Monomer resonance rod, resonance rod and radio frequency cavity filter

Abstract

The invention relates to the technical field of filters, and discloses a single resonance rod, a resonance rod and a radio frequency cavity filter, and the single resonance rod comprises a rod body part which extends along a first direction, and one end of the rod body part is used for connecting an inner cavity; the first connecting rod part is fixedly connected to the other end of the rod body part, and the first connecting rod part extends in the second direction perpendicular to the first direction; the second connecting rod part is fixedly connected to the first connecting rod part, is located on the side, away from the rod body part, of the first connecting rod part in the first direction, and extends in the opposite direction relative to the first connecting rod part, the second connecting rod part and the rod body part; the third connecting rod part is fixedly connected to the first connecting rod part through at least one second connecting rod part, the third connecting rod part at least comprises a first extending section extending in the second direction, and the first extending section is fixedly connected to the end, away from the first connecting rod part, of the second connecting rod part in the first direction. The single resonance rod is small in occupied space volume, good in heat dissipation capability and good in filtering effect.

Description

[0001] This application is a divisional application. The application number of the original application is 202110358101.6, the application date is April 1, 2021, and the invention title is "A single resonator rod, resonator rod and RF cavity filter". Technical Field

[0002] The present invention relates to the technical field of filters, and in particular to a single resonator rod, a resonator rod and an RF cavity filter. Background Art

[0003] The RF cavity filter, also known as the "radio frequency interference filter", is mainly used in electronic devices operating at high frequencies to filter and suppress signals in the useless frequency bands, thereby leaving signals in the useful frequency bands.

[0004] Existing RF cavity filters mainly include a cavity, a cover plate covering the cavity, and a resonator disposed in the cavity. The resonator is mainly a columnar structure, also known as a resonator column. Multiple resonator columns filter RF signals through capacitive coupling to obtain the desired frequency band. Existing resonator columns are mostly single-body columnar structures, which have a large internal space in the cavity, are not convenient for arranging the resonator columns in the cavity, and have poor heat dissipation ability. Especially in the field of 5G communication, the application and filtering effect of this type of RF cavity filter are greatly limited.

[0005] Therefore, there is an urgent need to provide a single resonator rod, a resonator rod and an RF cavity filter, the single resonator rod and the resonator rod of which have the advantages of small occupied space volume, good heat dissipation ability and good filtering effect. Summary of the Invention

[0006] An object of the present invention is to provide a single resonator rod, the single resonator rod of which has the advantages of small occupied space volume, good heat dissipation ability and good filtering effect.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] A single resonator rod is configured to be disposed in the inner cavity of an RF cavity filter for resonant filtering. The single resonator rod has a sheet-like structure and includes:

[0009] A rod body portion extending along a first direction, one end of the rod body portion being used for connecting to the inner cavity;

[0010] A first connecting rod portion fixedly connected to the other end of the rod body portion, and the first connecting rod portion extending along a second direction perpendicular to the first direction;

[0011] The second link part is fixedly connected to the first link part, and along the first direction, the second link part is located on the side of the first link part away from the rod body part. Relative to the first link part, the second link part and the rod body part extend in opposite directions;

[0012] The third link part is fixedly connected to the first link part through the second link part. The third link part includes a first extension section extending along the second direction, and the first extension section is fixedly connected to one end of the second link part away from the first link part.

[0013] Optionally, there are two second link parts, and the two second link parts are connected to the first link part at intervals along the second direction. The third link part is fixedly connected to the first link part through one or two of the second link parts.

[0014] Optionally, along the second direction, one end of the first link part extends out of one side of the rod body part, and the other end extends out of the other side of the rod body part.

[0015] Optionally, a plug-in block protrudes from the rod body part, and the rod body part is configured to be plugged into the inner cavity through the plug-in block.

[0016] Optionally, the second link part extends along the first direction.

[0017] Optionally, it further includes:

[0018] An input / output terminal integrally extends from the rod body part, and the input / output terminal is configured to connect to an external circuit.

[0019] Optionally, the third link part further includes a second extension section extending along the first direction, and the second extension section is fixedly connected to one end of the first extension section away from the second link part.

[0020] Optionally, the third link part further includes a third extension section extending along the second direction, and the third extension section is fixedly connected to one end of the second extension section away from the first extension section.

[0021] Another object of the present invention is to provide a resonant rod, and the resonant rod has the advantages of small occupied space volume, good heat dissipation ability and good filtering effect.

[0022] To achieve this purpose, the present invention adopts the following technical solutions:

[0023] A resonant rod includes a plurality of the single resonant rods as described above. The plurality of single resonant rods are arranged side by side and spaced apart along the second direction, and the rod bodies of the plurality of single resonant rods are connected by coupling connecting rods. The plurality of single resonant rods and the coupling connecting rods are an integrally formed metal sheet structure.

[0024] Another object of the present invention is to provide a radio frequency cavity filter, in which the resonant rod has the advantages of small occupied space volume, good heat dissipation ability and good filtering effect.

