Filter and communication device

Abstract

The application relates to the technical field of mobile communication, and discloses a filter and a communication device. The filter comprises a cavity, a cover plate and a resonator assembly. The cover plate is arranged on the cavity. The resonator assembly comprises a first resonator and two second resonators. The first resonator is connected with the side wall of the cavity, the first resonator is located between the two second resonators, each second resonator is independently connected with the bottom wall of the cavity or the cover plate, the extension direction of the first resonator is arranged at an angle with the extension direction of the second resonator, the first resonator and the second resonator are coupled and connected, and the two second resonators are coupled and connected. The filter and the communication device have the advantages that a flying rod does not need to be arranged between the two second resonators, one resonant cavity can be omitted, the overall size of the filter is smaller, the miniaturization requirement of the product can be met, and the material cost is reduced. In addition, when the flying rod is omitted, the adverse effect on the far-end suppression can be avoided, and the performance of the product is improved.

Description

Technical Field

[0001] This application relates to the field of mobile communication technology, and in particular to a filter and a communication device. Background Technology

[0002] As a key frequency selection device, the filter is an indispensable core component in modern communication systems, and its performance directly affects the quality and efficiency of the communication system. With the development of 5G technology, mobile terminals and base station equipment have placed higher demands on filters in terms of size, cost, electrical performance, and production efficiency. As a result, filter design faces multiple severe challenges, including miniaturization, low cost, high stability, and high-efficiency mass production.

[0003] In traditional filter design, cross-coupling is often introduced to effectively improve out-of-band rejection performance. One specific implementation method is to add a flybar inside the filter cavity, which is pressed into an insulating support medium and then installed within the cavity. The flybar can achieve capacitive or inductive coupling in the filter and can flexibly generate transmission zeros near the passband, thereby significantly improving the filter's out-of-band rejection capability.

[0004] However, existing filters cannot meet the miniaturization requirements of products, and their material costs are high. Furthermore, a resonant point is generated at a distant location. Summary of the Invention

[0005] Therefore, it is necessary to provide a filter and communication device that addresses the shortcomings of existing technologies, enabling product miniaturization, reducing material costs, and avoiding adverse effects on remote suppression.

[0006] On one hand, this application provides a filter, the filter comprising:

[0007] cavity;

[0008] A cover plate, the cover plate being installed in the cavity; and

[0009] A resonator assembly includes a first resonator and two second resonators. The first resonator is connected to the side wall of the cavity and is located between the two second resonators. Each second resonator is independently connected to the bottom wall of the cavity or the cover plate. The extension direction of the first resonator is set at an angle to the extension direction of the second resonator. The first resonator is coupled to the second resonator, and the two second resonators are coupled to each other.

[0010] In one embodiment, the filter further includes a cross-coupling adjustment section; the cross-coupling adjustment section is disposed on the bottom wall of the cavity or the cover plate; the cross-coupling adjustment section passes through the coupling window between the two second resonators; one end of the cross-coupling adjustment section extends into the resonant cavity corresponding to one of the second resonators, and the other end of the cross-coupling adjustment section extends into the resonant cavity corresponding to the other second resonator.

[0011] In one embodiment, the height of the cross-coupling adjustment part protruding from the bottom wall of the cavity or the cover plate is adjustable.

[0012] In one embodiment, the cross-coupling adjustment section includes a first coupling adjustment section; the orthographic projection of the first coupling adjustment section onto the bottom wall of the cavity is completely misaligned with the orthographic projection of each of the second resonators onto the bottom wall of the cavity; the first coupling adjustment section passes through the coupling window between the two second resonators, one end of the first coupling adjustment section extends into the resonant cavity corresponding to one of the second resonators, and the other end of the first coupling adjustment section extends into the resonant cavity corresponding to the other second resonator.

[0013] In one embodiment, the cross-coupling adjustment section further includes a second coupling adjustment section, which is connected to one end of the first coupling adjustment section, and the second coupling adjustment section is arranged between the second resonator and the bottom wall of the cavity or the cover plate.

[0014] In one embodiment, there are two second coupling adjustment units, which are connected one-to-one with the opposite ends of the first coupling adjustment unit. Each second coupling adjustment unit is arranged between each second resonator and the bottom wall of the cavity or the cover plate.

[0015] In one embodiment, the second coupling adjustment part is directly connected to the second resonator; or, the second coupling adjustment part and the second resonator are spaced apart along the extension direction of the second resonator.

[0016] In one embodiment, the filter further includes an isolation section connected to the inner wall of the cavity, the isolation section being located between the resonant cavity corresponding to the first resonator and the resonant cavity corresponding to the second resonator.

[0017] In one embodiment, the isolation portion is connected to the side wall of the cavity; and / or, there are two isolation portions, each of which is located between the resonant cavity corresponding to the first resonator and the resonant cavity corresponding to each of the second resonators.

[0018] In one embodiment, the filter further includes a coupling adjustment component disposed on the bottom wall of the cavity or the cover plate, the coupling adjustment component being located between the first resonator and the second resonator.

