CN112350038A

CN112350038A - Cross coupling filter

Info

Publication number: CN112350038A
Application number: CN201910720331.5A
Authority: CN
Inventors: 李敦穁; 罗仁虎; 尹泽; 李强
Original assignee: Rosenberger Technology Kunshan Co Ltd
Current assignee: Rosenberger Technology Kunshan Co Ltd
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2021-02-09

Abstract

The invention discloses a cross-coupling filter, which comprises a minimum resonance structure, wherein the minimum resonance structure is formed by four resonators, in the minimum resonance 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; electromagnetic hybrid coupling is performed between two resonators in the same column; and the coupling polarities of the two groups of resonators of the two rows of resonance units are opposite, and at least one cross coupling is formed. The invention realizes miniaturization and light weight in structural characteristics, and realizes low loss and good harmonic characteristics in electrical performance.

Description

Cross coupling filter

Technical Field

The present invention relates to a filter, and more particularly, to a cross-coupled filter.

Background

Recent filter demand trends are toward miniaturization and demand for high quality, and particularly, communication components used in a small base station for 5G communication are smaller in size and more in demand than those used in previous macro base station products. Therefore, components used in the interior of the product must be high-quality, small-sized and lightweight, and have a structure suitable for mass production.

The filters currently used in small base stations are typically dielectric waveguide filters and conventional metal coaxial filters. The dielectric waveguide filter can be made smaller and lighter in weight and can be manufactured at a low cost, but is inferior in loss and harmonic characteristics to a metal coaxial filter. Compared with a dielectric waveguide filter, the traditional metal coaxial filter has good loss and harmonic characteristics, but the reduction of size and weight in design characteristics reaches a certain limit, the number of internal components also reaches a limit, and the purpose of reducing manufacturing cost cannot be achieved.

If the application number is: CN201710149229.5 discloses a filter of frame structure type, in which both sides of a rectangular frame are open, and a partition wall divides the inside of the frame into two spaces. Perpendicular to this partition wall, there is an integral resonator. The resonator is bent into an L-shape or a T-shape to reduce the space requirement, but such a form has a limitation in downsizing the filter, and it is difficult to satisfy the design requirement of the filter for a minute volume.

In the above-described structure, in order to form cross coupling, a sheet-like or wire-like conductor is added between non-adjacent resonators in the form of an open circuit or a short circuit, and it is necessary to fix an insulator to a frame or weld a conductor in the form of a wire to the resonators. Such a structure incurs processing cost and processing tolerance, and the frequency drift of the filter is large according to the environmental temperature when the frame and the resonator are of an integral structure.

As also described in application No.: CN 201910044005.7 discloses a filter in which resonators are bent multiple times to achieve miniaturization of the filter and cross-coupling can be achieved without additional structural members. However, this structure still has the following disadvantages: 1. although the resonator is advantageous for miniaturization by being bent many times, the insertion loss in the electrical performance of the filter is deteriorated due to a relatively low Q value; when a product is manufactured by opening the die, the size of the part is relatively smaller than that of a common filter, the part is bent, and the possibility of deformation exists during die-casting forming; 2. the harmonic characteristics of the frequency multiplication of 2 need to be improved.

As described in application No.: CN 201810540869.3 patent discloses a miniaturized filter, in which resonators are bent multiple times to achieve miniaturization of the filter, and the resonant rods are comb-shaped, extend in the same direction, and achieve cross coupling through coupling windows without additional structural members. However, this structure still has the following disadvantages: 1. although the resonator is advantageous for miniaturization by being bent many times, the insertion loss in the electrical performance of the filter is deteriorated due to a relatively low Q value; 2. in order to enhance the coupling amount between the resonant units of each layer, a window on the shielding layer needs to be opened greatly, which brings certain limit to increasing the bandwidth; 3. the initial direction of the resonator is single, and the transformation of the coupling form is limited.

Therefore, there is a need to provide a new filter with a small size and a light weight to solve the problems of the filter such as the deterioration of insertion loss and suppression degree in electrical performance, the possibility of deformation at the time of die casting, and the need for improvement of 2-fold harmonic.

Disclosure of Invention

The present invention is directed to overcoming the deficiencies of the prior art and providing a cross-coupled filter.

In order to achieve the purpose, the invention provides the following technical scheme: a cross coupling filter comprises a resonance structure, wherein the resonance structure comprises at least two rows of resonance units and at least two rows of resonance units, each row and each row of resonance units comprise at least two resonators, two adjacent resonators in any one row of resonance units in two adjacent rows of resonance units and two adjacent resonators in the other row and the two adjacent resonators in the same row respectively form a minimum resonance structure,

in the minimum resonance 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; electromagnetic hybrid coupling is performed between two resonators in the same column; the coupling polarities of the two groups of resonators of the two rows of resonance units are opposite, and at least one cross coupling is formed;

the coupling polarity comprises that the electric coupling is dominant or the magnetic coupling is dominant;

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 in an electromagnetic mixing mode, the coupling polarities of two adjacent resonators in the same row are opposite, and/or the coupling polarities of two adjacent resonators in two adjacent rows are opposite, and at least one cross coupling is formed.

Preferably, the plurality of rows of the resonance units are located on the same plane or are arranged in layers.

Preferably, the resonance tails of two adjacent resonators in the same row are connected or opposite to each other to form a magnetic coupling, or the resonance heads are opposite to each other to form an electric coupling; 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.

Preferably, two adjacent groups of resonators in two adjacent rows are distributed in a structure with alternating main electric coupling and main magnetic coupling so that the coupling polarities of the two adjacent groups of resonators in two adjacent rows are opposite, and/or multiple groups of resonators in the same row are distributed in a structure with alternating main electric coupling and main magnetic coupling so that the coupling polarities of the two adjacent groups of resonators in the same row are opposite.

