A cross-coupled filter

Abstract

The present invention discloses a cross-coupling filter, including a minimum resonant structure, which is composed of four resonators, in which two resonators in the same row form a group, and the two resonators in the same row are mainly electrically coupled or magnetically coupled; the two resonators in the same column are electromagnetically mixed coupled; and the coupling polarities of the two groups of resonators in the two rows of resonant units are opposite, and at least one cross coupling is formed. The present invention realizes miniaturization and light weight in structural characteristics, and realizes low loss and good harmonic characteristics in electrical performance.

Description

Technical Field

[0001] The present invention relates to a filter, in particular to a cross-coupling filter. Background Art

[0002] The recent filter demand trend is miniaturization and high quality, especially the communication components used in small base stations for 5G communication are smaller in size and required in larger quantities than previous macro base station products. Therefore, the components used inside the product must also be miniaturized, lightweight, and have a structure suitable for mass production.

[0003] The filters currently used in small base stations are usually dielectric waveguide filters and traditional metal coaxial filters. Dielectric waveguide filters can be miniaturized and lightweight, and have low manufacturing costs, but their loss and harmonic characteristics are worse than those of metal coaxial filters. Traditional metal coaxial filters have better loss and harmonic characteristics than dielectric waveguide filters, but the reduction in size and weight in design characteristics has reached a certain limit, and the number of internal components has also reached a limit, which cannot achieve the purpose of reducing manufacturing costs.

[0004] For example, the patent application number: CN201710149229.5 discloses a filter with a frame structure. In this scheme, the two sides of the U-shaped frame are open structures, and the partition wall divides the inside of the frame into two spaces. Perpendicular to this partition wall, there is an integrated resonator. The resonator is bent into an L-shape or T-shape to reduce the space requirement, but this form still has limitations on the miniaturization of the filter and is difficult to meet the design requirements of the filter's small volume.

[0005] Furthermore, in order to form cross-coupling, the above scheme adds a sheet or line conductor structure between non-adjacent resonators in the form of an open circuit or a short circuit, and needs to add an insulator to the frame or weld a conductor in the form of a wire to the resonator. Such a structure will incur processing costs and processing tolerances, and when the frame and the resonator are an integrated structure, the frequency drift of the filter will be large with the ambient temperature.

[0006] For example, in the patent application number: CN 201910044005.7, a filter is disclosed, in which the resonator is bent multiple times to achieve miniaturization of the filter, and cross-coupling can be achieved without additional structural parts. However, this structure still has the following disadvantages: 1. Although the multiple bending of the resonator is conducive to miniaturization, the relatively lower Q value leads to the worse insertion loss in the electrical performance of the filter; and when the mold is opened to make the product, the volume of the component is relatively smaller than that of an ordinary filter and has bends, which may cause deformation during die-casting; 2. The harmonic characteristics of the 2nd frequency need to be improved.

[0007] For example, in the patent application number: CN 201810540869.3, a miniaturized filter was applied for. In this solution, the resonator is bent multiple times to achieve the miniaturization of the filter, and the resonant rods are all comb-shaped, extending in the same direction, and cross-coupling is achieved through coupling windows, without the need for additional structural parts. However, this structure still has the following disadvantages: 1. Although multiple bending of the resonator is conducive to miniaturization, the relatively lower Q value leads to worse insertion loss in the electrical performance of the filter; 2. In order to strengthen the coupling between the resonant units of each layer, the window on the shielding layer must be opened very large, which brings certain limitations to increasing the bandwidth; 3. The starting direction of the resonator is single, and the transformation of the coupling form is limited.

[0008] Therefore, it is necessary to propose a new type of miniaturized and lightweight filter to solve the problems of the above-mentioned filter in electrical performance, such as poor insertion loss and suppression, the possibility of deformation during die-casting, and the need for improvement of 2nd harmonics. Summary of the invention

[0009] The purpose of the present invention is to overcome the defects of the prior art and provide a cross-coupling filter.

[0010] To achieve the above object, the present invention proposes the following technical solution: a cross-coupled filter, comprising a resonance structure, wherein the resonance structure comprises at least two rows of resonance units and at least two columns of resonance units, wherein each row and each column of resonance units comprises at least two resonators, wherein, in two adjacent rows of resonance units, two adjacent resonators in any row of resonance units, and two adjacent resonators in the same column as the two adjacent resonators in the other row, constitute a minimum resonance structure,

[0011] In the minimum resonant structure, two resonators in the same row form a group, and the two resonators in the same row are mainly electrically coupled or magnetically coupled; the two resonators in the same column are electromagnetically mixed coupled; and the coupling polarities of the two groups of resonators in the two rows of resonant units are opposite, and at least one cross coupling is formed;

[0012] The coupling polarity includes mainly electric coupling or mainly magnetic coupling;

[0013] Preferably, in the resonant structure, two adjacent resonators in the same row are mainly electrically coupled or magnetically coupled; two adjacent resonators in the same column are coupled by electromagnetic hybrid coupling, and the coupling polarities of two adjacent groups of resonators in the same row are opposite and / or the coupling polarities of two adjacent groups of resonators in two adjacent rows are opposite, and at least one cross coupling is formed.

[0014] Preferably, the multiple rows of resonance units are located on the same plane or arranged in layers.

[0015] Preferably, the resonant tails of two adjacent resonators in the same row are connected or opposite to each other, forming mainly magnetic coupling, or the resonant heads are opposite to each other, forming mainly electric coupling; the two adjacent resonators in the same column are arranged in parallel or approximately in parallel, and electromagnetic hybrid coupling is formed between the two adjacent resonators in the same column.

[0016] Preferably, two adjacent groups of resonators in two adjacent rows are arranged in a structural distribution that is mainly electric coupling and mainly magnetic coupling, alternating between phases, so that the coupling polarities of the two adjacent groups of resonators in the two adjacent rows are opposite, and / or, multiple groups of resonators in the same row are arranged in a structural distribution that is mainly electric coupling and mainly magnetic coupling, alternating between phases, so that the coupling polarities of the two adjacent groups of resonators in the same row are opposite.

[0017] Preferably, the resonant structure is integrally formed, or at least two resonators in the resonant structure are integrally formed.

[0018] Preferably, the resonance structure further comprises a frame, and the resonance unit is integrally formed on the frame or assembled on the frame.

[0019] Preferably, the filter further comprises a cover plate disposed on the resonant structure, the cover plate comprising a plurality of protrusions and at least one shielding wall, wherein:

[0020] The protrusion is formed by extending from the end surface of the cover plate close to the resonant structure in the direction close to the resonant structure, and the setting position of the protrusion on the cover plate corresponds to the position of the resonant head of the resonator on the resonant structure;

[0021] The shielding wall is located between two adjacent resonators.

