A method for manufacturing a dielectric waveguide filter and a dielectric waveguide filter

Abstract

The present invention relates to a method for manufacturing a dielectric waveguide filter and a dielectric waveguide filter. First, a shape of a coupling adjustment region is set on a metal layer of an outer wall of a dielectric waveguide filter body. Then, the metal layer outside a first preset shape is removed in the coupling adjustment region to obtain a capacitive coupling structure, thereby obtaining a dielectric waveguide filter with a capacitive coupling structure. When the dielectric waveguide filter with a capacitive coupling structure is used in an electronic product, capacitive coupling between two adjacent resonant cavities is achieved through the capacitive coupling structure. The processing process is simple, the manufacturing efficiency is high, it is conducive to mass production, and the yield rate is high. That is, the dielectric waveguide filter with a capacitive coupling structure can be obtained by simply modifying and processing the existing dielectric waveguide filter body that cannot achieve capacitive coupling.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method for manufacturing a dielectric waveguide filter and a dielectric waveguide filter. Background Art

[0002] As a frequency selection device, dielectric waveguide filter can allow specific frequency components in the signal to pass through while greatly attenuating other frequency components. As the 5G communication system has higher and higher requirements for the miniaturization of base station equipment, dielectric waveguide filters are increasingly used due to their advantages such as small size, low insertion loss, high power handling and low cost. In practical applications, dielectric waveguide filters need to form capacitive coupling to achieve transmission zero points. At present, the capacitive coupling of the two resonant cavities of the dielectric waveguide filter is usually achieved by making blind holes at the coupling connection positions of the two resonant cavities of the dielectric waveguide filter, and the size of the capacitive coupling is controlled by setting the distance between the bottom of the blind hole and the bottom surfaces of the two resonant cavities. When the capacitive coupling amount is required to be small, the blind hole needs to be very deep to meet the requirement, which greatly increases the processing difficulty of the dielectric waveguide filter, has low manufacturing efficiency, is not conducive to mass production, and has a low yield rate. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for manufacturing a dielectric waveguide filter in view of the deficiencies in the prior art.

[0004] The technical solution of a method for manufacturing a dielectric waveguide filter of the present invention is as follows:

[0005] S1. Setting the shape of the coupling adjustment region on the metal layer of the outer wall of the dielectric waveguide filter body, wherein the dielectric waveguide filter body includes at least two resonant cavities;

[0006] S2. Removing the metal layer outside the first preset shape in the coupling adjustment region to form a capacitive coupling structure, so as to obtain a dielectric waveguide filter having the capacitive coupling structure; wherein the capacitive coupling structure surrounds the first preset shape, the capacitive coupling structure is distributed on the outer surfaces of any two adjacent resonant cavities of the dielectric waveguide filter, and the length of the capacitive coupling structure is not less than 1 / 2 wavelength of the operating frequency of the dielectric waveguide filter.

[0007] The beneficial effects of the method for manufacturing a dielectric waveguide filter of the present invention are as follows:

[0008] First, the shape of the coupling adjustment area is set on the metal layer of an outer wall of the dielectric waveguide filter body, and then the metal layer outside the first preset shape is removed in the coupling adjustment area to obtain a capacitive coupling structure, thereby obtaining a dielectric waveguide filter with a capacitive coupling structure. When the dielectric waveguide filter with a capacitive coupling structure is used in an electronic product, capacitive coupling between two adjacent resonant cavities is achieved through the capacitive coupling structure. The processing process is simple, the manufacturing efficiency is high, it is conducive to mass production, and the yield rate is high. That is to say, the dielectric waveguide filter with a capacitive coupling structure can be obtained by simply modifying and processing the existing dielectric waveguide filter body that cannot achieve capacitive coupling.

[0009] Based on the above scheme, the method for manufacturing a dielectric waveguide filter of the present invention can also be improved as follows.

[0010] Furthermore, it also includes:

[0011] S3. Removing the metal layer of the second preset shape within the first preset shape to change the capacitive coupling amount of the dielectric waveguide filter, and the remaining metal layer after removing the metal layer of the second preset shape within the first preset shape is continuous.

[0012] The beneficial effect of adopting the above further solution is that the capacitive coupling amount of the dielectric waveguide filter is changed by removing part of the metal layer within the first preset shape, and the processing process is simple.

