CN116417770B

CN116417770B - Filter, capacitive coupling structure and adjusting method thereof

Info

Publication number: CN116417770B
Application number: CN202310680759.8A
Authority: CN
Inventors: 朱旭; 吴精强; 丁海; 贺斌; 郭春波
Original assignee: Comba Telecom Technology Guangzhou Ltd; Jingxin RF Technology Guangzhou Co ltd
Current assignee: Comba Telecom Technology Guangzhou Ltd; Jingxin RF Technology Guangzhou Co ltd
Priority date: 2023-06-09
Filing date: 2023-06-09
Publication date: 2023-09-29
Anticipated expiration: 2043-06-09
Also published as: CN116417770A

Abstract

The application relates to a filter, a capacitive coupling structure and an adjusting method thereof. Each resonator is arranged in a mode of combining a resonant rod with a resonant plate, the resonant rod is adjacent to the side wall of the metal resonant cavity, the resonant plate is arranged opposite to the top wall of the metal resonant cavity at intervals, the arrangement directions of the resonant plates of the two adjacent resonators are opposite, and according to the research, the capacitive coupling can be realized by arranging the two side parts of the two resonant plates adjacent to each other at intervals, the capacitive coupling quantity of the two resonators can meet the requirement by adjusting the interval between the two resonant plates, so that a windowing structure arranged between the two resonators in the related technology can be omitted, the structure is simplified, adverse effects on the coupling size caused by the position and dimensional tolerance of the windowing structure can be avoided, and the product performance is improved.

Description

Filter, capacitive coupling structure and adjusting method thereof

Technical Field

The application relates to the technical field of filters, in particular to a filter, a capacitive coupling structure and an adjusting method thereof.

Background

The filter is used as a frequency selection device, has better frequency selection filtering function in circuits and electronic high-frequency systems, can inhibit useless signals and noise outside the frequency band, and is widely applied to aviation, aerospace, radars, communication, electronic countermeasure, broadcast television and various electronic test equipment, in particular to the communication industry.

In the related art, a windowing structure is arranged between two adjacent resonators, and the coupling strength is correspondingly adjusted by adjusting the size of the windowing structure. When the size of the windowing structure is larger, the corresponding coupling bandwidth is larger; conversely, the smaller. However, the structure of windowing will make the product structure complicated, machining efficiency is low, and the processing cost is higher, and the processing size tolerance of windowing structure influences the coupling size for product performance reduces.

Disclosure of Invention

Based on this, it is necessary to overcome the drawbacks of the prior art and to provide a filter, a capacitive coupling structure and a method for adjusting the same, which enable a simplified product structure and at the same time facilitate an improved product performance.

A capacitive coupling structure, the capacitive coupling structure comprising:

the metal resonant cavity comprises a bottom wall, a side wall connected with the bottom wall and a top wall connected with the side wall; and

the metal resonator comprises at least two resonators, wherein each resonator is arranged in a metal resonator, each resonator comprises a resonant rod and a resonant plate, the bottom end of each resonant rod is connected with the side wall of the metal resonator, the top end of each resonant rod is connected with each resonant plate, and the resonant plates and the top wall of the metal resonator are oppositely arranged at intervals;

wherein the arrangement directions of the resonator plates of the two resonators are reversed, and two side portions of the two resonator plates adjacent to each other are arranged at intervals to realize capacitive coupling.

In one embodiment, the side walls include a first side wall and a second side wall which are disposed opposite to each other, and in two adjacent resonators, one of the resonant rods is connected to the first side wall, and the other resonant rod is connected to the second side wall.

In one embodiment, two side portions adjacent to each other in the two resonance plates are respectively provided with a first coupling branch, and the first coupling branches of the two resonators are oppositely arranged at intervals and are capacitively coupled.

In one embodiment, the first coupling branch is a coupling plate disposed at right angles to the resonant plate surface.

In one embodiment, a second coupling branch is arranged at one end of the resonance plate, which is far away from the resonance rod; the second coupling stub is coupled with the sidewall of the metal resonator.

In one embodiment, the capacitive coupling structure further comprises a first tuning component disposed in correspondence with a region between two of the resonator sides disposed adjacently, the first tuning component being connected to the top wall of the metal resonator.

In one embodiment, the resonant plate is provided with a tuning port, and the capacitive coupling structure further comprises a second tuning component corresponding to the tuning port, and the second tuning component is connected to the top wall of the metal resonant cavity.

In one embodiment, the metal resonant cavity is provided with a first opening at the top and a second opening at the bottom, the top wall of the metal resonant cavity is an upper cover plate covered on the first opening, and the bottom wall of the metal resonant cavity is a lower cover plate covered on the second opening.

