Dielectric waveguide filter
By setting isolation pass slots and frequency tuning blind holes on the dielectric body of the dielectric waveguide filter, and using port signal transmission holes to generate transmission zeros, the problem of difficulty in realizing multi-zero structures in the prior art is solved, and the miniaturization of the dielectric waveguide filter and the expansion of the application range are achieved.
Patent Information
- Application Number
- CN202510469505.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2020-04-16
- Publication Date
- 2025-06-17
AI Technical Summary
When implementing a multi-zero structure, existing dielectric waveguide filters need to be equipped with capacitive coupling columns or double-sided cavity, which leads to difficult post-commissioning, large size, and increased process difficulty, limiting their application scope.
By providing several isolation through grooves and frequency tuning blind holes on the medium body, and at least two port signal transmission holes are provided in the thickness direction of the medium body, the port signal transmission holes do not overlap with the frequency tuning blind holes, thereby generating a transmission zero without the need to use a capacitive coupling column.
It reduces the difficulty of post-commissioning optimization, reduces labor cost, realizes the miniaturization of dielectric waveguide filters, and expands its application range.
Smart Images
Figure CN120165208A_ABST
Abstract
Description
[0001] This invention patent application is a divisional application. The original application number is 202010298507.5, the application date is April 16, 2020, and the invention title is: Dielectric waveguide filter. Technical Field
[0002] Embodiments of the present invention relate to filter technology, and in particular, to a dielectric waveguide filter. Background Art
[0003] With the development of 5G communication, the application of dielectric waveguide filters is becoming more and more extensive, and correspondingly, the performance requirements for dielectric waveguide filters are also getting higher and higher.
[0004] In order to improve the out-of-band rejection ability of the dielectric waveguide filter, it is usually necessary to set the dielectric waveguide filter as a multi-zero structure; however, in the prior art, in order to achieve multiple zeros of the dielectric waveguide filter, it is usually necessary to set capacitive coupling posts or a double-sided cavity arrangement. However, the method based on capacitive coupling posts increases the difficulty of subsequent debugging of the dielectric waveguide filter; while the method based on the double-sided cavity arrangement makes the size of the dielectric waveguide filter larger, and the subsequent debugging and process difficulty increase, which limits the further application of the dielectric waveguide filter. Summary of the Invention
[0005] Embodiments of the present invention provide a dielectric waveguide filter to achieve the miniaturization of the dielectric waveguide filter and expand the application range of the dielectric waveguide filter.
[0006] In a first aspect, embodiments of the present invention provide a dielectric waveguide filter, which includes: a dielectric body, on which a plurality of isolation through slots and a plurality of frequency tuning blind holes are provided; at least two port signal transmission holes are also provided on the dielectric body; the port signal transmission holes and at least some of the frequency tuning blind holes are located on 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.
[0007] Optionally, there is no capacitive coupling window between the frequency tuning blind holes of the dielectric waveguide filter.
[0008] Optionally, the frequency tuning blind holes are provided on both the left and right sides of the port signal transmission hole.
[0009] Optionally, at least one port signal transmission hole is located at the center position between two adjacent frequency tuning blind holes.
[0010] Optionally, the several frequency tuning blind holes include eight frequency tuning blind holes, which 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.
[0011] Optionally, the first isolation through slot and the third isolation through slot are in a "cross" shape, and the second isolation through slot is in a "one" shape.
[0012] Optionally, the first port signal transmission hole and the second port signal transmission hole are symmetric about the center line of the eight frequency tuning blind holes.
[0013] Optionally, the first isolation through slot is communicated with the second isolation through slot.
[0014] Optionally, the several frequency tuning blind holes are located on a straight line.
[0015] Optionally, at least some of the frequency tuning blind holes and the port signal transmission holes are on the same side of the dielectric waveguide filter.
