Filter and filter assembly having the same

Abstract

This invention provides a filter and a filter assembly having the same. The filter includes: a rectangular dielectric block having a TE... 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Resonant mode, TE 102 Resonant mode and TE 201 The resonant modes are degenerate modes; the tuning structure, at least part of which is located within a rectangular dielectric block, is used to tune the TE. 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d The resonant modes are perturbated and coupled; the excitation structure, at least part of which is disposed within a rectangular dielectric block, comprises at least two excitation structures, with at least one excitation structure serving as the input and at least another as the output. This invention effectively solves the problem of the large size of existing multimode filters.

Description

Technical Field

[0001] This invention relates to the field of filter technology, and more specifically, to a filter and a filter assembly having the same. Background Technology

[0002] At present, filters have been widely used in electronic equipment such as aviation, aerospace, radar, communication, and electronic countermeasures, and have good frequency selection filtering function. In the existing technology, there are many theoretical design methods for filters, including classic models such as Butterworth Filter, Elliptic-Function Filter and Chebyshev Filter. The coupling matrix method proposed by AEAtia and AEWilliams in the 1970s[1]-[5] is based on resonant circuits and combined with the coupling characteristics between resonant modes to synthesize the coupling matrix of the filter, and then carry out physical structure design. The coupling matrix method has been widely used in engineering, and the cavity filter is a typical example.

[0003] However, traditional multimode filters typically achieve their filtering function by coupling multiple coaxial resonant cavities, i.e., a multi-cavity multimode structure. This structure is bulky and not suitable for various electronic devices designed for miniaturization. Summary of the Invention

[0004] The main objective of this invention is to provide a filter and a filter assembly having the same, in order to solve the problem of the large size of multimode filters in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a filter is provided, comprising: a rectangular dielectric block having a TE102 resonant mode, a TE201 resonant mode, a TE202 resonant mode, and a TEd0d resonant mode, wherein the TE102 resonant mode and the TE201 resonant mode are degenerate modes; a tuning structure, at least a portion of which is disposed within the rectangular dielectric block, the tuning structure being used to perturb and couple the TE102 resonant mode, the TE201 resonant mode, the TE202 resonant mode, and the TEd0d resonant mode; and an excitation structure, at least a portion of which is disposed within the rectangular dielectric block, wherein there are at least two excitation structures, at least one of which is an input terminal and at least another excitation structure is an output terminal.

[0006] Furthermore, the filter also includes: a rectangular housing having a rectangular cavity filled with a dielectric to form a rectangular dielectric block.

[0007] Furthermore, at least a portion of the rectangular shell is made of metallic material.

[0008] Furthermore, at least a portion of the tuning structure coincides with the geometric center of the rectangular dielectric block.

[0009] Furthermore, at least part of the tuning structure is made of metallic material.

[0010] Furthermore, the tuning structure is arranged in a cylindrical or prismatic shape, the excitation structure is a probe, and the central axis of the tuning structure is arranged parallel to the central axis of the excitation structure; or, the central axis of the tuning structure and the central axis of the excitation structure are arranged at an angle.

[0011] Furthermore, there are two excitation structures, which are located on both sides of the tuning structure.

[0012] Furthermore, the rectangular dielectric block has a receiving through hole for accommodating the excitation structure.

[0013] Furthermore, the rectangular shell has a through hole that communicates with the receiving through hole and is used for the excitation structure to pass through.

[0014] According to another aspect of the present invention, a filter assembly is provided, the filter assembly including at least two filters and an exciter. In two adjacent filters, a receiving via of one filter is coaxially disposed with a receiving via of another filter to form a connecting via. The exciter passes through the connecting via, and the portion of the exciter located within the receiving via forms an excitation structure of the filter corresponding to the receiving via. In the filters located at both ends, the excitation structures of the two filters located outside the connecting via respectively form an input terminal and an output terminal; wherein the filters are the filters described above.