In one embodiment, the first tuning assembly includes a first tuning screw and a first set nut; the upper cover plate is provided with a first mounting hole which is matched with the first tuning screw rod, the first tuning screw rod is adjustably arranged in the first mounting hole in a penetrating mode, and the first fixing nut is connected with the first tuning screw rod;

the second tuning assembly comprises a second tuning screw and a second fixing nut; the upper cover plate is provided with a second mounting hole which is matched with the second tuning screw, the second tuning screw is adjustably arranged in the second mounting hole in a penetrating mode, and the second fixing nut is connected with the second tuning screw.

A method of adjusting the capacitive coupling structure, comprising:

the size of the capacitive coupling quantity of the two resonators is adjusted by adjusting the size of the interval between the resonant plates of the two resonators which are adjacently arranged; and/or the number of the groups of groups,

the resonant plates of two adjacent resonators are respectively provided with a first coupling branch, and the size of the area of the relative positions of the two first coupling branches is adjusted to adjust the size of the capacitive coupling quantity of the two resonators; and/or the number of the groups of groups,

the capacitive coupling structure further comprises a first tuning component which is arranged corresponding to the area between the two side parts of the adjacent resonators, the first tuning component is connected to the top wall of the metal resonant cavity, and the capacitive coupling quantity of the two resonators is correspondingly adjusted by adjusting the depth of the first tuning component extending into the area between the two side parts of the adjacent resonators.

A filter comprising at least one of said capacitive coupling structures.

In one embodiment, the filter further comprises a joint assembly; the connector assembly comprises a fixing medium arranged on the metal resonant cavity and a conductive needle penetrating through the fixing medium, and the conductive needle is electrically connected with the resonant rod.

According to the filter, the capacitive coupling structure and the adjusting method thereof, as each resonator is arranged in the mode of combining the resonant rods with the resonant plates, the resonant rods are adjacent to the side walls of the metal resonant cavities, the resonant plates are arranged opposite to the top walls of the metal resonant cavities at intervals, the arrangement directions of the resonant plates of the two adjacent resonators are opposite, through research, the capacitive coupling can be realized by arranging the two side parts of the two resonant plates opposite to each other at intervals, the capacitive coupling quantity of the two resonators can meet the requirements by adjusting the distance between the two resonant plates, so that the windowing structure arranged between the two resonators in the related art can be omitted, the structure is simplified, adverse effects on the coupling size caused by the position and the dimensional tolerance of the windowing structure can be avoided, and the product performance is improved.

Drawings

Fig. 1 is a schematic structural diagram of a filter according to an embodiment of the application.

Fig. 2 is an exploded view of the structure shown in fig. 1.

Fig. 3 is a schematic view of an upper cover plate of the structure shown in fig. 1 after being hidden.

Fig. 4 is a top view of the structure shown in fig. 3.

Fig. 5 is a view of two resonators adjacently arranged according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a single-cavity resonator according to an embodiment of the application.

Fig. 7 is an electric field distribution diagram of the structure shown in fig. 6.

Fig. 8 is a magnetic field distribution diagram of the structure shown in fig. 6.

Fig. 9 is another view block diagram of the structure shown in fig. 7.

Fig. 10 is a schematic structural diagram of a single-cavity resonator according to another embodiment of the present application.

Fig. 11 is a schematic structural diagram of a single-cavity resonator according to another embodiment of the present application.

Fig. 12 is a schematic structural diagram of a single-cavity resonator according to another embodiment of the present application.

Fig. 13 is a schematic structural diagram of a single-cavity resonator according to another embodiment of the present application.

Fig. 14 is a schematic structural diagram of a single-cavity resonator according to another embodiment of the present application.

Fig. 15 is a schematic diagram of a topology of a filter according to an embodiment of the application.

Fig. 16 is an S-parameter response chart of the structure shown in fig. 15.

Fig. 17 is a schematic diagram of a topology in a design stage in the related art.

Fig. 18 is an S-parameter response diagram at the design stage in the related art.

Fig. 19 is a schematic diagram of a topology structure at a post-formation stage of a product in the related art.

Fig. 20 is an S-parameter response chart at a post-formation stage of a product in the related art.

10. A resonator; 11. a resonant rod; 111. a transverse bar; 112. a vertical rod; 12. a resonance plate; 121. a first coupling stub; 122. a second coupling stub; 123. a notch; 124. a blind hole; 20. a metal resonant cavity; 21. a bottom wall; 22. a sidewall; 221. a first sidewall; 222. a second sidewall; 223. a third sidewall; 224. a fourth sidewall; 23. a top wall; 231. a second mounting hole; 24. a first opening; 25. a second opening; 26. a through hole; 27. a window; 30. a second tuning assembly; 31. a second tuning screw; 32. a second fixing nut; 40. a joint assembly; 41. a fixing medium; 42. conductive pins.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