[0022] Preferably, the cross-coupling filter further comprises at least one structural member for enhancing the cross-coupling between resonators, wherein the structural member connects two resonators to form a cross-coupling.

[0023] Preferably, the filter further comprises a plurality of tuning screws and a plurality of coupling adjustment screws, wherein the tuning screws are located above the corresponding resonators and are used to adjust the resonant frequency of the resonators; and the coupling adjustment screws are located between two adjacent resonators and are used to adjust the coupling amount between the resonators.

[0024] Preferably, the multiple rows of resonance units are distributed along a signal transmission path, and the signal transmission path is a U-shaped or S-shaped path or a curved path formed by multiple continuous U-shaped or continuous S-shaped paths.

[0025] Preferably, the filter further comprises a signal input port and a signal output port respectively arranged at two ends of the signal transmission path.

[0026] Preferably, the filter is a resonator filter of 4th order or higher.

[0027] The beneficial effects of the present invention are:

[0028] 1. The advantages of dielectric waveguide filters and metal coaxial filters are integrated as much as possible, and miniaturization and lightness are achieved in terms of structural characteristics, and low loss and good harmonic characteristics are achieved in terms of electrical performance. In addition, the number of internal components of the filter is minimized as much as possible, which reduces the production cost and simplifies the production process to suit mass production.

[0029] 2. Use multiple rows of resonant units in a layered or single-layer arrangement, increase cross-coupling between each row, and strengthen the coupling between rows of resonant units. Use the interdigital coupling and the opposite coupling polarity of the main channel to generate transmission zeros, which can realize the miniaturization of the filter design and improve the loss.

[0030] 3. The resonant structure of the filter can adopt an integral frame structure, which is simple to assemble, has good assembly tolerance consistency, and can maintain stable product quality.

[0031] 4. Adjusting the coupling amount on the cavity and improving the shielding structure of harmonics can reduce the volume of the resonator, realize the miniaturization of the filter, improve the Q value of the resonator, reduce the loss and other filtering characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0033] Figure 2 yes Figure 1 Schematic diagram of the split structure;

[0034] Figure 3 yes Figure 1 A schematic diagram of the structure of the resonant structure;

[0035] Figure 4 is a simulation waveform diagram of embodiment 1 of the present invention;

[0036] Figure 5 is a schematic structural diagram of Embodiment 2 of the present invention;

[0037] Figure 6 is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0038] Figure 7 is a schematic structural diagram of Embodiment 4 of the present invention;

[0039] Figure 8 is a schematic diagram of the structure of Embodiment 5 of the present invention;

[0040] Fig. 9 is a schematic diagram of the structure of Embodiment 6 of the present invention;

[0041] Fig.10is a schematic diagram of the split structure of Example 7 of the present invention;

[0042] Fig.11 It is a structural schematic diagram of the cover plate of the present invention;

[0043] Fig.12 is a schematic structural diagram of a resonant structure according to Embodiment 7 of the present invention;

[0044] Fig.13 is a simulation waveform diagram of embodiment 7 of the present invention;

[0045] Fig.14 is a schematic diagram of the split structure of Example 8 of the present invention;

[0046] Fig.15 is a schematic structural diagram of a resonant structure according to Embodiment 8 of the present invention;

[0047] Fig.16 is a simulation waveform diagram of Embodiment 8 of the present invention;

[0048] Fig.17 It is a schematic diagram of the split structure of the filter (resonance structure replacement structure) of the present invention;

[0049] Fig.18a It is a schematic diagram of the structure of the 4th order filter of the present invention;

[0050] Fig.18b The present invention Fig.18a Structural diagram of the minimum resonant structure in ;

[0051] Fig.18c It is a simulation waveform diagram of the 4th order filter of the present invention;

[0052] Fig.19a is a schematic diagram of the split structure of Example 9 of the present invention;

[0053] Fig.19b is a schematic structural diagram of a resonant structure according to Embodiment 9 of the present invention;

[0054] Fig.19c It is a simulation waveform diagram of embodiment 9 of the present invention.

[0055] Reference numerals:

[0056] 1. Resonant structure, 12 / 12a~12h, resonator, 121, resonant head, 122, resonant middle, 123, resonant tail, 2. First cover plate, 21, raised portion, 22, recessed portion, 23, shielding wall, 24, connecting column, 3. Second cover plate, 4. Signal input port, 5. Signal output port, 6. Frame, 61, partition wall, 62, coupling window, S1, transmission loss waveform, S2, return loss waveform, A, minimum resonant structure, 7. Tuning screw, 8. Coupling adjustment screw, A, minimum resonant structure. DETAILED DESCRIPTION

[0057] The technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention.

[0058] like Figure 1 As shown, a cross-coupling filter disclosed in the present invention includes a resonant structure 1, which specifically includes multiple rows of resonant units and multiple columns of resonant units, and each row of resonant units and each column of resonant units includes multiple resonators 12. When implemented, Fig.12 As shown, the resonant structure 1 can adopt an integral frame integrated structure (i.e., the resonator is added with a frame 6 and connected into an integrated form). The frame integrated resonant structure 1 has the advantages of simple assembly, good assembly tolerance consistency, and can maintain stable product quality. It can also be a split structure without a frame, such as Figure 1 and Fig.17 As shown, multiple rows of resonance units of the resonance structure 1 are fixed in a frame 6 separately (eg, by fixing members such as screws).

[0059] In addition, the multiple rows of resonant units of the resonant structure 1 can be located on the same plane, that is, on the same layer, during implementation. This structure can significantly reduce the size of the filter in the height direction. The multiple rows of resonant units can also be arranged in layers, that is, not on the same plane. Figure 1 and Figure 2 As shown, each row of resonant units is vertically fixed in the frame 6, and multiple rows of resonant units are arranged in parallel along the longitudinal direction of the frame 6 (ie, along the front and rear direction of the frame 6); Figure 6 and Fig. 9 , Fig.10 , Fig.15 As shown, multiple rows of resonant units are located on the same plane.

[0060] like Figure 5 , Figure 8 , Fig. 9As shown, the minimum resonant structure A formed by the filter of the present invention is a 4th order filter. Specifically, the minimum resonant structure A is composed of two rows of adjacent resonant units and two columns of adjacent resonant units, wherein each row of resonant units and each column of resonant units have two resonators. In implementation, the filter can be directly the minimum resonant structure A, that is, the filter is a 4th order filter, or the minimum resonant structure A is formed in other multi-order (such as 6th order, 8th order, etc.) filters higher than the 4th order, and its position in the filter is not limited. Specifically, in two rows of adjacent resonant units, two adjacent resonators in any row of resonant units, and two adjacent resonators in the other row that are in the same column as the two adjacent resonators, constitute the minimum resonant structure.