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

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

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,

the lug boss extends from the end face, close to the resonance structure, of the cover plate to the direction close to the resonance structure, and the arrangement position of the lug boss on the cover plate corresponds to the position of the resonance head of the resonator on the resonance structure;

the shielding wall is positioned between two adjacent resonators.

Preferably, the cross-coupled filter further includes at least one structural member for enhancing the amount of cross-coupling between the resonators, the structural member connecting the two resonators forming the cross-coupling.

Preferably, the filter further comprises a plurality of tuning screws and a plurality of coupling tuning screws, the tuning screws being located above the respective resonators for adjusting the resonant frequencies of the resonators; the coupling adjusting screw is positioned between two adjacent resonators and used for adjusting the coupling amount between the resonators. .

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.

Preferably, the filter further includes a signal input port and a signal output port respectively provided at both ends of the signal transmission path.

Preferably, the filter is a resonator filter of order 4 or more.

The invention has the beneficial effects that:

1. the advantages of the dielectric waveguide filter and the metal coaxial filter are fused as much as possible, the miniaturization and the light weight are realized on the structural characteristic, and the low loss and the good harmonic characteristic are realized on the electrical property. And the number of the internal components of the filter is minimized as much as possible, so that the manufacturing cost is reduced, and the production engineering is simplified to be suitable for mass production.

2. The multi-row resonance units which are arranged in a layered mode or a single-layer mode are adopted, cross coupling is added among the rows, the coupling amount of the resonance units among the rows can be enhanced, transmission zero points are generated by the aid of coupling polarities opposite to those of the main channels in the cross-finger coupling mode, the filter can be designed in a miniaturized mode, and loss is improved.

3. The resonance structure of the filter can adopt an integral frame structure, the assembly is simple, the assembly tolerance consistency is good, and the stable product quality can be kept.

4. The shielding structure for adjusting the coupling quantity and improving the harmonic waves on the cavity can reduce the volume of the resonator, realize the miniaturization of the filter, improve the Q value of the resonator, and reduce the filter characteristics such as loss and the like.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 of the present invention;

FIG. 2 is a schematic view of the split structure of FIG. 1;

FIG. 3 is a schematic structural diagram of the resonant structure of FIG. 1;

FIG. 4 is a waveform diagram of simulation in embodiment 1 of the present invention;

FIG. 5 is a schematic structural view of embodiment 2 of the present invention;

FIG. 6 is a schematic structural view of embodiment 3 of the present invention;

FIG. 7 is a schematic structural view of embodiment 4 of the present invention;

FIG. 8 is a schematic structural view of embodiment 5 of the present invention;

FIG. 9 is a schematic structural view of embodiment 6 of the present invention;

FIG. 10 is a schematic view of a split structure in embodiment 7 of the present invention;

FIG. 11 is a schematic view of the construction of the cover plate of the present invention;

FIG. 12 is a schematic structural view of a resonance structure of embodiment 7 of the invention;

FIG. 13 is a waveform diagram of simulation in embodiment 7 of the present invention;

FIG. 14 is a schematic view of a split structure of embodiment 8 of the present invention;

FIG. 15 is a schematic structural view of a resonance structure of embodiment 8 of the invention;

FIG. 16 is a waveform diagram of simulation in embodiment 8 of the present invention;

fig. 17 is a schematic view showing a split structure of a filter (resonance structure alternative structure) of the present invention;

FIG. 18a is a schematic diagram of the 4 th order filter of the present invention;

FIG. 18b is a schematic diagram of the structure of the minimum resonant structure of FIG. 18a according to the present invention;

FIG. 18c is a simulated waveform diagram for a 4 th order filter of the present invention;

FIG. 19a is a schematic view of a split structure in example 9 of the present invention;

FIG. 19b is a schematic structural view of a resonant structure of embodiment 9 of the present invention;

fig. 19c is a simulation waveform diagram of embodiment 9 of the present invention.

Reference numerals:

1. the resonator comprises a resonant structure 12/12 a-12 h, a resonator 121, a resonant head 122, a resonant middle 123, a resonant tail 2, a first cover plate 21, a protruding part 22, a recessed part 23, a shielding wall 24, a connecting column 3, a second cover plate 4, a signal input port 5, a signal output port 6, a frame 61, a partition wall 62, a coupling window S1, a transmission loss waveform diagram S2, a return loss waveform diagram A, a minimum resonant structure 7, a tuning screw 8, a coupling tuning screw A and a minimum resonant structure.

Detailed Description

The technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.

As shown in fig. 1, the cross-coupled filter disclosed by the present invention includes a resonant structure 1, where the resonant structure 1 specifically includes a plurality of rows of resonant units and a plurality of columns of resonant units, and each row of resonant units and each column of resonant units further include a plurality of resonators 12. In practice, as shown in fig. 12, the resonant structure 1 may be an integral frame structure (i.e. the resonator is added with the frame 6 and connected into an integral form), and the frame-integrated resonant structure 1 has the advantages of simple assembly, good assembly tolerance consistency and capability of maintaining stable product quality. Or a split structure without a frame, as shown in fig. 1 and 17, the multiple rows of resonance unit split bodies of the resonance structure 1 are fixed in a frame 6 (for example, by fixing members such as screws).

In addition, the multiple rows of resonant cells of the resonant structure 1 can be located on the same plane, i.e., on the same layer, when implemented, and the structure can greatly reduce the size of the filter in the height direction. It is also possible to arrange several rows of resonator elements in layers, i.e. not in the same plane. As shown in fig. 1 and 2, each row of resonant units is vertically fixed in the frame 6, and the multiple rows of resonant units are arranged in parallel in the longitudinal direction of the frame 6 (i.e., in the front-rear direction of the frame 6); as shown in fig. 6, 9, 10, and 15, the plurality of rows of resonant units are located on the same plane.