[0016] The technical solution of this embodiment adopts a dielectric waveguide filter including a dielectric body, on which several isolation through slots and several frequency tuning blind holes are provided; at least two port signal transmission holes are also provided on the dielectric body; the port signal transmission holes and at least some of the frequency tuning blind holes are on 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 generate a signal with a phase difference of -180 degrees from the input signal through the frequency tuning blind hole, that is, a transmission zero point is generated. Since there is no need to use capacitive coupling posts to generate the transmission zero point, the later debugging and optimization difficulty can be greatly reduced, the labor cost can be reduced, which is beneficial to the miniaturization of the dielectric waveguide filter and expands the application range of the dielectric waveguide filter. Description of the Drawings
[0017] Figure 1 It is a schematic structural diagram of a dielectric waveguide filter in the prior art;
[0018] Figure 2Schematic diagram of the structure of a dielectric waveguide filter provided by an embodiment of the present invention;
[0019] Figure 3 Schematic diagram of the signal flow of a dielectric waveguide filter provided by an embodiment of the present invention;
[0020] Figure 4 Result graph of the S-parameter curve of a dielectric waveguide filter provided by an embodiment of the present invention;
[0021] Figure 5 Schematic diagram of the structure of another dielectric waveguide filter provided by an embodiment of the present invention;
[0022] Figure 6 Schematic diagram of the structure of another dielectric waveguide filter provided by an embodiment of the present invention;
[0023] Figure 7 Schematic diagram of the structure of another dielectric waveguide filter provided by an embodiment of the present invention. Detailed implementation manners
[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.
[0025] Figure 1 Schematic diagram of the structure of a dielectric waveguide filter in the prior art, refer to 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 opposite sides of the dielectric body 101' and are opposite in position. If a transmission zero point needs to be generated, a capacitive coupling column 105' needs to be provided on the dielectric body 101' to form capacitive cross-coupling. However, the later debugging and optimization of the capacitive coupling column 105' are difficult, resulting in a high later production cost of the dielectric waveguide filter and limiting the application of the dielectric waveguide filter in 5G technology.
[0026] Based on the above technical problems, the present invention proposes the following solutions:
[0027] Figure 2 Schematic diagram of the structure of a dielectric waveguide filter provided by an embodiment of the present invention, refer to Figure 2, the 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 provided; at least two port signal transmission holes 104 are also provided on the dielectric body 101; the port signal transmission holes 104 and at least some of the frequency tuning blind holes 103 are located on 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.
[0028] Specifically, the dielectric body 101 can be a ceramic body, the frequency tuning blind holes 103 are blind holes opened on the dielectric body 101, and a metal shielding layer, such as a copper shielding layer, can be provided on the surface of the dielectric body 101; the port signal transmission holes 104 are blind holes opened on the dielectric body 101, and the port signal transmission holes 104 and at least some of the frequency tuning blind holes 103 are located on opposite sides of the dielectric body 101. For example, at least some of the frequency tuning blind holes 103 are opened on the front surface of the dielectric body 101, and the port signal transmission holes 104 are opened on the back surface of the dielectric body 101; the port signal transmission holes 104 serve as the input ports or output ports of the dielectric waveguide filter. In this embodiment, since 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. For example, after the signal is input by one of the port signal transmission holes 1041, the signal is transmitted in two directions. One path of the signal is transmitted to another port signal transmission hole 1042 through the frequency tuning blind holes (1033 - 1034 - 1035 - 1036), and the other path of the signal generates a signal with a phase difference of -180 degrees from the signal input by the port signal transmission hole 1041 after passing through the frequency tuning blind holes (1031 - 1032), that is, a set of transmission zeros is generated; it can be understood that there is also a path of the signal passing through the frequency tuning blind holes (1037 - 1038) at another port signal transmission hole 1042 to generate a signal with a phase difference of -180 degrees from the signal input by this frequency tuning blind hole 103, that is, another set of transmission zeros. For example, thus, the dielectric waveguide filter of this embodiment can generate multiple transmission zeros; since there is no need to use capacitive coupling posts, the difficulty of later optimization and debugging can be greatly reduced, the man-hour cost can be greatly reduced, and at the same time, the miniaturization of the dielectric waveguide filter can be realized, 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 the direction perpendicular to the surface of the dielectric body 101 where the frequency tuning blind holes 103 are provided. In this direction, the port signal transmission holes 104 and the frequency tuning blind holes 103 do not overlap, that is, the orthographic projection of the port signal transmission holes 104 in this direction does not overlap with the orthographic projection of the frequency tuning blind holes 103 in this direction.
[0029] In the technical solution of this embodiment, the dielectric waveguide filter adopted includes a dielectric body, on which a plurality of isolation through slots and a plurality of frequency tuning blind holes are provided; at least two port signal transmission holes are further provided on the dielectric body; the port signal transmission holes and at least part of the frequency tuning blind holes are located on 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 generate a signal with a phase difference of -180 degrees from the input signal through the frequency tuning blind hole, that is, a transmission zero point is generated. Since there is no need to use capacitive coupling posts to generate the transmission zero point, the difficulty of later optimization and debugging can be greatly reduced, the man-hour cost can be greatly reduced, and at the same time, the miniaturization of the dielectric waveguide filter can be realized and the application range of the dielectric waveguide filter can be expanded.
