CN210142706U - Duplexer, dielectric filter and capacitive coupling structure thereof - Google Patents

Abstract

The utility model discloses a duplexer, a dielectric filter and a capacitive coupling structure thereof. The capacitive coupling structure comprises a dielectric resonator arranged between two adjacent dielectric resonators in a dielectric body, according to a first preset length and a preset length. A first adjustment groove with a depth setting is provided, one end of the first adjustment groove is spaced from one side wall of the medium body, and the other end of the first adjustment groove is communicated with the other side wall of the medium body or The other end of the first adjustment groove communicates with the isolation window. The capacitive coupling structure has low production difficulty and is convenient for subsequent production debugging; thus, the production difficulty of the dielectric filter using the capacitive coupling structure is low, and the production debugging difficulty is low; The production difficulty of the duplexer is low, and the production debugging difficulty is low.

Description

Duplexer, dielectric filter and capacitive coupling structure

technical field

The utility model relates to the technical field of filters, in particular to a duplexer, a dielectric filter and a capacitive coupling structure thereof.

Background technique

With the rapid development of communication technology, in order to meet the needs of use, communication devices are increasingly miniaturized. Dielectric filters are widely used in communication equipment because of their miniaturization.

In order to achieve good loss and suppression effects, the dielectric filter usually achieves better performance and smaller volume by increasing the cross-coupling method, so a capacitive coupling structure needs to be set on the dielectric filter. For the purpose of capacitive coupling in dielectric filters, the traditional method usually sets a deep hole between two adjacent dielectric resonators in the dielectric body, and adjusts the distance between the bottom wall of the deep hole and the lower surface of the dielectric body. In order to adjust the capacitive coupling bandwidth, the smaller the distance between the bottom wall of the deep hole and the lower surface of the dielectric body, the smaller the capacitive coupling bandwidth. In order to achieve a small capacitive coupling bandwidth, the bottom wall of the deep hole and the dielectric The distance between the lower surfaces of the main body needs to be small enough. In the sintering process of the production process, it is not conducive to sintering molding, which increases the difficulty of production and is not conducive to subsequent production debugging.

Utility model content

Based on this, a duplexer, a dielectric filter and a capacitive coupling structure thereof are proposed. The capacitive coupling structure has low production difficulty and is convenient for subsequent production and debugging; thus, the dielectric using the capacitive coupling structure The production difficulty of the filter is low, and the production debugging difficulty is low; thus, the production difficulty of the duplexer using the dielectric filter is low, and the production debugging difficulty is low.

Its technical solutions are as follows:

In one aspect, a capacitive coupling structure of a dielectric filter is provided, including a first adjustment groove set between two adjacent dielectric resonators in a dielectric body and set according to a first preset length and a preset depth, One end of the first adjusting groove is spaced from one side wall of the medium body, and the other end of the first adjusting groove is communicated with the other side wall of the medium body or the other end of the first adjusting groove Connect with the isolated window.

In the capacitive coupling structure of the above-mentioned dielectric filter, a first adjustment groove with a preset depth is flexibly opened between two adjacent dielectric resonators of the dielectric body according to the first preset length, so that one end of the first adjustment groove is connected to the first adjustment groove. One side wall of the medium body is spaced apart, and the other end of the first adjusting groove is communicated with the other side wall of the medium body, that is, the first adjusting groove extends to the other side wall of the medium body, or the other end of the first adjusting groove is connected to the other side wall of the medium body. Isolated window communication. The capacitive coupling structure of the above dielectric filter can flexibly adjust the capacitive coupling bandwidth by flexibly adjusting the opening depth of the first adjustment slot and the length of the first adjustment slot, compared with the traditional blind hole form. , in order to achieve a small capacitive coupling bandwidth, it is not necessary to adjust the depth of the first adjustment groove separately, which improves the flexibility of design, reduces the difficulty of production, facilitates mass production, and facilitates subsequent production debugging; at the same time, It can realize a relatively wide capacitive coupling bandwidth, has good consistency and good performance, saves the production cost, and is convenient for the control of different zero points of the dielectric filter.