As shown in fig. 5, 8 and 9, the minimum resonance structure a of the filter of the present invention is a 4-order filter, and specifically, the minimum resonance structure a is composed of two rows of adjacent resonance units and two columns of adjacent resonance units, where each row of resonance units and each column of resonance units have two resonators. In the implementation, the filter may be directly the minimum resonance structure a, that is, the filter is a 4-order filter, or the minimum resonance structure a is formed in other multi-order (e.g., 6-order, 8-order, etc.) filters higher than 4-order, and the position of the minimum resonance structure a in the filter is not limited, specifically, in two adjacent rows of resonance units, two adjacent resonators in any one row of resonance units and two adjacent resonators in the other row and the two adjacent resonators in the same column respectively form the minimum resonance structure.

In practice, the coupling polarity, arrangement, etc. between other resonators 12 in the filter except for the minimum resonant structure a may not be limited in the present invention.

In addition, the shape design of the resonators 12 and their arrangement within the frame 6 determine the manner of coupling between the resonators 12. In this embodiment, as shown in fig. 1, each resonator 12 is a cylindrical structure as a whole, and specifically includes a resonant head 121, a resonant middle 122, and a resonant tail 123, where the resonant head 121 is a portion of the resonator 12 with the strongest electric coupling strength, and conversely, the resonant tail 123 is a portion of the resonator 12 with the strongest magnetic coupling strength. Preferably, the width of the resonance head 121 is wider than the widths of the resonance middle 122 and the resonance tail 123, so that the volume of the resonator 12 can be further reduced under the same frequency requirement. Of course, resonator structures having multiple bends are equally applicable to the present invention.

The plurality of rows of resonators 12 are arranged along a signal transmission path in the frame 6, and the signal transmission path may be U-shaped or S-shaped, or a curved path formed by a plurality of consecutive U-shaped or S-shaped resonators. The coupling manner of two adjacent resonators 12 on the signal transmission path is determined by the shape and mutual arrangement position of the two. 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, and when the coupling amount of one of the two couplings is much larger than that of the other, the larger one is called dominant coupling, and the mode of dominant coupling 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 resonance head, the main coupling is mainly electric coupling, if the coupling amount of the two is mainly generated by the resonance tail, the main coupling is magnetic coupling, and if the magnitude difference between the electric coupling amount and the magnetic coupling amount is not large, the electromagnetic hybrid coupling is realized.

When the resonators in the same row are transversely arranged, the resonators in the same column are longitudinally arranged, and signals can be transmitted along one direction (namely, transversely or longitudinally); when the resonators in the same row are longitudinally arranged, the resonators in the same column are transversely arranged, and signals can also be transmitted along one direction firstly.

As shown in fig. 18a, the filter is a 4-order filter, and specifically includes a first cover plate 2, a second cover plate 3, and a minimum resonance structure, where, as shown in fig. 18b, the minimum resonance structure is composed of two rows of resonance units and two columns of resonance units, that is, includes 4 resonators, which are respectively defined as 12a, 12b, 12c, and 12d, and at this time, the same row is a resonator arranged in the transverse direction, the same column is a resonator arranged in the longitudinal direction, and signals are transmitted along the longitudinal direction first. The two resonators 12 in the same row of the minimum resonant structure are mainly electrically coupled or magnetically coupled. In the minimum resonance structure shown in fig. 18a, the

resonators

12a and 12d in the same row are mainly electrically coupled, and the

resonators

12b and 12c in the same row are mainly magnetically coupled.

For convenience of description, two resonators 12 in the same row in this embodiment are defined as one group. And two adjacent resonators 12 in the same column are electromagnetically and mixedly coupled, and the coupling polarities of the two groups of resonators 12 in the two rows of resonance units are opposite. The coupling polarities include the above-mentioned electric coupling and magnetic coupling, that is, the coupling polarities of the two groups of resonators 12 of 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 rows of resonators 12 of the two rows of resonance units, as shown in fig. 18 c.

As shown in fig. 5, 8 and 9, in a specific embodiment, when the resonators arranged in the same row are arranged in the transverse direction, the resonators arranged in the same column are arranged in the longitudinal direction, and signals are transmitted along the transverse direction first, the two resonators 12 in the same row of the minimum resonant structure a are mainly electrically coupled or magnetically coupled, and for convenience of description, the two resonators 12 in the same row in this embodiment are defined as a group. And two adjacent resonators 12 in the same column are electromagnetically and mixedly coupled, and the coupling polarities of the two groups of resonators 12 in the two rows of resonance units are opposite. The coupling polarities include the above-mentioned electric coupling and magnetic coupling, that is, the coupling polarities of the two groups of resonators 12 of 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 rows of resonators 12 of the two rows of resonance units.

Specifically, in this embodiment, the resonance tails 123 of two resonators 12 in the same row of the minimum resonance structure a are connected or opposite to each other, or the resonance heads 121 are arranged oppositely to each other, and when the resonance tails 123 are connected or opposite to each other, the coupling formed is mainly magnetic coupling; when the resonant heads 121 are oppositely arranged, the coupling is mainly electrical coupling. The two resonators 12 in the same column are arranged in parallel or approximately in parallel, but the directions of the resonance heads 121 or the resonance tails 123 of the two resonators are opposite, and if the resonance head 121 of one resonator 12 faces to the left, the resonance head 121 of the other resonator faces to the right, of course, the two resonators 12 in the same column are not limited to the arrangement structure in which the resonators face opposite directions, as long as the electromagnetic hybrid coupling of the two resonators can be realized. 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 oppositely to form a mainly electric coupling, and the resonance tails 123 of the two resonators (i.e., the other group of resonators) in the other row are connected or opposite to form a mainly magnetic coupling, the two groups of resonators 12 of the two rows of resonance units are not limited to the arrangement structure described herein, as long as the two adjacent groups of resonators in the two adjacent rows are distributed in a structure in which the mainly electric coupling and the mainly magnetic coupling are alternated.