[0019] In one embodiment, the coupling adjustment assembly includes a first adjustment rod, which is adjustable along its length to the bottom wall of the cavity or the cover plate.

[0020] In one embodiment, the filter further includes a first debugging component disposed on the bottom wall of the cavity or the cover plate, the first debugging component being disposed opposite to the side wall of the first resonator along its extension direction.

[0021] In one embodiment, the first adjustment component includes a second adjustment rod, which is adjustable along its length to the bottom wall of the cavity or the cover plate.

[0022] In one embodiment, the filter further includes a second debugging component disposed on the sidewall of the cavity opposite to the first resonator, and the second debugging component is disposed opposite to the end face of the first resonator along its extension direction.

[0023] In one embodiment, the second adjustment component includes a third adjustment rod, which is adjustable along its length to the side wall of the cavity.

[0024] In one embodiment, the filter further includes a third debugging component disposed on the bottom wall of the cover plate or the cavity, and the third debugging component is positioned opposite to the free end face of the second resonator along its extension direction.

[0025] In one embodiment, the third adjustment component includes a fourth adjustment rod, which is adjustable along its length to the bottom wall of the cover plate or the cavity.

[0026] In one embodiment, the filter further includes a first connector, through which the first resonator is connected to the sidewall of the cavity; or,

[0027] The filter further includes a second connector and an auxiliary bracket. The auxiliary bracket is disposed on one side of the cavity and is fixedly connected to the cavity through the second connector. The first resonator is mounted on the auxiliary bracket.

[0028] In one embodiment, the filter further includes a third connector, through which the second resonator is connected and fixed to the bottom wall of the cavity or the cover plate.

[0029] On the other hand, this application also provides a communication device, which includes the aforementioned filter.

[0030] The aforementioned filter and communication device, because the first resonator is mounted on the side wall of the cavity, and the extension direction of the first resonator is set at an angle to the extension direction of the second resonator, allows the two second resonators to be coupled together. Furthermore, by placing the first resonator at the coupling window position of the two second resonators, a flyback mechanism is eliminated from the need for a flyback mechanism between the two second resonators, and a resonant cavity can be omitted. This results in a smaller overall size of the filter, meeting the requirements for product miniaturization and reducing material costs. In addition, omitting the flyback mechanism avoids adverse effects on far-end suppression, thus improving product performance. Attached Figure Description

[0031] Figure 1 This is a structural diagram of a filter according to an embodiment of this application.

[0032] Figure 2 for Figure 1 The filter's decomposed structure diagram is shown.

[0033] Figure 3 for Figure 1 The diagram shown shows the structure of the filter after the cover plate is hidden.

[0034] Figure 4 for Figure 1 The diagram shows a top view of the filter's structure.

[0035] Figure 5 for Figure 4 Sectional view of the structure at point AA.

[0036] Figure 6 This is a structural diagram of the filter in another embodiment of this application after the cover plate is hidden.

[0037] Figure 7 for Figure 6 The filter's decomposed structure diagram is shown.

[0038] Figure 8 This is a structural diagram of a filter according to another embodiment of this application.

[0039] Figure 9 This is a structural diagram of a filter according to an embodiment of the related art.

[0040] Figure 10 Based on Figure 5The S-parameter diagram of the filter is shown when the protrusion height h of the first coupling adjustment section is 3mm.

[0041] Figure 11 Based on Figure 5 The S-parameter diagram of the filter is shown when the protrusion height h of the first coupling adjustment section is 5 mm.

[0042] Figure 12 This is an S-parameter diagram of a filter according to an embodiment of the present application, where both second resonators are connected to the bottom wall of the cavity.

[0043] Figure 13 Based on Figure 8 The S-parameter plot of the filter is shown.

[0044] Figure 14 The image shows the far-end suppression S-parameters of a 10-cavity, 4-zero filter with two flybars, according to an embodiment of the related art.

[0045] Figure 15 Based on Figure 8 The diagram shows the far-end suppression S-parameters of the filter.

[0046] Explanation of reference numerals in the attached figures:

[0047] 10. Cavity; 20. Cover plate; 30. Resonator assembly; 31. First resonator; 32. Second resonator; 40. Cross-coupling adjustment part; 41. First coupling adjustment part; 42. Second coupling adjustment part; 421. Clearance hole; 50. Isolation part; 60. Coupling adjustment assembly; 61. First adjustment rod; 62. First adjustment nut; 70. First debugging assembly; 71. Second adjustment rod; 72. Second adjustment nut; 80. Second debugging assembly; 81. Third adjustment rod; 82. Third adjustment nut; 91. Third debugging assembly; 911. Fourth adjustment rod; 912. Fourth adjustment nut; 92. Second connector; 93. Auxiliary bracket; 94. Third connector. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0049] As described in the background section, existing filters cannot meet the miniaturization requirements of products and have high material costs. Furthermore, a resonant point is generated at the far end. Research has found that adding a flybar inside the filter cavity increases the filter's size, thus failing to meet miniaturization requirements and increasing material costs. Moreover, the flybar negatively impacts far-end suppression, generating a resonant point at the far end.