[0013] Furthermore, the second preset shape is a graphic or a plurality of mutually independent graphics.

[0014] The beneficial effect of adopting the above further solution is that it is more convenient to set the second preset shape.

[0015] Furthermore, when the second preset shape is a figure, the first preset shape is an ellipse, a circle, a rectangle or a dumbbell.

[0016] Furthermore, when the second preset shape is a plurality of mutually independent figures, each of the mutually independent figures is an ellipse, a circle or a rectangle.

[0017] Furthermore, the coupling adjustment area is in a rectangular, elliptical or circular shape, and the first preset shape is in an elliptical, circular, rectangular or dumbbell shape.

[0018] Furthermore, the metal layer is a silver-plated metal layer or a copper-plated metal layer.

[0019] Furthermore, the dielectric waveguide filter body includes a first resonant cavity and a second resonant cavity, an inductive coupling window is provided between the first resonant cavity and the second resonant cavity, and the capacitive coupling structure is distributed on the outer surfaces of the first resonant cavity and the second resonant cavity.

[0020] The beneficial effect of adopting the above further scheme is: by distributing the capacitive coupling structure on the outer surfaces of the first resonant cavity and the second resonant cavity, a dielectric waveguide filter with a capacitive coupling structure is obtained. When the dielectric waveguide filter with a capacitive coupling structure is used in an electronic product, capacitive coupling between the first resonant cavity and the second resonant cavity is achieved through the capacitive coupling structure.

[0021] Furthermore, the dielectric waveguide filter body includes a plurality of resonant cavities arranged in pairs, and the capacitive coupling structure is distributed on the outer surface of any pair of resonant cavities.

[0022] The beneficial effect of adopting the above further scheme is: by distributing the capacitive coupling structure on the outer surface of any pair of resonant cavities, a dielectric waveguide filter with a capacitive coupling structure is obtained. When the dielectric waveguide filter with a capacitive coupling structure is used in an electronic product, capacitive coupling between the pair of resonant cavities is achieved through the capacitive coupling structure.

[0023] Furthermore, two input / output coupling blind holes are relatively arranged on the dielectric waveguide filter body.

[0024] Furthermore, a tuning blind hole is respectively arranged on each resonant cavity of the dielectric waveguide filter body.

[0025] A dielectric waveguide filter of the present invention is manufactured by using any of the above-mentioned methods for manufacturing a dielectric waveguide filter, so as to obtain a dielectric waveguide filter with a capacitive coupling structure. When the dielectric waveguide filter with a capacitive coupling structure is used in an electronic product, capacitive coupling between two adjacent resonant cavities is achieved through the capacitive coupling structure. The manufacturing process is simple, the manufacturing efficiency is high, and it is conducive to mass production and has a high yield rate. In other words, the dielectric waveguide filter with a capacitive coupling structure can be obtained by simply modifying and processing the existing dielectric waveguide filter body that cannot achieve capacitive coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 One of the flow charts of a method for manufacturing a dielectric waveguide filter according to an embodiment of the present invention;

[0027] Figure 2 FIG2 is a second flow chart of a method for manufacturing a dielectric waveguide filter according to an embodiment of the present invention;

[0028] Figure 3A schematic diagram of the three-dimensional structure of a dielectric waveguide filter having a capacitive coupling structure;

[0029] Figure 4 for Figure 3 A top view structural diagram of a dielectric waveguide filter with a capacitive coupling structure;

[0030] Figure 5 A top view structural diagram of a dielectric waveguide filter having another capacitive coupling structure;

[0031] Figure 6 A schematic diagram of the three-dimensional structure of another dielectric waveguide filter with a capacitive coupling structure. DETAILED DESCRIPTION

[0032] like Figure 1 As shown, a method for manufacturing a dielectric waveguide filter according to an embodiment of the present invention, wherein the dielectric waveguide filter comprises at least two resonant cavities, comprises the following steps:

[0033] S1. Arranging the shape of the coupling adjustment region 1 on the metal layer of the outer wall of the dielectric waveguide filter body, wherein the dielectric waveguide filter body includes at least two resonant cavities;

[0034] S2. Removing the metal layer outside the first preset shape 2 in the coupling adjustment region 1 to form a capacitive coupling structure 3, so as to obtain a dielectric waveguide filter having the capacitive coupling structure 3; wherein the capacitive coupling structure 3 surrounds the first preset shape 2, the capacitive coupling structure 3 is distributed on the outer surfaces of any two adjacent resonant cavities of the dielectric waveguide filter, and the length of the capacitive coupling structure 3 is not less than 1 / 2 wavelength of the operating frequency of the dielectric waveguide filter.