In addition, the other resonators 12 in the filter may be extended according to the coupling manner between the resonators 12 in this embodiment, and extended to have 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 coupled by electromagnetic mixing, the coupling polarities of two adjacent resonators 12 in the same row are opposite and/or the coupling polarities of two adjacent resonators 12 in two adjacent rows are opposite, and at least one cross coupling is formed in the resonators 12 in multiple columns of the multiple rows of resonance units.

As shown in fig. 12 and fig. 15, in another specific alternative embodiment, when the resonators arranged in the same row are arranged in the transverse direction and the resonators arranged in the same column are arranged in the longitudinal direction, and the signal starts to transmit along the longitudinal direction, the electromagnetic hybrid coupling between two resonators 12 in the same column of the minimum resonant structure a, that is, the electric coupling and the magnetic coupling of two adjacent resonators 12 reach the value of forming the electromagnetic hybrid coupling. Two adjacent resonators 12 in the same row are mainly electrically coupled or magnetically coupled, and for convenience of description, two resonators 12 in the same row are defined as a group in this embodiment. And the coupling polarities of the two groups of resonators 12 of the two rows of resonance units are opposite. In addition, at least one cross coupling is formed in the two rows of resonators 12 of the two rows of resonance units.

Specifically, two resonators 12 in the same column are arranged in parallel or approximately in parallel, but the resonant heads 121 or the resonant tails 123 of the two resonators are oriented oppositely; the resonance tail parts 123 of the two resonators in the same row are connected or the resonance head parts 121 are oppositely arranged; the arrangement of the two groups of resonators 12 of the two rows of resonance units is the same as the above explanation, and is not described herein.

Similarly, the other resonators 12 in the filter may also be extended according to the coupling manner between the resonators 12 in this alternative embodiment, so as to extend into a filter structure having at least two rows and at least two columns of resonators 12. Specifically, two adjacent resonators 12 in the same column are all electromagnetically mixed and coupled; the adjacent two resonators 12 in the same row are mainly electrically coupled or magnetically coupled, and the coupling polarities of the two adjacent groups of resonators 12 in the same row are opposite and/or the coupling polarities of the 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 on the left and right sides of the bandwidth, respectively, and the number of cross-couplings can be increased to increase the number of zeros according to the number of resonators 12. The cross coupling between the resonators 12 of the present invention can be achieved without additional structural members, but additional structural members (such as metal rods, insulators, and other supporting members, not shown) can be added between two adjacent resonators 12 forming the cross coupling according to circumstances, so as to further increase the amount of cross coupling.

Further, the filter further includes a cover plate disposed on the resonance structure, a closed filtering cavity is formed between the cover plate and the resonance structure, in implementation, the cover plate may include a first cover plate 2 and a second cover plate 3 respectively covering end surfaces on two sides of the resonance structure, the structures of the first cover plate 2 and the second cover plate 3 are substantially the same, the structure of the first cover plate 2 is specifically described herein, and the second cover plate 3 is not described in detail, which can refer to the description of the first cover plate 2 below. As shown in fig. 11, the first cover plate 2 includes a plurality of protrusions 21 disposed on a lower end surface thereof, i.e., a surface adjacent to the resonant structure 1, at least one shielding wall 23, and at least one connection post 24. The protruding portion 21 extends from the lower end surface of the first cover plate 2 toward the direction close to the resonant structure 1, and the position of the protruding portion 21 on the first cover plate 2 corresponds to the position of the resonant head 121 of the resonator 12, that is, the protruding portion 21 is disposed on the lower end surface of the first cover plate 2 corresponding to the position of the resonant head 121 of the resonator, so that the distance between the first cover plate 2 and the resonant head 121 of the resonator 12 is shortened, because the closer to the resonator 12, the larger the distributed capacitance is, the lower the resonant frequency is, so that the length of the resonator can be effectively shortened, and the size of the filter can be relatively reduced, thereby realizing the miniaturization of the filter.

The first cover 2 is formed with a plurality of recesses 22 corresponding to the protrusions 21, and the recesses 22 are formed at positions on the first cover 2 corresponding to the positions of the resonance tails 123 of the resonators 12, that is, the recesses 22 are formed at positions on the lower end surface of the first cover 2 corresponding to the positions of the resonance tails 123 of the resonators 12, so that the space between the resonance tails 123 and the first cover 2 is enlarged.

The shielding wall 23 is disposed between two adjacent resonators 12 for adjusting the coupling strength between the two resonators 12, although the coupling strength between the resonators 12 can be adjusted by the distance between the resonators 12, this may result in a larger filter volume, and the provision of the shielding wall 23 does not affect the filter volume based on the adjustable coupling strength between the resonators 12.

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 provision of the connecting studs 24 improves the harmonic characteristics of the filter. The attachment posts 24 are implemented on either the first cover plate or the second cover plate.

In addition, as shown in fig. 1 and 2, the frame 6 may further include a plurality of tuning screws 7, which pass through the upper end surface of the frame 6 and extend into the upper side of the corresponding resonator 12 at the lower end thereof, for adjusting the resonant frequency of the resonator 12; and a coupling adjusting screw 8 which penetrates through the upper end surface of the filter frame 6 and the lower end of which extends into the space between two adjacent resonators 12 and is used for adjusting the coupling amount between the resonators 12.

The signal input port 4 and the signal output port 5 are respectively provided at both ends of the above-mentioned signal transmission path, and the arrangement positions thereof may be different according to the difference of the signal transmission path.

The following description will be made of the structure of the cross-coupled filter of the present invention in terms of several embodiments.

Example 1

Referring to fig. 1 to 3, a cross-coupled filter according to embodiment 1 of the present invention includes 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 front and rear side surfaces of a frame 6, so as 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 are not described again here. The structure of the lower resonant structure 1 will be described in detail below.