The technical solution is further described below:

In one embodiment, the bottom wall of the first adjusting groove is provided with a second adjusting groove according to a second preset length, the second adjusting groove runs through the medium body, and one end of the second adjusting groove is connected to the The other side wall of the medium body communicates with or one end of the second adjustment groove communicates with the isolation window. In this way, by arranging the second adjustment slot, the capacitive coupling bandwidth can be further flexibly adjusted.

In one embodiment, the length of the second adjustment groove is W ₁ , and W ₁ is adjustable. In this way, by adjusting the length of the second adjustment slot, the capacitive coupling bandwidth can be further flexibly adjusted.

In one of the embodiments, the side wall of the other end of the second adjusting groove is set as a first circular arc segment, and/or the side wall of one end of the first adjusting groove is set as a second circular arc segment. In this way, the processing of the first adjustment groove and the second adjustment groove is facilitated.

In one embodiment, the length of the first adjustment groove is W ₂ , and W ₂ is adjustable, and/or the depth of the first adjustment groove is H, and H is adjustable. In this way, the adjustment method is flexible, the structure is simple and convenient, and the processing is convenient.

In one of the embodiments, the dielectric body includes at least three dielectric resonators arranged in parallel, the first adjustment slot is provided between two adjacent dielectric resonators, and the first adjustment groove is One end of the adjusting groove is spaced from one side wall of the medium body, and the other end of the first adjusting groove is communicated with the other side wall of the medium body.

In one of the embodiments, the dielectric resonator is provided with an adjustment hole for adjusting the frequency. In this way, the frequency can be adjusted according to actual needs.

In one of the embodiments, the dielectric body includes four dielectric resonators, and the four dielectric resonators are arranged in two rows and two columns, and the dielectric body is provided with a device for isolating the four dielectric resonators. The first adjustment slot is arranged between two adjacent dielectric resonators, one end of the first adjustment slot is spaced from a side wall of the dielectric body, and the first adjustment slot is The other end of the adjustment groove communicates with the isolation window.

In another aspect, a dielectric filter is provided, including the capacitive coupling structure.

In the above-mentioned dielectric filter, a first adjustment groove with a preset depth is flexibly opened between two adjacent dielectric resonators of the dielectric body according to the first preset length, so that one end of the first adjustment groove is connected to one side of the dielectric body. The walls are spaced apart, and the other end of the first adjusting groove communicates with the other side wall of the medium body, that is, the first adjusting groove extends to the other side wall of the medium body, or the other end of the first adjusting groove communicates with the isolation window. The above dielectric filter can flexibly adjust the capacitive coupling bandwidth by flexibly adjusting the opening depth of the first adjustment slot and the length of the first adjustment slot. The capacitive coupling bandwidth does not need to adjust the depth of the first adjustment groove separately, which improves the flexibility of design, reduces the difficulty of production, facilitates mass production, and facilitates subsequent production debugging; at the same time, it can achieve a fairly wide Capacitive coupling bandwidth, good consistency, good performance, saving production costs, and facilitating the control of different zero points of the dielectric filter.

In yet another aspect, a duplexer is provided, including the dielectric filter.

In the above duplexer, a first adjustment groove with a preset depth is flexibly opened between two adjacent dielectric resonators of the dielectric body according to the first preset length, so that one end of the first adjustment groove is connected to one side of the dielectric body. The walls are spaced apart, and the other end of the first adjusting groove communicates with the other side wall of the medium body, that is, the first adjusting groove extends to the other side wall of the medium body, or the other end of the first adjusting groove communicates with the isolation window. The above-mentioned duplexer can flexibly adjust the capacitive coupling bandwidth by flexibly adjusting the opening depth of the first adjustment slot and the length of the first adjustment slot. The capacitive coupling bandwidth does not need to adjust the depth of the first adjustment groove separately, which improves the flexibility of design, reduces the difficulty of production, facilitates mass production, and facilitates subsequent production debugging; at the same time, it can achieve a fairly wide Capacitive coupling bandwidth, good consistency, good performance, saving production costs, and facilitating the control of different zero points of the dielectric filter.