[0061] During implementation, except for the minimum resonant structure A in the filter, the present invention does not limit the coupling polarity, arrangement, etc. between other resonators 12 in the filter.

[0062] In addition, the shape design of the resonator 12 and its arrangement structure in the frame 6 determine the coupling mode between the resonators 12. Figure 1 As shown, each resonator 12 is a cylindrical structure as a whole, specifically including a resonant head 121, a resonant middle part 122, and a resonant tail 123, wherein the resonant head 121 is the part with the strongest electrical coupling strength of the resonator 12, and conversely, the resonant tail 123 is the part with the strongest magnetic coupling strength of the resonator 12. Preferably, the width of the resonant head 121 is designed to be wider than the width of the resonant middle part 122 and the resonant tail 123, so that the volume of the resonator 12 can be further reduced under the same frequency requirement. Of course, a resonator structure with multiple bends is also applicable to the present invention.

[0063] Multiple rows of resonators 12 are arranged along a signal transmission path in the frame 6. The signal transmission path can be U-shaped or S-shaped, or a curved path formed by multiple continuous U-shaped or S-shaped paths. The coupling mode of two adjacent resonators 12 on the signal transmission path is determined by the shapes of the two and their relative arrangement positions. It should be explained that the coupling of a general TEM (transverse electromagnetic mode) mode filter is the coexistence of electric coupling and magnetic coupling. When the coupling amount of one of the two couplings is much greater than the coupling amount of the other, the larger one is called the dominant coupling. The dominant coupling mode in the filter of the present invention can be determined by the arrangement position of the two coupled resonators. If the coupling amount of the two is mainly generated by the resonant head, the main coupling is mainly electric coupling. If the coupling amount of the two is mainly generated by the resonant tail, the main coupling is magnetic coupling. If the difference between the amount of electric coupling and the amount of magnetic coupling between the two is not large, it is electromagnetic hybrid coupling.

[0064] Among them, when the resonators in the same row are arranged horizontally, the resonators in the same column are arranged vertically, and the signal can be transmitted along one of the directions (i.e., horizontally or vertically) first; when the resonators in the same row are arranged vertically, the resonators in the same column are arranged horizontally, and the signal can also be transmitted along one of the directions first.

[0065] like Fig.18a As shown, the filter is a 4th order filter, specifically comprising a first cover plate 2, a second cover plate 3 and a minimum resonant structure, wherein the combination Fig.18b As shown, the minimum resonant structure is composed of two rows of resonant units and two columns of resonant units, that is, it includes four resonators, which are defined as 12a, 12b, 12c and 12d respectively. At this time, the resonators in the same row are arranged horizontally, and the resonators in the same column are arranged vertically, and the signal is first transmitted along the vertical direction. The two resonators 12 in the same row of the minimum resonant structure are mainly electrically coupled or magnetically coupled. Fig.18a In the minimum resonant structure shown, the electrical coupling is dominant between the resonators 12a and 12d in the same row, and the magnetic coupling is dominant between the resonators 12b and 12c in the same row.

[0066] For ease of description, the two resonators 12 in the same row of this embodiment are defined as a group. The two adjacent resonators 12 in the same column are electromagnetically mixedly coupled, and the coupling polarities of the two groups of resonators 12 in the two rows of resonance units are opposite. The coupling polarity here includes the above-mentioned electric coupling as the main coupling and magnetic coupling as the main coupling, that is, the coupling polarity of the two groups of resonators 12 in the two rows of resonance units, one group of coupling modes is mainly electric coupling, and the other group of coupling modes is mainly magnetic coupling. In addition, at least one cross-coupling is formed in the two columns of resonators 12 in the two rows of resonance units, such as Fig.18c shown.

[0067] like Figure 5 and Figure 8 , Fig. 9 As shown, in a specific embodiment, at this time, the resonators in the same row are arranged horizontally, and the resonators in the same column are arranged vertically, and the signal is first transmitted in the horizontal direction. The two resonators 12 in the same row of the minimum resonance structure A are mainly electrically coupled or magnetically coupled. For the convenience of description, the two resonators 12 in the same row in this embodiment are defined as a group. There is electromagnetic mixed coupling between two adjacent resonators 12 in the same column, and the coupling polarities of the two groups of resonators 12 in the two rows of resonance units are opposite. The coupling polarity here includes the above-mentioned mainly electrically coupled and mainly magnetically coupled, that is, the coupling polarity of the two groups of resonators 12 in the two rows of resonance units, one group of coupling modes is mainly electrically coupled, and the other group of coupling modes is mainly magnetically coupled. In addition, at least one cross-coupling is formed in the two columns of resonators 12 in the two rows of resonance units.

[0068] Specifically, in this embodiment, the resonant tails 123 of the two resonators 12 in the same row of the minimum resonant structure A are connected or opposite, or the resonant heads 121 are arranged oppositely. When the resonant tails 123 are connected or opposite, the coupling formed is mainly magnetic coupling; when the resonant heads 121 are arranged oppositely, the coupling formed is mainly electric coupling. The two resonators 12 in the same column are arranged in parallel or approximately in parallel, but the directions of the resonant heads 121 or resonant tails 123 of the two are opposite. For example, if the resonant head 121 of one resonator 12 faces left, the resonant head 121 of the other resonator faces right. Of course, the two resonators 12 in the same column are not limited to this arrangement structure in which the resonators face opposite directions, as long as electromagnetic hybrid coupling between the two can be achieved. And the coupling polarities of the two groups of resonators 12 of the two rows of resonance units are opposite. Specifically, if the resonance heads 121 of the two resonators 12 (i.e., one group of resonators) in one row are arranged relative to each other, forming a mainly electric coupling, then the resonance tails 123 of the two resonators in the other row (i.e., another group of resonators) are connected or opposite to each other, forming a mainly magnetic coupling. Of course, the two groups of resonators 12 of the two rows of resonance units are not limited to the arrangement structure introduced here, as long as the structural distribution of the two adjacent groups of resonators in two adjacent rows can be achieved in which the main electric coupling and the main magnetic coupling are alternately distributed.

[0069] In addition, other resonators 12 in the filter can be extended and extended according to the coupling mode between the resonators 12 in this embodiment, and expanded into a filter structure with at least two rows and at least two columns of resonators 12. Specifically, two adjacent resonators 12 in the same row are mainly electrically coupled or magnetically coupled; two adjacent resonators 12 in the same column are electromagnetically hybrid coupled, and the coupling polarities of two adjacent groups of resonators 12 in the same row are opposite and / or the coupling polarities of two adjacent groups of resonators 12 in two adjacent rows are opposite, and at least one cross-coupling is formed in the multiple columns of resonators 12 in the multiple rows of resonance units.