As shown in fig. 3, the filter formed by the resonant structure 1 of embodiment 1 of the present invention is a 6-order filter, which includes two rows of resonant units, where the two rows of resonant units are not on the same plane, and specifically, are layered along the front-back direction of the frame 6. Each row of resonance units is vertically arranged in the frame 6 (i.e. in the up-down direction of the frame 6), and each row of resonance units includes 3 resonators 12, i.e. 6 resonators 12 are arranged in the frame, and for convenience of description, the 6 resonators are defined as resonator 12a and resonator 12b … … resonator 12f, where resonator 12a to resonator 12c are in a row, and resonator 12d to resonator 12f are in a row. The structure of each resonator is as described above and will not be described in detail here.

The 6 resonators are arranged in the frame along a U-shaped signal transmission path, specifically, a signal is input from the resonator 12a, sequentially passes through the resonators 12b to 12e, and is finally output from the resonator 12f, that is, the signal input port of this embodiment 1 is electrically connected to the resonator 12a, and the signal output port is electrically connected to the resonator 12 f.

Wherein, an electric coupling is mainly formed and a magnetic coupling is mainly formed between the

resonators

12a and 12b, and between the

resonators

12b and 12c in the same row, that is, the electric coupling is mainly formed and the magnetic coupling is mainly formed; an alternating coupling in which the electric coupling is dominant and the magnetic coupling is dominant, that is, the electric coupling is dominant and the magnetic coupling is dominant, is formed between the

resonators

12d and 12e in the same row and between the

resonators

12e and 12f, respectively.

The

resonators

12a and 12f, the

resonators

12b and 12e, and the

resonators

12c and 12d in the same column are all electromagnetically mixed coupled, and the coupling polarity (specifically, the electric coupling is dominant) between the

resonators

12a and 12b in the two rows is opposite to the coupling polarity (specifically, the magnetic coupling is dominant) between the

resonators

12f and 12e, and the coupling polarity (specifically, the magnetic coupling is dominant) between the

resonators

12b and 12c in the two rows is opposite to the coupling polarity (specifically, the electric coupling is dominant) between the

resonators

12e and 12 d.

And cross coupling (defined as first cross coupling) is generated between the

resonators

12b and 12e in the same column. Cross coupling (defined as second cross coupling) is also generated between the

resonators

12a and 12f in the same column, that is, two cross couplings are formed in the filter of this embodiment 1, and each cross coupling generates one transmission zero on the left and right sides of the bandwidth, so that four transmission zeros are generated in total, as shown in fig. 4.

Specifically, the resonance tail of the resonator 12a faces the left side wall of the frame 6 and is fixed to the frame by a fixing screw, the resonance head is opposite to the resonance head of the resonator 12b, the resonance tail of the resonator 12b is connected to the resonance tail of the resonator 12c, and the resonance head of the resonator 12c faces the right side wall of the frame 6. The resonator 12d of the other row has a resonant tail facing the right side wall of the frame 6 and a resonant head opposite 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. Thus, 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 are oriented in opposite directions.

Preferably, a partition wall 61 is further disposed in the frame 6 between the two rows of resonant cells, and at least one coupling window 62 is disposed on the partition wall for coupling the two rows of resonant cells.

Example 2

As shown in fig. 5, a cross-coupled filter according to embodiment 2 of the present invention is an alternative implementation of embodiment 1, and the filter formed by the resonant structure 1 according to embodiment 2 of the present invention is also a 6-order filter, and includes two rows of resonant units, where the two rows of resonant units are not on the same plane, and specifically are layered along the front-back direction of the frame. Unlike embodiment 1, the resonator 12a, the resonator 12b, the resonator 12f, and the resonator 12e in embodiment 2 constitute the minimum resonance structure a described above. In the minimum resonance structure a, the

resonators

12a and 12b in the same row are mainly electrically coupled, the

resonators

12f and 12e in the same row are mainly magnetically coupled, and cross coupling occurs between the

resonators

12a and 12 f.

The coupling mode of the other resonators except for the minimum resonance structure a is not limited.

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

Example 3

As shown in fig. 6, a cross-coupled filter according to embodiment 3 of the present invention is also an alternative to embodiment 1 described above. Different from embodiment 1, the two rows of resonant units in embodiment 3 are located on the same plane, and the arrangement structure and the coupling manner of the other 6 resonators are the same as those in embodiment 1, and are not described herein again.

Example 4

The cross-coupling filter of embodiment 4 of the present invention includes a resonant structure 1, a frame 6, a signal input port 4, and a signal output port 5, where the resonant structure 1 is separately installed in the frame 6. The structure of the lower resonant structure 1 will be described in detail below.

As shown in fig. 7, the filter formed by the resonant structure 1 of embodiment 4 of the present invention is an 8-order filter, which includes two rows of resonant units, where the two rows of resonant units are not on the same plane, and specifically, are layered along the front-back direction of the frame 6. Each row of resonance units is vertically arranged in the frame 6 (i.e. in the up-down direction of the frame 6), and each row of resonance units includes 4 resonators 12, i.e. 8 resonators 12 are arranged in the frame 6, and for convenience of description, the 8 resonators are defined as resonator 12a and resonator 12b … … resonator 12h, where the resonators 12a to 12d are in a row, and the resonators 12e to 12h are in a row. The structure of each resonator is as described above and will not be described in detail here.

The 8 resonators are arranged in the frame according to a U-shaped signal transmission path, specifically, a signal is input from the resonator 12a, sequentially passes through the resonators 12b to 12g, and is finally output from the resonator 12h, that is, the signal input port 4 of this embodiment 4 is electrically connected to the resonator 12a, and the signal output port 5 is electrically connected to the resonator 12 h.

Magnetic coupling, mainly magnetic coupling and mainly electric coupling, namely alternative coupling mainly magnetic coupling and mainly electric coupling are respectively formed between the

resonators

12a and 12b, between the

resonators

12b and 12c, between the

resonators

12c and 12d in the same row; alternate couplings mainly including electric coupling, magnetic coupling and electric coupling, that is, mainly including electric coupling and magnetic coupling, are formed between the

resonators

12h and 12g, between the

resonators

12g and 12f, and between the

resonators

12f and 12e in the same row, respectively.