Description of drawings

1 is a schematic structural diagram of a first surface of a capacitive coupling structure of a dielectric filter according to an embodiment;

FIG. 2 is a cross-sectional view of part A-A of the capacitive coupling structure of the dielectric filter of FIG. 1;

3 is a schematic structural diagram of a second surface of the capacitive coupling structure of the dielectric filter of FIG. 1;

4 is a cross-sectional view of part B-B of the capacitive coupling structure of the dielectric filter of FIG. 3;

5 is a schematic structural diagram of a first surface of a capacitive coupling structure of a dielectric filter according to another embodiment;

6 is a cross-sectional view of a portion C-C of a capacitive coupling structure of the dielectric filter of FIG. 5;

FIG. 7 is a schematic structural diagram of the second surface of the capacitive coupling structure of the dielectric filter of FIG. 5;

FIG. 8 is a cross-sectional view of part D-D of the capacitive coupling structure of the dielectric filter of FIG. 7;

9 is a schematic structural diagram of a dielectric body of a capacitive coupling structure of a dielectric filter according to an embodiment;

FIG. 10 is a graph showing the relationship between W and capacitive coupling bandwidth of a capacitive coupling structure of a dielectric filter according to an embodiment _;

FIG. 11 is a graph showing the relationship between W and capacitive coupling bandwidth of a capacitive coupling structure of a dielectric filter according to another embodiment _;

12 is a graph showing the relationship between H and capacitive coupling bandwidth of a capacitive coupling structure of a dielectric filter according to an embodiment;

FIG. 13 is a graph showing the relationship between W ₁ of the capacitive coupling structure of the dielectric filter and the capacitive coupling bandwidth according to an embodiment.

Description of reference numbers:

100, medium body, 110, isolation window, 120, first adjustment groove, 121, second arc segment, 130, second adjustment slot, 131, first arc segment, 140, first surface, 150, second Surface, 200, Conductive Layer, 1000, Dielectric Resonator, 1100, Adjustment Hole.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and do not limit the protection scope of the present invention.

It should be noted that when an element is referred to as being "disposed on" or "fixed on" another element, it can be directly on the other element or an intervening element may also be present. When an element is referred to as being "fixed to" another element, or "fixedly connected" to another element, it may be detachable or non-detachable. When an element is referred to as being "connected" or "rotationally connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Similar terms such as "first", "second", "third" and the like mentioned in the present utility model do not represent a specific quantity and order, but are only used for the distinction of names.

As shown in FIG. 1 to FIG. 4 , in one embodiment, a capacitive coupling structure of a dielectric filter is disclosed, including a dielectric resonator 1000 disposed between two adjacent dielectric resonators 1000 in the dielectric body 100 , according to the first A first adjustment groove 120 with a preset length and a preset depth, one end of the first adjustment groove 120 is spaced from one side wall of the medium body 100 , and the other end of the first adjustment groove 120 is spaced from the other side wall of the medium body 100 The other end of the communication or first adjustment groove 120 communicates with the isolation window 110 .

In the capacitive coupling structure of the dielectric filter in the above-mentioned embodiment, a first adjustment groove 120 with a preset depth is flexibly opened according to the first preset length between the two adjacent dielectric resonators 1000 of the dielectric body 100, so that the One end of an adjusting groove 120 is spaced from one side wall of the medium body 100 , and the other end of the first adjusting groove 120 is communicated with the other side wall of the medium body 100 , that is, the first adjusting groove 120 extends to the other side wall of the medium body 100 . The side wall, or the other end of the first adjusting groove 120 communicates with the isolation window 110 . The capacitive coupling structure of the dielectric filter in the above-mentioned embodiment can flexibly adjust the capacitive coupling bandwidth by flexibly adjusting the opening depth of the first adjustment slot 120 and the length of the first adjustment slot 120 . In the form of blind holes, in order to achieve a small capacitive coupling bandwidth, it is not necessary to adjust the depth of the first adjustment groove 120 separately, which improves the flexibility of design, reduces the difficulty of production, facilitates mass production, and facilitates subsequent follow-up. At the same time, it can achieve quite wide capacitive coupling bandwidth, good consistency, good performance, save production costs, and facilitate the control of different zero points of the dielectric filter.

It should be noted that, one side wall of the first adjusting groove 120 and the other side wall of the medium body 100 refer to two side walls that are different from the medium body, for example, two side walls that are relatively spaced apart.

In one embodiment, the depth of the first adjustment groove 120 is H, and H is adjustable. The depth of the first adjustment groove 120 can be flexibly adjusted according to actual use requirements, as long as the capacitive coupling bandwidth can be flexibly adjusted by changing the depth of the first adjustment groove 120 .