Referring to fig. 1 to 5, fig. 1 shows a schematic structure of a filter according to an embodiment of the application. Fig. 2 shows an exploded structural view of the structure shown in fig. 1. Fig. 3 shows a schematic view of the upper cover plate of the structure shown in fig. 1 after being hidden. Fig. 4 shows a top view of the structure of fig. 3. Fig. 5 shows a view of a block diagram of two resonators 10 arranged adjacently in accordance with an embodiment of the present application. An embodiment of the present application provides a capacitive coupling structure, including: a metal resonator 20 and at least two resonators 10. The metal resonator 20 includes a bottom wall 21, a side wall 22 connected to the bottom wall 21, and a top wall 23 connected to the side wall 22. At least two resonators 10 are arranged inside the metal resonator 20. Each resonator 10 includes a resonance rod 11 and a resonance plate 12. The bottom end of the resonant rod 11 is adapted to be connected to a side wall 22 of the metal resonant cavity 20. The top end of the resonance rod 11 is connected to the resonance plate 12. Alternatively, the connection position of the resonance lever 11 and the resonance plate 12 is deviated from the center position of the resonance plate 12, specifically, for example, at one end of the resonance plate 12. The resonator plate 12 is disposed in spaced opposition to the top wall 23 of the metal resonator 20. Wherein the arrangement directions of the resonator plates 12 of the two resonators 10 are arranged adjacently are reversed, and two side portions of the two resonator plates 12 adjacent to each other are arranged at an opposite interval to achieve capacitive coupling.

The end of the resonance plate 12 refers to a portion of the resonance plate 12 that is distant from the portion connected to the resonance rod 11, and the side of the resonance plate 12 refers to any one of the sides of the resonance plate 12 that is opposite to the portion connected to the resonance rod 11.

In the capacitive coupling structure, since each resonator 10 is configured in a combination form of the resonant rod 11 and the resonant plate 12, and the resonant rod 11 is adjacent to the side wall 22 of the metal resonant cavity 20, the resonant plate 12 is disposed opposite to the top wall 23 of the metal resonant cavity 20, and the arrangement directions of the resonant plates 12 of the two adjacent resonators 10 are opposite, it is found through research that the capacitive coupling can be realized by disposing two side portions of the two resonant plates 12 adjacent to each other at opposite intervals, and the capacitive coupling amount of the two resonators 10 can meet the requirement by adjusting the spacing between the two resonant plates 12, so that the windowing structure disposed between the two resonators 10 in the related art can be omitted, the structure is simplified, and adverse effects on the coupling size caused by the position and the dimensional tolerance of the windowing structure can be avoided, and the product performance is improved.

Wherein the smaller the spacing of the two resonator plates 12, the greater the amount of capacitive coupling of the two resonators 10; conversely, the larger the spacing of the two resonator plates 12, the smaller the amount of capacitive coupling of the two resonators 10.

When the arrangement positions, shapes and sizes of the adjacent two resonators 10 are different, electric coupling and magnetic coupling of different sizes are generated between the two resonators 10. Therefore, by adjusting the arrangement position, shape, and size of the resonator 10, a desired amount of coupling can be obtained.

Furthermore, when the arrangement directions of the resonance plates 12 of the two resonators 10 are reversed, that is, the resonance rods 11 of the two resonators 10 are respectively connected to the two side walls 22 oppositely disposed on the metal resonator 20, the arrangement directions of the resonance plates 12 are reversed. Specifically, the arrangement direction of the resonance plates 12 of one resonator 10 is shown by an arrow f1 in fig. 4, and the arrangement direction of the resonance plates 12 of the other resonator 10 is shown by an arrow f2 in fig. 4, the direction shown by the arrow f1 being opposite to the direction shown by the arrow f 2. In addition, when the arrangement directions of the resonance plates 12 of the two resonators 10 are the same, that is, the resonance rods 11 of the two resonators 10 are respectively connected to the same side wall 22 on the metal resonator 20, the arrangement directions of the resonance plates 12 are the same.

In addition, for the purpose of studying the performance of the resonator 10 in the above embodiment, referring to fig. 6 to 8, fig. 6 shows a structural diagram of the single-cavity resonator 10 according to an embodiment, fig. 7 shows an electric field distribution diagram of the single-cavity resonator 10, and fig. 8 shows a magnetic field distribution diagram of the single-cavity resonator 10, and it is known through analysis that the electric field and the magnetic field distribution are similar to TEM modes. In this case, as can be seen from fig. 7, the electric field is mainly distributed near the plane of the resonator plate 12, and the density of arrows near the plane of the resonator plate 12 in fig. 7 is relatively sparse, which means that the electric field strength is larger in this portion. The electric field radiation direction is a direction perpendicular to the plane of the resonance plate 12, starting from the plane of the resonance plate 12. As can be seen in connection with fig. 8, the magnetic field is mainly distributed near the resonance rod 11, being arranged around the axial direction of the resonance rod 11.