[0035] First, the shape of the coupling adjustment region 1 is set on the metal layer of an outer wall of the dielectric waveguide filter body, and then, the metal layer outside the first preset shape 2 is removed in the coupling adjustment region 1, so that the capacitive coupling structure 3 can be obtained, thereby obtaining a dielectric waveguide filter having the capacitive coupling structure 3. When the dielectric waveguide filter having the capacitive coupling structure 3 is used in an electronic product, the capacitive coupling between two adjacent resonant cavities is realized through the capacitive coupling structure 3, the processing process is simple, the manufacturing efficiency is high, it is conducive to mass production, and the yield rate is high. That is to say, the dielectric waveguide filter having the capacitive coupling structure 3 can be obtained by simply modifying and processing the existing dielectric waveguide filter body that cannot realize capacitive coupling.

[0036] It can be understood that the relationship between the coupling adjustment region 1, the first preset shape 2 and the capacitive coupling structure 3 is: the area of ​​the coupling adjustment region 1 is the sum of the areas of the first preset shape 2 and the capacitive coupling structure 3, wherein a metal layer exists in the first preset shape 2, and the metal layer in the capacitive coupling structure 3 has been removed.

[0037] Among them, the outer surface of the dielectric waveguide filter is covered with a metal layer, which is well known to those skilled in the art and will not be described in detail here. According to the working frequency requirement of the dielectric waveguide filter, a coupling adjustment area 1 is set on the metal layer of an outer wall of the dielectric waveguide filter. It can be understood that, according to actual conditions, one outer wall can be selected from all the outer walls of the dielectric waveguide filter to set the coupling adjustment area 1. The metal layer outside the first preset shape 2 can be removed in the coupling adjustment area 1 by printing, etching or photolithography, etc., to obtain a capacitive coupling structure 3, and it is easy to meet higher precision requirements, such as ±0.03mm precision requirements, and it is simple to manufacture and low cost.

[0038] The capacitive coupling structure 3 may be evenly distributed on the outer surfaces of any two adjacent resonant cavities of the dielectric waveguide filter, or the capacitive coupling structure 3 may be distributed on the outer surfaces of any two adjacent resonant cavities of the dielectric waveguide filter according to actual conditions, wherein the length of the capacitive coupling structure 3 is not less than 1 / 2 wavelength of the operating frequency of the dielectric waveguide filter. When the dielectric waveguide filter having the capacitive coupling structure 3 is applied in electronic devices such as mobile phones, computers, radars, etc., the capacitive coupling, i.e., negative coupling, between the two adjacent resonant cavities is realized through the capacitive coupling structure 3, thereby generating a transmission zero point and improving the out-of-band suppression capability.

[0039] Preferably, in the above technical solution, if Figure 2 As shown, it also includes:

[0040] S3. Remove the metal layer of the second preset shape in the first preset shape 2 to change the capacitive coupling amount of the dielectric waveguide filter, and the remaining metal layer after removing the metal layer of the second preset shape in the first preset shape (2) is continuous.

[0041] When it is necessary to change the size of the capacitive coupling amount between the two resonant cavities connected by the capacitive coupling structure 3, by removing part of the metal layer in the first preset shape 2, the size of the capacitive coupling amount of the dielectric waveguide filter can be changed to meet the requirements, and the processing process is simple, wherein the removal can be performed by etching process, engraving process or grinding process.

[0042] It can be understood that the first preset shape 2 surrounds the second preset shape to ensure that the second preset shape will not divide the metal layer in the first preset shape 2 into two or more independent parts, that is, the remaining metal layer after removing the metal layer of the second preset shape in the first preset shape 2 is continuous, otherwise when the dielectric waveguide filter with the capacitive coupling structure 3 is applied in electronic devices such as mobile phones, computers, radars or wireless communication equipment, the capacitive coupling structure 3 cannot achieve capacitive coupling between two adjacent resonant cavities.