[0070] like Fig.12 and Fig.15 As shown, in another specific replacement embodiment, the resonators in the same row are arranged horizontally, and the resonators in the same column are arranged vertically, and the signal starts to be transmitted along the vertical direction first, and the two resonators 12 in the same column of the minimum resonance structure A are electromagnetically mixedly coupled, that is, the amount of electric coupling and magnetic coupling between the two adjacent resonators 12 reaches the value of forming electromagnetic mixed coupling. The two adjacent resonators 12 in the same row are mainly electrically coupled or magnetically coupled. For the convenience of description, the two resonators 12 in the same row in this embodiment are defined as a group. And the coupling polarities of the two groups of resonators 12 in the two rows of resonance units are opposite. In addition, at least one cross-coupling is formed in the two columns of resonators 12 in the two rows of resonance units.

[0071] Specifically, two resonators 12 in the same column are arranged in parallel or approximately in parallel, but the directions of their resonant heads 121 or resonant tails 123 are opposite; the resonant tails 123 of two resonators in the same row are connected or the resonant heads 121 are arranged relative to each other; the arrangement method of the two groups of resonators 12 of the two rows of resonant units is the same as explained above, which will not be repeated here.

[0072] Similarly, other resonators 12 in the filter can also be extended and extended according to the coupling mode between the resonators 12 in the replacement embodiment, and expanded into a filter structure with at least two rows and at least two columns of resonators 12. Specifically, two adjacent resonators 12 in the same column are electromagnetically mixedly coupled; two adjacent resonators 12 in the same row are mainly electrically coupled or magnetically coupled, and the coupling polarities of two adjacent groups of resonators 12 in the same row are opposite and / or the coupling polarities of two adjacent groups of resonators 12 in two adjacent columns are opposite, and at least one cross-coupling is formed. The cross-coupling generates a transmission zero point on the left and right sides of the bandwidth, and according to the number of resonators 12, the number of cross-couplings can be increased to increase the number of zero points. The cross-coupling between the resonators 12 of the present invention does not require additional structural parts, but additional structural parts (such as metal rods, insulators and other supporting parts, not shown in the figure) can be added between the two adjacent resonators 12 that form the cross-coupling according to the situation to further increase the amount of cross-coupling.

[0073] Furthermore, the filter also includes a cover plate disposed on the resonant structure, and a closed filter cavity is formed between the cover plate and the resonant structure. When implemented, the cover plate may include a first cover plate 2 and a second cover plate 3 respectively covering the end surfaces of both sides of the resonant structure. The structures of the first cover plate 2 and the second cover plate 3 are basically the same. Here, the structure of the first cover plate 2 is specifically introduced, and the second cover plate 3 is not repeated. Please refer to the description of the first cover plate 2 below. Fig.11 As shown, the first cover plate 2 includes a plurality of protrusions 21, at least one shielding wall 23 and at least one connecting column 24 arranged on its lower end surface, and the lower end surface here is the side close to the resonant structure 1. The protrusions 21 are formed by extending from the lower end surface of the first cover plate 2 in the direction close to the resonant structure 1, and the setting position of the protrusions 21 on the first cover plate 2 corresponds to the position of the resonant head 121 of the resonator 12, that is, the protrusions 21 are arranged on the lower end surface of the first cover plate 2 at the position corresponding to the resonant head 121 of the resonator, which will shorten the distance between the first cover plate 2 and the resonant head 121 of the resonator 12, because the closer to the resonator 12, the greater the distributed capacitance, and the lower the resonant frequency, which can effectively shorten the length of the resonator, and then relatively reduce the volume of the filter, thereby realizing the miniaturization of the filter.

[0074] A plurality of recessed portions 22 are formed on the first cover plate 2 opposite to the raised portion 21. The recessed portions 22 are arranged on the first cover plate 2 at positions corresponding to the resonant tail portion 123 of the resonator 12. That is, the recessed portions 22 are arranged on the lower end surface of the first cover plate 2 at positions corresponding to the resonant tail portion 123 of the resonator 12. This will expand the space between the resonant tail portion 123 and the first cover plate 2, because the farther away from the resonator 12, the greater the inductance, and the higher the resonant frequency. This can shorten the length of the resonator 12, relatively reduce the volume of the filter, improve the Q value of the resonator, and reduce the loss.

[0075] The shielding wall 23 is disposed between two adjacent resonators 12 to adjust the coupling strength between the two resonators 12. Although the coupling strength between the resonators 12 can be adjusted by the spacing between the resonators 12, this method may increase the volume of the filter. The shielding wall 23 can adjust the coupling strength between the resonators 12 without affecting the volume of the filter.

[0076] The connecting column 24 is disposed between two adjacent resonators 12 in the same row and connects the first and second cover plates 2 and 3. The connection column 24 can improve the harmonic characteristics of the filter. When the connection column 24 is implemented, it is disposed on the first cover plate or the second cover plate.

[0077] In addition, combined Figure 1 and Figure 2 As shown, the frame 6 may also be provided with a plurality of tuning screws 7 which pass through the upper end surface of the frame 6 and extend at the lower end above the corresponding resonator 12, for adjusting the resonant frequency of the resonator 12; and coupling adjustment screws 8 which pass through the upper end surface of the filter frame 6 and extend at the lower end between two adjacent resonators 12, for adjusting the coupling amount between the resonators 12.

[0078] The signal input port 4 and the signal output port 5 are respectively arranged at two ends of the above-mentioned signal transmission path, and their arrangement positions may be different according to different signal transmission paths.

[0079] The structure of the cross-coupling filter of the present invention is introduced below with reference to several specific embodiments.

[0080] Example 1

[0081] Combination Figure 1 to Figure 3 As shown, a cross-coupling filter of embodiment 1 of the present invention comprises a resonant structure 1, a first cover plate 2, and a second cover plate 3, wherein the first cover plate 2 and the second cover plate 3 are respectively covered on the front and rear sides of a frame 6 to form a closed filter cavity in the frame, and the resonant structure 1 is separately installed in the frame 6. The structures of the first cover plate 2 and the second cover plate 3 can be referred to the above description, and will not be repeated here. The structure of the resonant structure 1 is specifically introduced below.

[0082] like Figure 3 As shown, the filter formed by the resonant structure 1 of Example 1 of the present invention is a 6-order filter, which includes two rows of resonant units. The two rows of resonant units are not on the same plane, and are specifically arranged in layers along the front-to-back direction of the frame 6. Each row of resonant units is arranged vertically in the frame 6 (i.e., the up-and-down direction of the frame 6), and each row of resonant units includes 3 resonators 12, that is, 6 resonators 12 are arranged in the frame. For the convenience of description, these 6 resonators are defined as resonators 12a, resonators 12b...resonators 12f, wherein resonators 12a to resonators 12c are in one row, and resonators 12d to resonators 12f are in one row. The structure of each resonator is as described above, and will not be repeated here.