Referring to fig. 1 and 4, in one embodiment, the sidewall 22 includes a first sidewall 221 and a second sidewall 222 disposed opposite to each other. In two resonators 10 arranged adjacently, one of the resonance rods 11 is connected to the first side wall 221, and the other resonance rod 11 is connected to the second side wall 222. In this way, the opposite direction of arrangement of the resonator plates 12 of two resonators 10 adjacently arranged can be achieved.

Referring to fig. 1 and 4, alternatively, the first sidewall 221 and the second sidewall 222 are disposed parallel to each other.

Referring to fig. 1 and 4, in one embodiment, the sidewall 22 further includes a third sidewall 223 and a fourth sidewall 224. The third side wall 223 is opposite to the fourth side wall 224, and the third side wall 223 and the fourth side wall 224 are respectively connected with the first side wall 221 and the second side wall 222, so that the side walls 22 enclose to form a closed structure or a non-closed structure. Specifically, the enclosed closed structure is rectangular in outline, for example.

Referring to fig. 1 and fig. 4, when the metal resonant cavities 20 are formed into two or more non-closed structures, the two metal resonant cavities 20 share the second side wall 222, for example, a window 27 may be provided at the junction of the second side wall 222, the fourth side wall 224, or the second side wall 222 and the fourth side wall 224, and the two metal resonant cavities 20 are coupled to each other through the window 27.

Optionally, the resonant rod 11, the resonant plate 12 and the side wall 22 of the metal resonant cavity 20 are in an integrated structure, that is, the resonator 10 and the side wall 22 of the metal resonant cavity 20 can be integrally processed and formed, so that the step of separately processing and assembling in the related art is omitted, the assembly error can be reduced, the index can be realized, and meanwhile, the manufacturing process difficulty and the cost can be reduced.

In one embodiment, the resonant rod 11, the resonant plate 12 and the sidewall 22 of the metal resonant cavity 20 are integrally formed.

In one embodiment, the resonant rod 11 includes, but is not limited to, one or more of a straight rod, a broken line rod, a curved rod, as long as the function of connecting and fixing the resonant plate 12 is achieved.

Referring to fig. 6 to 8, in one embodiment, the resonant rod 11 includes a transverse rod 111 and a vertical rod 112. Opposite ends of the transverse rod 111 are respectively connected with the side wall 22 of the metal resonant cavity 20 and the bottom end of the vertical rod 112, and the top end of the vertical rod 112 is connected with the resonant plate 12. Therefore, the electric field distribution and the magnetic field distribution can meet the preset requirements.

Referring to fig. 6, in some embodiments, the transverse rod 111 is disposed at an angle with respect to the sidewall 22 of the metal resonator 20, for example, between 60 ° and 120 °, and is flexibly adjusted and set according to practical requirements. In addition, the transverse rod 111 and the vertical rod 112 are disposed at an angle, for example, between 60 ° and 120 °, and are flexibly adjusted and disposed according to actual requirements. In addition, the vertical rod 112 is disposed at an angle with respect to the resonator plate 12, for example, between 60 ° and 120 °, and is flexibly adjusted and set according to actual requirements.

Alternatively, the cross-sectional shape of the resonant rod 11 includes, but is not limited to, a regular shape and an irregular shape such as a circle (as shown in fig. 10), an ellipse, a polygon, etc., and particularly can be flexibly adjusted and set according to actual needs. Among these, polygons include, but are not limited to, triangles, quadrilaterals (as shown in fig. 6), pentagons, hexagons, and the like.

Referring to fig. 6, in one embodiment, the transverse rod 111 is perpendicular to the side wall 22 of the metal resonator 20, and the vertical rod 112 is perpendicular to the transverse rod 111 and the resonator plate 12, respectively.

Referring to fig. 6, in some embodiments, the shape of the resonator plate 12 can be flexibly adjusted and set according to practical requirements, including a flat plate and a non-flat plate. Wherein the non-flat plate includes, but is not limited to, a regularly shaped plate body such as a curved plate or an irregularly shaped plate body. The curve plate can be in a mutually combined form of at least two straight plates, can be in a combined form of the straight plates and the arc plates, can be set as the arc plates and the like. When the resonator plate 12 is provided as a flat plate, the flat plate enables mutual coupling with the top wall 23 of the metal resonator 20; when the resonance plate 12 is provided as a non-flat plate, not only the mutual coupling with the top wall 23 of the metal resonance chamber 20 but also the mutual coupling with the side wall 22 of the metal resonance chamber 20 can be achieved, so that the coupling amount increases.