[0043] Preferably, in the above technical solution, the second preset shape is one figure or a plurality of mutually independent figures. Specifically:

[0044] When the second preset shape is a figure, the first preset shape 2 is an ellipse, a circle, a rectangle or a dumbbell.

[0045] When the second preset shape is a plurality of mutually independent figures, each of the mutually independent figures is an ellipse, a circle or a rectangle.

[0046] Among them, the second preset shape can also be set to other shapes according to actual conditions. The second preset shape can also be composed of multiple independent pictures to ensure that the remaining metal layer after removing the metal layer of the second preset shape from the first preset shape 2 is continuous.

[0047] like Figure 3 , Figure 4 and Figure 5 As shown, preferably, in the above technical solution, the coupling adjustment area 1 is in a rectangular, elliptical or circular shape, and the first preset shape 2 is in an elliptical, circular, rectangular or dumbbell shape. It can be understood that the coupling adjustment area 1 can also be set to other shapes according to actual conditions. It should be noted that the coupling adjustment area 1 should be continuous and a whole; the first preset shape 2 can also be set to other shapes according to actual conditions. It should be noted that the first preset shape 2 should be continuous and a whole;

[0048] The length of the capacitive coupling structure 3 may be understood as: the sum of the lengths of the various parts of the capacitive coupling structure 3 or the length determined according to the center of gravity positions of the various parts, and the process of obtaining the length of the capacitive coupling structure 3 in the dielectric waveguide filter is well known to those skilled in the art and will not be elaborated herein.

[0049] Preferably, in the above technical solution, the metal layer is a silver-plated metal layer or a copper-plated metal layer.

[0050] like Figure 3As shown, preferably, in the above technical solution, the dielectric waveguide filter body includes a first resonant cavity 4 and a second resonant cavity 5, an inductive coupling window 6 is provided between the first resonant cavity 4 and the second resonant cavity 5, and the capacitive coupling structure 3 is distributed on the outer surfaces of the first resonant cavity 4 and the second resonant cavity 5.

[0051] By distributing the capacitive coupling structure 3 on the outer surfaces of the first resonant cavity 4 and the second resonant cavity 5, when the dielectric waveguide filter having the capacitive coupling structure 3 is applied to an electronic device, the capacitive coupling between the first resonant cavity 4 and the second resonant cavity 5 is realized through the capacitive coupling structure 3. It can be understood that the dielectric waveguide filter may also include other resonant cavities, and a tuning blind hole may be provided on each resonant cavity, etc., to further optimize the performance of the dielectric waveguide filter.

[0052] In this embodiment, the inductive coupling window 6 is two arc-shaped notches arranged opposite to each other. The inductive coupling window 6 can also be arranged in other structures. Since the arrangement of the inductive coupling window 6 belongs to the prior art, the inductive coupling window 6 can be arranged in various required shapes, which will not be described in detail here.

[0053] Preferably, in the above technical solution, the dielectric waveguide filter body includes a plurality of resonant cavities arranged in pairs, and the capacitive coupling structure is distributed on the outer surface of any pair of resonant cavities. Specifically:

[0054] like Figure 6 As shown, the dielectric waveguide filter includes a third resonant cavity 7, a fourth resonant cavity 8, a fifth resonant cavity 9, a sixth resonant cavity 10, a seventh resonant cavity 11 and an eighth resonant cavity 12 coupled in sequence, the third resonant cavity 7 is arranged opposite to the eighth resonant cavity 12, the fourth resonant cavity 8 is arranged opposite to the seventh resonant cavity 11, the fifth resonant cavity 9 is arranged opposite to the sixth resonant cavity 10, and the capacitive coupling structure 3 is distributed on the outer surface of the fourth resonant cavity 8 and the seventh resonant cavity 11, or the capacitive coupling structure 3 is distributed on the outer surface of the fifth resonant cavity 9 and the sixth resonant cavity 10.