[0083] The six resonators are arranged in a U-shaped signal transmission path within the frame. Specifically, the signal is input from resonator 12a, passes through resonators 12b to 12e in sequence, and is finally output from resonator 12f. That is to say, the signal input port of the present embodiment 1 is electrically connected to resonator 12a, and the signal output port is electrically connected to resonator 12f.

[0084] Among them, between the resonators 12a and 12b in the same row, and between the resonators 12b and 12c, electric coupling is mainly formed, and magnetic coupling is mainly formed, that is, alternating coupling of electric coupling and magnetic coupling is mainly formed; between the resonators 12d and 12e in the same row, and between the resonators 12e and 12f, electric coupling is mainly formed, and magnetic coupling is mainly formed, that is, alternating coupling of electric coupling and magnetic coupling is mainly formed.

[0085] The resonators 12a and 12f, the resonators 12b and 12e, and the resonators 12c and 12d in the same column are all electromagnetic hybrid couplings, and the coupling polarity between the resonators 12a and 12b in two rows (specifically, mainly electric coupling) is opposite to the coupling polarity between the resonators 12f and 12e (specifically, mainly magnetic coupling), and the coupling polarity between the resonators 12b and 12c in two rows (specifically, mainly magnetic coupling) is opposite to the coupling polarity between the resonators 12e and 12d (specifically, mainly electric coupling).

[0086] And cross coupling (defined as the first cross coupling) is generated between the resonators 12b and 12e in the same column. Cross coupling (defined as the second cross coupling) is also generated between the resonators 12a and 12f in the same column. That is to say, two cross couplings are formed in the filter of the present embodiment 1, and each cross coupling generates a transmission zero point on the left and right sides of the bandwidth, thereby generating a total of four transmission zero points, such as Figure 4 shown.

[0087] Specifically, the resonant tail of the resonator 12a faces the left side wall of the frame 6 and is fixed to the frame by fixing screws, the resonant head is opposite to the resonant head of the resonator 12b, the resonant tail of the resonator 12b is connected to the resonant tail of the resonator 12c, and the resonant head of the resonator 12c faces the right side wall of the frame 6. The resonant tail of the resonator 12d in another row faces the right side wall of the frame 6, the resonant head is opposite to the resonant head of the resonator 12e, the resonant tail of the resonator 12e is connected to the resonant tail of the resonator 12f, and the resonant head of the resonator 12f faces the left side wall of the frame 6. In this way, the resonators 12a and 12f in the same column, the resonators 12b and 12e in the same column, and the resonators 12c and 12d in the same column have opposite directions.

[0088] Preferably, a partition wall 61 is further provided in the frame 6 and is located between two rows of resonance units. The partition wall is provided with at least one coupling window 62 for coupling the two rows of resonance units.

[0089] Example 2

[0090] like Figure 5 As shown, a cross-coupling filter of Example 2 of the present invention is an alternative implementation of Example 1. The filter formed by the resonant structure 1 of Example 2 of the present invention is also a 6-order filter, and it also includes two rows of resonant units. The two rows of resonant units are not on the same plane, and are specifically arranged in layers along the front-to-back direction of the frame. Different from Example 1, the resonators 12a, resonators 12b, resonators 12f and resonators 12e in this Example 2 constitute the above-mentioned minimum resonant structure A. In the minimum resonant structure A, the resonators 12a and 12b in the same row are mainly electrically coupled, and the resonators 12f and 12e in the same row are mainly magnetically coupled, and cross-coupling occurs between the resonators 12a and 12f.

[0091] Except for the minimum resonant structure A, the coupling modes of other resonators are not limited.

[0092] Specifically, the resonant tail of resonator 12a faces the right side wall of frame 6, and the resonant head is opposite to the resonant head of resonator 12b, the resonant tail of resonator 12b is connected to the resonant tail of resonator 12c, and the resonant head of resonator 12c faces the left side wall of frame 6. The resonant head of resonator 12d faces the left side wall of frame 6, and the resonant tail is opposite to the resonant head of resonator 12e, the resonant tail of resonator 12e is connected to the resonant tail of resonator 12f, and the resonant head of resonator 12f faces the right side wall of frame 6.

[0093] Example 3

[0094] like Figure 6As shown, a cross-coupled filter in Example 3 of the present invention is also an alternative implementation of the above-mentioned Example 1. Different from Example 1, the two rows of resonant units in this Example 3 are located on the same plane, and the arrangement structure and coupling method of the other six resonators are the same as those in the above-mentioned Example 1, which will not be described here.

[0095] Example 4

[0096] A cross-coupling filter according to Embodiment 4 of the present invention comprises a resonant structure 1, a frame 6, a signal input port 4 and a signal output port 5, wherein the resonant structure 1 is separately installed in the frame 6. The structure of the resonant structure 1 is described in detail below.

[0097] like Figure 7 As shown, the filter formed by the resonant structure 1 of Example 4 of the present invention is an 8th-order filter, which includes two rows of resonant units. The two rows of resonant units are not on the same plane, and are specifically arranged in layers along the front-to-back direction of the frame 6. Each row of resonant units is arranged vertically in the frame 6 (i.e., the up-and-down direction of the frame 6), and each row of resonant units includes 4 resonators 12, that is, 8 resonators 12 are arranged in the frame 6. For the convenience of description, these 8 resonators are defined as resonators 12a, resonators 12b...resonators 12h, wherein resonators 12a to resonators 12d are in one row, and resonators 12e to resonators 12h are in one row. The structure of each resonator is as described above and will not be repeated here.

[0098] The eight resonators are arranged in a U-shaped signal transmission path within the frame. Specifically, the signal is input from resonator 12a, passes through resonators 12b to 12g in sequence, and is finally output from resonator 12h. That is to say, the signal input port 4 of the present embodiment 4 is electrically connected to the resonator 12a, and the signal output port 5 is electrically connected to the resonator 12h.

[0099] Among them, between the resonators 12a and 12b in the same row, between the resonators 12b and 12c, and between the resonators 12c and 12d in the same row, alternating couplings mainly based on magnetic coupling, mainly based on electric coupling, and mainly based on magnetic coupling, that is, alternating couplings mainly based on magnetic coupling and mainly based on electric coupling, that is, alternating couplings mainly based on electric coupling and mainly based on magnetic coupling, that is, alternating couplings mainly based on electric coupling and mainly based on magnetic coupling, respectively.