In addition, the thickness of the resonant plate 12 can be flexibly adjusted and set according to practical requirements, and is not limited herein. When the thickness of the resonance plate 12 is sufficiently small, it is correspondingly sheet-shaped; when the thickness of the resonance plate 12 is sufficiently large, it is within the scope of the present embodiment to have a block shape.

The resonance plate 12 may be a plate having a uniform thickness or a plate having a non-uniform thickness, and may be provided with a boss or a recess at one or more portions, for example, the plate thickness at the boss is relatively large, and the plate thickness at the recess is relatively small.

Referring to fig. 5, in one embodiment, two sides of two resonator plates 12 adjacent to each other are each provided with a first coupling branch 121. The first coupling limbs 121 of the two resonators 10 are disposed at opposite intervals and capacitively coupled. In this way, the two first coupling branches 121 are capacitively coupled to each other, so that the capacitive coupling amount of the two side portions of the two resonator plates 12 adjacent to each other can be increased, that is, the capacitive coupling amount of the two resonators 10 can be increased.

Wherein, when the area of the first coupling branch 121 and the second coupling branch 122 aligned with each other is larger, the corresponding coupling bandwidth is larger; conversely, the smaller.

The shape of the two resonators 10 may be the same or different. Furthermore, the shape of the first coupling stub 121 of the two resonators 10 may be the same or different.

Referring to fig. 5, in one embodiment, the first coupling stub 121 is a coupling plate disposed at right angles to the plate surface of the resonator plate 12. Thus, the two first coupling branches 121 have better capacitive coupling effect, and have small occupied space and small material consumption. Of course, the first coupling stub 121 may also be disposed at an acute angle or an obtuse angle with respect to the plate surface of the resonator plate 12.

The first coupling branches 121 may be flexibly arranged and adjusted to various shapes according to practical needs, including but not limited to various regular shapes and irregular shapes such as flat plates, bent plates, columns, blocks, sheets, strips, and the like.

Alternatively, the first coupling stub 121 is integrally formed with the resonator plate 12.

Referring to fig. 3 to 5, in one embodiment, a second coupling branch 122 is disposed at an end of the resonant plate 12 away from the resonant rod 11. The second coupling stub 122 is coupled with the sidewall 22 of the metal resonator 20. In this way, the resonant plate 12 is disposed at a relative interval from the top wall 23 of the metal resonant cavity 20 and implements coupling, and the second coupling stub 122 is also disposed at a relative interval from the side wall 22 of the metal resonant cavity 20 and implements coupling, so that the loading capacitance is increased, and the overall volume size of the metal resonant cavity 20 is relatively reduced.

Referring to fig. 3 to 5, specifically, when the resonant rod 11 is connected to the first sidewall 221, the second coupling stub 122 and the second sidewall 222 on the resonant plate 12 connected to the resonant rod 11 are provided with a gap, and are capacitively coupled to each other; when the resonant rod 11 is connected to the second sidewall 222, the second coupling stub 122 of the resonant plate 12 connected to the resonant rod 11 is spaced apart from the first sidewall 221 to be capacitively coupled to each other.

Referring to fig. 3 to 5, in one embodiment, the top end of the second coupling stub 122 is connected to the end of the resonator plate 12, and the bottom end of the second coupling stub 122 extends toward the bottom wall 21 of the metal resonator 20.

Wherein, when the length dimension and/or the width dimension of the second coupling branch 122 is greater, the loading capacitance of the second coupling branch 122 and the resonance plate 12 is greater; conversely, the smaller the loading capacitance.

Similar to the first coupling branch 121, the second coupling branch 122 may be flexibly configured and adjusted to various shapes according to actual needs, including but not limited to various regular shapes and irregular shapes such as a flat plate shape, a bent plate shape, a cylindrical shape, a block shape, a sheet shape, a bar shape, and the like.

Optionally, the second coupling stub 122 is integrally formed with the resonator plate 12.

Referring to fig. 3 to 5, in one embodiment, the capacitive coupling structure further includes a first tuning component (not shown) disposed corresponding to a region (e.g., an M-wire frame region in fig. 4) between sides of two resonators 10 that are adjacently disposed. The first tuning component is attached to the top wall 23 of the metallic resonator 20. In this way, the size of the capacitive coupling quantity is adjusted correspondingly by adjusting the depth of the first tuning component extending into the region M between the side portions of the two resonators 10 which are adjacently arranged, so as to play a role in fine tuning, and the coupling quantity between the two resonators 10 can be controlled more accurately. Wherein the amount of capacitive coupling is smaller as the depth to which the first tuning component extends is greater; conversely, the greater the amount of capacitive coupling.