In one embodiment, the length of the first adjustment groove 120 is W ₂ , and W ₂ is adjustable. The length of the first adjustment slot 120 can be flexibly adjusted according to actual use requirements, as long as the capacitive coupling bandwidth can be flexibly adjusted by changing the length of the first adjustment slot 120 .

It should be noted that the depth of the first adjustment groove 120 and the length of the first adjustment groove 120 can be adjusted at the same time or separately, preferably at the same time. Compared with the traditional blind hole form, the simultaneous adjustment can be adjusted. Improve design flexibility, reduce production difficulty, and facilitate debugging. The first adjustment groove 120 is preferably in the shape of a long strip or a straight line, which is convenient for processing and also facilitates the adjustment of the length of the first adjustment groove 120; The length and depth of the adjustment slot 120 can be adjusted to adjust the capacitive coupling bandwidth.

As shown in FIGS. 1 to 3 , in one embodiment, the bottom wall of one end of the first adjusting groove 120 is provided with a second adjusting groove 130 according to a second preset length, and the second adjusting groove 130 penetrates through the medium body 100 . One end of the second adjusting groove 130 communicates with the other side wall of the medium body 100 or one end of the second adjusting groove 130 communicates with the isolation window 110 . In this way, the second adjustment slot 130 is simply and conveniently formed on the bottom wall of the first adjustment slot 120 according to the second preset length, and the capacitive coupling bandwidth is further adjusted by changing the length of the second adjustment slot 130 . Further enhance the flexibility of adjustment.

Further, the length of the second adjusting groove 130 is W ₁ , and W ₁ is adjustable. In this way, the second preset length can also be flexibly adjusted according to actual use requirements, as long as the capacitive coupling bandwidth can be flexibly adjusted by changing the length of the second adjustment slot 130 . The contour shape of the second adjustment slot 130 may be arc shape, straight line or strip shape, as long as the length of the second adjustment slot 130 can be adjusted so that the capacitive coupling bandwidth can be adjusted accordingly.

As shown in FIG. 1 , further, the side wall of the other end of the second adjusting groove 130 is set as a first arc segment 131 . In this way, it is convenient to process the second adjusting groove 130 on the bottom wall of the first adjusting groove 120, which further reduces the difficulty of production. Of course, in other embodiments, the side wall of the other end of the second adjustment slot 130 can also be set as a right-angle transition section, as long as the length of the second adjustment slot 130 can be adjusted so as to be able to adjust the capacitive coupling bandwidth.

As shown in FIG. 3 , on the basis of any of the above embodiments, the side wall of one end of the first adjusting groove 120 is set as a second arc segment 121 . In this way, it is convenient to process the first adjusting groove 120 on the medium body 100, which further reduces the difficulty of production. Of course, in other embodiments, the side wall of one end of the first adjustment slot 120 can also be set as a right-angle transition section, as long as the length and depth of the first adjustment slot 120 can be adjusted so as to be able to adjust the capacitive coupling bandwidth.

On the basis of any of the above embodiments, the dielectric body 100 is integrally formed with a high dielectric constant material. In this way, the dielectric body 100 is integrally formed with a high dielectric constant material such as ceramic dielectric, which can not only play the role of transmitting signals, but also play the role of structural support. When a ceramic dielectric material is used, the dielectric body 100 can be made by die casting, which can significantly reduce the size and weight of the entire dielectric waveguide filter.

As shown in FIG. 1 and FIG. 4 , on the basis of any of the above-mentioned embodiments, the dielectric resonator 1000 is provided with an adjustment hole 1100 for adjusting the frequency. In this way, the frequency can be adjusted accordingly by using the adjustment hole 1100 . The depth of the adjustment hole 1100 can be adjusted correspondingly according to the actual required frequency, and only needs to meet the actual use requirement.