[0100] The resonators 12a and 12h, the resonators 12b and 12g, the resonators 12c and 12f, and the resonators 12d and 12e in the same column are all electromagnetic hybrid couplings, and the coupling polarity between the resonators 12a and 12b in two rows (specifically, mainly magnetic coupling) is opposite to the coupling polarity between the resonators 12h and 12g (specifically, mainly electric coupling), and the coupling polarity between the resonators 12b and 12c in two rows (specifically, mainly electric coupling) is opposite to the coupling polarity between the resonators 12g and 12f (specifically, mainly magnetic coupling), and the coupling polarity between the resonators 12c and 12d in two rows (specifically, mainly magnetic coupling) is opposite to the coupling polarity between the resonators 12f and 12e (specifically, mainly magnetic coupling).

[0101] Furthermore, cross coupling (defined as the first cross coupling) is generated between the resonators 12c and 12f in the same column. Cross coupling (defined as the second cross coupling) is also generated between the resonators 12b and 12g in the same column. Cross coupling (defined as the third cross coupling) is also generated between the resonators 12a and 12h in the same column. That is to say, three cross couplings are formed in the filter of the fourth embodiment, and each cross coupling generates a transmission zero point on the left and right sides of the bandwidth, thereby generating a total of six transmission zero points, such as Figure 7 shown.

[0102] Specifically, the resonance head of the resonator 12a faces the left side wall of the frame 6, and the resonance tail is connected to the resonance tail of the resonator 12b, the resonance head of the resonator 12b is opposite to the resonance head of the resonator 12c, the resonance tail of the resonator 12c is connected to the resonance tail of the resonator 12d, and the resonance head of the resonator 12d faces the right side wall of the frame 6. The resonance tail of the resonator 12e in another row faces the right side wall of the frame 6, the resonance head is opposite to the resonance head of the resonator 12f, the resonance tail of the resonator 12f is connected to the resonance tail of the resonator 12g, the resonance head of the resonator 12g is opposite to the resonance head of the resonator 12h, and the resonator 12h faces the left side wall of the frame 6. In this way, the resonators 12a and 12h in the same column, the resonators 12b and 12g in the same column, the resonators 12c and 12f in the same column, and the resonators 12d and 12e in the same column have opposite directions.

[0103] Likewise, preferably, a partition wall 6 is further provided in the frame 6 and located between the two rows of resonance units. The partition wall 6 is provided with at least one coupling window 61 for coupling the two rows of resonance units.

[0104] Example 5

[0105] like Figure 8As shown, a cross-coupling filter of Example 5 of the present invention is an alternative implementation of Example 4. The filter formed by the resonant structure 1 of Example 4 of the present invention is also an 8th order filter, and it also includes two rows of resonant units. The two rows of resonant units are not on the same plane, and are specifically arranged in layers along the front and back directions of the frame. Different from Example 4, the resonators 12a, resonators 12b, resonators 12h and resonators 12g in this Example 5 constitute the above-mentioned minimum resonant structure A. In the minimum resonant structure A, the resonators 12a and resonators 12b in the same row are mainly electrically coupled, and the resonators 12h and resonators 12g in the same row are mainly magnetically coupled.

[0106] Except for the minimum resonant structure A, the resonators 12c and 12d in the same row are mainly electrically coupled, and the resonators 12f and 12e in the same row are mainly electrically coupled; the resonators 12f and 12g in the same row are electromagnetically mixed coupled, and the resonators 12b and 12c in the same row are mainly magnetically coupled.

[0107] Specifically, the resonant tail of resonator 12a faces the left side wall of frame 6, the resonant head is opposite to the resonant head of resonator 12b, the resonant tail of resonator 12b is connected to the resonant tail of resonator 12c, the resonant head of resonator 12c is opposite to the resonant head of resonator 12d, and resonator 12d faces the right side wall of frame 6. The resonant head of resonator 12e faces the right side wall of frame 6, the resonant head is opposite to the resonant head of resonator 12f, the resonant tail of resonator 12f is opposite to the resonant head of resonator 12g, the resonant tail of resonator 12g is connected to the resonant tail of resonator 12h, and the resonant tail of resonator 12h faces the left side wall of frame 6.

[0108] Example 6

[0109] like Fig. 9 As shown, a cross-coupling filter of Example 6 of the present invention is an alternative implementation of the above-mentioned Example 5. Different from Example 5, the two rows of resonant units in this Example 6 are located on the same plane, and the arrangement structure and coupling mode of the other six resonators are the same as those of the above-mentioned Example 1, which will not be described in detail here.

[0110] Example 7

[0111] Combination Figure 10 to Figure 12 As shown, a cross-coupling filter according to Embodiment 7 of the present invention comprises a resonant structure, wherein the resonant structure 1 is an integral frame structure. The structure of the resonant structure 1 is described in detail below.

[0112] The filter formed by the resonant structure 1 of Example 7 of the present invention is a 6-order filter, which includes a frame 6 and three rows of resonant units integrally formed in the frame 6, each row of resonant units includes two resonators 12, that is, six resonators 12 are arranged in the frame. For the convenience of description, these six resonators are defined as resonators 12a, resonators 12b... resonators 12f, wherein resonators 12a and resonators 12f are in one row, resonators 12b and resonators 12e are in one row, and resonators 12c and resonators 12d are in one row. The structure of each resonator is as described above and will not be repeated here.

[0113] The three rows of resonators 12 are distributed in the frame along the front and rear direction of the front and rear side walls of the frame 6. The six resonators are arranged in the frame according to a U-shaped signal transmission path. Specifically, the signal is input from the resonator 12a, passes through the resonators 12b to 12e in sequence, and finally output from the resonator 12f. That is, the signal input port of the present embodiment 1 is electrically connected to the resonator 12a, and the signal output port is electrically connected to the resonator 12f.

[0114] Among them, the resonators 12a and 12b in the same column and the resonators 12b and 12c in the same row are electromagnetically mixed coupling, the resonators 12c and 12d in the same row are mainly electrically coupled, the resonators 12d and 12e in the same column and the resonators 12e and 12f in the same row are also electromagnetically mixed coupling, the cross coupling (defined as the first cross coupling) generated between the resonators 12b and 12e in the same row is mainly magnetically coupled, which is opposite to the electric coupling between the resonators 12c and 12d, and the cross coupling (defined as the second cross coupling) between the resonators 12a and 12f in the same row is mainly electric coupling, which is opposite to the magnetic coupling between the resonators 12b and 12e. That is to say, the resonators 12c and 12d, the resonators 12b and 12e, and the resonators 12a and 12f are respectively electrically coupled, magnetically coupled, and electrically coupled, that is, alternating couplings of mainly electric coupling and mainly magnetic coupling are formed. In the present embodiment 1, two cross couplings are formed, and each cross coupling generates a transmission zero point on the left and right sides of the bandwidth, thereby generating a total of four transmission zero points, such as Fig.13 shown.

