Dielectric Waveguide Filters

Abstract

The embodiment of the present invention discloses a dielectric waveguide filter, the dielectric waveguide filter comprising: a dielectric body, the dielectric body is provided with a plurality of isolation through slots and a plurality of frequency tuning blind holes; the dielectric body is also provided with at least two port signal transmission holes; the port signal transmission holes and at least part of the frequency tuning blind holes are located on two opposite sides of the dielectric body; and in the thickness direction of the dielectric body, the port signal transmission holes and the frequency tuning blind holes do not overlap. The dielectric waveguide filter of the embodiment of the present invention can achieve miniaturization while improving the out-of-band suppression capability.

Description

Technical Field

[0001] The embodiments of the present invention relate to filter technology, and in particular to a dielectric waveguide filter. Background Art

[0002] With the development of 5G communications, the application of dielectric waveguide filters is becoming more and more extensive, and correspondingly, the performance requirements for dielectric waveguide filters are becoming higher and higher.

[0003] In order to improve the out-of-band suppression capability of the dielectric waveguide filter, it is usually necessary to set the dielectric waveguide filter to a multi-zero point structure; however, in the prior art, in order to realize the multi-zero points of the dielectric waveguide filter, it is usually necessary to set a capacitive coupling column or a double-sided cavity row method, however, the method based on the capacitive coupling column makes the later debugging of the dielectric waveguide filter more difficult; and the method based on the double-sided cavity row makes the size of the dielectric waveguide filter larger, and the later debugging and process are more difficult, which limits the further application of the dielectric waveguide filter. Summary of the invention

[0004] The embodiment of the present invention provides a dielectric waveguide filter to achieve miniaturization of the dielectric waveguide filter and expand the application range of the dielectric waveguide filter.

[0005] In a first aspect, an embodiment of the present invention provides a dielectric waveguide filter, comprising: a dielectric body, on which a plurality of isolation through slots and a plurality of frequency tuning blind holes are arranged; at least two port signal transmission holes are also arranged on the dielectric body; the port signal transmission holes and at least part of the frequency tuning blind holes are located on two opposite sides of the dielectric body; and in the thickness direction of the dielectric body, the port signal transmission holes and the frequency tuning blind holes do not overlap.

[0006] Optionally, there is no capacitive coupling window between the frequency tuning blind holes of the dielectric waveguide filter.

[0007] Optionally, the frequency tuning blind holes are arranged on both the left and right sides of the port signal transmission hole.

[0008] Optionally, at least one port signal transmission hole is located at a center position between two adjacent frequency tuning blind holes.

[0009] Optionally, the plurality of frequency tuning blind holes include eight frequency tuning blind holes, and the eight frequency tuning blind holes are arranged in two rows and four columns; the isolation through slots include a first isolation through slot, a second isolation through slot and a third isolation through slot; the first isolation through slot is located between the first column of frequency tuning blind holes and the second column of frequency tuning blind holes, the second isolation through slot is located between the second column of frequency tuning blind holes and the third column of frequency tuning blind holes, and the third isolation through slot is located between the third column of frequency tuning blind holes and the fourth column of frequency tuning blind holes; the at least two port signal transmission holes include a first port signal transmission hole and a second port signal transmission hole, the first port signal transmission hole is located between the first column of frequency tuning blind holes and the second column of frequency tuning blind holes, and the second port signal transmission hole is located between the third column of frequency tuning blind holes and the fourth column of frequency tuning blind holes.

[0010] Optionally, the first isolation through groove and the third isolation through groove are in a "X" shape, and the second isolation through groove is in a "I" shape.

[0011] Optionally, the first port signal transmission hole and the second port signal transmission hole are symmetrical about a center line of the eight frequency tuning blind holes.

[0012] Optionally, the first isolation through-groove is communicated with the second isolation through-groove.

[0013] Optionally, the plurality of frequency tuning blind holes are located on a straight line.

[0014] Optionally, at least part of the frequency tuning blind holes and the port signal transmission holes are located on the same surface of the dielectric waveguide filter.