[0015] Applying the technical solution of this invention, the rectangular dielectric block of the filter has TE 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Resonant mode, TE 102 Resonant mode and TE 201 The resonant modes are degenerate, and at least part of the tuning structure is located within a rectangular dielectric block for use with TE. 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Perturbation coupling is achieved between resonant modes. At least part of the excitation structure is located within a rectangular dielectric block, with at least two excitation structures, at least one serving as the input and at least the other as the output. Thus, the filter in this application is actually a single-cavity four-mode filter, achieved through the design of the rectangular dielectric block and the special selection of the resonant modes (i.e., TE). 102 Resonant mode, TE 201Resonant mode, TE 202 Resonance mode and TE d0d Resonant mode, TE 102 Resonant mode and TE 201 The resonant modes are degenerate, allowing a single tuning structure to perturb and couple all four resonant modes. Compared to existing multi-cavity multi-mode filters, the filter structure in this application is simpler and smaller, thus solving the problem of large size in existing multi-mode filters. Furthermore, the TE selected in this application... d0d Higher-order modes are beneficial for widening the passband bandwidth, resulting in better filtering performance of the filter. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the filter according to the present invention is shown;

[0018] Figure 2 It shows Figure 1 A schematic diagram of the internal structure of the filter in the image;

[0019] Figure 3 It shows Figure 1 A side view of the internal structure of the filter in the diagram;

[0020] Figure 4 It shows Figure 1 TE of the filter in 102 Internal magnetic field distribution diagram of the resonant mode;

[0021] Figure 5 It shows Figure 1 TE of the filter in 201 Internal magnetic field distribution diagram of the resonant mode;

[0022] Figure 6 It shows Figure 1 TE of the filter in 202 Internal magnetic field distribution diagram of the resonant mode;

[0023] Figure 7 It shows Figure 1 TE of the filter in d0d Internal magnetic field distribution diagram of the resonant mode;

[0024] Figure 8 It shows Figure 1 TE of the filter in 102 Front view of the internal electric field distribution in the resonant mode;

[0025] Figure 9 It shows Figure 1 TE of the filter in 102 Side view of the internal electric field distribution in the resonant mode;

[0026] Figure 10 It shows Figure 1 TE of the filter in 201 Resonant mode and TE 202 A graph showing the coupling relationship between the relative coupling bandwidth between resonant modes and the radius R of the tuning structure.

[0027] Figure 11 It shows Figure 1 TE of the filter in 201 Resonant mode and TE d0d A graph showing the coupling relationship between the relative coupling bandwidth between resonant modes and the radius R of the tuning structure.

[0028] Figure 12 It shows Figure 1 TE of the filter in 202 Resonant mode and TE d0d A graph showing the coupling relationship between the relative coupling bandwidth between resonant modes and the radius R of the tuning structure.

[0029] Figure 13 It shows Figure 1 The frequency response curve of the filter's S-parameters in the diagram;

[0030] Figure 14 A schematic diagram of the internal structure of a filter assembly according to an embodiment of the present invention is shown when there are two filters.

[0031] Figure 15 It shows Figure 13 This is a schematic diagram of the internal structure of the filter component when there are three filters.

[0032] Figure 16 It shows Figure 13 The S-parameter frequency response curves of the cascaded filter components in the diagram.

[0033] The above figures include the following reference numerals:

[0034] 10. Tuning structure; 20. Excitation structure; 30. Rectangular housing; 31. Receiving through hole; 40. Excitation element; 51. TE 102 Internal magnetic field distribution diagram of the resonant mode; 52, TE 201 Internal magnetic field distribution diagram of the resonant mode; 53, TE 202 Internal magnetic field distribution diagram of the resonant mode; 54, TE d0dInternal magnetic field distribution diagram of the resonant mode; 55, TE 102 Front view of the internal electric field distribution in the resonant mode; 56, TE 102 Side view of the internal electric field distribution of the resonant mode; 57. Coupling relationship diagram between the relative coupling bandwidth between the TE201 and TE202 resonant modes and the radius R of the tuning structure; 58. Coupling relationship diagram between the relative coupling bandwidth between the TE201 and TEd0d resonant modes and the radius R of the tuning structure; 59. Coupling relationship diagram between the relative coupling bandwidth between the TE202 and TEd0d resonant modes and the radius R of the tuning structure; 60. Frequency response curve of the filter S-parameters; 61. Frequency response curve of the cascaded filter S-parameters. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0037] In this invention, unless otherwise stated, directional terms such as "up" and "down" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0038] To address the issue of the large size of existing multimode filters, this application provides a filter and a filter assembly having the same.

[0039] like Figures 1 to 13 As shown, the filter includes a rectangular dielectric block, a tuning structure 10, and an excitation structure 20. The rectangular dielectric block has a TE 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Resonant mode, TE 102 Resonant mode and TE 201 The resonant modes are degenerate. At least part of the tuning structure 10 is disposed within the rectangular dielectric block, and the tuning structure 10 is used for TE. 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0dPerturbation coupling is performed between resonant modes; at least part of the excitation structure 20 is disposed within the rectangular dielectric block, and there are at least two excitation structures 20, at least one of which is an input terminal and at least the other is an output terminal.