[0055] By distributing the capacitive coupling structure 3 on the outer surfaces of the fourth resonant cavity 8 and the seventh resonant cavity 11, when the dielectric waveguide filter having the capacitive coupling structure 3 is applied in an electronic device, the capacitive coupling between the fourth resonant cavity 8 and the seventh resonant cavity 11 is realized through the capacitive coupling structure 3; or, by distributing the capacitive coupling structure 3 on the outer surfaces of the fifth resonant cavity 9 and the sixth resonant cavity 10, when the dielectric waveguide filter having the capacitive coupling structure 3 is applied in an electronic device, the capacitive coupling between the fifth resonant cavity 9 and the sixth resonant cavity 10 is realized through the capacitive coupling structure 3.

[0056] Among them, by arranging two T-shaped or cross-shaped inductive coupling windows 6 on the dielectric waveguide filter, sequential coupling between the third resonant cavity 7, the fourth resonant cavity 8, the fifth resonant cavity 9, the sixth resonant cavity 10, the seventh resonant cavity 11 and the eighth resonant cavity 12 is realized, wherein the positions of the two T-shaped or cross-shaped inductive coupling windows 6 on the dielectric waveguide filter are well known to those skilled in the art and will not be described in detail herein.

[0057] It can be understood that the third resonant cavity 7 and the eighth resonant cavity 12 can also be inductively coupled through the T-shaped or cross-shaped inductive coupling window 6, which does not affect the capacitive coupling between the fourth resonant cavity 8 and the seventh resonant cavity 11.

[0058] Preferably, in the above technical solution, two input / output coupling blind holes are relatively arranged on the dielectric waveguide filter body, specifically:

[0059] The third resonant cavity 7 and the eighth resonant cavity 12 are respectively provided with an input / output coupling blind hole. That is to say, the first input / output coupling blind hole 13 is provided on the third resonant cavity 7, and the second input / output coupling blind hole 14 is provided on the eighth resonant cavity 12. It can be understood that when the first input / output coupling blind hole 13 is used as a signal input interface, the corresponding second input / output coupling blind hole 14 is used as a signal output interface, and vice versa.

[0060] The following is an example of a signal transmission path. Specifically:

[0061] 1) When the capacitive coupling structure 3 is distributed on the outer surface of the fourth resonant cavity 8 and the seventh resonant cavity 11, the first input / output coupling blind hole 13 is used as the signal access interface, and the second input / output coupling blind hole 14 is used as the signal output interface, then the signal transmission path is:

[0062] The first input / output coupling blind hole 13→the third resonant cavity 7→the fourth resonant cavity 8→the fifth resonant cavity 9→the sixth resonant cavity 10→the seventh resonant cavity 11→the eighth resonant cavity 12→the second input / output coupling blind hole 14, wherein, since the third resonant cavity 7 to the eighth resonant cavity 12 are inductively coupled in sequence, the fourth resonant cavity 8 and the seventh resonant cavity 11 are capacitively coupled, wherein the four resonant cavities of the fourth resonant cavity 8, the fifth resonant cavity 9, the sixth resonant cavity 10 and the seventh resonant cavity 11 form a cross-coupling of the CQ structure of the dielectric waveguide filter, thereby generating a transmission zero at each end of the passband of the dielectric waveguide filter, thereby improving the out-of-band suppression capability.

[0063] 2) When the capacitive coupling structure 3 is distributed on the outer surface of the fifth resonant cavity 9 and the sixth resonant cavity 10, the first input / output coupling blind hole 13 is used as the signal access interface, and the second input / output coupling blind hole 14 is used as the signal output interface, then the signal transmission path is:

[0064] The first input / output coupling blind hole 13→the third resonant cavity 7→the fourth resonant cavity 8→the fifth resonant cavity 9→the sixth resonant cavity 10→the seventh resonant cavity 11→the eighth resonant cavity 12→the second input / output coupling blind hole 14, wherein the third resonant cavity 7 to the fifth resonant cavity 9 are inductively coupled in sequence, the sixth resonant cavity 10 to the eighth resonant cavity 12 are inductively coupled in sequence, the fourth resonant cavity 8 and the seventh resonant cavity 11 are inductively coupled, and the fifth resonant cavity 9 and the sixth resonant cavity 10 are capacitively coupled, wherein the four resonant cavities of the fourth resonant cavity 8, the fifth resonant cavity 9, the sixth resonant cavity 10 and the seventh resonant cavity 11 form a cross-coupling of the CQ structure of the dielectric waveguide filter, thereby generating a transmission zero at each end of the passband of the dielectric waveguide filter, thereby improving the out-of-band suppression capability.