[0115] Specifically, the resonant tail 123 of the resonator 12a is integrally formed with the left side wall of the frame 6, the resonant head 121 is opposite to the resonant head 121 of the resonator 12f, and there is a coupling gap between the two resonant heads 121, and the resonant tail 123 of the resonator 12f is integrally formed with the right side wall of the frame 6; the resonant tails 123 of the resonators 12b and 12e are connected and integrally formed with the rear side wall of the frame 6, and the connection portion where the resonators 12b and 12e are connected to the rear side wall of the frame 6 is provided with A coupling window is provided for cross-coupling between the resonant heads 121 of the resonators 12a and 12f, and the resonant heads 121 are respectively facing the left and right walls of the frame 6 and are not in contact with the left and right walls; the resonant tail 123 of the resonator 12c is integrally formed with the left wall of the frame 6, and the resonant head 121 is opposite to the resonant head 121 of the resonator 12d, and there is a coupling gap between the two resonant heads 121, and the resonant tail 123 of the resonator 12d is integrally formed with the right wall of the frame 6.

[0116] Preferably, in order to increase the cross-coupling amount between the resonator 12a and the resonator 12f, the above-mentioned additional structural member connecting the resonator 12a and the resonator 12f may be added according to the situation to increase the coupling amount between the two.

[0117] Example 8

[0118] Combination Fig.14 and Fig.15 As shown, a cross-coupling filter of Example 8 of the present invention comprises a resonant structure 1, an upper cover plate 2, a lower cover plate 3, a signal input port 4 and a signal output port 5, wherein the filter formed by the resonant structure of Example 5 of the present invention is an 8th-order filter, which comprises a frame 6 and two rows of resonant units integrally formed in the frame 6, each row of resonant units comprises 4 resonators, that is, 8 resonators are arranged in the frame, and the resonant units are connected to the frame 6. Fig.15 As shown, for the convenience of description, the eight resonators are defined as resonator 12a, resonator 12b, ..., resonator 12h, wherein resonator 12a, resonator 12d, resonator 12e, and resonator 12h are in one row, and resonator 12b, resonator 12c, resonator 12f, and resonator 12g are in another row. The structure of each resonator is as described above and will not be repeated here.

[0119] Two rows of resonators are distributed in the frame along the front and rear directions of the front and rear side walls of the frame. And the eight resonators are arranged in the frame according to a signal transmission path formed by multiple continuous S shapes. Specifically, the signal is input from resonator 12a, passes through resonators 12b to 12g in sequence, and finally output from resonator 12h. That is to say, the signal input port of this embodiment 5 is electrically connected to resonator 12a, and the signal output port is electrically connected to resonator 12h.

[0120] Among them, the resonators 12a and 12b in the same column, the resonators 12c and 12d, the resonators 12e and 12f, and the resonators 12g and 12h are all electromagnetic hybrid couplings, the resonators 12b and 12c in the same row are mainly magnetically coupled, and the cross-coupling (defined as the first cross-coupling) generated between the resonators 12a and 12d is mainly electric coupling, which is opposite to the magnetic coupling between the resonators 12b and 12c; the resonators 12f and 12g in the same row are mainly magnetically coupled, and the cross-coupling (defined as the second cross-coupling) generated between the resonators 12e and 12h is mainly electric coupling, which is opposite to the magnetic coupling between the resonators 12f and 12g. That is to say, between resonator 12b and resonator 12c, between resonator 12a and resonator 12d, between resonator 12d and resonator 12e, between resonator 12c and resonator 12f, between resonator 12f and resonator 12g, between resonator 12e and resonator 12h, magnetic coupling is mainly formed, electric coupling is mainly formed, magnetic coupling is mainly formed, electric coupling is mainly formed, magnetic coupling is mainly formed, and electric coupling is mainly formed. Two cross couplings are formed in this embodiment 8, and each cross coupling generates a transmission zero point on the left and right sides of the bandwidth, respectively, so that a total of four transmission zero points are generated, such as Fig.16 shown.

[0121] Specifically, the resonant tail 123 of the resonator 12a is integrally formed with the left side wall of the frame 6, and the resonant head 121 is opposite to the resonant head 121 of the resonator 12d, and there is a coupling gap between the two resonant heads 121, and a shielding wall for adjusting the electrical coupling amount between the resonator 12a and the two resonant heads 121 of the resonator 12d is also provided. The resonant tails 123 of the resonator 12b and the resonator 12c are connected and integrally formed with the front side wall of the frame 6, and the resonant heads 121 of the two are facing oppositely. The resonant tail 123 of the resonator 12d is connected and integrally formed with the front side wall of the frame 6, and the resonant heads 123 of the two are facing oppositely. The resonant head 121 of the resonator 12c is opposite to the resonant head 121 of the resonator 12f, and is separated by the connecting portion where the resonator 12d and the resonator 12e are connected to the front side wall of the frame 6. The resonant tail 123 of the resonator 12f is connected to the resonant tail 123 of the resonator 12g and is integrally formed with the front side wall of the frame 6, and the resonant heads 121 of the two are facing oppositely. The resonant head 121 of the resonator 12e is opposite to the resonant head 121 of the resonator 12h, and there is a coupling gap between the two resonant heads 121, and a shielding wall 23 for adjusting the electrical coupling between the two resonant heads 121 is also provided between the two resonant heads 121.

[0122] Example 9

[0123] Combination Fig.19a and 19b As shown, a cross-coupling filter according to Embodiment 9 of the present invention comprises a resonant structure 1, a first cover plate 2 and a frame 6, wherein the first cover plate 2 covers the front and rear sides of the frame 6 to form a closed filter cavity in the frame 6, and the resonant structure 1 is separately installed in the frame 6. The structure of the resonant structure 1 is described in detail below.

[0124] like Fig.19b As shown, the filter formed by the resonant structure 1 of Example 9 of the present invention is an 8th order filter, which includes two rows of resonant units. The two rows of resonant units are on the same plane and are specifically arranged along the front-to-back direction of the frame 6. Each row of resonant units includes four resonators 12, that is, eight resonators 12 are arranged in the frame. For the convenience of description, these eight resonators are defined as resonators 12a, resonators 12b...resonators 12h, wherein resonators 12a to resonators 12d are one row, and resonators 12e to resonators 12h are one row. The structure of each resonator is as described above and will not be repeated here.

[0125] The eight resonators are arranged in a U-shaped signal transmission path within the frame. Specifically, the signal is input from resonator 12a, passes through resonators 12b to 12g in sequence, and is finally output from resonator 12h. That is to say, the signal input port of embodiment 9 is electrically connected to resonator 12a, and the signal output port is electrically connected to resonator 12h.