[0040] Applying the technical solution of this embodiment, the rectangular dielectric block of the filter has TE 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Resonant mode, TE 102 Resonant mode and TE 201 The resonant modes are degenerate, and at least part of the tuning structure 10 is disposed within a rectangular dielectric block for use with TE. 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Perturbation coupling is performed between resonant modes. At least part of the excitation structure 20 is disposed within the rectangular dielectric block. There are at least two excitation structures 20, with at least one excitation structure 20 serving as the input and at least another excitation structure 20 serving as the output. Thus, the filter in this embodiment is actually a single-cavity four-mode filter, achieved through the design of the rectangular dielectric block and the special selection of the resonant modes (i.e., TE). 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Resonant mode, TE 102 Resonant mode and TE 201 The resonant modes are degenerate, allowing a single tuning structure 10 to perturb and couple the four resonant modes. Compared to existing multi-cavity multi-mode filters, the filter structure in this embodiment is simpler and smaller, thus solving the problem of large size in existing multi-mode filters. Furthermore, the TE selected in this embodiment... d0d Higher-order modes are beneficial for widening the passband bandwidth, resulting in better filtering performance of the filter.

[0041] Specifically, the single-cavity quad-mode filter in this embodiment also has advantages such as high Q value, low insertion loss, and large bandwidth.

[0042] like Figures 1 to 3 As shown, the filter also includes a rectangular housing 30, which has a rectangular cavity filled with a dielectric material to form a rectangular dielectric block.

[0043] Optionally, the medium filling the rectangular cavity can be air or other media.

[0044] Optionally, at least a portion of the rectangular housing 30 is made of a metallic material.

[0045] In this embodiment, the rectangular housing 30 is made entirely of metal.

[0046] Optionally, at least a portion of the tuning structure 10 coincides with the geometric center of the rectangular dielectric block. This arrangement ensures high disturbance and coupling reliability for the tuning structure 10 while allowing for more flexible and diverse placement to adapt to different operating conditions and usage requirements.

[0047] In this embodiment, the tuning structure 10 is located at the geometric center of the rectangular dielectric block to ensure that the location of the tuning structure 10 matches the structure of the rectangular dielectric block, thereby ensuring the optimal reliability of the disturbance coupling of the tuning structure 10.

[0048] like Figures 4 to 9 As shown, it respectively shows TE 102 Figure 51 shows the internal magnetic field distribution of the resonant mode. 201 Figure 52 shows the internal magnetic field distribution of the resonant mode, TE. 202 Figure 53 shows the internal magnetic field distribution of the resonant mode, TE. d0d Figure 54 shows the internal magnetic field distribution of the resonant mode. 102 Front view of the internal electric field distribution of the resonant mode 55 and TE 102 Side view of the internal electric field distribution in the resonant mode 56 (TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Electric field distribution diagram of resonant mode and TE 102 (The resonance modes are similar and will not be described in detail here.) As can be seen from the above schematic diagram, the magnetic fields of the four resonance modes selected in this embodiment are all set around the geometric center point of the rectangular dielectric block. Therefore, setting the tuning structure 10 at the geometric center of the rectangular dielectric block is beneficial for it to simultaneously disturb the four tuning modes, so as to realize its synchronous coupling control of the four tuning modes.

[0049] In this embodiment, at least a portion of the tuning structure 10 is made of a metallic material. This arrangement ensures that the tuning structure 10 has higher disturbance coupling performance, thereby improving the reliability of its synchronous coupling control for the four tuning modes.

[0050] In this embodiment, the tuning structure 10 is cylindrical or prismatic, and the excitation structure 20 is a probe. The central axis of the tuning structure 10 is parallel to the central axis of the excitation structure 20; alternatively, the central axis of the tuning structure 10 and the central axis of the excitation structure 20 are at an angle. This arrangement ensures that the orientations of the tuning structure 10 and the excitation structure 20 are matched (i.e., both are perpendicular to the magnetic field of the tuning mode and parallel to each other), further improving the coupling control reliability of the tuning structure 10 and thus enhancing the filtering performance of the filter. Simultaneously, this arrangement also makes the structure of the tuning structure 10 more flexible and diverse, improving the processing flexibility for operators.