[0065] Preferably, in the above technical solution, the third resonant cavity 7, the fourth resonant cavity 8, the fifth resonant cavity 9, the sixth resonant cavity 10, the seventh resonant cavity 11 and the eighth resonant cavity 12 are respectively provided with a tuning blind hole, and the resonant cavity corresponding to the tuning blind hole can be tuned by removing the metal layer in any tuning blind hole.

[0066] A dielectric waveguide filter according to an embodiment of the present invention is manufactured by using a manufacturing method of a dielectric waveguide filter described in any of the above embodiments, so as to obtain a dielectric waveguide filter having a capacitive coupling structure 3. When the dielectric waveguide filter having the capacitive coupling structure 3 is used in an electronic product, capacitive coupling between two adjacent resonant cavities is achieved through the capacitive coupling structure 3. The processing process is simple, the manufacturing efficiency is high, and it is conducive to mass production and has a high yield rate. In other words, the dielectric waveguide filter having the capacitive coupling structure 3 can be obtained by simply modifying and processing the existing dielectric waveguide filter body that cannot achieve capacitive coupling.

[0067] A wireless communication device according to an embodiment of the present invention comprises a dielectric waveguide filter having a capacitive coupling structure 3 according to any of the above embodiments.

[0068] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for manufacturing a dielectric waveguide filter, It is characterized in that include: S1. Arranging the shape of the coupling adjustment region (1) on the metal layer of the outer wall of the dielectric waveguide filter body, wherein the dielectric waveguide filter body comprises at least two resonant cavities; S2. Removing the metal layer outside the first preset shape (2) in the coupling adjustment region (1) to form a capacitive coupling structure (3), thereby obtaining a dielectric waveguide filter having the capacitive coupling structure (3); wherein the capacitive coupling structure (3) surrounds the first preset shape (2), the capacitive coupling structure (3) is distributed on the outer surfaces of any two adjacent resonant cavities of the dielectric waveguide filter, and the length of the capacitive coupling structure (3) is not less than 1 / 2 wavelength of the operating frequency of the dielectric waveguide filter; S3, removing the metal layer of the second preset shape in the first preset shape (2) to change the capacitive coupling amount of the dielectric waveguide filter, and the remaining metal layer after removing the metal layer of the second preset shape in the first preset shape (2) is continuous; The second preset shape is one figure or a plurality of mutually independent figures; When the second preset shape is a figure, the first preset shape (2) is an ellipse, a circle, a rectangle or a dumbbell; When the second preset shape is a plurality of mutually independent figures, each of the mutually independent figures is an ellipse, a circle or a rectangle.

2. A method for manufacturing a dielectric waveguide filter according to claim 1, It is characterized in that The coupling adjustment area (1) is in the shape of a rectangle, an ellipse or a circle, and the first preset shape (2) is in the shape of an ellipse, a circle, a rectangle or a dumbbell.

3. A method for manufacturing a dielectric waveguide filter according to claim 1 or 2, It is characterized in that The dielectric waveguide filter body comprises a first resonant cavity (4) and a second resonant cavity (5), an inductive coupling window (6) is provided between the first resonant cavity (4) and the second resonant cavity (5), and the capacitive coupling structure (3) is distributed on the outer surfaces of the first resonant cavity (4) and the second resonant cavity (5).

4. A method for manufacturing a dielectric waveguide filter according to claim 1 or 2, It is characterized in that The dielectric waveguide filter body comprises a plurality of resonant cavities arranged in pairs, and the capacitive coupling structure is distributed on the outer surface of any pair of resonant cavities.

5. The method for manufacturing a dielectric waveguide filter according to claim 4, It is characterized in that Two input / output coupling blind holes are also arranged opposite to each other on the dielectric waveguide filter body.

6. A dielectric waveguide filter, It is characterized in that The dielectric waveguide filter is manufactured by the manufacturing method of any one of claims 1 to 5.

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