CN219717235U - Resonator and filter - Google Patents

Abstract

The embodiment of the utility model discloses a resonator and a filter, wherein the resonator comprises a shell, a cover plate, a metal resonant rod, a dielectric resonant rod and a conductive elastic piece, wherein the cover plate is connected to the outer side of an opening of a resonant cavity of the shell in a covering way, the metal resonant rod is fixedly connected in the resonant cavity, the dielectric resonant rod is positioned in a connecting cavity of the metal resonant rod, the conductive elastic piece is arranged in the connecting cavity and is positioned between the metal resonant rod and the dielectric resonant rod, and the dielectric resonant rod and the metal resonant rod can keep good conductive contact through the conductive elastic piece, and meanwhile, the whole resonator can realize stable axial contact. The resonator has the advantages of simple structure, low cost and easy realization of mass production.

Description

Resonator and filter

Technical Field

The utility model relates to the technical field of electronic devices, in particular to a resonator and a filter.

Background

In radio communication, a filter is widely used as a frequency selecting means. The resonant rod is a main component in the filter, the resonant frequency can be changed by changing the shape and the size of the resonant rod and the material of the resonant rod, and if the frequency is lower, the index of the filter can be achieved only by adopting the resonant rod made of dielectric materials. The common resonator is mainly an elastic resonant rod structure, wherein a metal resonant rod in the elastic resonant rod structure has elasticity, the metal resonant rod is in interference connection with a dielectric resonant rod in the axial direction, the metal resonant rod is deformed under pressure, and the dielectric resonant rod is tightly attached to the metal resonant rod and the dielectric resonant rod and the cover plate by the reaction force. However, the structural design and the manufacture are complex, the material of the metal resonant rod has extremely small optional space, the cost is high, and the mass production is difficult.

Disclosure of Invention

Therefore, the embodiment of the utility model provides the resonator and the filter, and the resonator has the advantages of simple structure, low cost and easy realization of mass production.

In a first aspect, embodiments of the present utility model provide a resonator, including:

a housing including a resonant cavity having an opening;

the cover plate covers the outer side of the opening of the resonant cavity and is connected with the shell;

the metal resonant rod is arranged in the resonant cavity and fixedly connected to the bottom of the shell, and comprises a connecting cavity and is in contact with the cover plate;

the dielectric resonance rod is connected in the connecting cavity, and one end of the dielectric resonance rod extends out of the connecting cavity;

the conductive elastic piece is arranged in the connecting cavity and is positioned between the dielectric resonance rod and the bottom of the connecting cavity, and the dielectric resonance rod is in conductive connection with the metal resonance rod through the conductive elastic piece.

Further, the resonator further comprises an insulating sleeve sleeved on the outer side of the dielectric resonance rod, the insulating sleeve is arranged in the connecting cavity, and the dielectric resonance rod, the insulating sleeve and the metal resonance rod are in radial transition fit.

Further, the conductive elastic piece is a conductive elastic pad.

Further, the conductive elastic member is a conductive spring.

Further, the conductive elastic piece is a conductive elastic reed.

Further, the connecting cavity comprises an upper cavity and a lower cavity which are communicated with each other, a connecting step is formed between the upper cavity and the lower cavity, a flanging is arranged at the top end of the upper cavity, the medium resonance rod and the conductive elastic piece are arranged in the upper cavity, and the conductive elastic piece is arranged between the medium resonance rod and the connecting step.

Further, the shell also comprises a mounting table, the mounting table is convexly arranged on the bottom surface of the resonant cavity, and the metal resonant rod is fixed on the mounting table.

Further, the dielectric resonance rod comprises a through inner cavity, and the inner cavity is communicated with the lower cavity.

Further, the resonator further comprises a tuning screw rod and a nut connected with the tuning screw rod, the tuning screw rod is in threaded connection with the cover plate, the tuning screw rod penetrates through the cover plate and stretches into the inner cavity, and the nut is located on the outer side of the cover plate.

