Dielectric filter
By designing a dielectric filter containing multiple resonator groups and matching steps, the problem that multiple RF signals cannot be filtered simultaneously in the prior art is solved, and the simultaneous operation of multiple RF channel signals is realized, and the insertion loss and Power requirements.
Patent Information
- Application Number
- CN202421135402.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-23
AI Technical Summary
In the prior art, signals from multiple radio frequency channels in a communication device cannot be filtered by a single dielectric filter at the same time, and the increased insertion loss and power requirements are difficult to meet.
Design a dielectric filter, including a metal cavity, an input common cavity, an output common cavity and multiple resonator groups, the input end of each resonator group is coupled with the input common cavity signal, and the output end of each resonator group is The output common cavity signal is coupled, and a matching step and a first tuning through hole are provided in the input and output common cavity to achieve simultaneous filtering of multiple radio frequency signals.
Simultaneous filtering of multiple RF signals is realized, reducing debugging difficulty and meeting plug-in loss and power requirements.
Smart Images
Figure CN222483655U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to but are not limited to the field of communication technology, and in particular to a dielectric filter. Background Art
[0002] In the related art, communication equipment in a communication system often uses dual RF channels or more RF channels for signal transmission. At this time, in order to ensure the signal quality of the communication equipment, multiple independent dielectric filters are often used or the signals of the dual RF channels are filtered separately. However, the use of multiple independent dielectric filters will increase the insertion loss of the filter and reduce the power. If the signal quality needs to be improved, multiple RF channels need to work simultaneously, and the dielectric filters in the related art cannot achieve simultaneous filtering of multiple RF signals and meet the insertion loss and power requirements. Therefore, how to provide a dielectric filter that can achieve simultaneous filtering of multiple RF signals while meeting the insertion loss and power requirements is a technical problem that needs to be solved urgently. Utility Model Content
[0003] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of protection of the claims. The embodiments of the present application provide a dielectric filter that can filter multiple radio frequency signals simultaneously while meeting insertion loss and power requirements.
[0004] The dielectric filter proposed in the embodiment of the present application includes:
[0005] A metal cavity, wherein an input common cavity, an output common cavity and a plurality of resonator groups are provided in the metal cavity; each resonator group supports different frequencies, the input end of each resonator group is coupled with the input common cavity signal, the output end of each resonator group is coupled with the output common cavity signal, and the input common cavity and the output common cavity are both provided with matching steps and a first tuning through hole.
[0006] Therefore, the above-mentioned embodiments of the present application have at least the following beneficial effects: by coupling the input ends of multiple resonator groups to an input common cavity, and coupling the output ends of multiple resonator groups to an output common cavity, signals of different frequency bands can simultaneously enter the dielectric filter for filtering and output, thereby realizing the simultaneous operation of multiple RF channel signals. And by setting matching steps in both the input common cavity and the output common cavity, the mutual influence between adjacent resonator groups can be reduced, and by adding a first tuning through hole to compensate for the input and output coupling reduced by the matching step, the difficulty of debugging can be reduced while realizing the simultaneous filtering of multiple RF signals and meeting the insertion loss and power requirements.
[0007] According to some embodiments of the present application, the matching step of the input common cavity includes a first matching step, which is used to divide the input common cavity into two interconnected sub-input cavities, each of which is coupled to the input end signal of at least one resonator group; and first coupling ribs are provided on adjacent side walls of the two sub-input cavities.
[0008] According to some embodiments of the present application, two first tuning through holes of the input common cavity are provided, and the two first tuning through holes of the input common cavity are located on the first side wall of the metal cavity, and the two first tuning through holes of the input common cavity are respectively located on the side walls of the sub-input cavity adjacent to the first matching step.
[0009] According to some embodiments of the present application, the dielectric filter also includes a cover plate, which is provided with an output port connected to the output common cavity, the input common cavity is a cavity with openings at both ends, the input common cavity is opened on one side away from the cover plate to form an input port, and the first matching step is arranged close to the cover plate.
[0010] According to some embodiments of the present application, the matching step of the output common cavity includes a second matching step, both ends of the second matching step are respectively connected to two second side walls opposite to the output common cavity, and the second matching step is used to divide the output common cavity into two interconnected sub-output cavities, each sub-output cavity is coupled with the output end signal of at least one resonator group; second coupling ribs are arranged in both of the sub-output cavities, and the second coupling ribs are arranged close to the resonator group for signal coupling.