[0050] For the reasons mentioned above, this application provides a filter and communication device that can achieve product miniaturization requirements, reduce material costs, and avoid adverse effects on remote suppression.

[0051] The following will combine Figures 1 to 9 A filter according to an embodiment of this application will be described in detail.

[0052] See Figure 1 One embodiment of this application provides a filter, which may specifically be a simplexer, duplexer, splitter, combiner, or tower-top amplifier, etc., and is not limited thereto.

[0053] See Figure 1 and Figure 2 Specifically, the filter includes a cavity 10 and a cover plate 20.

[0054] For example, the cavity 10 may be, but is not limited to, a metal component, specifically made of various metal materials such as copper, aluminum, iron, or stainless steel. Of course, the cavity 10 may also include a dielectric material, and for example, a metal layer may be provided on both the inner and outer walls of the dielectric material.

[0055] For example, cover plate 20 is installed in cavity 10. Cover plate 20 and cavity 10 can be detachably connected or non-detachably connected, and this is not limited here. When cover plate 20 and cavity 10 are detachably connected, cover plate 20 and cavity 10 can be fixedly connected by mounting parts such as pins, screws or clips, or by soldering, or by various other methods.

[0056] Please see Figures 2 to 5 For example, the filter also includes a resonator assembly 30. The resonator assembly 30 includes a first resonator 31 and two second resonators 32. The first resonator 31 is connected to a sidewall of the cavity 10 and is located between the two second resonators 32. Each second resonator 32 is independently connected to the bottom wall or cover plate 20 of the cavity 10. Specifically, each second resonator 32 is connected to the bottom wall of the cavity 10; or, each second resonator 32 is connected to the cover plate 20; or, one second resonator 32 is connected to the bottom wall of the cavity 10 and the other second resonator 32 is connected to the cover plate 20.

[0057] It should be noted that when both second resonators 32 are connected to the bottom wall of the cavity 10 or to the cover plate 20, inductive coupling can be achieved; conversely, when one second resonator 32 is connected to the bottom wall of the cavity 10 and the other second resonator 32 is connected to the cover plate 20, capacitive coupling can be achieved.

[0058] The extension direction of the first resonator 31 is set at an angle to the extension direction of the second resonator 32. Specifically, the angle between the extension direction of the first resonator 31 and the extension direction of the second resonator 32 is, but is not limited to, between 80° and 100°, such as 80°, 85°, 90°, 95° or 100°.

[0059] The first resonator 31 is coupled to the second resonator 32, and the two second resonators 32 are coupled to each other.

[0060] It is understood that the filter in this embodiment is specifically based on one resonator component 30, but more resonator components 30 can be flexibly adjusted and set according to actual needs, and there is no limitation here.

[0061] In the aforementioned filter, since the first resonator 31 is mounted on the side wall of the cavity 10, and the extension direction of the first resonator 31 forms an angle with the extension direction of the second resonator 32, the two second resonators 32 can be coupled together. Furthermore, by placing the first resonator 31 at the coupling window position of the two second resonators 32, a flybar is not required between the two second resonators 32, and a resonant cavity can be omitted, resulting in a smaller overall filter size, meeting the miniaturization requirements of the product, and reducing material costs. In addition, omitting the flybar avoids adverse effects on far-end suppression, thus improving product performance.

[0062] The first resonator 31 and the second resonator 32 are, but are not limited to, resonant pillars, resonant rods, or resonant plates, etc., and can be flexibly adjusted and set according to actual needs, without limitation. In this embodiment, the first resonator 31 and the second resonator 32 are both resonant pillars, but this is not a limitation.

[0063] In the filter design, the coupling between the first resonator 31 and the second resonator 32 can be adjusted by changing the spacing between them, and the coupling between the two second resonators 32 can also be adjusted by changing the spacing between them. Of course, after the spacing between the two second resonators 32 is determined, further adjustments and optimizations can be made to the coupling between them. For example, please refer to [reference needed]. Figure 2 and Figure 5The filter also includes a cross-coupling adjustment section 40. The cross-coupling adjustment section 40 is disposed within the cavity 10, and may include, but is not limited to, being located on the bottom wall or cover plate 20 of the cavity 10; it can be flexibly adjusted and set according to actual needs. In this embodiment, the cross-coupling adjustment section 40 is specifically described as being disposed on the bottom wall of the cavity 10. The cross-coupling adjustment section 40 passes through the coupling window between the two second resonators 32. One end of the cross-coupling adjustment section 40 extends into the resonant cavity corresponding to one of the second resonators 32, and the other end extends into the resonant cavity corresponding to the other second resonator 32. The cross-coupling adjustment section 40 can adjust the coupling amount between the two second resonators 32, ensuring that the coupling amount between the two second resonators 32 meets the requirements.

