CN101546857A - A medium resonator and its assembling method, medium filter - Google Patents

Abstract

Embodiments of the present invention provide a dielectric resonator, an assembly method thereof, and a dielectric filter. The dielectric resonator includes a dielectric resonator column and a metal cavity, the dielectric resonator column is located in the metal cavity, and the bottom surface of the dielectric resonator column is in contact with the bottom surface of the metal cavity; the dielectric resonator also includes: A cover plate and a conductive elastic body; the cover plate is located on the upper surface of the metal cavity for sealing the metal cavity; the conductive elastic body is located between the cover plate and the dielectric resonance column, and is used for sealing the metal cavity; To make the cover plate contact with the medium in the dielectric resonant column. The dielectric filter in the embodiment of the present invention relies on the elastic force of the conductive elastic body after being compressed to ensure good contact between the dielectric resonant column and the cover plate, and to ensure uninterrupted transmission of current. Due to the sealed contact, current leakage is effectively prevented, thereby improving the filtering performance of the dielectric resonator and reducing the volume of the entire dielectric resonator.

Description

Dielectric resonator, assembly method thereof, and dielectric filter

technical field

The invention relates to the technical field of network communication, in particular to a dielectric resonator, an assembly method thereof, and a dielectric filter.

Background technique

When propagating in a material with a high dielectric constant, the wavelength of the electromagnetic wave can be shortened, so the use of a dielectric filter can reduce the size of the filter. Filters are very important components in base station products, so dielectric filters are of great significance to the miniaturization of base station products.

See Figure 1, which is a schematic diagram of a TM (transverse magnetic, transverse magnetic) mode dielectric filter, which is mainly composed of a dielectric resonant column and a metal cavity.

According to the principle of electromagnetism, when the resonator is working normally, there is current distribution at the connection between the upper and lower end surfaces of the dielectric resonant column 101 and the metal cavity 102 . If the upper and lower ends of the dielectric resonant column 101 are in poor contact with the metal cavity 102 , on the one hand, it will cause current leakage; Therefore, it is very important for the dielectric of the resonator in the TM mode dielectric filter to be in good contact with the upper and lower surfaces of the metal cavity 102 , otherwise, the current loss will increase, thereby affecting the performance of the filter.

See Figure 2 for an existing dielectric filter. Wherein, the large cover plate 203 is located on the upper surface of the dielectric resonance column, and is used to seal the upper surface of the medium and the metal cavity. The large cover plate 203 has an elastic deformation area 202 in contact with the upper surface of the dielectric resonance column. When expanding or contracting, the elastically deformable regions deform to maintain sealing contact. Moreover, a small cover plate 201 is also provided on the large cover plate 203 for sealing the dielectric filter as a whole.

However, the elastic deformation region 202 is only in linear contact with the upper surface of the dielectric resonant column. The upper surface of the entire dielectric resonant column is not completely in contact with the cover plate, which increases the contact resistance, thereby increasing the loss and affecting the performance index of the filter. Moreover, the added small cover plate 201 increases the volume of the entire dielectric filter, which not only complicates the structure but also occupies a large space, resulting in material waste.

Contents of the invention

Embodiments of the present invention provide a dielectric resonator, an assembly method thereof, and a dielectric filter, which can make good contact between the dielectric resonator column and the surface of the metal cavity, reduce loss, and improve the performance index of the filter.

An embodiment of the present invention provides a dielectric resonator, including a dielectric resonator column and a metal cavity, the dielectric resonator column is located in the metal cavity, the bottom surface of the dielectric resonator column is in contact with the bottom surface of the metal cavity, and further includes : a cover plate and a conductive elastomer, the cover plate is located on the upper surface of the metal cavity for sealing the metal cavity; the conductive elastomer is located between the cover plate and the dielectric resonance column, It is used to make the cover plate contact with the medium in the medium resonant column.

An embodiment of the present invention also provides a dielectric filter, which is formed by connecting one or more dielectric resonators.

In addition, an embodiment of the present invention provides a method for assembling a dielectric resonator, including:

Fix the lower surface of the dielectric resonance column with the metal cavity;

The upper surface of the dielectric resonance column is connected with the cover plate through a conductive elastic body.

The embodiments of the present invention rely on the resilience of the conductive elastic body after being compressed to ensure good contact between the dielectric resonant column and the cover plate, and to ensure uninterrupted transmission of current. Due to the sealed contact, current leakage is effectively prevented, thereby improving the filtering performance of the dielectric resonator and reducing the volume of the entire dielectric resonator.