[0011] According to some embodiments of the present application, the two first tuning through holes of the output common cavity are respectively arranged in the two sub-output cavities in a one-to-one correspondence, and the first tuning through holes of the output common cavity are arranged opposite to the second coupling ribs of the same sub-output cavity.
[0012] According to some embodiments of the present application, each of the resonator groups is composed of a plurality of resonators whose signals are coupled to each other, and a coupling step is provided between two adjacent resonators in the same resonator group.
[0013] According to some embodiments of the present application, a coupling metal sheet is arranged between at least two resonators arranged at intervals in the same resonator group.
[0014] According to some embodiments of the present application, the dielectric filter further comprises a cover plate, on which a second tuning through hole corresponding one to one with each resonator in the resonator group is formed, and the cover plate is covered on the metal cavity and is detachably connected to the metal cavity.
[0015] According to some embodiments of the present application, there are two resonator groups, the two resonator groups are arranged opposite to each other, and the resonators of the resonator groups are distributed along the circumference of the metal cavity. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.
[0017] Figure 1 It is a structural schematic diagram of an embodiment of the dielectric filter provided by the present application (excluding the cover plate);
[0018] Figure 2 yes Figure 1 An enlarged schematic diagram of a part A of the embodiment shown;
[0019] Figure 3 yes Figure 1 A cross-sectional schematic diagram of a dielectric filter shown;
[0020] Figure 4 yes Figure 3 An enlarged schematic diagram of a part B of the dielectric filter shown;
[0021] Figure 5 yes Figure 3 An enlarged schematic diagram of a local portion C of the dielectric filter shown;
[0022] Figure 6 yes Figure 1 A schematic structural diagram of the dielectric filter from another perspective;
[0023] Figure 7 It is a structural schematic diagram of an embodiment of the dielectric filter provided in the present application (including a cover plate).
[0024] Reference numerals:
[0025] The metal cavity 100, the input common cavity 110, the output common cavity 120, the second side wall 121, the mounting groove 130, the first side wall 140,
[0026] Resonator 210, resonant cavity 220, coupling step 230, coupling metal sheet 240,
[0027] matching step 310, first tuning through hole 320, first matching step 330, first coupling rib 340, second matching step 350, second coupling rib 360,
[0028] Cover plate 400 , output port 410 , and second tuning through hole 420 . DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art belonging to the technical field of the present application. The terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application. The terms "first", "second", "third", "fourth", etc. (if present) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order.
[0031] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.
[0032] Reference Figures 1 to 7 As shown, the dielectric filter proposed in the embodiment of the present application includes:
[0033] A metal cavity 100 is provided with an input common cavity 110, an output common cavity 120 and a plurality of resonator groups; each resonator group supports different frequencies, the input end of each resonator group is coupled with the input common cavity 110 signal, the output end of each resonator group is coupled with the output common cavity 120 signal, and the input common cavity 110 and the output common cavity 120 are both provided with a matching step 310 and a first tuning through hole 320.
[0034] Therefore, by coupling the input ends of multiple resonator groups to an input common cavity 110, and coupling the output ends of multiple resonator groups to an output common cavity 120, signals of different frequency bands can simultaneously enter the dielectric filter for filtering and output, thereby realizing the simultaneous operation of multiple RF channel signals. In addition, by setting matching steps 310 in both the input common cavity 110 and the output common cavity 120, the mutual influence between adjacent resonator groups can be reduced, and by adding the first tuning through hole 320 to compensate for the input and output coupling reduced by the matching step 310, the difficulty of debugging can be reduced while realizing the simultaneous filtering of multiple RF signals and meeting the insertion loss and power requirements.
[0035] It should be noted that the embodiment of the present application does not limit the outer contour shape and size of the metal cavity 100, and those skilled in the art can selectively set them according to actual needs.
[0036] It should be noted that the embodiment of the present application does not limit the number of resonators 210 in each resonator group. Those skilled in the art can selectively set it according to actual needs, and there is no limit on the number of resonator groups. For example, two groups of resonator groups are set, the input common cavity 110 and the output common cavity 120 are arranged opposite to each other, and the two groups of resonator groups are respectively located on both sides of the input common cavity 110 and the output common cavity 120.