Electromagnetic hybrid coupling is provided between the

resonators

12a and 12h, between the

resonators

12b and 12g, between the

resonators

12c and 12f, and between the

resonators

12d and 12e in the same column, and the polarity of coupling (specifically magnetic coupling is dominant) between the

resonators

12a and 12b in the two banks is opposite to the polarity of coupling (specifically electrical coupling is dominant) between the resonator 12h and the resonator 12g, and the coupling polarity (specifically, the electric coupling is dominant) between the resonator 12b and the resonator 12c located in the two banks is opposite to the coupling polarity (specifically, the magnetic coupling is dominant) between the resonator 12g and the resonator 12f, and the coupling polarity (specifically, the magnetic coupling is dominant) between the resonator 12c and the resonator 12d located in the two banks is opposite to the coupling polarity (specifically, the magnetic coupling is dominant) between the resonator 12f and the resonator 12 e.

And cross coupling (defined as first cross coupling) is generated between the

resonators

12c and 12f of the same column. Cross coupling (defined as second cross coupling) also occurs between the

resonators

12b and 12g in the same column. Cross coupling (defined as third cross coupling) is also generated between the

resonators

12a and 12h in the same column, that is, three cross couplings are formed in the filter of this embodiment 4, and each cross coupling generates one transmission zero on the left and right sides of the bandwidth, thereby generating six transmission zeros in total, as shown in fig. 7.

Specifically, the resonance head of the resonator 12a faces the left side wall of the frame 6, 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 resonator 12e of the other row has a resonance tail facing the right side wall of the frame 6, a resonance head facing the resonance head of the resonator 12f, the resonance tail of the resonator 12f being connected to the resonance tail of the resonator 12g, the resonance head of the resonator 12g facing the resonance head of the resonator 12h, and the resonator 12h facing 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 are oriented in opposite directions.

Also, preferably, a partition wall 6 is disposed in the frame 6 between the two rows of resonant cells, and at least one coupling window 61 for coupling the two rows of resonant cells is disposed on the partition wall 6.

Example 5

As shown in fig. 8, a cross-coupled filter according to embodiment 5 of the present invention is an alternative implementation of embodiment 4, and the filter formed by the resonant structure 1 according to embodiment 4 of the present invention is also an 8-order filter, and includes two rows of resonant units, where the two rows of resonant units are not on the same plane, and specifically are layered along the front-back direction of the frame. Unlike embodiment 4, the resonator 12a, the resonator 12b, the resonator 12h, and the resonator 12g in embodiment 5 constitute the above-described minimum resonance structure a. In the minimum resonance structure a, the

resonators

12a and 12b in the same row are mainly electrically coupled, and the

resonators

12h and 12g in the same row are mainly magnetically coupled.

In addition to the minimum resonance 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 coupled to each other, and the

resonators

12b and 12c in the same row are mainly magnetically coupled to each other.

Specifically, the resonance tail of the resonator 12a faces the left side wall of the frame 6, the resonance head is opposite to the resonance head of the resonator 12b, the resonance tail of the resonator 12b is connected to the resonance tail of the resonator 12c, the resonance head of the resonator 12c is opposite to the resonance head of the resonator 12d, and the resonator 12d faces the right side wall of the frame 6. The resonator 12e has a resonance head facing the right side wall of the frame 6, the resonance head being opposite to the resonance head of the resonator 12f, the resonance tail of the resonator 12f being opposite to the resonance head of the resonator 12g, the resonance tail of the resonator 12g being connected to the resonance tail of the resonator 12h, and the resonance tail of the resonator 12h facing the left side wall of the frame 6.

Example 6

As shown in fig. 9, a cross-coupled filter according to embodiment 6 of the present invention is an alternative to embodiment 5. Different from embodiment 5, the two rows of resonant units in this embodiment 6 are located on the same plane, and the arrangement structure and the coupling manner of the other 6 resonators are the same as those in embodiment 1, which is not described herein again.

Example 7

Referring to fig. 10 to 12, a cross-coupled filter according to embodiment 7 of the present invention includes a resonant structure, and the resonant structure 1 is an integral frame structure. The structure of the lower resonant structure 1 will be described in detail below.

The filter formed by the resonant structure 1 of embodiment 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 2 resonators 12, that is, 6 resonators 12 are disposed in the frame, and for convenience of description, the 6 resonators are defined as resonator 12a and resonator 12b … … resonator 12f, respectively, where resonator 12a and resonator 12f are in a row, resonator 12b and resonator 12e are in a row, and resonator 12c and resonator 12d are in a row. The structure of each resonator is as described above and will not be described in detail here.

The three rows of resonators 12 are distributed in the frame in the front-rear direction of the front and rear side walls of the frame 6. And 6 resonators are arranged in the frame according to a U-shaped signal transmission path, specifically, a signal is input from the resonator 12a, sequentially passes through the resonators 12b to 12e, and is finally output from the resonator 12f, that is, the signal input port of this embodiment 1 is electrically connected to the resonator 12a, and the signal output port is electrically connected to the resonator 12 f.

Wherein, the

resonators

12a and 12b in the same column, the

resonators

12b and 12c in the same row are electromagnetically mixed coupled, 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 coupled, the cross coupling (defined as the first cross coupling) generated between the

resonators

12b and 12e in the same row is mainly magnetically coupled, the cross coupling (defined as the second cross coupling) between the

resonators

12a and 12f in the same row is mainly electrically coupled, and the magnetic coupling between the

resonators

12b and 12e is mainly opposite, that is, the electrical couplings between the

resonators

12c and 12d, the

resonators

12b and 12e, and the

resonators

12a and 12f are mainly electrically coupled, respectively, The magnetic coupling is dominant and the electrical coupling is dominant, i.e. an alternating coupling in which the electrical coupling is dominant and the magnetic coupling is dominant. This embodiment 1 forms two cross-couplings, each of which generates one transmission zero on the left and right sides of the bandwidth, thereby generating four transmission zeros in total, as shown in fig. 13.