Alternatively, the first tuning element may be disposed in a location corresponding to the middle position of the region M between the side portions of the two resonators 10, or may be disposed in a location adjacent to the side wall 22 in the region M between the side portions of the two resonators 10, specifically, flexibly according to practical requirements, which is not limited herein. Wherein the tuning effect of the first tuning assembly is relatively pronounced when it is arranged aligned in the middle of the region M between the sides of the two resonators 10; when the first tuning assembly is aligned to the region M between the sides of the two resonators 10 and is disposed close to the side wall 22, the tuning effect of the first tuning assembly is relatively weakened, but the position of the first tuning assembly can be reasonably arranged by using space, so that the product is compact in size and reduced in overall size.

Referring to fig. 1 to 3, in one embodiment, the resonator plate 12 is provided with a tuning port, and the capacitive coupling structure further includes a second tuning component 30 corresponding to the location of the tuning port. The second tuning assembly 30 is connected to the top wall 23 of the metal resonator 20. In this way, the second tuning component 30 is used to debug the coupling amount, so that the coupling amount size index meets the requirement. Furthermore, since the second tuning assembly 30 is located at the top wall 23 of the metal resonator 20, the fixing surface of the resonator 10 (i.e., the wall surface of the side wall 22 of the metal resonator 20) is not in one plane, in other words, the fixing surface of the resonator 10 intersects with the mounting surface of the tuning assembly, thereby causing the electromagnetic fields of the two to be completely different.

Alternatively, the tuning orifice is provided as a notch 123 (as shown in any one of fig. 6-11 and 14) or a blind hole 124 (as shown in fig. 13). In this way, when the second tuning assembly 30 is disposed on the upper cover plate opposite to the notch 123, a tuning rod (specifically, a second tuning screw 31 hereinafter) of the second tuning assembly 30 is inserted into the notch 123 to adjust the coupling amount. Furthermore, the resonator 10 is constituted by a 1/4 wavelength coaxial-like line with single ended open circuit, with loaded capacitance adjustment (commonly referred to as tuning rod).

The shape of the notch 123 may be either a closed notch 123 (as shown in fig. 11 or 14) or an unsealed notch 123 (as shown in any one of fig. 6 to 10). Closed means that one of the points of the rim of the selected notch 123 moves clockwise or counterclockwise along the rim of the notch 123, and eventually returns to the selected point. Conversely, non-closed means that one of the points of the rim of the selected notch 123 moves clockwise or counterclockwise along the rim of the notch 123 and cannot return to the selected point.

When provided as a closed notch 123, the shape includes, but is not limited to, a notch 123 of a regular shape such as a circular, oval, polygonal, etc., and a notch 123 of an irregular shape, which are not limited herein. When provided as a non-closed notch 123, the shape includes, but is not limited to, a notch 123 of a regular shape including a U-shaped notch, a semicircular notch, a semi-elliptical notch, a square notch, a trapezoidal notch, etc., and a notch 123 of an irregular shape, which is not limited herein.

Specifically, the notch 123 is flexibly adjusted and set according to the actual requirement in the opening form of the resonant plate 12, and may be formed on the middle part of the resonant plate 12 (as shown in fig. 11 or 14), or may be formed on the side part of the resonant plate 12 and synchronously formed on the second coupling branch 122 (refer to any one of fig. 6 to 10), so long as the notch is opposite to the tuning rod of the second tuning assembly 30, and the tuning rod can be penetrated. As an example, when the notch 123 is provided on both the resonance plate 12 and the second coupling stub 122, and the notch 123 is provided as the non-closed notch 123, the tuning rod of the second tuning assembly 30 can be easily fitted into the notch 123 during assembly of the filter, and can be advantageous in reducing the volume size of the filter.

Of course, referring to fig. 12, as an alternative, the notch 123 may not be provided on the resonator plate 12.

In one embodiment, the metal resonator 20 is provided with a first opening 24 at the top and a second opening 25 at the bottom, the top wall 23 of the metal resonator 20 is an upper cover plate covering the first opening 24, and the bottom wall 21 of the metal resonator 20 is a lower cover plate covering the second opening 25.

Optionally, the upper cover plate includes, but is not limited to, being welded to the top of the metal resonator 20 or being attached to the top by bonding, clamping, or using screws, pins, rivets, or the like. Likewise, the lower cover plate includes, but is not limited to, being welded to the bottom of the metal resonator 20 or being attached to it by bonding, clamping, or using screws, pins, rivets, or the like.

Of course, as some alternatives, the top wall 23, the side wall 22, the bottom wall 21, the top wall 23 of the metal resonator 20 and the resonator 10 are integrally formed by a 3D printing process.

Referring to fig. 6 again, in one embodiment, the resonator 10 and the metal resonator 20 are metal pieces and are integrally formed by a powder metallurgy process, a metal injection molding process or a 3d printing process; alternatively, the resonator 10 and the metal resonator 20 are metalized dielectric members.

The tolerance control level based on the powder metallurgy process is good, and the metal resonant cavity 20 and the resonator 10 are integrally manufactured by adopting the powder metallurgy process, so that the internal tolerance can be effectively controlled, the consistency of products is improved, and the debugging difficulty is remarkably reduced.