[0030] 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 capacitive coupling posts. All between the frequency tuning blind holes 103 of this embodiment are inductive cross-coupling modes, and their stability and consistency are better.
[0031] Optionally, continue to refer to Figure 2 , frequency tuning blind holes 103 are provided on both the left and right 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. Specifically, the position of the port signal transmission hole 104 between adjacent frequency tuning blind holes 103 can be adjusted according to 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.
[0032] With such an arrangement, it can be ensured that one path of the input signal of the port signal transmission hole 104 will generate a signal with a phase difference of -180 degrees from the input signal after passing through the frequency tuning blind hole 103, that is, it can be ensured that a transmission zero point is generated, and the out-of-band rejection ability of the dielectric waveguide filter is improved.
[0033] Continue to refer to Figure 2 , in this embodiment and some other embodiments, at least one port signal transmission hole 104 is located at the central position 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 central position between adjacent frequency tuning blind holes 103.
[0034] Exemplarily, both the port signal transmission hole 104 and the frequency tuning blind hole 103 are circular cavities. In some other embodiments, the port signal transmission hole 104 and the frequency tuning blind hole 103 can also be of other shapes. The port signal transmission hole 104 is arranged at the central position between the adjacent frequency tuning blind holes 103. The structure of the dielectric waveguide filter is relatively simple and stable, and at the same time, it also has excellent consistency and other characteristics, further expanding the application range of the dielectric waveguide filter.
[0035] 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 through slots 102 include a first isolation through slot 1021, a second isolation through slot 1022, and a third isolation through slot 1023. The first isolation through 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 through slot 1022 is located between the second column of frequency tuning blind holes and the third column of frequency tuning blind holes. The third isolation through 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. 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.
[0036] Specifically, Figure 3 is a signal flow schematic diagram of a dielectric waveguide filter provided by an embodiment of the present invention, which can correspond to the dielectric waveguide filter in Figure 2 , Figure 4 is an S-parameter curve result diagram of a dielectric waveguide filter provided by an embodiment of the present invention, which corresponds to the dielectric waveguide filter in Figure 2 , combined with Figures 2 to 4 , several frequency tuning blind holes can 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 can be used as an input port, and the second frequency tuning blind hole 1042 can be used as an output port, as shown in Figure 3As shown, the signal input through the first port signal transmission hole 1041 is divided into two paths. One path of the signal passes 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 from the signal input through the first port signal transmission hole 1041, that is, a set of transmission zeros. 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. There will be a path of the signal input through the second port signal transmission hole 1042 that is 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 from the signal input through the second port signal transmission hole 1042, that is, another set of transmission zeros. Thus, without the need to set capacitive coupling posts, multiple transmission zeros can be generated, improving the out-of-band rejection ability and enabling miniaturization of the dielectric waveguide filter. It should be noted that the size of the first frequency tuning blind hole 1031 and the second frequency tuning blind hole 1032 in this embodiment can be adjusted to change the strength of the window coupling between the first frequency tuning blind hole 1031 and the second frequency tuning blind hole 1032, and further adjust the strength of the transmission zeros. 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 numbers of zeros.
[0037] Optionally, continuing to refer to Figure 2 , the first isolation through slot 1021 and the third isolation through slot 1023 are in a "cross" shape, and the second isolation through slot is in a "one" shape.
[0038] With such a setting, the process difficulty of the dielectric waveguide filter can be simplified, and the production cost of the dielectric waveguide filter can be reduced.
[0039] Optionally, continuing to refer to Figure 2 , the first port signal transmission hole 1041 and the second port signal transmission hole 1042 are symmetric about the center line of the eight frequency tuning blind holes.
[0040] Specifically, as Figure 2 shown, the eight frequency tuning blind holes and the two port signal transmission holes are all symmetric about the same center line 201. At this time, the dielectric waveguide filter can generate symmetric transmission zeros.
[0041] It should also be noted 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. However, this number is only for illustrative purposes. In other embodiments, this number can also be (2, 1), (2, 0), (1, 2), (1, 1), (1, 0), (0, 1), (0, 2), etc.
[0042] Optionally, Figure 5 is a schematic structural diagram of another dielectric waveguide filter provided by an embodiment of the present invention. Refer to Figure 5 , the first isolation through slot 1021 communicates with the second isolation through slot 1022.