As shown in FIG. 1 to FIG. 4 , in one embodiment, the medium body 100 includes a first surface 140 and a second surface 150 which are arranged at a distance from each other, the first surface 140 is provided with adjustment holes 1100 , and the first adjustment grooves 120 are arranged in first surface 140 . In this way, both the adjustment hole 1100 and the first adjustment groove 120 are arranged on the first surface 140, and the medium body 100 does not need to be turned over during the processing, so that the adjustment hole 1100 and the first adjustment groove 120 can be quickly adjusted on one plane. After processing, the process is saved and the processing efficiency is improved. Of course, in other embodiments, as shown in FIGS. 5 to 8 , after the adjustment holes 1100 are disposed on the first surface 140 , the first adjustment grooves 120 may also be disposed on the second surface 150 , as long as the adjustment of the first surface 150 is satisfied. The capacitive coupling bandwidth can be flexibly adjusted by adjusting the length and depth of the slot 120 .

As shown in FIGS. 2 to 4 and 5 to 8, in order to achieve a narrow capacitive coupling bandwidth while reducing the difficulty of production, making the design and processing simple and easy to assemble, the length of the second adjustment slot 130 (represented by W ₁ ) , the length (represented by W ₂ ) and the depth (represented by H ) of the first adjusting groove 120 , and the distance (represented by W ₃ ) between the other end of the first adjusting groove 120 and the side wall of the medium body 100 , can be It can be adjusted flexibly according to the actual requirements, so that the debugging can be repeated and the difficulty of design and debugging is reduced.

As shown in FIG. 10 , in one embodiment, the length W ₁ of the second adjusting groove 130 is 0 mm, the depth H of the first adjusting groove 120 is 0.7 mm, and the other end of the first adjusting groove 120 is connected to the side of the medium body 100 . The distance between the walls W ₃ =2mm, the capacitive coupling bandwidth can be adjusted accordingly by changing the length of the first adjusting slot 120 , that is, adjusting the size of W ₂ , wherein, the larger W ₂ is, the greater the capacitive coupling bandwidth is. Small.

As shown in FIG. 11 , in one embodiment, the length W ₁ of the second adjusting groove 130 is 0 mm, the depth H of the first adjusting groove 120 is 2 mm, and the other end of the first adjusting groove 120 is connected to the side wall of the medium body 100 . The distance W ₃ =2mm, the capacitive coupling bandwidth can be adjusted accordingly by changing the length of the first adjusting slot 120 , that is, adjusting the size of W ₂ , wherein the larger W ₂ is, the smaller the capacitive coupling bandwidth is .

As shown in FIG. 12 , in one embodiment, the length of the second adjusting groove 130 is W ₁ =0 mm, the length of the first adjusting groove 120 is W ₂ =9 mm, and the other end of the first adjusting groove 120 is connected to the side of the medium body 100 . The distance between the walls W ₃ =2mm, the capacitive coupling bandwidth can be adjusted accordingly by changing the depth of the first adjusting groove 120 , that is, adjusting the size of H, wherein the smaller H is, the smaller the capacitive coupling bandwidth is.

As shown in FIG. 13 , in one embodiment, the length W ₂ of the first adjusting groove 120 is 9 mm, the depth H of the first adjusting groove 120 is 0.7 mm, and the other end of the first adjusting groove 120 is connected to the side wall of the medium body 100 . The distance between them is W ₃ =2mm. By changing the length of the second adjusting slot 130, that is, adjusting the size of W ₁ , the capacitive coupling bandwidth can be adjusted accordingly. The smaller W ₁ is, the smaller the capacitive coupling bandwidth is. .

As shown in FIG. 9 , in one embodiment, the dielectric body 100 includes at least three dielectric resonators 1000 arranged in parallel, a first adjustment slot 120 is provided between two adjacent dielectric resonators 1000 , and the first adjustment One end of the groove 120 is spaced from one side wall of the medium body 100 , and the other end of the first adjusting groove 120 is communicated with the other side wall of the medium body 100 . In this way, the dielectric resonators 1000 of the dielectric body 100 are arranged in a line shape, which is convenient for processing and also facilitates subsequent adjustment of the depth or length of the first adjustment groove 120 .

In one embodiment, the dielectric body 100 includes three dielectric resonators 1000 arranged in parallel, a first adjustment slot 120 is provided between the first dielectric resonator 1000 and the second dielectric resonator 1000, and the first One end of the adjustment slot 120 is spaced from one side wall of the dielectric body 100, and the other end of the first adjustment slot 120 is communicated with the other side wall of the dielectric body 100; the second dielectric resonator 1000 is connected to the third dielectric resonator A first adjustment groove 120 is arranged between the 1000, one end of the first adjustment groove 120 is spaced from one side wall of the medium body 100, and the other end of the first adjustment groove 120 is spaced from the other side wall of the medium body 100 The bottom wall of the other end of the first adjusting groove 120 is provided with a second adjusting groove 130 .