In a second aspect, an embodiment of the present utility model further provides a filter, which includes the resonator according to the first aspect.

The embodiment of the utility model provides a resonator and a filter, the resonator comprises a shell, a cover plate, a metal resonant rod, a dielectric resonant rod and a conductive elastic piece, wherein the cover plate is connected to the outer side of a resonant cavity opening of the shell in a covering mode, the metal resonant rod is fixedly connected in the resonant cavity, the dielectric resonant rod is positioned in a connecting cavity of the metal resonant rod, the conductive elastic piece is arranged in the connecting cavity and is positioned between the metal resonant rod and the dielectric resonant rod, and the dielectric resonant rod and the metal resonant rod can keep good conductive contact through the conductive elastic piece so as to be firmly grounded, and meanwhile, the whole resonator can realize stable axial contact. The resonator has the advantages of simple structure, low cost and easy realization of mass production.

Drawings

The above and other objects, features and advantages of the present utility model will become more apparent from the following description of embodiments of the present utility model with reference to the accompanying drawings, in which:

fig. 1 is a cross-sectional view of a resonator of a first embodiment of the utility model;

fig. 2 is a cross-sectional view of a resonator according to a second embodiment of the utility model;

fig. 3 is a cross-sectional view of a resonator according to a third embodiment of the utility model;

fig. 4 is a schematic structural view of a conductive elastic reed according to a third embodiment of the present utility model;

fig. 5 is a cross-sectional view of the housing of the first, second and third embodiments of the present utility model;

fig. 6 is a cross-sectional view of a metal resonant rod according to a first, second and third embodiment of the present utility model.

Reference numerals illustrate:

10-a housing; 11-a resonant cavity; 12-a mounting table; 13-a threaded hole; 14-screws; 20-cover plate; 30-a metal resonant rod; 31-connecting the cavity; 311-upper chamber; 312-lower chamber; 32-connecting steps; 33-flanging; 34-through holes; 40-dielectric resonance bar; 41-lumen; 50-a conductive elastic member; 51-ring segments; 52-shrapnel; 60-insulating sleeve; 70-tuning a screw; 80-nut.

Detailed Description

The present utility model is described below based on examples, but the present utility model is not limited to only these examples. In the following detailed description of the present utility model, certain specific details are set forth in detail. The present utility model will be fully understood by those skilled in the art without the details described herein. Well-known methods, procedures, flows, components and circuits have not been described in detail so as not to obscure the nature of the utility model.

Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that the drawings are not necessarily drawn to scale.

Unless the context clearly requires otherwise, the words "comprise," "comprising," and the like throughout the application are to be construed as including but not being exclusive or exhaustive; that is, it is the meaning of "including but not limited to".

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

Fig. 1-3 are cross-sectional views of resonators of embodiments of the present utility model. As shown in fig. 1 to 3, the resonator of the embodiment of the present utility model includes a housing 10, a cover plate 20, a metal resonance rod 30, a dielectric resonance rod 40, a conductive elastic member 50, an insulating sleeve 60, and a tuning screw 70.

As shown in fig. 5, one end of the housing 10 is provided as an open end, and inside is a resonant cavity 11. As shown in fig. 1 to 3, the cover plate 20 covers the open end of the housing 10 and is fixedly connected with the housing 10, the dielectric resonance rod 40, the conductive elastic member 50 and the metal resonance rod 30 are sequentially disposed in the resonance cavity 11, and the metal resonance rod 30 is disposed at the bottom of the housing 10. Alternatively, the cover 20 may be connected to the housing 10 by a screw, or may be connected to the housing 10 by conductive glue.

In order to maintain good electrical conductivity between the housing 10 and the cover 20, the housing 10 and the cover 20 are made of surface metallization material. Specifically, the surfaces of the case 10 and the cover 20 may be silver-plated or copper-plated. Alternatively, the base materials of the housing 10 and the cover 20 may be metal materials, such as aluminum alloy materials, or plastic materials.

