production of filters in harsh environments with mechanical vibration, wide temperature operation, etc., in modern electronic communications It has important application value in the system.

Description of drawings

Figure 1 is a schematic structural diagram of a comb cavity filter in the prior art.

Figure 2 is a schematic diagram of the exploded structure of the embodiment of the present invention.

Figures 3 and 4 are schematic structural diagrams of the embodiment of the present invention after assembly.

Figure 5 is a schematic diagram of the connection between the metal tuning pin/post and the metal tube cavity in Figure 3.

Figure 6 is a schematic diagram of the connection between the ceramic medium loading tube and the metal tube shell cavity in Figure 4.

Figure 7 is a schematic structural diagram of the filter debugging according to the embodiment of the present invention.

In the picture: 1. Metal cavity; 2. Metal tuning screw; 3. Metal tuning nut; 4. Microwave connector; 5. Metal shell cavity; 6. Metal tuning needle/column; 7. Ceramic dielectric loading tube; 8 , solder layer; 9. adhesive layer.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Example:

Referring to Figures 2, 3, and 4, a new type of miniaturized comb-shaped ceramic tube dielectric cavity filter includes a metal tube shell cavity 5, a metal tuning needle/column 6, a ceramic dielectric loading tube 7 and a microwave connector 4, where , The opposite side walls of the metal tube shell cavity 5 are provided with cavity through holes, and the ceramic medium loading tube 7 extends into the cavity through hole on one side of the metal tube shell cavity 5. The metal tuning needle/post 6 extends into the cavity through hole on the other side of the metal tube housing cavity 5; the metal tube housing cavity 5 includes an upper cover, a lower bottom plate and a middle cavity.

Among them, the ceramic medium loading tube 7 is bonded to the cavity through hole, that is, the adhesive process is used to realize the fastening assembly of the ceramic tube of the miniaturized cavity filter. As shown in Figure 6, the ceramic medium loading tube 7 and the metal Between the cavity through holes of the tube shell cavity 5 is an adhesive layer 9 .

The metal tuning pin/post 6 is welded to the cavity through hole, that is, the soldering process is used to realize the miniaturized cavity filter tuning pin/post assembly design. As shown in Figure 5, the metal tuning pin/post 6 There is a solder layer 8 between it and the cavity through hole of the metal tube cavity 5 .

By adjusting the length of the ceramic tube entering the cavity hole, as shown in Figure 7, the cavity filter debugging is achieved.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (3)

1. A miniaturized comb-shaped ceramic tube dielectric cavity filter, characterized in that: it includes a metal tube shell cavity, a metal tuning needle/column, a ceramic dielectric loading tube, a resonant unit and a connector, wherein the metal tube The opposite side walls of the shell cavity are provided with cavity through holes, and the ceramic medium loading tube extends into the resonance unit through the cavity through hole on one side of the metal tube shell cavity, and the metal tuning The needle/column extends into the resonance unit through the cavity through hole on the other side of the metal tube shell cavity. 2. A miniaturized comb-shaped ceramic tube dielectric cavity filter according to claim 1, characterized in that: the ceramic dielectric loading tube is bonded to the cavity through hole. 3. A miniaturized comb-shaped ceramic tube dielectric cavity filter according to claim 1, characterized in that the metal tuning pin/column is welded to the cavity through-hole.