The metallized medium piece comprises a medium body and a metal layer arranged on the outer wall of the medium body. The metal layer is disposed on the outer wall of the dielectric body by electroplating, sputtering or sticking.

In one embodiment, the first tuning assembly includes a first tuning screw and a first fixing nut (not shown). The upper cover plate is provided with a first mounting hole (not shown in the figure) which is matched with the first tuning screw, the first tuning screw is adjustably arranged in the first mounting hole in a penetrating mode, and the first fixing nut is connected with the first tuning screw. In this way, the coupling quantity is correspondingly adjusted by adjusting the depth of the first tuning screw extending into the metal resonant cavity 20, so that the coupling quantity index meets the requirement. In addition, after the first tuning screw is adjusted to a proper position, the first tuning screw is fixedly connected to the upper cover plate through mutual abutting of the first fixing nut and the upper cover plate.

Referring to fig. 1 to 3, in one embodiment, the second tuning assembly 30 includes a second tuning screw 31 and a second fixing nut 32. The upper cover plate is provided with a second mounting hole 231 which is matched with the second tuning screw 31, the second tuning screw 31 is adjustably arranged in the second mounting hole 231 in a penetrating mode, and the second fixing nut 32 is connected with the second tuning screw 31. In this way, the coupling amount is correspondingly adjusted by adjusting the depth of the second tuning screw 31 extending into the metal resonant cavity 20, so that the coupling amount index meets the requirement. In addition, after the second tuning screw 31 is adjusted to a proper position, the second tuning screw 31 is firmly connected to the upper cover plate by abutting the second fixing nut 32 with the upper cover plate.

Referring to fig. 1 to 5, in one embodiment, a method for adjusting a capacitive coupling structure according to any one of the above embodiments includes:

the magnitude of the capacitive coupling amount of the two resonators 10 is adjusted by adjusting the magnitude of the pitch of the resonance plates 12 in which the two resonators 10 are adjacently arranged; and/or the number of the groups of groups,

the resonant plates 12 of two adjacent resonators 10 are respectively provided with a first coupling branch 121, and the size of the area of the relative positions of the two first coupling branches 121 is adjusted to adjust the size of the capacitive coupling quantity of the two resonators 10; and/or the number of the groups of groups,

the capacitive coupling structure further comprises a first tuning component which is arranged corresponding to the area between the side parts of the two resonators 10 which are adjacently arranged, the first tuning component is connected to the top wall 23 of the metal resonant cavity 20, and the size of the capacitive coupling quantity of the two resonators 10 is correspondingly adjusted by adjusting the depth of the first tuning component which extends into the area between the side parts of the two resonators 10 which are adjacently arranged.

According to the adjusting method of the capacitive coupling structure, the capacitive coupling quantity of the two resonators 10 can meet the requirement by adjusting the distance between the two resonator plates 12, so that a windowing structure arranged between the two resonators 10 in the related art can be omitted, the structure is simplified, adverse effects of the position and the dimensional tolerance of the windowing structure on the coupling size can be avoided, and the product performance is improved.

Referring to fig. 1-5, in one embodiment, a filter includes at least one capacitive coupling structure of any of the above embodiments.

In the above filter, since each resonator 10 is configured in a combination of the resonant rod 11 and the resonant plate 12, and the resonant rod 11 is adjacent to the side wall 22 of the metal resonant cavity 20, the resonant plate 12 is disposed opposite to the top wall 23 of the metal resonant cavity 20, and the arrangement directions of the resonant plates 12 of the two adjacent resonators 10 are opposite, it is found that the capacitive coupling can be achieved by disposing two side portions of the two resonant plates 12 adjacent to each other at opposite intervals, and the capacitive coupling amount of the two resonators 10 can meet the requirement by adjusting the spacing between the two resonant plates 12, so that the windowing structure disposed between the two resonators 10 in the related art can be omitted, the structure is simplified, and adverse effects on the coupling size caused by the position and dimensional tolerance of the windowing structure can be avoided, and the product performance can be improved.

Referring to fig. 1 to 5, in one embodiment, the filter further includes two connector assemblies 40 disposed on the metal resonator 20, wherein one connector assembly 40 is electrically connected to one resonator 10, and the other connector assembly 40 is electrically connected to the other resonator 10. Thus, one of the joint assemblies 40 is used for inputting signals, the other joint assembly 40 is used for outputting signals, one of the joint assemblies 40 inputs signals to one of the resonators 10, and outputs signals through the other resonator 10 and the other receiving assembly.

The connector assembly 40 includes a fixing medium 41 disposed on the metal resonant cavity 20 and a conductive pin 42 penetrating through the fixing medium 41, wherein the conductive pin 42 is electrically connected with the resonant rod 11.