Further, the dielectric resonator rod 40 is sintered from a ceramic material having a high dielectric constant. Wherein the ceramic material is typically an oxide of calcium lanthanum aluminum titanium.

As shown in fig. 1-3, the metal resonant rod 30 includes a connecting cavity 31. The dielectric resonator rod 40 and the conductive elastic member 50 are located in the connection chamber 31. The conductive elastic member 50 is located between the dielectric resonator rod 40 and the bottom of the connection cavity 31, so as to ensure that good conductive contact is maintained between the dielectric resonator rod 40 and the metal resonator rod 30. One end of the dielectric resonator rod 40 protrudes from the inside of the connection chamber 31 to contact the cover plate 20. Thereby, the reaction force generated by the deformation of the conductive elastic member 50 can enable the resonator to achieve stable axial contact. The cover plate 20, the dielectric resonance rod 40, the metal resonance rod 30 and the conductive elastic member 50 are mutually abutted and are in conductive connection so as to be stably grounded.

In an alternative implementation, the connection chamber 31 includes an upper chamber 311 and a lower chamber 312, as shown in FIG. 6. The outer dimension of the upper cavity 311 is larger than that of the lower cavity 312, and the upper cavity 311 and the lower cavity 312 are communicated and form a connecting step 32. The connection step 32 is the bottom surface of the upper cavity 311. The top end of the upper cavity 311 is an open end, and the top end of the upper cavity 311 bends and extends in a direction away from the connecting cavity to form a flange 33. The arrangement of the flange 33 can enlarge the coupling capacitance between the metal resonant rod 30 and the cover plate 20 and adjust the resonant cavity frequency. The bottom of the lower cavity 312 is provided with a through hole 34 to enable the screw 14 to fixedly connect the metal resonance bar 30 with the housing 10. Alternatively, the bending angle of the flange 33 may be parallel to the connecting step 32, or any other suitable angle.

Optionally, the upper cavity 311 and the lower cavity 312 are circular cavities with cross sections and are coaxially arranged, so as to enhance the axial stability of the resonator according to the embodiment of the present utility model.

Further, as shown in fig. 5, a mounting table 12 is protruded on a side opposite to the open end in the resonator 11, and the height thereof is determined by the filter temperature drift index of the present embodiment. Alternatively, the mounting table 12 may be integrally connected with the housing 10, or may be two parts independently separated from the housing 10. The mounting table 12 is provided with a threaded hole 13 as shown in fig. 6. As shown in fig. 1 to 3, the screw 14 is screwed through the through hole 34 of the lower cavity 312 of the metal resonant rod 30 and the threaded hole 13 of the mounting table 12, so that the metal resonant rod 30 can be fixedly connected to the housing 10, so as to limit the movement of the metal resonant rod 30 in the resonant cavity 11, and increase the stability of the resonator in the axial direction. Further, when the distance between the metal resonant rod 30 and the dielectric resonant rod 40 and the cover plate 20 is kept unchanged, the resonant frequency of the resonant cavity 11 can be adjusted by adjusting the diameter of the mounting table 12, so as to achieve a better tuning effect.

As shown in fig. 1-3, the outer dimension of the dielectric resonator rod 40 is greater than the outer dimension of the lower cavity 312 and smaller than the outer dimension of the upper cavity 311, and the outer dimension of the dielectric resonator rod 40 is equal to the outer dimension of the conductive elastic member 50. Thereby, the dielectric resonator rod 40 and the conductive elastic member 50 can be stably disposed in the upper cavity 311 of the connection cavity 31. The conductive elastic member 50 is positioned between the dielectric resonance rod 40 and the connection step 32 of the metal resonance rod 30, and its upper and lower ends are respectively electrically connected with one end of the dielectric resonance rod 40 and the connection step 32 of the metal resonance rod 30. One end of the dielectric resonator rod 40 protrudes from the open end of the connection chamber 31 and is connected in contact with the cap plate 20 by the reaction force of the conductive elastic member 50. Further, the dielectric resonator 11 is provided with a through inner cavity 41, and the inner cavity 41 communicates with the lower cavity 312.