[0064] Optionally, the cross-coupling adjustment part 40 is a protruding structure extending from the bottom wall of the cavity 10 or the cover plate 20. The protruding structure includes, but is not limited to, bosses, wall panels, or ribs. Furthermore, the height of the cross-coupling adjustment part 40 protruding from the bottom wall of the cavity 10 or the cover plate 20 is adjustable, and the adjustment direction is as follows: Figure 5 As indicated by the arrows, the coupling between the two second resonators 32 can be adjusted. Specifically, the greater the height of the cross-coupling adjustment part 40 protruding from the bottom wall or cover plate 20 of the cavity 10, the greater the coupling between the two second resonators 32; conversely, the smaller the height of the cross-coupling adjustment part 40 protruding from the bottom wall or cover plate 20 of the cavity 10, the smaller the coupling between the two second resonators 32. When the height of the cross-coupling adjustment part 40 protruding from the bottom wall or cover plate 20 of the cavity 10 is reduced to a minimum, i.e., the cross-coupling adjustment part 40 is flush with the bottom wall or cover plate 20 of the cavity 10, it can be understood that the cross-coupling adjustment part 40 is omitted.

[0065] Please see Figure 6 For example, the cross-coupling adjustment unit 40 includes a first coupling adjustment unit 41. The orthographic projection of the first coupling adjustment unit 41 onto the bottom wall of the cavity 10 is completely misaligned with the orthographic projections of each of the second resonators 32 onto the bottom wall of the cavity 10. Thus, when the height of the first coupling adjustment unit 41 is adjusted in a direction perpendicular to the bottom wall of the cavity 10, it will not interfere with the second resonators 32, and no short circuit will occur. The first coupling adjustment unit 41 passes through the coupling window between the two second resonators 32, with one end extending into the resonant cavity corresponding to one of the second resonators 32 and the other end extending into the resonant cavity corresponding to the other second resonator 32. Adjusting the height of the first coupling adjustment unit 41 allows for adjustment of the coupling amount between the two second resonators 32.

[0066] Based on the aforementioned embodiments, in order to further adjust and optimize the coupling amount between the two second resonators 32, the cross-coupling adjustment unit 40 further includes a second coupling adjustment unit 42. The second coupling adjustment unit 42 is connected to one end of the first coupling adjustment unit 41. Specifically, the second coupling adjustment unit 42 and the first coupling adjustment unit 41 can be spaced apart to achieve coupling connection; alternatively, they can be directly connected as a single unit. The second coupling adjustment unit 42 is arranged between the second resonator 32 and the bottom wall or cover plate 20 of the cavity 10. Specifically, taking the cross-coupling adjustment unit 40 arranged on the bottom wall of the cavity 10 as an example, both the first coupling adjustment unit 41 and the second coupling adjustment unit 42 are arranged on the bottom wall of the cavity 10, thus the second coupling adjustment unit 42 is correspondingly arranged between the second resonator 32 and the bottom wall of the cavity 10. When the height of the second coupling adjustment unit 42 is adjusted, the coupling amount between the two second resonators 32 can be adjusted.

[0067] It should be noted that the number of second coupling adjustment units 42 is not limited and can be one or two.

[0068] In one specific embodiment, there are two second coupling adjustment sections 42, and the two second coupling adjustment sections 42 are connected to the opposite ends of the first coupling adjustment section 41 in a one-to-one correspondence. Each second coupling adjustment section 42 is arranged between each second resonator 32 and the bottom wall or cover plate 20 of the cavity 10.

[0069] Based on the aforementioned embodiments, the second coupling adjustment unit 42 and the second resonator 32 can be directly connected. Specifically, as follows... Figure 2 and Figure 5 As shown, Figure 2 and Figure 5 The second coupling adjustment part 42, located to the left of the first coupling adjustment part 41, is directly connected to the second resonator 32, forming an integrated structure. More specifically, the second resonator 32 is connected to the bottom wall of the cavity 10 through the second coupling adjustment part 42, and a gap is provided between the second resonator 32 and the cover plate 20. Furthermore, the second resonator 32 and the second coupling adjustment part 42 can be made of the same material or different materials. The second resonator 32 and the second coupling adjustment part 42 can be an integrated structure or fixed by means of pins, screws, etc., without limitation. When the second resonator 32 and the second coupling adjustment part 42 are connected by different materials, it is preferable to use two metal materials with opposite frequency-temperature characteristics to separately manufacture the second resonator 32 and the second coupling adjustment part 42, so that the filter performance remains unchanged during operation in high-temperature environments.

[0070] Of course, the second coupling adjustment section 42 and the second resonator 32 can also be spaced apart along the extension direction of the second resonator 32, and then coupled together. Please refer to [further details]. Figure 2 and Figure 5 , Figure 2 and Figure 5 A gap is provided between the second coupling adjustment part 42, located to the right of the first coupling adjustment part 41, and the second resonator 32. The second resonator 32, located to the right of the first coupling adjustment part 41, is connected to the cover plate 20. The second coupling adjustment part 42, located to the left of the first coupling adjustment part 41, is directly connected to the second resonator 32, and a gap is provided between the second resonator 32, located to the left of the first coupling adjustment part 41, and the cover plate 20. Figure 2 and Figure 5 Capacitive coupling can be achieved between the two second resonators 32 in the filter shown.