[0037] It should be noted that, in some embodiments, the resonator 210 is a dielectric resonator 210, and a plurality of resonant cavities 220 for accommodating the resonators 210 are further provided in the metal cavity 100; the resonators 210 in each resonator group are located in a resonant cavity. The embodiment of the present application does not limit the type and shape of the resonator 210, and those skilled in the art can selectively set it according to actual needs.
[0038] It should be noted that the matching step 310 is used to control the coupling strength of the input or output of multiple frequency bands. The higher the height and the wider the width of the matching step 310, the weaker the coupling strength and the smaller the mutual influence between the frequency bands. Therefore, the embodiment of the present application can determine the size (such as height and width) of the matching step 310 in the corresponding input common cavity 110 and output common cavity 120 according to the frequency range and bandwidth size of each resonator group.
[0039] It should be noted that the position of the matching step 310 can be selectively set according to actual needs, such as the matching step 310 is set at the center position of the corresponding input common cavity 110 and the output common cavity 120 .
[0040] It should be noted that the embodiment of the present application does not limit the number and position of the first tuning through holes 320 , and the first tuning through holes 320 are used to allow the tuning rods to penetrate into the corresponding common cavity for coupling compensation.
[0041] Understandably, referring to Figure 1 to Figure 2 As shown, the matching step 310 of the input common cavity 110 includes a first matching step 330, and the first matching step 330 is used to divide the input common cavity 110 into two interconnected sub-input cavities, each of which is coupled to the input end signal of at least one resonator group; and first coupling ribs 340 are provided on adjacent side walls of the two sub-input cavities.
[0042] It should be noted that the embodiment of the present application does not limit the number and position of the first coupling ribs 340, and those skilled in the art can selectively set them according to actual needs.
[0043] It should be noted that the first coupling rib 340 is used to enhance the coupling to the resonator group output. In some embodiments, the first coupling rib 340 is placed horizontally to form a transverse coupling rib. Figure 2 As shown, each sub-input cavity is provided with two first coupling ribs 340 , and the two first coupling ribs 340 of the same sub-input cavity are arranged opposite to each other and are arranged near the side wall of the connection point of the two sub-input cavities.
[0044] It is understandable that two first tuning through holes 320 are provided in the input common cavity 110, and the two first tuning through holes 320 of the input common cavity 110 are located on the first side wall 140 of the metal cavity 100, and the two first tuning through holes 320 of the input common cavity 110 are respectively located on the side walls of the sub-input cavity adjacent to the first matching step 330.
[0045] By providing the first tuning through hole 320 in each sub-input cavity, compensation coupling can be performed separately, and adjustment is more convenient, thereby further improving signal quality.
[0046] Understandably, referring to Figure 6 and 7 As shown, the dielectric filter also includes a cover plate 400, on which an output port 410 connected to the output common cavity 120 is opened. The input common cavity 110 is a cavity with openings at both ends. The input common cavity 110 is opened on one side away from the cover plate 400 to form an input port, and the first matching step 330 is arranged close to the cover plate 400.
[0047] Through the above arrangement, the input and output of the dielectric filter are respectively located on two opposite side walls of the metal cavity 100 .
[0048] Understandably, referring to Figure 3 and Figure 5 As shown, the matching step 310 of the output common cavity 120 includes a second matching step 350, and the two ends of the second matching step 350 are respectively connected to the two second side walls 121 opposite to the output common cavity 120, and the second matching step 350 is used to divide the output common cavity 120 into two interconnected sub-output cavities, and each sub-output cavity is coupled with the output end signal of at least one resonator group; second coupling ribs 360 are arranged in both sub-output cavities, and the second coupling ribs 360 are arranged close to the resonator group for signal coupling.
[0049] It should be noted that the second matching step 350 is used to control the coupling strength of the outputs of multiple frequency bands. In some embodiments, the second matching step 350 is located in the middle of the output common cavity 120. For example, Figure 5As shown, two ends of the second matching step 350 are respectively connected to two second side walls 121 opposite to the output common cavity 120 to divide the output common cavity 120 into two interconnected sub-output cavities.
[0050] It should be noted that the resonator groups coupled to each sub-output cavity are different.