Further, the dielectric resonance rod 40, the metal resonance rod 30 and the conductive elastic member 50 are in interference connection in the axial direction, and the conductive elastic member 50 can ensure that the dielectric resonance rod 40 and the metal resonance rod 30 keep good conductive contact, and meanwhile, the reaction force generated by deformation of the dielectric resonance rod 40 and the metal resonance rod 30 enables the whole resonator to realize stable axial contact.

In an alternative embodiment, the conductive elastic member 50 in the embodiment of the present utility model is a conductive elastic pad, as shown in fig. 1. The conductive elastic pad is configured as an annular structure, and the inner ring size of the conductive elastic pad is greater than or equal to the inner contour size of the lower cavity 312 of the metal resonant rod 30, so that the inner cavity 41 of the dielectric resonant rod 40 can be communicated with the lower cavity 312. The conductive elastic gasket has small volume and long service life.

In another alternative embodiment, the conductive elastic member 50 of the present embodiment is a conductive spring, as shown in fig. 2. The elastic performance of the conductive spring is better, so that the axial connection of the resonator is more stable.

In an alternative embodiment, the conductive spring element 50 of the present utility model is a conductive spring reed, as shown in fig. 3-4. The conductive spring leaf consists of an annular plate 51 with a circular through hole and a plurality of folded spring plates 52. One end of the plurality of elastic pieces 52 is uniformly wound around the outer ring connected to the annular piece 51, and the rest is bent toward the center of the annular piece 51 and forms a certain angle. The folding of the spring 52 provides the conductive spring reed with good spring properties, which can make the axial connection between the entire resonator more stable. The angle formed between the plurality of spring plates 52 and the annular plate 51 enables the conductive elastic reed to have a certain supporting capacity so as to realize stable abutting of the conductive elastic reed on the connecting step 32 of the metal resonant rod 30.

The conductive elastic member 50 according to the embodiment of the present utility model may be any elastic member having conductivity.

The resonator of the embodiment of the utility model further comprises an insulating sleeve 60. The insulating sleeve 60 is disposed in the connection cavity 31 and is sleeved outside the dielectric resonator rod 40, as shown in fig. 1 to 3. Further, the dielectric resonance rod 40, the metal resonance rod 30 and the insulating sleeve 60 are in transition fit in the radial direction, and the insulating sleeve 60 can ensure good concentricity of the dielectric resonance rod 40 and the metal resonance rod 30, avoid unnecessary electric connection between the dielectric resonance rod 40 and the metal resonance rod 30, and improve intermodulation stability of the resonator.

Optionally, a part of the structure of the conductive elastic member 50 is also sleeved in the insulating sleeve 60, so that the radial stability of the conductive elastic member is increased, and unnecessary electrical connection between the dielectric resonant rod 40 and the inner side of the connecting cavity 31 of the metal resonant rod 30 through the conductive elastic member 50 can be avoided.

The resonator of the present embodiment further includes a tuning screw 70 and a nut 80, as shown in fig. 1-3. The nut 80 is located on the outside of the cover plate 20 and is connected to the tuning screw 70 to increase the stability of the tuning screw 70 when adjusted. The tuning screw 70 is screwed to the cover plate 20 and protrudes through the cover plate 20 into the interior space 41 of the dielectric resonator rod 40. The tuning screw 70 is made of surface metallization material. Specifically, the tuning screw 70 may be made of silver or copper plated pieces. Further, the tuning screw 70 is electrically connected to the cover 20, and a portion of the tuning screw 70 extending into the cavity 41 forms a capacitive coupling with the dielectric resonator rod 40. The resonator of the embodiment of the present utility model can change the magnitude of the coupling capacitance by adjusting the depth of the tuning screw 70 in the inner cavity 41, thereby adjusting the resonant frequency of the resonator.