[0015] The technical solution of this embodiment adopts a dielectric waveguide filter including a dielectric body, on which a plurality of isolation slots and a plurality of frequency tuning blind holes are arranged; the dielectric body is also provided with at least two port signal transmission holes; the port signal transmission holes and at least part of the frequency tuning blind holes are located on two opposite sides of the dielectric body; and in the thickness direction of the dielectric body, the port signal transmission holes and the frequency tuning blind holes do not overlap. The input signal on the port signal transmission hole will pass through the frequency tuning blind hole to generate a signal with a phase difference of -180 degrees with the input signal, that is, a transmission zero point is generated. Since there is no need to use a capacitive coupling column to generate a transmission zero point, the difficulty of later debugging and optimization can be greatly reduced, the labor cost can be reduced, and it is conducive to the miniaturization of the dielectric waveguide filter and the expansion of the application range of the dielectric waveguide filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a dielectric waveguide filter in the prior art;

[0017] Figure 2A schematic structural diagram of a dielectric waveguide filter provided by an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of a signal flow of a dielectric waveguide filter provided by an embodiment of the present invention;

[0019] Figure 4 An S parameter curve result diagram of a dielectric waveguide filter provided by an embodiment of the present invention;

[0020] Figure 5 A schematic structural diagram of another dielectric waveguide filter provided by an embodiment of the present invention;

[0021] Figure 6 A schematic structural diagram of another dielectric waveguide filter provided by an embodiment of the present invention;

[0022] Figure 7 A schematic structural diagram of another dielectric waveguide filter provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0024] Figure 1 A schematic diagram of the structure of a dielectric waveguide filter in the prior art is shown in FIG. Figure 1 The dielectric waveguide filter includes a dielectric body 101', an isolation through slot 102', a frequency tuning blind hole 103' and a port signal transmission hole 104'. The port signal transmission hole 104' and the frequency tuning blind hole 103' are located on two opposite sides of the dielectric body 101' and are relatively located. If a transmission zero point needs to be generated, a capacitive coupling column 105' needs to be arranged on the dielectric body 101' to form a capacitive cross coupling. However, the later debugging and optimization of the capacitive coupling column 105' is difficult, which leads to high later production costs of the dielectric waveguide filter, limiting the application of the dielectric waveguide filter in 5G technology.

[0025] Based on the above technical problems, the present invention proposes the following solutions:

[0026] Figure 2 A schematic diagram of the structure of a dielectric waveguide filter provided by an embodiment of the present invention, referring to Figure 2The dielectric waveguide filter includes: a dielectric body 101, on which a plurality of isolation through slots 102 and a plurality of frequency tuning blind holes 103 are arranged; at least two port signal transmission holes 104 are also arranged on the dielectric body 101; the port signal transmission holes 104 and at least part of the frequency tuning blind holes 103 are located on two opposite sides of the dielectric body 101; and in the thickness direction of the dielectric body 101, the port signal transmission holes 104 and the frequency tuning blind holes 103 do not overlap.

[0027] Specifically, the dielectric body 101 may be a ceramic body, the frequency tuning blind hole 103 is a blind hole opened on the dielectric body 101, and a metal shielding layer, such as a copper shielding layer, may be provided on the surface of the dielectric body 101; the port signal transmission hole 104 is a blind hole opened on the dielectric body 101, and the port signal transmission hole 104 and at least part of the frequency tuning blind hole 103 are located on two opposite sides of the dielectric body 101, for example, at least part of the frequency tuning blind hole 103 is opened on the front side of the dielectric body 101, and the port signal transmission hole 104 is opened on the back side of the dielectric body 101; the port signal transmission hole 104 serves as an input port or an output port of the dielectric waveguide filter. In this embodiment, since the port signal transmission hole 104 and the frequency tuning blind hole 103 do not overlap in the thickness direction of the dielectric body 101, for example, after a signal is input from one of the port signal transmission holes 1041, the signal is transmitted in two directions, one One signal is transmitted to another port signal transmission hole 1042 through the frequency tuning blind hole (1033-1034-1035-1036), and another signal generates a signal with a phase difference of -180 degrees with the input signal of the port signal transmission hole 1041 after passing through the frequency tuning blind hole (1031-1032), that is, a group of transmission zero points are generated; it can be understood that there is also a signal in the other port signal transmission hole 1042 that generates a signal with a phase difference of -180 degrees with the input signal of the frequency tuning blind hole 103 through the frequency tuning blind hole (1037-1038), that is, another group of transmission zero points, for example, so that the dielectric waveguide filter of this embodiment can generate multiple transmission zero points; since there is no need to use a capacitive coupling column, the difficulty of later optimization and debugging can be greatly reduced, the labor cost can be greatly reduced, and the miniaturization of the dielectric waveguide filter can be achieved, and the application range of the dielectric waveguide filter can be expanded. It can be understood that the thickness direction of the dielectric body 101 is a direction perpendicular to the side of the dielectric body 101 where the frequency tuning blind hole 103 is set. In this direction, the port signal transmission hole 104 does not overlap with the frequency tuning blind hole 103, that is, the orthographic projection of the port signal transmission hole 104 in this direction does not overlap with the orthographic projection of the frequency tuning blind hole 103 in this direction.