[0051] It should be noted that if Figure 1 and Figure 5 As shown, the output common cavity 120 is a cavity opened toward the cover plate 400, the second matching step 350 is located on the third side wall of the output common cavity 120 opposite to the cover plate 400, and the two ends of the second matching step 350 are respectively connected to the two second side walls 121. The height and width of the second matching step 350 can be selectively set according to actual needs.
[0052] It should be noted that the second coupling rib 360 is used to control the output coupling strength of the output frequency band. Figure 5 As shown, one end of the second coupling rib 360 is connected to a second side wall 121 of the output common cavity 120 .
[0053] It is understandable that there are two first tuning through holes 320 in the output common cavity 120, and the two first tuning through holes 320 in the output common cavity 120 are respectively arranged in the two sub-output cavities in a one-to-one correspondence, and the first tuning through holes 320 in the output common cavity 120 are arranged opposite to the second coupling ribs 360 of the same sub-output cavity.
[0054] It is understandable that each resonator group is composed of a plurality of resonators whose signals are coupled to each other, and a coupling step 230 is provided between two adjacent resonators 210 in the same resonator group.
[0055] It should be noted that the coupling step 230 determines the coupling amount between two adjacent resonators 210. The higher the coupling step 230 is, the weaker the coupling between two adjacent resonators 210 is. Therefore, those skilled in the art can selectively set the size of the coupling step 230 according to actual coupling amount requirements.
[0056] It is understandable that if Figure 1 As shown, a coupling metal sheet 240 is disposed between at least two resonators 210 disposed at intervals in the same resonator group.
[0057] It should be noted that the coupling metal sheet 240 is used to achieve cross coupling. The amount of cross coupling can be adjusted by adjusting the distance between the two cross-coupled resonators 210 and the coupling metal sheet 240. The closer the distance between the coupling metal sheet 240 and the cross-coupled resonator 210, the stronger the cross coupling, and vice versa.
[0058] For example, Figure 1 and Figure 3 As shown, each resonator group is provided with 7 resonators 210. For the resonator group on the left, the third resonator 210 and the fifth resonator 210 from the input common cavity 110 to the output common cavity 120 are cross-coupled. At this time, an installation groove 130 connecting the cavity where the third resonator 210 and the fifth resonator 210 are located is opened in the metal cavity 100, and the coupling metal sheet 240 is installed in the installation groove 130.
[0059] It is understandable that if Figure 7 As shown, the dielectric filter further comprises a cover plate 400 , on which second tuning through holes 420 corresponding to the resonators 210 in the resonator group are opened. The cover plate 400 is covered on the metal cavity 100 and is detachably connected to the metal cavity 100 .
[0060] The corresponding resonator 210 can be tuned by inserting a tuning rod into the second tuning hole 420. The depth of the tuning rod in the second tuning hole can adjust the frequency of the resonant cavity where the corresponding resonator 210 is located. The deeper the depth, the higher the frequency, and vice versa.
[0061] It is understandable that if Figure 1 As shown, there are two resonator groups, which are arranged opposite to each other, and the resonators 210 of the resonator groups are distributed along the circumference of the metal cavity 100 .
[0062] Therefore, after the input common cavity 110 connected to the two filter groups is split at the input end through the matching step 310 and the adjustment rod entering the first tuning through hole 320, it is combined again through the matching step 310 and the adjustment rod entering the first tuning through hole 320 in the output common cavity 120 through the cavity coupling to form a complete dual-frequency dielectric loaded filter. At this time, by adding the first tuning through hole 320 and the matching step 310 to both the input common cavity 110 and the output common cavity 120, the mutual influence between the resonator groups can be reduced, and the overall debugging difficulty is reduced. When the resonators 210 are all dielectric resonators 210, the performance of the overall filter can be further improved.