Description of drawings

Fig. 1 is the schematic diagram of prior art TM mode dielectric filter;

Fig. 2 is a schematic diagram of a dielectric resonator in the prior art;

Fig. 3 is a structural schematic diagram of the first embodiment of the dielectric resonator of the present invention;

Fig. 4 is a schematic structural view of the conductive elastomer of the present invention;

Fig. 5 is another schematic structural view of the conductive elastomer of the present invention;

Fig. 6 is another schematic structural view of the conductive elastomer of the present invention;

Fig. 7 is a schematic structural diagram of the second embodiment of the dielectric resonator of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

An embodiment of the present invention provides a dielectric resonator, including:

A dielectric resonance column and a metal cavity, the dielectric resonance column is located in the metal cavity, and the bottom surface of the dielectric resonance column is in contact with the bottom surface of the metal cavity; it also includes: a cover plate and a conductive elastic body;

The cover plate is located on the upper surface of the metal cavity and is used to seal the metal cavity;

The conductive elastic body is located between the cover plate and the dielectric resonant column, and is used to make the cover plate contact with the medium in the dielectric resonant column.

Wherein, the bottom surface of the dielectric resonance column is welded with the bottom surface of the metal cavity. The resilience of the conductive elastomer after compression can ensure the close contact between the dielectric resonant column and the cover plate, and ensure the uninterrupted transmission of current, thereby improving the filtering performance. In addition, the dielectric resonator has a simple structure and a small volume.

The following describes the embodiment of the dielectric resonator of the present invention in detail, referring to FIG. 3 , which is a schematic structural diagram of the first embodiment of the dielectric resonator of the present invention.

The dielectric resonator includes a dielectric resonator column 302 and a metal cavity 304 .

The dielectric resonance column 302 is located in the housing, and the bottom surface of the dielectric resonance column 302 is in contact with the bottom surface of the housing.

The dielectric resonator provided by the embodiment of the present invention further includes: a cover plate 303 and a conductive elastic body 301 .

The cover plate 303 is located on the upper surface of the metal cavity 304 , that is, the top end, and is used to seal the metal cavity 304 .

The conductive elastic body 301 is located between the cover plate 303 and the dielectric resonant column 302 , and is used to seal the medium between the cover plate 303 and the dielectric resonant column 302 to ensure current transmission.

The conductive elastic body 301 utilizes the elastic force after being compressed to ensure close contact between the cover plate 303 and the medium, thereby ensuring good transmission of current.

After the entire dielectric resonator is assembled, the conductive elastic body 301 is under the pressure of the cover plate 303 and the medium, and is always in a state of elastic deformation.

The conductive elastic body 301 may be a thin metal sheet with good electrical conductivity.

The conductive elastic body provided by the embodiment of the present invention is preferably a silver-plated reed, and of course it can also be other metals with good conductivity.

The reed can preferably be made of beryllium copper material.

The reed made of beryllium copper and the cover plate can be welded together.

The welding connection method is more conducive to current transmission, thereby reducing current loss and improving the filtering performance of the dielectric resonator.

It should be noted that the conductive elastomer can also be fixed to the cover plate in other ways, as long as it facilitates close contact and facilitates current transmission.

The embodiments of the present invention rely on the dielectric resonator to rely on the elastic force of the conductive elastic body after being pressed to ensure the close contact between the dielectric resonant column and the cover plate, so as to ensure the uninterrupted transmission of current. Due to the sealed contact, the current leakage is effectively prevented, thereby improving the performance of the dielectric resonator. Also, the volume of the entire dielectric resonator is reduced.

Referring to Fig. 4, this figure is a schematic diagram of the structure of the conductive elastomer in the embodiment of the present invention.

It includes a central hole a, an annular bottom surface b and an outer edge c.

Wherein, the central hole a is used for passing the tuning screw.

One side of the annular bottom surface b is in contact with the medium, and the other side is in contact with the cover plate. The size of the annular bottom surface b is the same as that of the bottom surface of the dielectric resonance column, so as to ensure that the medium is in sealing contact with the cover plate and the current can be well transmitted.

The outer edge c is in contact with the cover plate.

The outer edge c of the conductive elastic body can also be designed as a shape with holes, as long as the contact with the cover plate is ensured to generate resilience, see FIG. 5 .

The conductive elastomer can also only have an annular bottom surface b and a central hole a, see FIG. 6 .

It should be noted that the minimum diameter of the annular bottom surface b must be the same as the diameter of the bottom surface of the dielectric resonant column, so as to ensure the sealing of the medium and ensure good current transmission. Of course, the diameter of the annular bottom surface b may be greater than the diameter of the bottom surface of the dielectric resonance column. The above are only examples of the specific shape of the conductive elastic body. The shape and size of the conductive elastic body can be designed according to the needs, as long as the medium and the cover plate are in sealed contact and the current transmission between the medium and the cover plate is smooth.