[0043] With this setting, the dielectric waveguide filter can generate asymmetric transmission zeros. The principle of generating its transmission zeros is similar to that of the dielectric waveguide filter shown in Figure 2 , which will not be elaborated here. Since there is no need to use capacitive coupling posts to generate transmission zeros, it can greatly reduce the difficulty of later optimization and debugging, significantly reduce the man-hour cost, and at the same time realize the miniaturization of the dielectric waveguide filter and expand the application range of the dielectric waveguide filter.
[0044] Optionally, Figure 6 is a schematic structural diagram of another dielectric waveguide filter provided by an embodiment of the present invention. Figure 7 is a schematic structural diagram of another dielectric waveguide filter provided by an embodiment of the present invention. Refer to Figure 6 and Figure 7 , several frequency tuning blind holes 103 are located on a straight line.
[0045] Specifically, in this embodiment, the frequency tuning blind holes can be arranged in a row. By setting the port signal transmission hole 104 not to overlap with the frequency tuning blind hole 103, 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 from the input signal, that is, a transmission zero is generated. Since there is no need to use capacitive coupling posts to generate transmission zeros, it can greatly reduce the difficulty of later optimization and debugging, significantly reduce the man-hour cost, and at the same time realize the miniaturization of the dielectric waveguide filter and expand the application range of the dielectric waveguide filter. In Figure 6 , the first port signal transmission hole 1041 and the second port signal transmission hole 1042 are symmetric about the center line of the dielectric waveguide filter. At this time, symmetric transmission zeros can be generated; in Figure 7 , the first port signal transmission hole 1041 and the second port signal transmission hole 1042 are not symmetric about the center line of the dielectric waveguide filter. At this time, asymmetric transmission zeros can be generated.
[0046] 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.
[0047] Specifically, the frequency tuning blind holes can be arranged on both surfaces of the dielectric waveguide filter, that is, blind holes in the form of frequency tuning blind holes are opened on both surfaces of the dielectric body, and at this time, the frequency tuning blind holes on both surfaces of the dielectric body can be in opposite positions, so as to improve the far-end rejection performance of the dielectric waveguide filter.
[0048] It should be noted that in some other embodiments, the dielectric body can be double-layered. At this time, the setting positions of the frequency tuning blind holes are well known to those skilled in the art and will not be elaborated here. The dielectric waveguide filter of this embodiment can generate transmission zeros or symmetric transmission zeros at any number and any position; all the frequency tuning blind holes are inductively cross-coupled, with good stability and consistency; the cavity arrangement is more flexible, that is, in-line, double-row or double-layer can be used, and the structure is simple and stable; moreover, the process difficulty is small, the production cost is low, the structural consistency is excellent, and the application range is wider.
[0049] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope 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. Without departing from the concept of the present invention, more other equivalent embodiments can be included, 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 includes: a dielectric body, on which a plurality of isolation through slots and a plurality of frequency tuning blind holes are provided; at least two port signal transmission holes are further provided on the dielectric body; the port signal transmission holes and at least some of the frequency tuning blind holes are located on 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 is configured such that there is no capacitive coupling window between the plurality of frequency tuning blind holes and all between the plurality of frequency tuning blind holes are inductive cross-couplings.
2. The dielectric waveguide filter according to claim 1, characterized in that, Frequency tuning blind holes are provided on both the left and right sides of the port signal transmission hole.
3. The dielectric waveguide filter according to claim 2, characterized in that, At least one port signal transmission hole is located at the central position between two adjacent frequency tuning blind holes thereof.
4. The dielectric waveguide filter according to any one of claims 1-3, characterized in that, 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.
5. The dielectric waveguide filter according to claim 4, characterized in that, The first isolation through slot and the third isolation through slot are in a "cross" shape, and the second isolation through slot is in a "one" 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 symmetric 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 slot and the second isolation through slot are connected.
8. The dielectric waveguide filter according to any one of claims 1-3, characterized in that, The plurality of frequency tuning blind holes are located on a straight line.
9. The dielectric waveguide filter according to any one of claims 1-3, characterized in that, At least some of the frequency tuning blind holes and the port signal transmission holes are on the same surface of the dielectric waveguide filter.
10. The dielectric waveguide filter according to claim 1, characterized in that, The cavity arrangement mode of the dielectric waveguide filter is double-row or double-layer.