[0063] For example, refer to Figures 1 to 7As shown, the dielectric filter includes a metal cavity 100, a cover plate 400 and two groups of resonator groups arranged in the metal cavity 100. The input signal is respectively input to the input ends of the two groups of resonator groups through the input common cavity 110 of the metal cavity 100; the output ends of the two groups of resonator groups output the filtered signals through the output common cavity 120 of the metal cavity 100. The cover plate 400 is provided with second tuning through holes 420 corresponding to the resonators 210 in the resonator group. Each group of resonator groups is composed of 7 resonators, and the resonant cavities where each resonator 210 is located are interconnected, and the resonator 210 is a dielectric resonator 210. The resonator 210 is fixed in the corresponding resonant cavity by adhesive. As shown Figure 1 As shown, a coupling step 230 is provided between two adjacent resonators 210 of the same resonator group, and the coupling step 230 is located at the connection between two adjacent resonant cavities. At this time, the frequency in each resonant cavity is adjusted by the tuning rod passing through the second tuning through hole 420. Figure 1 As shown, in the transmission direction from the input common cavity 110 to the output common cavity 120, the resonant cavity 220 where the third resonator 210 is located and the resonant cavity 220 of the fifth resonator 210 are provided with a coupling metal sheet 240 to achieve cross coupling.
[0064] like Figure 2 As shown, the input common cavity 110 is provided with a first matching step 330 and two first coupling ribs 340 are provided on the side walls on both sides of the first matching step 330 , and the two first coupling ribs 340 of the same sub-input cavity are arranged opposite to each other.
[0065] like Figure 3 As shown, the output common cavity 120 is provided with a second matching step 350 and second coupling ribs 360 on both sides of the second matching step 350 .
[0066] like Figure 4 As shown, the first tuning through hole 320 of the input common cavity 110 and the first tuning through hole 320 of the output common cavity 120 are both opened on the first side wall 140 of the metal cavity 100, and the first tuning through hole 320 of the input common cavity 110 is arranged adjacent to the first coupling rib 340. The first tuning through hole 320 of the output common cavity 120 is arranged opposite to the second coupling rib 360.
[0067] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.
Claims
1. A dielectric filter, characterized in that: include: A metal cavity, wherein an input common cavity, an output common cavity and a plurality of resonator groups are provided in the metal cavity; each resonator group supports different frequencies, the input end of each resonator group is coupled with the input common cavity signal, the output end of each resonator group is coupled with the output common cavity signal, and the input common cavity and the output common cavity are both provided with matching steps and a first tuning through hole.
2. The dielectric filter according to claim 1, characterized in that: The matching step of the input common cavity includes a first matching step, which is used to divide the input common cavity into two interconnected sub-input cavities, each of which is coupled to the input end signal of at least one resonator group; and first coupling ribs are provided on adjacent side walls of the two sub-input cavities.
3. The dielectric filter according to claim 2, characterized in that: The input common cavity is provided with two first tuning through holes, which are located on the first side wall of the metal cavity and are respectively located on the side walls of the sub-input cavity adjacent to the first matching step.
4. The dielectric filter according to claim 2, characterized in that: The dielectric filter also includes a cover plate, which is provided with an output port connected to the output common cavity. The input common cavity is a cavity with openings at both ends. The input common cavity is opened on one side away from the cover plate to form an input port, and the first matching step is arranged close to the cover plate.
5. The dielectric filter according to claim 1, characterized in that: The matching step of the output common cavity includes a second matching step, both ends of which are respectively connected to two second side walls opposite to the output common cavity, and the second matching step is used to divide the output common cavity into two interconnected sub-output cavities, each sub-output cavity is coupled with the output end signal of at least one resonator group; second coupling ribs are arranged in both of the sub-output cavities, and the second coupling ribs are arranged close to the resonator group for signal coupling.
6. The dielectric filter according to claim 4, characterized in that: The two first tuning through holes of the output common cavity are respectively arranged in the two sub-output cavities in a one-to-one correspondence, and the first tuning through hole of the output common cavity is arranged opposite to the second coupling rib of the same sub-output cavity.
7. The dielectric filter according to any one of claims 1 to 6, characterized in that: Each of the resonator groups is composed of a plurality of resonators whose signals are coupled to each other, and a coupling step is arranged between two adjacent resonators in the same resonator group.
8. The dielectric filter according to claim 7, characterized in that: A coupling metal sheet is arranged between at least two resonators arranged at intervals in the same resonator group.
9. The dielectric filter according to claim 1, characterized in that The dielectric filter further comprises a cover plate, on which second tuning through holes corresponding to the resonators in the resonator group are formed, and the cover plate is covered on the metal cavity and detachably connected to the metal cavity.
10. The dielectric filter according to claim 1, characterized in that There are two resonator groups, which are arranged opposite to each other, and the resonators of the resonator groups are distributed along the circumference of the metal cavity.