[0071] Please see Figure 2 , Figure 3 or Figure 5 In some embodiments, the filter further includes an isolation section 50. The isolation section 50 is connected to the inner wall of the cavity 10 and is located between the resonant cavity corresponding to the first resonator 31 and the resonant cavity corresponding to the second resonator 32. Alternatively, the isolation section 50 can be understood as being located at the coupling window between the first resonator 31 and the second resonator 32. Thus, the isolation section 50 reduces the coupling between the first resonator 31 and the second resonator 32. The greater the protrusion height or the longer the length of the isolation section 50, the smaller the coupling between the first resonator 31 and the second resonator 32 will be.

[0072] The isolation section 50 can be disposed on the side wall of the cavity 10, the bottom wall of the cavity 10, or both the side wall and the bottom wall of the cavity 10. No restriction is imposed here.

[0073] For example, there are two isolation sections 50, each of which is located between the resonant cavity corresponding to the first resonator 31 and the resonant cavity corresponding to each of the second resonators 32.

[0074] It should be noted that the "isolation part 50" in this embodiment can be a "part of the cavity 10", that is, the "isolation part 50" and the "other parts of the cavity 10" are integrally formed; or it can be an independent component that can be separated from the "other parts of the cavity 10", that is, the "isolation part 50" can be manufactured independently and then combined with the "other parts of the cavity 10" to form a whole.

[0075] It should be noted that when the simulation design is accurate, the manufacturing precision is high enough, and the coupling amount can meet the design requirements, the isolation part 50 can be omitted.

[0076] Please see Figure 6 Based on the aforementioned embodiments, the filter further includes a coupling adjustment component 60. The coupling adjustment component 60 includes, but is not limited to, being disposed on the bottom wall of the cavity 10 or the cover plate 20. Specifically, to avoid spatial interference with the cross-coupling adjustment part 40, when the cross-coupling adjustment part 40 is disposed on the bottom wall of the cavity 10, the coupling adjustment component 60 is correspondingly disposed on the cover plate 20, thereby preventing mutual interference with the cross-coupling adjustment part 40. The coupling adjustment component 60 is located between the first resonator 31 and the second resonator 32. Thus, the coupling adjustment component 60 can further fine-tune the coupling amount between the first resonator 31 and the second resonator 32, resulting in higher adjustment accuracy of the coupling amount.

[0077] The coupling adjustment component 60 can be one or two. When there is one coupling adjustment component 60, the coupling adjustment component 60 is provided between the first resonator 31 and one of the second resonators 32, but no coupling adjustment component 60 is provided between the first resonator 31 and the other second resonator 32. When there are two coupling adjustment components 60, one coupling adjustment component 60 is provided between the first resonator 31 and each of the second resonators 32.

[0078] For example, the coupling adjustment assembly 60 includes a first adjustment rod 61, which is adjustable in position along its length on the bottom wall or cover plate 20 of the cavity 10. Thus, when the installation position is adjusted along the length of the first adjustment rod 61, the depth of insertion into the cavity 10 can be adjusted, thereby making the coupling amount between the first resonator 31 and the second resonator 32 adjustable.

[0079] Specifically, the coupling adjustment assembly 60 also includes a first adjusting nut 62. The first adjusting rod 61 is a screw, and the first adjusting nut 62 is rotatably mounted on the cover plate 20 and is also sleeved on the outside of the first adjusting rod 61. When the first adjusting nut 62 is rotated, the depth to which the first adjusting rod 61 extends into the cavity 10 can be adjusted accordingly.

[0080] Of course, when the simulation design is accurate, the machining precision is high enough, and the coupling amount can meet the design requirements, the coupling adjustment component 60 can be omitted.

[0081] Please see Figure 6 and Figure 7Based on the aforementioned embodiments, the filter further includes a first adjustment component 70. The first adjustment component 70 includes, but is not limited to, being disposed on the bottom wall of the cavity 10 or the cover plate 20. Specifically, to avoid spatial interference with the cross-coupling adjustment unit 40, when the cross-coupling adjustment unit 40 is disposed on the bottom wall of the cavity 10, the first adjustment component 70 is correspondingly disposed on the cover plate 20, thereby preventing mutual interference with the cross-coupling adjustment unit 40. The first adjustment component 70 is disposed opposite to the side wall of the first resonator 31 along its extending direction. Thus, the first adjustment component 70 can adjust the frequency of the first resonator 31.

[0082] For example, the first adjustment assembly 70 includes a second adjustment rod 71. The second adjustment rod 71 is adjustable in position along its length on the bottom wall or cover plate 20 of the cavity 10. Thus, when the installation position is adjusted along the length of the second adjustment rod 71, the depth into the cavity 10 can be adjusted, thereby making the resonant frequency of the first resonator 31 adjustable.

[0083] Specifically, the first adjustment assembly 70 also includes a second adjusting nut 72. The second adjusting rod 71 is a screw, and the second adjusting nut 72 is rotatably mounted on the cover plate 20 and is also sleeved on the outside of the second adjusting rod 71. When the second adjusting nut 72 is rotated, the depth to which the second adjusting rod 71 extends into the cavity 10 can be adjusted accordingly.