[0051] In this embodiment, the central axis of the tuning structure 10 is set parallel to the central axis of the excitation structure 20.

[0052] In this embodiment, the tuning structure 10 is cylindrical to ensure a more uniform distance consistency between the outer peripheral surface of the tuning structure 10 and the outer peripheral surface of the rectangular dielectric block.

[0053] In this embodiment, the tuning structure 10 is arranged along the height direction of the rectangular medium block.

[0054] In this embodiment, the radius of the cylindrical tuning structure 10 is R.

[0055] In this embodiment, there are two excitation structures 20, located on opposite sides of the tuning structure 10. This arrangement of the two excitation structures 20 and the tuning structure 10 makes the overall layout of the filter more symmetrical, enabling it to match the magnetic field distribution states of the four tuning modes. This improves the coupling control performance of the tuning structure 10, thereby enhancing the filtering performance of the filter.

[0056] In this embodiment, the two excitation structures 20 are located on both sides of the tuning structure 10 and are symmetrically arranged about the center plane of the rectangular dielectric block.

[0057] like Figures 1 to 3 As shown, the rectangular dielectric block has a receiving through-hole 31 located within the rectangular cavity, which is used to accommodate the excitation structure 20. Thus, the excitation structure 20 in this embodiment actually adopts a probe method (receiving through-hole 31), thereby making the overall structure of the filter simpler and easier to manufacture and implement.

[0058] In this embodiment, the receiving through hole 31 of the rectangular medium block can be adapted to the forming medium of the rectangular medium block. For example, plastic medium can be formed by mold forming, as long as it can form the receiving through hole 31.

[0059] In this embodiment, the receiving through hole 31 is a cylindrical through hole, and its radius is not limited. That is, the hole wall of the receiving through hole 31 can be in close contact with the excitation structure 20, or there can be a gap between it and the excitation structure 20.

[0060] In this embodiment, the rectangular housing 30 has a through hole that communicates with the receiving through hole 31 and is used for the excitation structure 20 to pass through. Thus, the above arrangement provides a basis for the excitation structure 20 to pass through, ensuring that the excitation structure 20 can pass into the receiving through hole 31.

[0061] like Figures 10 to 13 As shown, it respectively shows TE 201 Resonant mode and TE 202 Figure 57 shows the coupling relationship between the relative coupling bandwidth between resonant modes and the radius R of the tuning structure. 201 Resonant mode and TE d0d Figure 58 shows the coupling relationship between the relative coupling bandwidth between resonant modes and the radius R of the tuning structure. 202 Resonant mode and TE d0d Figure 59 shows the coupling relationship between the relative coupling bandwidth between the resonant modes and the radius R of the tuning structure, and Figure 60 shows the frequency response curve of the filter's S-parameters. As can be seen from the above schematic diagrams, in this embodiment, only a single tuning structure 10 is needed to synchronously disturb and couple the four resonant modes. That is, in this embodiment, the filter can achieve its basic filtering function while having the advantages of small size and simple structure, and can be applied to various electronic devices with increasingly miniaturized designs.

[0062] like Figures 14 to 16 As shown, this embodiment also provides a filter assembly, which includes at least two filters and an exciter 40. In two adjacent filters, a receiving through-hole 31 of one filter is coaxially arranged with a receiving through-hole 31 of the other filter to form a connecting through-hole. The exciter 40 passes through the connecting through-hole, and the portion of the exciter 40 located within the receiving through-hole 31 forms an excitation structure 20 of the filter corresponding to that receiving through-hole 31. In the filters located at both ends, the excitation structures 20 of the two filters located outside the connecting through-holes respectively form an input terminal and an output terminal. The filters described above are the aforementioned filters.

[0063] In this embodiment, the overall structure of the filter is very simple (the tuning structure 10 is just a cylindrical structure set in a rectangular dielectric block, and a probe-type excitation method is used), which enables multiple filters to be cascaded. That is, by connecting the receiving through holes 31 of two filters to each other and setting them coaxially (in fact, it is only necessary to place one filter on the other filter and align the receiving through holes 31), the probe-type excitation element 40 can realize the conduction between two adjacent filters. That is, a specific frequency wave filtered by one filter can be introduced into the next-stage filter for further filtering through the excitation element. The number of filters in the filter assembly can be arbitrarily set according to actual needs, which greatly improves the filtering performance of the filter assembly.