In one embodiment, the dielectric body 100 includes four dielectric resonators 1000 arranged in parallel, a first adjustment slot 120 is provided between the first dielectric resonator 1000 and the second dielectric resonator 1000, and the first One end of the adjustment slot 120 is spaced from one side wall of the dielectric body 100, and the other end of the first adjustment slot 120 is communicated with the other side wall of the dielectric body 100; the second dielectric resonator 1000 is connected to the third dielectric resonator A first adjustment groove 120 is arranged between the 1000, one end of the first adjustment groove 120 is spaced from one side wall of the medium body 100, and the other end of the first adjustment groove 120 is spaced from the other side wall of the medium body 100 and the bottom wall of the other end of the first adjusting groove 120 is provided with a second adjusting groove 130; a first adjusting groove 120 is provided between the third dielectric resonator 1000 and the fourth dielectric resonator 1000, One end of the first adjusting groove 120 is spaced from one side wall of the medium body 100 , and the other end of the first adjusting groove 120 is communicated with the other side wall of the medium body 100 .

As shown in FIG. 1 to FIG. 8 , in one embodiment, the dielectric body 100 includes four dielectric resonators 1000 , the four dielectric resonators 1000 are arranged in two rows and two columns, and the dielectric In the isolation window 110 of the dielectric resonator, a first adjustment slot 120 is provided between two adjacent dielectric resonators 1000 . The other end is communicated with the isolation window 110 . In this way, the four dielectric resonators 1000 are arranged in two rows and two columns to form the dielectric body 100 , an isolation window 110 for blocking energy transfer between the dielectric resonators 1000 is provided in the middle of the dielectric body 100 , and adjacent A first adjustment slot 120 is arranged between the two dielectric resonators 1000, so that one end of the first adjustment slot 120 is spaced from one side wall of the dielectric body 100, and the other end of the first adjustment slot 120 is communicated with the isolation window 110; The length of the first adjustment slot 120 and the depth of the first adjustment slot 120 are adjusted accordingly to adjust the capacitive coupling bandwidth accordingly. A second adjusting groove 130 can also be formed on the bottom wall of the first adjusting groove 120 close to the isolation window 110 according to a second preset length. The lengths of the two adjustment slots 130 , or simultaneously adjusting the length of the first adjustment slot 120 , the depth of the first adjustment slot 120 and the length of the second adjustment slot 130 , can adjust the capacitive coupling bandwidth accordingly. The outer wall (the first surface 140 , the second surface 150 , the side wall, the inner wall of the first adjustment groove 120 , the inner wall of the second adjustment groove 130 , the inner wall of the isolation window 110 , the adjustment hole 1100 ) of the dielectric body 100 are then electroplated. the inner wall) to form a conductive layer 200, thereby forming an electrical wall and playing an electromagnetic shielding role. The diameter of the isolation window 110 can be flexibly adjusted according to actual needs, so as to achieve the purpose of flexibly adjusting the capacitive coupling bandwidth.

In one embodiment, a dielectric filter is also disclosed, which includes the capacitive coupling structure of any of the foregoing embodiments.

In the dielectric filter of the above-mentioned embodiment, a first adjustment groove 120 with a preset depth is flexibly opened between two adjacent dielectric resonators 1000 of the dielectric body 100 according to the first preset length, so that the first adjustment groove 120 has a predetermined depth. One end is spaced from one side wall of the medium body 100, and the other end of the first adjusting groove 120 is communicated with the other side wall of the medium body 100, that is, the first adjusting groove 120 extends to the other side wall of the medium body 100, or the first adjusting groove 120 extends to the other side wall of the medium body 100. The other end of an adjusting groove 120 communicates with the isolation window 110 . The dielectric filter of the above-mentioned embodiment can flexibly adjust the capacitive coupling bandwidth by flexibly adjusting the opening depth of the first adjusting groove 120 and the length of the first adjusting groove 120, compared with the traditional blind hole method. , in order to achieve a small capacitive coupling bandwidth, it is not necessary to adjust the depth of the first adjustment groove 120 separately, which improves the flexibility of design, reduces the difficulty of production, facilitates mass production, and facilitates subsequent production debugging; , can achieve a fairly wide capacitive coupling bandwidth, good consistency, good performance, save production costs, and facilitate the control of different zero points of the dielectric filter.