[0084] Based on the foregoing embodiment, the filter further includes a second tuning component 80. The second tuning component 80 is disposed on the sidewall of the cavity 10 opposite to the first resonator 31. The second tuning component 80 is positioned opposite the end face of the first resonator 31 along its extending direction. Thus, the second tuning component 80 can adjust the frequency of the first resonator 31.

[0085] For example, the second adjustment assembly 80 includes a third adjustment rod 81. The third adjustment rod 81 is adjustable in position along its length on the side wall of the cavity 10. Thus, when the installation position is adjusted along the length of the third adjustment rod 81, the depth into the cavity 10 can be adjusted, thereby making the resonant frequency of the first resonator 31 adjustable.

[0086] Specifically, the second adjustment assembly 80 also includes a third adjusting nut 82. The third adjusting rod 81 is a screw, and the third adjusting nut 82 is rotatably mounted on the side wall of the cavity 10, and is also sleeved on the outside of the third adjusting rod 81. When the third adjusting nut 82 is rotated, the depth to which the third adjusting rod 81 extends into the cavity 10 can be adjusted accordingly.

[0087] Based on the aforementioned embodiments, the filter further includes a third adjustment component 91. The third adjustment component 91 can adjust the frequency of the second resonator 32 so that the frequency of the second resonator 32 meets the requirements. The third adjustment component 91 is disposed on the bottom wall of the cover plate 20 or the cavity 10, and the third adjustment component 91 is positioned opposite to the free end face of the second resonator 32 along its extension direction. The free end of the second resonator 32 refers to the end that is not connected to any structure. Specifically, it can be understood according to the specific installation method of the second resonator 32 as follows: when one end of the second resonator 32 is connected to the bottom wall of the cavity 10, the free end of the second resonator 32 refers to the end of the second resonator 32 that is not connected to the bottom wall of the cavity 10, that is, the end away from the bottom wall of the cavity 10; or, when one end of the second resonator 32 is connected to the cover plate 20, the free end of the second resonator 32 refers to the end of the second resonator 32 that is not connected to the cover plate 20, that is, the end away from the cover plate 20.

[0088] For example, the third adjustment assembly 91 includes a fourth adjustment rod 911. The fourth adjustment rod 911 is adjustable in position along its length on the bottom wall of the cover plate 20 or the cavity 10. Thus, when the installation position is adjusted along the length of the fourth adjustment rod 911, the depth into the cavity 10 can be adjusted, thereby making the resonant frequency of the second resonator 32 adjustable.

[0089] Specifically, the third adjustment component 91 also includes a fourth adjusting nut 912. The fourth adjusting rod 911 is a screw, and the fourth adjusting nut 912 is rotatably mounted on the bottom wall of the cover plate 20 or the cavity 10. The fourth adjusting nut 912 is also sleeved on the fourth adjusting rod 911. When the fourth adjusting nut 912 is rotated, the depth to which the fourth adjusting rod 911 extends into the cavity 10 can be adjusted accordingly.

[0090] Specifically, when the third debugging component 91 and the second coupling adjustment part 42 are both arranged opposite to the free end face of the second resonator 32, i.e., with a gap, please refer to [reference needed]. Figure 5 The second coupling adjustment part 42, located to the right of the first coupling adjustment part 41, is spaced apart from the free end face of the second resonator 32. The second coupling adjustment part 42 is provided with a clearance hole 421, through which the fourth adjustment rod 911 passes. In this way, the clearance hole 421 serves a clearance function, ensuring that the second coupling adjustment part 42 does not interfere with the adjustment of the fourth adjustment rod 911.

[0091] Of course, when the simulation design is accurate, the machining precision is high enough, and the frequency can meet the design requirements, the first debugging component 70, the second debugging component 80, and the third debugging component 91 can be omitted.

[0092] It should be noted that the first resonator 31 in this embodiment can be directly connected to the side wall of the cavity 10 or indirectly connected to the side wall of the cavity 10. There is no limitation here, and it can be flexibly adjusted and set according to actual needs.

[0093] For example, please refer to Figure 3 The filter also includes a first connector. The first connector may include, but is not limited to, screws, pins, rivets, or snap-fit ​​components; these are not limited here and can be flexibly adjusted and set according to actual needs. The first resonator 31 is connected to the side wall of the cavity 10 via the first connector. With the fixing effect of the first connector, the first resonator 31 is securely mounted within the cavity 10.