[0126] Among them, between the resonators 12a and 12h in the same column, and between the resonators 12b and 12g, electric coupling is mainly formed, and magnetic coupling is mainly formed, that is, alternating coupling of electric coupling and magnetic coupling is mainly formed; between the resonators 12c and 12f in the same column, and between the resonators 12d and 12e, electric coupling is mainly formed, and magnetic coupling is mainly formed, that is, alternating coupling of electric coupling and magnetic coupling is mainly formed.

[0127] The resonators 12a and 12b, the resonators 12b and 12c, and the resonators 12c and 12d in the same row are all electromagnetic hybrid couplings, and the coupling polarity between the resonators 12a and 12h located in two columns (specifically, mainly electric coupling) is opposite to the coupling polarity between the resonators 12b and 12g (specifically, mainly magnetic coupling), and the coupling polarity between the resonators 12c and 12f located in two columns (specifically, mainly electric coupling) is opposite to the coupling polarity between the resonators 12d and 12e (specifically, mainly magnetic coupling).

[0128] Furthermore, cross coupling (defined as the first cross coupling) is generated between the resonators 12c and 12f in the same column. Cross coupling (defined as the second cross coupling) is also generated between the resonators 12b and 12g in the same column, and cross coupling (defined as the third cross coupling) is also generated between the resonators 12a and 12h in the same column. That is to say, three cross couplings are formed in the filter of the present embodiment 9, and each cross coupling generates a transmission zero point on the left and right sides of the bandwidth, respectively, thereby generating a total of six transmission zero points, such as Fig.19c shown.

[0129] Specifically, the resonant tail of the resonator 12a faces the rear side wall of the frame 6 and is fixed to the frame by fixing screws, while the resonant head is opposite to the resonant head of the resonator 12h, and the resonant tail of the resonator 12h faces the front side wall of the frame 6 and is fixed to the frame by fixing screws; the resonant head of the resonator 12b faces the rear side wall of the frame 6, the resonant tail of the resonator 12b is connected to the resonant tail of the resonator 12g, and the resonant head of the resonator 12g faces the front side wall of the frame 6. The resonant tail of the resonator 12c is fixed to the rear side wall of the frame 6, the resonant head is opposite to the resonant head of the resonator 12f, and the resonant tail of the resonator 12f is fixed to the front side wall of the frame 6; the resonant tail of the resonator 12d is connected to the resonant tail of the resonator 12h, and the resonant heads of the resonators 12d and 12e face the rear side wall and the front side wall of the frame 6 respectively. In this way, the resonators 12a and 12b, resonator 12b and 12c, and resonator 12c and 12d in the same row are oriented in opposite directions; the resonators 12e and 12f, resonator 12f and 12g, and resonator 12g and 12h in the same row are oriented in opposite directions.

[0130] Preferably, a partition wall 61 is further provided in the frame 6 and is located between two rows of resonance units. The partition wall is provided with at least one coupling window 62 for coupling the two rows of resonance units.

[0131] In addition to the 6th order and 8th order filters described in the above embodiments 1 to 8, the present invention is applicable to any filter of 4th order and above.

[0132] The technical contents and technical features of the present invention have been disclosed as above. However, those skilled in the art may still make various substitutions and modifications based on the teachings and disclosures of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications that do not depart from the present invention and are covered by the claims of this patent application.

Claims

1. A cross-coupled filter, characterized in that: It includes: A resonance structure, wherein the resonance structure comprises at least two rows of resonance units and at least two columns of resonance units, each row and each column of resonance units comprises at least two resonators, wherein, in two adjacent rows of resonance units, two adjacent resonators in any row of resonance units and two adjacent resonators in the same column as the two adjacent resonators in the other row constitute a minimum resonance structure, In the minimum resonant structure, two resonators in the same row form a group, and the two resonators in the same row are mainly electrically coupled or magnetically coupled; the two resonators in the same column are electromagnetically mixed coupled; and the coupling polarities of the two groups of resonators in the two rows of resonant units are opposite, and at least one cross coupling is formed; The coupling polarity includes mainly electric coupling or mainly magnetic coupling; The cover plate is arranged on the resonant structure and includes a plurality of protrusions, wherein the protrusions are extended from the end surface of the cover plate close to the resonant structure toward the direction close to the resonant structure, and the setting position of the protrusions on the cover plate corresponds to the position of the resonant head of the resonator on the resonant structure.

2. The cross-coupled filter according to claim 1, characterized in that: In the resonant structure, two adjacent resonators in the same row are mainly electrically coupled or magnetically coupled; two adjacent resonators in the same column are coupled by electromagnetic hybrid coupling, and the coupling polarities of two adjacent groups of resonators in the same row are opposite and / or the coupling polarities of two adjacent groups of resonators in two adjacent rows are opposite, and at least one cross coupling is formed.

3. The cross-coupled filter according to claim 1, characterized in that: The multiple rows of resonance units are located on the same plane or arranged in layers.

4. The cross-coupled filter according to any one of claims 1 to 3, characterized in that: Each of the resonators includes a resonance head portion and a resonance tail portion opposite to each other, and a width of the resonance head portion is greater than a width of the resonance tail portion.

5. The cross-coupled filter according to claim 4, characterized in that: The resonant tails of two adjacent resonators in the same row are connected or opposite to each other, forming mainly magnetic coupling, or the resonant heads are opposite to each other, forming mainly electric coupling; the two adjacent resonators in the same column are arranged in parallel or approximately in parallel, and electromagnetic hybrid coupling is formed between the two adjacent resonators in the same column.

6. The cross-coupled filter according to claim 5, characterized in that: Two adjacent groups of resonators in two adjacent rows are arranged in a structural arrangement that is mainly electric coupling and mainly magnetic coupling, alternating between phases, so that the coupling polarities of the two adjacent groups of resonators in the two adjacent rows are opposite, and / or, multiple groups of resonators in the same row are arranged in a structural arrangement that is mainly electric coupling and mainly magnetic coupling, alternating between phases, so that the coupling polarities of the two adjacent groups of resonators in the same row are opposite.

7. The cross-coupled filter according to claim 1, characterized in that: The resonant structure further comprises a frame, and the resonant unit is integrally formed on the frame or assembled on the frame.

8. The cross-coupled filter according to claim 1, characterized in that: The cover plate includes at least one shielding wall, wherein: The shielding wall is located between two adjacent resonators.

9. The cross-coupled filter according to claim 1, characterized in that: The cross-coupling filter further includes at least one structural member for enhancing the cross-coupling amount between resonators, wherein the structural member connects two resonators to form a cross-coupling.

10. The cross-coupled filter according to claim 9, characterized in that: The filter also includes a plurality of tuning screws and a plurality of coupling adjustment screws. The tuning screws are located above the corresponding resonators and are used to adjust the resonant frequency of the resonators. The coupling adjustment screws are located between two adjacent resonators and are used to adjust the coupling amount between the resonators.

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