Refer to FIG. 7 for the structure of the second embodiment of the dielectric resonator of the present invention.

The lower surface of the dielectric resonance column 302 is welded to the bottom surface of the metal cavity 304;

The dielectric resonance column 302 is in close contact with the cover plate 303 through the conductive elastic body 301 .

The welding connection method is more conducive to current transmission, can reduce current loss, and is conducive to improving the filtering performance of the dielectric resonator.

The dielectric resonator also includes two radio frequency connectors 306 .

The radio frequency connector 306 is disposed on the side of the metal cavity 304 for signals entering and leaving the dielectric resonator.

One of the two radio frequency connectors 306 can be used as a signal input terminal, and the other can be used as a signal output terminal.

The dielectric resonator also includes a tuning screw 305 .

The tuning screw 305 is located at the center of the dielectric resonator, passes through the cover plate 303 and the conductive elastic body 301, and is used to adjust the frequency of the dielectric resonator.

It should be noted that the tuning screw 305 may also be installed on the bottom surface of the dielectric resonator, that is, through the bottom surface of the metal cavity 304 .

The dielectric resonator provided by the embodiment of the present invention can ensure the sealed contact between the medium and the cover plate, smooth current transmission, prevent current leakage, and improve the filtering performance of the dielectric resonator. Since the conductive elastic body is a very thin reed, the upper surface is directly in surface contact with the cover plate, which reduces the volume of the entire dielectric resonator, saves space and saves materials.

The invention also provides a dielectric filter.

The dielectric filter provided by the embodiments of the present invention includes one or more dielectric resonators as described in the previous embodiments. The dielectric filter is connected together by one or more dielectric resonators to form a multi-order dielectric filter. The connection method can be serial connection or the like.

The dielectric filter provided by the invention can make the medium of the dielectric resonant column and the cover plate well sealed to prevent current leakage, thereby improving the filtering performance of the dielectric filter.

An embodiment of the present invention also provides a method for assembling a dielectric resonator, including:

Fix the lower surface of the dielectric resonance column with the metal cavity;

The upper surface of the dielectric resonance column is connected with the cover plate through a conductive elastic body.

Here, the assembly method of the dielectric resonator is not limited to the above two steps, and may also include the step of silver-plating the conductive elastomer, in order to enhance the conductivity.

The conductive elastic body and the cover plate are welded together by welding, and the bottom surface of the dielectric resonance column is welded with the bottom surface of the metal cavity, which is more conducive to current transmission, thereby reducing current loss and improving the dielectric resonator. filtering performance.

Those of ordinary skill in the art can understand that all or part of the steps in the implementation of the above method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed , may include the contents of the foregoing communication method implementations. The storage medium referred to here, such as: ROM/RAM, magnetic disk, optical disk, etc.

Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be executed during execution When the method comprises the following steps: fixing the lower surface of the dielectric resonant column with the metal cavity; connecting the upper surface of the dielectric resonant column with the cover plate through a conductive elastic body.

Claims (10)

1. A dielectric resonator, comprising a dielectric resonance column and a metal cavity, the dielectric resonance column is located in the metal cavity, and the bottom surface of the dielectric resonance column is in contact with the bottom surface of the metal cavity; it is characterized in that , also includes: cover plate and conductive elastomer; The cover plate is located on the upper surface of the metal cavity and is used to seal the metal cavity; The conductive elastic body is located between the cover plate and the dielectric resonant column, and is used to make the cover plate contact with the medium in the dielectric resonant column. 2. The dielectric resonator according to claim 1, wherein the conductive elastic body is a silver-plated reed. 3. The dielectric resonator according to claim 2, wherein the reed is made of beryllium copper. 4. The dielectric resonator according to claim 3, wherein the reed piece made of beryllium copper is welded together with the cover plate. 5. The dielectric resonator according to claim 1, characterized in that the upper surface and the lower surface of the dielectric resonant column are both plated with silver. 6. The dielectric resonator according to claim 1, wherein the lower surface of the dielectric resonant column is welded to the bottom surface of the metal cavity. 7. The dielectric resonator according to claim 6, further comprising two radio frequency connectors; the radio frequency connectors are arranged on the side of the metal cavity for signals to enter and exit the dielectric resonator. 8. The dielectric resonator according to claim 7, further comprising a tuning screw; the tuning screw passes through the cover plate and the conductive elastic body for adjusting the frequency of the dielectric resonator. 9. A dielectric filter, characterized in that the dielectric filter is formed by connecting one or more dielectric resonators as claimed in claim 1. 10. A method for assembling a dielectric resonator, comprising: Fix the lower surface of the dielectric resonance column with the metal cavity; The upper surface of the dielectric resonance column is connected with the cover plate through a conductive elastic body.

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