[0094] Of course, in another embodiment, the first resonator 31 can also be indirectly installed inside the cavity 10, provided that the extension direction of the first resonator 31 is at an angle to the extension direction of the second resonator 32, and the extension direction of the first resonator 31 is parallel to or approximately parallel to the bottom wall or cover plate 20 of the cavity 10. For details, please refer to... Figure 6 and Figure 7 The filter also includes a second connector 92 and an auxiliary bracket 93. The auxiliary bracket 93 is made of conductive material and is disposed on one side of the cavity 10, and is fixedly connected to the cavity 10 via the second connector 92. The second connector 92 includes, but is not limited to, screws, pins, rivets, etc. The first resonator 31 is mounted on the auxiliary bracket 93. Thus, when it is impossible to open mounting holes on the side wall of the cavity 10, the auxiliary bracket 93 and the second connector 92 can satisfy the installation of the first resonator 31 in the cavity 10. Furthermore, during assembly, the first resonator 31 can be fixed to the auxiliary bracket 93 first, and then the auxiliary bracket 93 can be connected and fixed to the bottom wall of the cavity 10 via the second connector 92. Compared with directly fixing the first resonator 31 to the side wall of the cavity 10, this method is easier to assemble and has higher assembly efficiency.

[0095] Optionally, the auxiliary support 93 may include, but is not limited to, an L-shaped fixing piece. The L-shaped fixing piece includes a vertical fixing piece and a horizontal fixing piece, the vertical fixing piece is connected to the horizontal fixing piece, the vertical fixing piece is attached to the side wall of the cavity 10, and the horizontal fixing piece is connected and fixed to the bottom wall of the cavity 10 through the second connector 92.

[0096] Of course, as some alternative solutions, 3D printing technology can be used to fix the auxiliary bracket 93 inside the cavity 10, or casting or welding processes can be used to make the first resonator 31 and the cavity 10 an integrated structure.

[0097] Please see Figure 6For example, the filter also includes a third connector 94. The third connector 94 includes, but is not limited to, screws, pins, rivets, etc. The second resonator 32 is connected and fixed to the bottom wall or cover plate 20 of the cavity 10 via the third connector 94.

[0098] Taking the connection between the second resonator 32 and the cover plate 20 via the second connector 92 as an example, when the third connector 94 is an adjusting screw, the distance between the free end face of the second resonator 32 and the bottom wall of the cavity 10 can be adjusted by adjusting the adjusting screw, thereby achieving the adjustment of the resonant frequency. Therefore, in this case, the third adjustment component 91, which is positioned opposite to the free end face of the second resonator 32, can be omitted.

[0099] In another embodiment, this application also provides a communication device, which includes the filter of any of the above embodiments.

[0100] In the aforementioned communication device, since the first resonator 31 is mounted on the side wall of the cavity 10, and the extension direction of the first resonator 31 forms an angle with the extension direction of the second resonator 32, the two second resonators 32 can be coupled together. Furthermore, by placing the first resonator 31 at the coupling window position of the two second resonators 32, a flybar is not required between the two second resonators 32, and a resonant cavity can be omitted, resulting in a smaller overall filter size, meeting product miniaturization requirements, and reducing material costs. In addition, omitting the flybar avoids adverse effects on far-end suppression, thus improving product performance.

[0101] The following will combine Figures 10 to 15 The performance of the filter in the embodiment of this application is verified:

[0102] Please compare and refer to the following: Figure 10 and Figure 11 , Figure 10 It shows the basis Figure 5 The S-parameter diagram of the filter with a protrusion height of 3mm for the first coupling adjustment section 41 is shown. Figure 11 It shows the basis Figure 5 The S-parameter diagram of the filter with a first coupling adjustment section 41 protruding at a height of 5 mm is shown. (Comparison) Figure 10 and Figure 11 It can be seen that when the protrusion height of the first coupling adjustment part 41 increases, the coupling amount increases accordingly.

[0103] Please compare and refer to the following: Figure 11 and Figure 12 , Figure 12 The diagram shows the S-parameters of a filter according to an embodiment of this application when both second resonators 32 are connected to the bottom wall of the cavity 10. From... Figure 11It can be seen that when one second resonator 32 is connected to the bottom wall of the cavity 10 and the other second resonator 32 is connected to the cover plate 20, the zero point generated by the cross-coupling adjustment is located on the left, which can achieve capacitive coupling; from Figure 12 It can be seen that when both second resonators 32 in the filter are connected to the bottom wall of the cavity 10, the zero point generated by the cross-coupling adjustment is located on the right side, which can realize inductive coupling.

[0104] Please see Figure 8 , Figure 9 and Figure 13 , Figure 13 It shows the basis Figure 8 The S-parameter plot of the filter shown is obtained by... Figure 13 It can be seen that, Figure 8 The performance of the filter shown meets the requirements. Furthermore, a comparison... Figure 8 and Figure 9 It is evident that, for the same 10-cavity 4-zero filter, the volume size of the filter in this application is significantly smaller than that of filters in related technologies.

[0105] Please see Figure 14 and Figure 15 , Figure 14 The diagram illustrates the far-end suppression parameters of a 10-cavity, 4-zero filter with two flybars according to an embodiment of the related art. Figure 15 It shows the basis Figure 8 The diagram shows the far-end suppression parameters of the filter. In engineering applications, the flyback arm suppresses harmonics at the far end, and because the filter has two flyback arms, such as... Figure 15 As shown, resonance points occur at two frequency points, 15212MHz and 15810MHz, which have a serious impact on the communication system. However, through... Figure 15 It is known that the filter in this application does not generate harmonics before 18000MHz because it does not have a flybar.