Further, the embodiment of the utility model also provides a filter, which comprises the resonator.

The resonator of this embodiment is through being provided with conductive elastic component between dielectric resonance pole and metal resonance pole, when realizing conductive contact between dielectric resonance pole and the metal resonance pole, can also realize the stable axial contact of whole resonator, simultaneously, still overlap in the outside of dielectric resonance pole and be equipped with insulating boot, be transition fit in the radial between dielectric resonance pole, metal resonance pole and the insulating boot, both can guarantee that concentricity between dielectric resonance pole and the metal resonance pole is good, also can avoid unnecessary electric connection between dielectric resonance pole and the metal resonance pole. The resonator can keep stable contact in the radial direction and the axial direction, the functional efficiency of the resonator during tuning is improved, and in addition, the resonator has a simple structure, low cost and easy realization of mass production.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A resonator, the resonator comprising:

a housing (10) comprising a resonant cavity (11) with an opening;

a cover plate (20) which covers the outside of the opening of the resonant cavity (11) and is connected with the shell (10);

the metal resonant rod (30) is arranged in the resonant cavity (11) and is fixedly connected to the bottom of the shell (10), and the metal resonant rod (30) comprises a connecting cavity (31);

a dielectric resonance rod (40) connected in the connection cavity (31) and one end of the dielectric resonance rod (40) extends out of the connection cavity (31) and is in contact with the cover plate (20);

the conductive elastic piece (50) is arranged in the connecting cavity (31) and is positioned between the dielectric resonance rod (40) and the bottom of the connecting cavity (31), and the dielectric resonance rod (40) and the metal resonance rod (30) are connected in a conductive mode through the conductive elastic piece (50).

2. The resonator according to claim 1, characterized in that it further comprises an insulating sleeve (60) sleeved outside the dielectric resonator rod (40), and the insulating sleeve (60) is disposed in the connecting cavity (31), and the dielectric resonator rod (40), the insulating sleeve (60) and the metal resonator rod (30) are radially transition-fitted.

3. Resonator according to claim 1 or 2, characterized in that the conductive elastic element (50) is a conductive elastic pad.

4. Resonator according to claim 1 or 2, characterized in that the conductive elastic element (50) is a conductive spring.

5. Resonator according to claim 1 or 2, characterized in that the conductive elastic element (50) is a conductive elastic reed.

6. Resonator according to claim 1, characterized in that the connecting cavity (31) comprises an upper cavity (311) and a lower cavity (312) which are in communication with each other, a connecting step (32) is formed between the upper cavity (311) and the lower cavity (312), the top end of the upper cavity (311) is provided with a flange (33), the dielectric resonator rod (40) and the conductive elastic member (50) are arranged in the upper cavity (311), and the conductive elastic member (50) is arranged between the dielectric resonator rod (40) and the connecting step (32).

7. The resonator according to claim 1, characterized in that the housing (10) further comprises a mounting table (12) protruding on the bottom surface of the resonator chamber (11), the metal resonator rod (30) being fixed on the mounting table (12).

8. The resonator according to claim 6, characterized in that the dielectric resonator rod (40) comprises a through-going inner cavity (41), the inner cavity (41) being in communication with the lower cavity (312).

9. The resonator according to claim 8, characterized in that it further comprises a tuning screw (70) and a nut (80) connected to the tuning screw (70), the tuning screw (70) being screwed to the cover plate (20) and extending through the cover plate (20) into the inner cavity (41), the nut (80) being located outside the cover plate (20).

10. A filter, characterized in that the filter comprises a resonator as claimed in any one of claims 1-9.