Specifically, the conductive pin 42 includes, but is not limited to, welded and fixed to the resonant rod 11.

Referring to fig. 15 and 16, fig. 15 is a schematic diagram showing a topology of a filter according to an embodiment of the application, and fig. 16 is an S-parameter response diagram of the structure shown in fig. 15.

As can be seen from an examination of fig. 16, the filter of the present embodiment has the following advantages:

on the one hand, it is possible to use more capacitive coupling in the topology. This way of using capacitive coupling in bulk mixing in the main coupling can interrupt the path of a single kind of coupling, thereby greatly reducing the effect of parasitic coupling on passband suppression.

On the other hand, the capacitive coupling is different from the inductive coupling in implementation structure, and the implementation form of the filter can be simplified by using the capacitive coupling in a proper position, so that additional coupling components are reduced.

In order to embody the performance advantages of the filter of the present embodiment, please refer to fig. 17 to 20 again, fig. 17 shows a schematic topology diagram of the related art at the design stage, the filter in fig. 17 is 10-cavity 4 zero, wherein the capacitive coupling is formed between 6-9, and the inductive coupling is formed between the remaining resonators. Fig. 18 shows an S-parameter response diagram at the design stage in the related art, and it can be seen that 3 passband high-end zeros and one passband low-end zero are correspondingly implemented. However, fig. 19 shows a schematic diagram of a topology structure at a post-product-forming stage in the related art, fig. 20 shows an S-parameter response diagram at a post-product-forming stage in the related art, and in practical implementation, inductive parasitic coupling is generated between 3-5 resonators (as shown by a dotted line in fig. 19), and in addition, parasitic zero is generated at a high end of a passband (as shown in fig. 20), resulting in deterioration of low-end rejection performance and failure of an expected design index.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. A capacitive coupling structure, the capacitive coupling structure comprising:

the metal resonant cavity comprises at least two resonators, wherein each resonator is arranged in the metal resonant cavity, each resonator comprises a resonant rod and a resonant plate, the bottom end of each resonant rod is directly connected with the side wall of the metal resonant cavity, the top end of each resonant rod is connected with the resonant plate, and the resonant plates and the top wall of the metal resonant cavity are oppositely arranged at intervals;

wherein the arrangement directions of the resonance plates of the two adjacent resonators are opposite, and two side parts of the two resonance plates adjacent to each other are oppositely arranged at intervals to realize capacitive coupling; the side walls comprise a first side wall and a second side wall which are oppositely arranged, and in two resonators which are adjacently arranged, one resonant rod is connected with the first side wall, and the other resonant rod is connected with the second side wall.

2. The capacitive coupling structure of claim 1, wherein the first sidewall and the second sidewall are disposed parallel to each other.

3. The capacitive coupling structure according to claim 1, wherein two side portions of the two resonator plates adjacent to each other are each provided with a first coupling stub, and the first coupling stubs of the two resonators are disposed at opposite intervals and capacitively coupled.

4. A capacitive coupling structure according to claim 3, wherein the first coupling stub is a coupling plate disposed at right angles to the resonant plate face.

5. The capacitive coupling structure according to claim 1, wherein an end of the resonance plate, which is far from the resonance rod, is provided with a second coupling branch; the second coupling stub is coupled with the sidewall of the metal resonator.

6. The capacitive coupling structure of claim 1, further comprising a first tuning assembly disposed in correspondence with an area between two of the resonator sides disposed adjacently, the first tuning assembly being connected to the top wall of the metallic resonator.

7. The capacitive coupling structure of claim 6, wherein the resonator plate is provided with a tuning port, and further comprising a second tuning assembly positioned in correspondence with the tuning port, the second tuning assembly being coupled to the top wall of the metal resonator.

8. The capacitive coupling structure of claim 7, wherein the metal resonator is provided with a first opening at a top and a second opening at a bottom, the top wall of the metal resonator is an upper cover plate covering the first opening, and the bottom wall of the metal resonator is a lower cover plate covering the second opening.

9. The capacitive coupling structure of claim 8, wherein the first tuning assembly comprises a first tuning screw and a first fixation nut; the upper cover plate is provided with a first mounting hole which is matched with the first tuning screw rod, the first tuning screw rod is adjustably arranged in the first mounting hole in a penetrating mode, and the first fixing nut is connected with the first tuning screw rod;

10. A method of adjusting a capacitive coupling structure according to any one of claims 1 to 9, comprising:

11. A filter, characterized in that it comprises at least one capacitive coupling structure according to any one of claims 1 to 9.

12. The filter of claim 11, further comprising a joint assembly; the connector assembly comprises a fixing medium arranged on the metal resonant cavity and a conductive needle penetrating through the fixing medium, and the conductive needle is electrically connected with the resonant rod.