[0028] The technical solution of this embodiment adopts a dielectric waveguide filter including a dielectric body, on which a plurality of isolation slots and a plurality of frequency tuning blind holes are arranged; the dielectric body is also provided with at least two port signal transmission holes; the port signal transmission holes and at least part of the frequency tuning blind holes are located on two opposite sides of the dielectric body; and in the thickness direction of the dielectric body, the port signal transmission holes and the frequency tuning blind holes do not overlap. The input signal on the port signal transmission hole will pass through the frequency tuning blind hole to generate a signal with a phase difference of -180 degrees with the input signal, that is, a transmission zero point is generated. Since there is no need to use a capacitive coupling column to generate a transmission zero point, the difficulty of later optimization and debugging can be greatly reduced, the labor cost can be greatly reduced, and the miniaturization of the dielectric waveguide filter can be realized to expand the application range of the dielectric waveguide filter.

[0029] Optionally, there is no capacitive coupling window between the frequency tuning blind holes 103 of the dielectric waveguide filter, that is, there is no need to set a capacitive coupling column. The frequency tuning blind holes 103 of this embodiment are all inductively cross-coupled, and their stability and consistency are better.

[0030] Optionally, continue to refer to Figure 2 , the frequency tuning blind holes 103 are arranged on both sides of the port signal transmission hole 104. That is, the port signal transmission hole 104 is arranged between adjacent frequency tuning blind holes 103. In detail, the position of the port signal transmission hole 104 between adjacent frequency tuning blind holes 103 can be adjusted according to the requirements. That is, it can be closer to a certain frequency tuning blind hole 103 or located in the middle of adjacent frequency tuning blind holes 103.

[0031] This arrangement can ensure that the input signal of the port signal transmission hole 104 will have a signal that generates a signal with a phase difference of -180 degrees with the input signal after passing through the frequency tuning blind hole 103, that is, it can ensure the generation of a transmission zero point and improve the out-of-band suppression capability of the dielectric waveguide filter.

[0032] Continue to refer Figure 2 In this embodiment and some other embodiments, at least one port signal transmission hole 104 is located at the center between the frequency tuning blind holes 103. In this embodiment and some other embodiments, the port signal transmission holes 104 are all located at the center between adjacent frequency tuning blind holes 103.

[0033] Exemplarily, the port signal transmission hole 104 and the frequency tuning blind hole 103 are both circular cavities. In some other embodiments, the port signal transmission hole 104 and the frequency tuning blind hole 103 may also be other shapes; the port signal transmission hole 104 is set at the center position between the adjacent frequency tuning blind holes 103, and the structure of the dielectric waveguide filter is relatively simple and stable, and it also has the characteristics of excellent consistency, etc., which further expands the application range of the dielectric waveguide filter.

[0034] Optionally, continue to refer to Figure 2 In this embodiment, the frequency tuning blind holes include eight frequency tuning blind holes 103, and the eight frequency tuning blind holes 103 are arranged in two rows and four columns; the isolation slots 102 include a first isolation slot 1021, a second isolation slot 1022 and a third isolation slot 1023; the first isolation slot 1021 is located between the first column of frequency tuning blind holes and the second column of frequency tuning blind holes, the second isolation slot 1022 is located between the second column of frequency tuning blind holes and the third column of frequency tuning blind holes, and the third isolation slot 1023 is located between the third column of frequency tuning blind holes and the fourth column of frequency tuning blind holes; at least two port signal transmission holes 104 include a first port signal transmission hole 1041 and a second port signal transmission hole 1042, the first port signal transmission hole 1041 is located between the first column of frequency tuning blind holes and the second column of frequency tuning blind holes, and the second port signal transmission hole is located between the third column of frequency tuning blind holes and the fourth column of frequency tuning blind holes.