[0064] like Figure 13 and Figure 16 As shown in the diagram, the S-parameter frequency response curves of the filter (Figure 60) and the S-parameter frequency response curves of the cascaded filter (Figure 61) are respectively shown (the S-parameter frequency response curves of the actual dual-cavity four-mode filter in this diagram, i.e., the filter assembly consists of two cascaded filters). As can be seen from the above diagram, the filter assembly with two cascaded filters has a larger passband bandwidth and better filtering performance.

[0065] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0066] The rectangular dielectric block of the filter has TE 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Resonant mode, TE 102 Resonant mode and TE 201 The resonant modes are degenerate, and at least part of the tuning structure is located within a rectangular dielectric block for use with TE. 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Perturbation coupling is achieved between resonant modes. At least part of the excitation structure is located within a rectangular dielectric block, with at least two excitation structures, at least one serving as the input and at least the other as the output. Thus, the filter in this application is actually a single-cavity four-mode filter, achieved through the design of the rectangular dielectric block and the special selection of the resonant modes (i.e., TE). 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Resonant mode, TE 102 Resonant mode and TE 201The resonant modes are degenerate, allowing a single tuning structure to perturb and couple all four resonant modes. Compared to existing multi-cavity multi-mode filters, the filter structure in this application is simpler and smaller, thus solving the problem of large size in existing multi-mode filters. Furthermore, the TE selected in this application... d0d Higher-order modes are beneficial for widening the passband bandwidth, resulting in better filtering performance of the filter.

[0067] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0068] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A filter, characterized in that, The filter includes: Rectangular media block with TE 102 Resonant mode, TE 201 Resonant mode, TE 202 Resonance mode and TE d0d Resonant mode, the TE 102 Resonant mode and the TE 201 The resonant modes are degenerate modes; Tuning structure (10), at least a portion of which is disposed within the rectangular dielectric block, the tuning structure (10) being used to tune the TE 102 Resonance mode, the TE 201 Resonance mode, the TE 202 Resonance mode and the TE d0d Perturbation coupling is performed between resonant modes; Excitation structure (20), at least part of the excitation structure (20) is disposed in the rectangular medium block, and there are at least two excitation structures (20), at least one of the excitation structures (20) is an input terminal, and at least another excitation structure (20) is an output terminal; At least a portion of the tuning structure (10) coincides with the geometric center of the rectangular medium block; at least a portion of the tuning structure (10) is made of metallic material; the tuning structure (10) is cylindrical in shape. TE d0d It is a higher-order mode; the tuning structure (10) is arranged along the height direction of the rectangular dielectric block, and the radius of the tuning structure (10) is R, so that by adjusting the radius R of the tuning structure (10), the TE can be adjusted. 102 Resonance mode, the TE 201 Resonance mode, the TE 202 Resonance mode and the TE d0d The resonant mode is used for synchronous disturbance and coupling control.

2. The filter according to claim 1, characterized in that, The filter also includes: A rectangular shell (30) has a rectangular cavity filled with a medium to form the rectangular medium block.

3. The filter according to claim 2, characterized in that, At least a portion of the rectangular shell (30) is made of metallic material.

4. The filter according to any one of claims 1 to 3, characterized in that, The tuning structure (10) is prism-shaped, the excitation structure (20) is a probe, and the central axis of the tuning structure (10) is parallel to the central axis of the excitation structure (20); or, the central axis of the tuning structure (10) and the central axis of the excitation structure (20) are set at an angle.

5. The filter according to claim 4, characterized in that, There are two excitation structures (20), and the two excitation structures (20) are located on both sides of the tuning structure (10).

6. The filter according to claim 2, characterized in that, The rectangular dielectric block has a receiving through hole (31) for receiving the excitation structure (20).

7. The filter according to claim 6, characterized in that, The rectangular housing (30) has a through hole that communicates with the receiving through hole (31) and is used for the excitation structure (20) to pass through.

8. A filter assembly, characterized in that, The filter assembly includes at least two filters and an exciter (40). In two adjacent filters, a receiving via (31) of one filter is coaxially arranged with a receiving via (31) of the other filter to form a connecting via. The exciter (40) passes through the connecting via. The portion of the exciter (40) located inside the receiving via (31) forms an excitation structure (20) of the filter corresponding to the receiving via (31). In the filters located at both ends, the excitation structures (20) of the two filters located outside the connecting via respectively form an input end and an output end. The filter is the filter according to any one of claims 1 to 7.

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