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, a coupling gap is provided 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 resonator 12b and the resonance tail 123 of the resonator 12e are connected and integrally formed with the rear side wall of the frame 6, and a coupling window is arranged on the connection part of the resonator 12b and the resonator 12e with the rear side wall of the frame 6 for cross coupling between the resonator 12a and the resonance head 121 of the resonator 12f, and the resonance head 121 faces the left side wall and the right side wall of the frame 6 respectively and is not in contact with the left side wall and the right side wall; the resonance tail 123 of the resonator 12c is integrally formed with the left side wall of the frame 6, the resonance head 121 is opposed to the resonance head 121 of the resonator 12d with a coupling gap between the two resonance heads 121, and the resonance tail 123 of the resonator 12d is integrally formed with the right side wall of the frame 6.

Preferably, in order to increase the amount of cross-coupling between the resonator 12a and the resonator 12f, the above-described additional structural members connecting the resonator 12a and the resonator 12f may be added to increase the amount of coupling therebetween, as the case may be.

Example 8

Referring to fig. 14 and 15, a cross-coupled filter according to embodiment 8 of the present invention includes 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, where the filter formed by the resonant structure according to embodiment 5 of the present invention is an 8-order filter, which includes a frame 6 and two rows of resonant units integrally formed in the frame 6, each row of resonant units includes 4 resonators, that is, 8 resonators are disposed in the frame, and referring to fig. 15, for convenience of description, the 8 resonators are defined as a resonator 12a and a resonator 12b … … resonator 12h, where the resonator 12a, the resonator 12d, the resonator 12e, and the resonator 12h are in a row, and the resonator 12b, the resonator 12c, the resonator 12f, and the resonator 12g are in a row. The structure of each resonator is as described above and will not be described in detail here.

The two rows of resonators are distributed in the frame along the front-back direction of the front and back side walls of the frame. And 8 resonators are arranged in the frame in a plurality of signal transmission paths formed in a continuous S-shape, specifically, a signal is input from the resonator 12a, sequentially passes through the resonators 12b to 12g, and is finally output from the resonator 12h, that is, the signal input port of this embodiment 5 is electrically connected to the resonator 12a, and the signal output port is electrically connected to the resonator 12 h.

Electromagnetic hybrid coupling is respectively performed between the

resonators

12a and 12b in the same column, between the

resonator

12c and 12d, between the

resonator

12e and 12f, and between the

resonator

12g and 12h, magnetic coupling is mainly performed between the

resonators

12b and 12c in the same row, cross coupling (defined as first cross coupling) generated between the resonator 12a and the resonator 12d is mainly performed by electric coupling, and magnetic coupling between the resonator 12b and the resonator 12c is mainly opposite to that between the resonator 12b and the resonator 12 c; the resonator 12f and the resonator 12g in the same row are mainly magnetically coupled, and the cross coupling (defined as the second cross coupling) generated between the resonator 12e and the resonator 12h is mainly electrically coupled, which is mainly opposite to the magnetic coupling between the resonator 12f and the resonator 12 g. That is, a magnetic coupling, a primary electric coupling, and a primary electric coupling are formed between the resonator 12b and the resonator 12c, between the resonator 12a and the resonator 12d, between the resonator 12d and the resonator 12e, between the resonator 12c and the resonator 12f, between the resonator 12f and the resonator 12g, and between the resonator 12e and the resonator 12h, respectively, that is, the magnetic coupling and the electric coupling are alternately coupled. This embodiment 8 forms two cross-couplings, each of which generates one transmission zero on the left and right sides of the bandwidth, thereby generating four transmission zeros in total, as shown in fig. 16.

Specifically, the tail 123 of the resonator 12a is integrally formed with the left side wall of the frame 6, the head 121 of the resonator 12d is opposite to the head 121 of the resonator 12d, a coupling gap is formed between the two heads 121, and a shielding wall for adjusting the electrical coupling amount between the two heads 121 of the resonator 12a and the resonator 12d is further disposed between the two heads. The resonator 12b is connected to the two resonant tail portions 123 of the resonator 12c and is integrally formed with the front side wall of the frame 6, with the resonant head portions 121 thereof facing in opposite directions. The resonant tail 123 of the resonator 12d is connected to the resonant tail 123 of the resonator 12e and is integrally formed with the front side wall of the frame 6 with the resonant heads 123 of the two facing oppositely. The resonance head 121 of the resonator 12c is opposed to the resonance head 121 of the resonator 12f, and is separated by a connection 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, with the resonant heads 121 of the two facing oppositely. The resonating head 121 of the resonator 12e is opposite to the resonating head 121 of the resonator 12h, a coupling gap is formed between the two resonating heads 121, and a shielding wall 23 for adjusting the electrical coupling amount of the two resonating heads 121 is further disposed between the two resonating heads 121.

Example 9

Referring to fig. 19a and 19b, a cross-coupled filter according to embodiment 9 of the present invention includes a resonant structure 1, a first cover plate 2, and a frame 6, wherein the first cover plate 2 covers front and rear side surfaces of the frame 6, so as 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 lower resonant structure 1 will be described in detail below.

As shown in fig. 19b, the filter formed by the resonant structure 1 of embodiment 9 of the present invention is an 8-order filter, which includes two rows of resonant units, and the two rows of resonant units are disposed on the same plane, specifically, along the front-back direction of the frame 6. Each row of resonance units includes 4 resonators 12, that is, 8 resonators 12 are disposed in the frame, and for convenience of description, the 8 resonators are defined as resonator 12a and resonator 12b … … resonator 12h, where resonator 12a to resonator 12d are in a row, and resonator 12e to resonator 12h are in a row. The structure of each resonator is as described above and will not be described in detail here.