[0035] Specifically, Figure 3 A signal flow diagram of a dielectric waveguide filter provided in an embodiment of the present invention, which may correspond to Figure 2 The dielectric waveguide filter in Figure 4 The S parameter curve result diagram of a dielectric waveguide filter provided by an embodiment of the present invention corresponds to Figure 2 The dielectric waveguide filter in Figures 2 to 4 , the plurality of frequency tuning blind holes may include a first frequency tuning blind hole 1031, a second frequency tuning blind hole 1032, a third frequency tuning blind hole 1033, a fourth frequency tuning blind hole 1034, a fifth frequency tuning blind hole 1035, a sixth frequency tuning blind hole 1036, a seventh frequency tuning blind hole 1037 and an eighth frequency tuning blind hole 1038; the first port signal transmission hole 1041 may be used as an input port, and the second frequency tuning blind hole 1042 may be used as an output port, such as Figure 3As shown, the signal inputted by the first port signal transmission hole 1041 is divided into two paths, one path of the signal is transmitted through the first frequency tuning blind hole 1031 and the second frequency tuning blind hole 1032 to generate a signal with a phase difference of -180 degrees with the signal inputted by the first port signal transmission hole 1041, i.e., a group of transmission zero points; the other path of the signal is transmitted to the second port signal transmission hole 1042 after passing through the third frequency tuning blind hole 1033, the fourth frequency tuning blind hole 1034, the fifth frequency tuning blind hole 1035 and the sixth frequency tuning blind hole 1036, and the signal inputted by the second port signal transmission hole 1042 will have one path transmitted to the eighth frequency tuning blind hole 1038 through the seventh frequency tuning blind hole 1037, thereby generating a signal with a phase difference of -180 degrees with the signal inputted by the second port signal transmission hole 1042, i.e., another group of transmission zero points; thereby, multiple transmission zero points are generated without setting a capacitive coupling column, the out-of-band suppression capability is improved, and the miniaturization of the dielectric waveguide filter can be realized. It should be noted that, in this embodiment, the first frequency tuning blind hole 1031 and the second frequency tuning blind hole 1032 can change the strength of the window coupling between the first frequency tuning blind hole 1031 and the second frequency tuning blind hole 1032 by adjusting their sizes, thereby adjusting the strength of the transmission zero point; at the same time, multiple frequency tuning blind holes can also be opened on the transmission path between the first port signal transmission hole 1041 and the second frequency tuning blind hole 1032, thereby forming a dielectric waveguide filter with other zero point numbers.

[0036] Optionally, continue to refer to Figure 2 The first isolation groove 1021 and the third isolation groove 1023 are in a "cross" shape, and the second isolation groove is in a "I" shape.

[0037] Such an arrangement can simplify the process difficulty of the dielectric waveguide filter and reduce the production cost of the dielectric waveguide filter.

[0038] Optionally, continue to refer to Figure 2 The first port signal transmission hole 1041 and the second port signal transmission hole 1042 are symmetrical about the center line of the eight frequency tuning blind holes.

[0039] Specifically, Figure 2 As shown, the eight frequency tuning blind holes and the two port signal transmission holes are symmetrical about the same center line 201. At this time, the dielectric waveguide filter can generate symmetrical transmission zero points.

[0040] Please also note that in the above description, the number of frequency tuning blind holes on the left side of the first port signal transmission hole 1041 is 2, and the number of frequency tuning blind holes on the right side of the second port signal transmission hole 1042 is 2, but this number is only for example. In other embodiments, this number can also be (2, 1), (2, 0), (1, 2), (1, 1), (1, 0), (0, 1), (0, 2)...etc.

[0041] Optionally, Figure 5 A schematic diagram of the structure of another dielectric waveguide filter provided in an embodiment of the present invention, referring to Figure 5 , the first isolation through groove 1021 is connected to the second isolation through groove 1022 .

[0042] In this way, the dielectric waveguide filter can generate asymmetric transmission zeros. The principle of transmission zero generation is similar to Figure 2 The transmission zero point generation principle of the dielectric waveguide filter shown in is similar and will not be repeated here. Since there is no need to use capacitive coupling columns to generate transmission zero points, the difficulty of subsequent optimization and debugging can be greatly reduced, the labor cost can be greatly reduced, and the miniaturization of the dielectric waveguide filter can be achieved, thereby expanding the application range of the dielectric waveguide filter.

[0043] Optionally, Figure 6 A schematic diagram of the structure of another dielectric waveguide filter provided by an embodiment of the present invention, Figure 7 A schematic diagram of the structure of another dielectric waveguide filter provided in an embodiment of the present invention, referring to Figure 6 and Figure 7 , a plurality of frequency tuning blind holes 103 are located in a straight line.