In one embodiment, a duplexer is also disclosed, including the dielectric filter of the above embodiment.

In the duplexer of the above-mentioned embodiment, a first adjustment groove 120 of a preset depth is flexibly opened between two adjacent dielectric resonators 1000 of the dielectric body 100 according to the first preset length, so that the One end is spaced from one side wall of the medium body 100, and the other end of the first adjusting groove 120 is communicated with the other side wall of the medium body 100, that is, the first adjusting groove 120 extends to the other side wall of the medium body 100, or the first adjusting groove 120 extends to the other side wall of the medium body 100. The other end of an adjusting groove 120 communicates with the isolation window 110 . The duplexer of the above-mentioned embodiment can flexibly adjust the capacitive coupling bandwidth by flexibly adjusting the opening depth of the first adjustment slot 120 and the length of the first adjustment slot 120, compared with the traditional blind hole method. , in order to achieve a small capacitive coupling bandwidth, it is not necessary to adjust the depth of the first adjustment groove 120 separately, which improves the flexibility of design, reduces the difficulty of production, facilitates mass production, and facilitates subsequent production debugging; , can achieve a fairly wide capacitive coupling bandwidth, good consistency, good performance, save production costs, and facilitate the control of different zero points of the dielectric filter.

The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features It is considered to be the range described in this specification.

The above embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a restriction on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, some modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for this utility model shall be subject to the appended claims.

Claims (10)

1. A capacitive coupling structure of a dielectric filter, characterized in that it comprises a first adjustment groove set between two adjacent dielectric resonators in a dielectric body and set according to a first preset length and a preset depth , one end of the first adjustment groove is spaced from one side wall of the medium body, and the other end of the first adjustment groove is communicated with the other side wall of the medium body or the other side of the first adjustment groove. One end communicates with the isolation window. 2 . The capacitive coupling structure of a dielectric filter according to claim 1 , wherein the bottom wall of the first adjustment groove is provided with a second adjustment groove according to a second preset length, and the second adjustment groove Passing through the medium body, one end of the second adjusting groove communicates with the other side wall of the medium body or one end of the second adjusting groove communicates with the isolation window. 3 . The capacitive coupling structure of a dielectric filter according to claim 2 , wherein the length of the second adjustment slot is W ₁ , and W ₁ is adjustable. 4 . 4 . The capacitive coupling structure of a dielectric filter according to claim 2 , wherein the side wall of the other end of the second adjustment groove is set as a first arc segment, and/or the first adjustment The side wall of one end of the slot is set as a second arc segment. 5 . The capacitive coupling structure of a dielectric filter according to claim 1 , wherein the length of the first adjustment slot is W ₂ , and W ₂ is adjustable, and/or the length of the first adjustment slot is W 2 . The depth is H, and H is adjustable. 6. The capacitive coupling structure of a dielectric filter according to any one of claims 1 to 5, wherein the dielectric body comprises at least three dielectric resonators arranged in parallel, and the adjacent two are The first adjustment groove is arranged between the dielectric resonators, and one end of the first adjustment groove is spaced from one side wall of the dielectric body, and the other end of the first adjustment groove is connected to the dielectric body. connected to the other side wall. 7 . The capacitive coupling structure of a dielectric filter according to claim 1 , wherein the dielectric resonator is provided with an adjustment hole for adjusting the frequency. 8 . 8 . The capacitive coupling structure of a dielectric filter according to claim 1 , wherein the dielectric body comprises four dielectric resonators, and the four dielectric resonators are arranged in two rows. 9 . It is arranged in two rows, and the dielectric body is provided with an isolation window for isolating the four dielectric resonators, and the first adjustment slot is provided between two adjacent dielectric resonators. One end of the adjustment groove is spaced from one side wall of the medium body, and the other end of the first adjustment groove is communicated with the isolation window. 9. A dielectric filter, comprising the capacitive coupling structure according to any one of claims 1 to 8. 10. A duplexer, comprising the dielectric filter according to claim 9.

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