[0106] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0107] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0108] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0109] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0110] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0111] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0112] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A filter, characterized in that, The filter includes: cavity; A cover plate, the cover plate being installed in the cavity; and A resonator assembly includes a first resonator and two second resonators. The first resonator is connected to the side wall of the cavity and is located between the two second resonators. Each second resonator is independently connected to the bottom wall of the cavity or the cover plate. The extension direction of the first resonator is set at an angle to the extension direction of the second resonator. The first resonator is coupled to the second resonator, and the two second resonators are coupled to each other.

2. The filter according to claim 1, characterized in that, The filter further includes a cross-coupling adjustment section; the cross-coupling adjustment section is disposed on the bottom wall of the cavity or the cover plate; the cross-coupling adjustment section passes through the coupling window between the two second resonators; one end of the cross-coupling adjustment section extends into the resonant cavity corresponding to one of the second resonators, and the other end of the cross-coupling adjustment section extends into the resonant cavity corresponding to the other second resonator.

3. The filter according to claim 2, characterized in that, The height of the cross-coupling adjustment part protruding from the bottom wall of the cavity or the cover plate is adjustable.

4. The filter according to claim 2, characterized in that, The cross-coupling adjustment section includes a first coupling adjustment section; the orthographic projection of the first coupling adjustment section on the bottom wall of the cavity is completely misaligned with the orthographic projection of each of the second resonators on the bottom wall of the cavity; the first coupling adjustment section passes through the coupling window between the two second resonators, one end of the first coupling adjustment section extends into the resonant cavity corresponding to one of the second resonators, and the other end of the first coupling adjustment section extends into the resonant cavity corresponding to the other second resonator.

5. The filter according to claim 4, characterized in that, The cross-coupling adjustment section further includes a second coupling adjustment section, which is connected to one end of the first coupling adjustment section. The second coupling adjustment section is arranged between the second resonator and the bottom wall of the cavity or the cover plate.

6. The filter according to claim 5, characterized in that, There are two second coupling adjustment units, and the two second coupling adjustment units are connected to the opposite ends of the first coupling adjustment unit one by one. Each second coupling adjustment unit is arranged between each second resonator and the bottom wall of the cavity or the cover plate.

7. The filter according to claim 5, characterized in that, The second coupling adjustment part is directly connected to the second resonator; or, the second coupling adjustment part and the second resonator are spaced apart along the extension direction of the second resonator.

8. The filter according to claim 1, characterized in that, The filter further includes an isolation section connected to the inner wall of the cavity, and the isolation section is located between the resonant cavity corresponding to the first resonator and the resonant cavity corresponding to the second resonator.

9. The filter according to claim 8, characterized in that, The isolation section is connected to the side wall of the cavity; and / or, there are two isolation sections, each of which is located between the resonant cavity corresponding to the first resonator and the resonant cavity corresponding to each of the second resonators.

10. The filter according to claim 1, characterized in that, The filter further includes a coupling adjustment component, which is disposed on the bottom wall of the cavity or the cover plate, and is located between the first resonator and the second resonator.

11. The filter according to claim 10, characterized in that, The coupling adjustment assembly includes a first adjustment rod, which is adjustable along its length to the bottom wall of the cavity or the cover plate.

12. The filter according to claim 1, characterized in that, The filter further includes a first debugging component, which is disposed on the bottom wall of the cavity or the cover plate, and is positioned opposite to the side wall of the first resonator along its extension direction.

13. The filter according to claim 12, characterized in that, The first debugging component includes a second adjusting rod, which is adjustable along its length to the bottom wall of the cavity or the cover plate.

14. The filter according to claim 1, characterized in that, The filter further includes a second debugging component, which is disposed on the side wall of the cavity opposite to the first resonator, and the second debugging component is disposed opposite to the end face of the first resonator along its extension direction.

15. The filter according to claim 14, characterized in that, The second adjustment component includes a third adjustment rod, which is adjustable along its length and disposed on the side wall of the cavity.

16. The filter according to claim 1, characterized in that, The filter further includes a third debugging component, which is disposed on the bottom wall of the cover plate or the cavity, and is positioned opposite to the free end face of the second resonator along its extension direction.

17. The filter according to claim 16, characterized in that, The third adjustment component includes a fourth adjustment rod, which is adjustable along its length and positioned on the cover plate or the bottom wall of the cavity.

18. The filter according to claim 1, characterized in that, The filter further includes a first connector, through which the first resonator is connected to the sidewall of the cavity; or... The filter further includes a second connector and an auxiliary bracket. The auxiliary bracket is disposed on one side of the cavity and is fixedly connected to the cavity through the second connector. The first resonator is mounted on the auxiliary bracket.

19. The filter according to claim 1, characterized in that, The filter also includes a third connector, through which the second resonator is connected and fixed to the bottom wall of the cavity or the cover plate.

20. A communication device, characterized in that, The communication device includes a filter as described in any one of claims 1 to 19.

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