[0044] Specifically, in this embodiment, the frequency tuning blind holes can be arranged in a row. By setting the port signal transmission hole 104 and the frequency tuning blind hole 103 not to overlap, the input signal on the port signal transmission hole 104 will pass through the frequency tuning blind hole 103 to generate a signal with a phase difference of -180 degrees with the input signal, that is, a transmission zero point is generated. Since there is no need to use a capacitive coupling column to generate a transmission zero point, the difficulty of subsequent optimization and debugging can be greatly reduced, the labor cost can be greatly reduced, and the miniaturization of the dielectric waveguide filter can be achieved, expanding the application range of the dielectric waveguide filter. Figure 6 In the embodiment, the first port signal transmission hole 1041 and the second port signal transmission hole 1042 are symmetrical about the center line of the dielectric waveguide filter, and a symmetrical transmission zero point can be generated at this time; Figure 7 In the embodiment, the first port signal transmission hole 1041 and the second port signal transmission hole 1042 are not symmetrical about the center line of the dielectric waveguide filter, and an asymmetric transmission zero point may be generated.

[0045] Optionally, at least part of the frequency tuning blind holes and the port signal transmission holes are located on the same surface of the dielectric waveguide filter.

[0046] Specifically, the frequency tuning blind holes can be arranged on both sides of the dielectric waveguide filter, that is, frequency tuning blind holes in the form of blind holes are opened on both sides of the dielectric body, and at this time, the frequency tuning blind holes on the two sides of the dielectric body can be in relative positions, thereby improving the far-end suppression performance of the dielectric waveguide filter.

[0047] It should be noted that in some other embodiments, the dielectric body may be double-layered, and the location of the frequency tuning blind hole is well known to those skilled in the art, and will not be described in detail here. The dielectric waveguide filter of this embodiment can generate any number and any position of transmission zeros or symmetrical transmission zeros; all the frequency tuning blind holes are inductively cross-coupled, and the stability consistency is good; the cavity arrangement method is more flexible, that is, in-line, double-row or double-layer, and the structure is simple and stable; and the process difficulty is small, the production cost is low, the structural consistency is excellent, and the application range is wider.

[0048] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A dielectric waveguide filter, characterized in that: The dielectric waveguide filter comprises: A dielectric body, wherein a plurality of isolation slots and a plurality of frequency tuning blind holes are provided on the dielectric body; The medium body is also provided with at least two port signal transmission holes; The port signal transmission hole and at least part of the frequency tuning blind hole are located on two opposite sides of the dielectric body; and in the thickness direction of the dielectric body, the port signal transmission hole and the frequency tuning blind hole do not overlap; The plurality of frequency tuning blind holes include eight frequency tuning blind holes, and the eight frequency tuning blind holes are arranged in two rows and four columns; The isolation through grooves include a first isolation through groove, a second isolation through groove and a third isolation through groove; The first isolation through slot is located between the first column of frequency tuning blind holes and the second column of frequency tuning blind holes, the second isolation through slot is located between the second column of frequency tuning blind holes and the third column of frequency tuning blind holes, and the third isolation through slot is located between the third column of frequency tuning blind holes and the fourth column of frequency tuning blind holes; The at least two port signal transmission holes include a first port signal transmission hole and a second port signal transmission hole, the first port signal transmission hole is located between the first column of frequency tuning blind holes and the second column of frequency tuning blind holes, and the second port signal transmission hole is located between the third column of frequency tuning blind holes and the fourth column of frequency tuning blind holes.

2. The dielectric waveguide filter according to claim 1, characterized in that: There is no capacitive coupling window between the frequency tuning blind holes of the dielectric waveguide filter.

3. The dielectric waveguide filter according to claim 1, wherein: The frequency tuning blind holes are arranged on both the left and right sides of the port signal transmission hole.

4. The dielectric waveguide filter according to claim 3, characterized in that: At least one port signal transmission hole is located at a central position between two adjacent frequency tuning blind holes.

5. The dielectric waveguide filter according to claim 1, wherein: The first isolation through groove and the third isolation through groove are in a "X" shape, and the second isolation through groove is in a "I" shape.

6. The dielectric waveguide filter according to claim 5, characterized in that The first port signal transmission hole and the second port signal transmission hole are symmetrical about the center line of the eight frequency tuning blind holes.

7. The dielectric waveguide filter according to claim 5, characterized in that The first isolation through-groove is communicated with the second isolation through-groove.

8. The dielectric waveguide filter according to any one of claims 1 to 4, characterized in that: At least part of the frequency tuning blind holes and the port signal transmission holes are located on the same surface of the dielectric waveguide filter.

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