The 8 resonators are arranged in the frame according to a U-shaped signal transmission path, specifically, a signal is input from the resonator 12a, sequentially passes through the resonators 12b to 12g, and is finally output from the resonator 12h, that is, the signal input port of this embodiment 9 is electrically connected to the resonator 12a, and the signal output port is electrically connected to the resonator 12 h.

Wherein, the electric coupling is mainly and the magnetic coupling is mainly formed between the resonator 12a and the resonator 12h, and between the resonator 12b and the resonator 12g in the same column, that is, the electric coupling is mainly and the magnetic coupling is mainly alternate coupling; the

resonators

12c and 12f in the same column and the

resonators

12d and 12e in the same column form alternate coupling mainly including electric coupling and magnetic coupling, that is, mainly including electric coupling and magnetic coupling.

The electromagnetic hybrid coupling is performed between the

resonators

12a and 12b, between the

resonators

12b and 12c, and between the

resonators

12c and 12d in the same row, and the coupling polarity (specifically, the electric coupling is dominant) between the

resonators

12a and 12h in the two rows is opposite to the coupling polarity (specifically, the magnetic coupling is dominant) between the

resonators

12b and 12g, and the coupling polarity (specifically, the electric coupling is dominant) between the

resonators

12c and 12f in the two rows is opposite to the coupling polarity (specifically, the magnetic coupling is dominant) between the

resonators

12d and 12 e.

And cross coupling (defined as first cross coupling) is generated between the

resonators

12c and 12f of the same column. Cross coupling (defined as second cross coupling) is also generated between the resonator 12b and the resonator 12g in the same column, and cross coupling (defined as third cross coupling) is also generated between the resonator 12a and the resonator 12h in the same column, that is, three cross couplings are formed in the filter of this embodiment 9, and each cross coupling generates one transmission zero on the left and right sides of the bandwidth, respectively, so that six transmission zeros are generated in total, as shown in fig. 19 c.

Specifically, the resonance tail of the resonator 12a faces the rear side wall of the frame 6 and is fixed to the frame by a fixing screw, the resonance head is opposite to the resonance head of the resonator 12h, and the resonance tail of the resonator 12h faces the front side wall of the frame 6 and is fixed to the frame by a fixing screw; 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 resonance tail part of the resonator 12c is fixed on the rear side wall of the frame 6, the resonance head part is opposite to the resonance head part of the resonator 12f, and the resonance tail part of the resonator 12f is fixed on the front side wall of the frame 6; the resonance tail of the resonator 12d is connected to the resonance tail of the resonator 12h, and the resonance heads of the resonator 12d and the resonator 12e face the rear side wall and the front side wall of the frame 6, respectively. Thus, the

resonators

12a and 12b, the

resonators

12b and 12c, and the

resonators

12c and 12d in the same row are oriented oppositely; the

resonators

12e and 12f, the

resonators

12f and 12g, and the

resonators

12g and 12h in the same row are oriented oppositely.

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

Therefore, the scope of the present invention should not be limited to the disclosure of the embodiments, but includes various alternatives and modifications without departing from the scope of the present invention, which is defined by the claims of the present patent application.

Claims

1. A cross-coupled filter, comprising:

the resonance structure comprises at least two rows of resonance units and at least two rows of resonance units, each row and each row of resonance units comprise at least two resonators, wherein two adjacent resonators in any one row of resonance units in two adjacent rows of resonance units and two adjacent resonators in the same row with the two adjacent resonators in the other row respectively form a minimum resonance structure,

the coupling polarity includes either an electrical coupling being dominant or a magnetic coupling being dominant.

2. The cross-coupled filter of claim 1, wherein in the resonant structure, two adjacent resonators in the same row are mainly coupled electrically or magnetically; two adjacent resonators in the same column are coupled in an electromagnetic mixing mode, the coupling polarities of two adjacent resonators in the same row are opposite, and/or the coupling polarities of two adjacent resonators in two adjacent rows are opposite, and at least one cross coupling is formed.

3. The cross-coupled filter of claim 1, wherein the multiple rows of the resonant cells are located on the same plane or are arranged in layers.

4. The cross-coupled filter of any of claims 1-3, wherein each resonator comprises opposing resonating heads and resonating tails, the resonating heads having a width greater than a width of the resonating tails.

5. The cross-coupled filter of claim 4, wherein the resonance tails of two adjacent resonators in the same row are connected or opposite to each other to form a magnetic coupling, or the resonance heads are opposite to each other to form an electric coupling; 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 of claim 5, wherein the two adjacent groups of resonators in two adjacent rows are distributed in a structure with alternating primary electric coupling and primary magnetic coupling so that the coupling polarities of the two adjacent groups of resonators in two adjacent rows are opposite, and/or the groups of resonators in the same row are distributed in a structure with alternating primary electric coupling and primary magnetic coupling so that the coupling polarities of the two adjacent groups of resonators in the same row are opposite.

7. The cross-coupled filter of claim 1, wherein the resonating structure further comprises a frame, and the resonating units are integrally formed on the frame or assembled on the frame.

8. The cross-coupled filter of claim 1, further comprising a cover plate disposed over the resonating structure, the cover plate comprising a plurality of bosses and at least one shielding wall, wherein,

the shielding wall is positioned between two adjacent resonators.

9. The cross-coupled filter of claim 1, further comprising at least one structural member for enhancing the amount of cross-coupling between the resonators, the structural member connecting the two resonators forming the cross-coupling.

10. The cross-coupled filter of claim 9, further comprising a plurality of tuning screws and a plurality of coupling tuning screws, the tuning screws being located above the respective resonators for adjusting the resonant frequencies of the resonators; the coupling adjusting screw is positioned between two adjacent resonators and used for adjusting the coupling amount between the resonators.