[0025] To achieve this purpose, the present invention adopts the following technical solutions:

[0026] A radio frequency cavity filter, in which a plurality of the resonant rods as described above are arranged in the inner cavity of the radio frequency cavity filter. The plurality of resonant rods are spaced apart from each other, and the first extension sections of the plurality of resonant rods are spaced apart from the side wall of the inner cavity.

[0027] The beneficial effects of the present invention:

[0028] Compared with the existing resonant columns, the single resonant rod of the present invention has a sheet structure, small occupied space volume and good heat dissipation ability. The rod body of the single resonant rod extends along the first direction, and one end of the rod body is used for fixedly connecting to the inner cavity; the first connecting rod part is fixedly connected to the other end of the rod body, and the first connecting rod part extends along the second direction perpendicular to the first direction; the second connecting rod part is fixedly connected to the first connecting rod part, and along the first direction, the second connecting rod part is located on the side of the first connecting rod part away from the rod body; the third connecting rod part is fixedly connected to the first connecting rod part through at least one second connecting rod part. The third connecting rod part at least includes a first extension section extending along the second direction, and along the first direction, the first extension section is located at the end of the third connecting rod part away from the second connecting rod part. When the single resonant rod is arranged in the inner cavity of the radio frequency cavity filter, the first extension section remains spaced apart from the side wall of the inner cavity, so as to be able to generate capacitive coupling. The single resonant rod constituted by this structure can have a good filtering effect. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of the resonant rod in Embodiment 1 provided by the present invention;

[0030] Figure 2 is a schematic structural diagram of the radio frequency cavity filter in Embodiment 1 provided by the present invention;

[0031] Figure 3 is a schematic structural diagram of the radio frequency cavity filter in Embodiment 1 provided by the present invention with the cover removed;

[0032] Figure 4 is a cross-sectional view of the radio frequency cavity filter in Embodiment 1 provided by the present invention;

[0033] Figure 5 It is a schematic structural diagram of the resonant rod in the second embodiment provided by the present invention;

[0034] Figure 6 It is a schematic structural diagram of the resonant rod in the third embodiment provided by the present invention;

[0035] Figure 7 It is a schematic structural diagram of the resonant rod in the fourth embodiment provided by the present invention;

[0036] Figure 8 It is a schematic structural diagram of the resonant rod in the fifth embodiment provided by the present invention.

[0037] In the figure:

[0038] X, the first direction; Y, the second direction;

[0039] 1, rod body part; 11, insertion block; 2, first connecting rod part; 3, second connecting rod part; 4, third connecting rod part; 41, first extension section; 42, second extension section; 43, third extension section; 5, input / output end; 6, coupling connecting rod; 7, housing; 8, cover plate; 9, partition plate. Detailed implementation manners

[0040] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific implementation manners.

[0041] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below the bottom", and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0043] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", and "right" are based on the orientation or positional relationships shown in the drawings. They are only for convenience of description and simplifying operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] Embodiment 1

[0045] As Figure 1-4 shown, this embodiment provides a single resonator rod, a resonator rod including a plurality of such single resonator rods, and a radio frequency cavity filter having the resonator rod disposed in its inner cavity. The single resonator rod and the resonator rod are both used for resonance filtering. In the figure, X represents the first direction and Y represents the second direction. In some embodiments, at least two single resonator rods are arranged side by side and spaced apart along the second direction, and the rod bodies 1 of two adjacent single resonator rods are connected by a coupling link 6. In some embodiments, a plurality of such resonator rods are disposed in the inner cavity of the radio frequency cavity filter, and the plurality of resonator rods are spaced apart from each other. The resonator rod in this embodiment specifically includes four single resonator rods. The plurality of single resonator rods of each resonator rod and the coupling link 6 between two adjacent single resonator rods are an integrally formed metal sheet structure, which has a simple structure, low manufacturing cost, and good heat dissipation performance. In other embodiments, it may also be an integrally formed injection-molded structure with a metal layer plated on its surface.

[0046] As Figure 1As shown, the single resonator rod in the resonator rod has a sheet-like structure. The single resonator rod includes a rod body portion 1, a first connecting rod portion 2, a second connecting rod portion 3, and a third connecting rod portion 4. The rod body portion 1, the first connecting rod portion 2, the second connecting rod portion 3, and the third connecting rod portion 4 are all flat. The rod body portion 1 extends in a first direction, and one end of the rod body portion 1 is used to connect to the inner cavity; the first connecting rod portion 2 is fixedly connected to the other end of the rod body portion 1, and the first connecting rod portion 2 extends in a second direction perpendicular to the first direction; the second connecting rod portion 3 is fixedly connected to the first connecting rod portion 2, and along the first direction, the second connecting rod portion 3 is located on the side of the first connecting rod portion 2 away from the rod body portion 1. Relative to the first connecting rod portion 2, the second connecting rod portion 3 and the rod body portion 1 extend in opposite directions; in some embodiments, the second connecting rod portion 3 extends in the first direction. The third connecting rod portion 4 is fixedly connected to the first connecting rod portion 2 through at least one second connecting rod portion 3 (in this embodiment, the third connecting rod portion 4 is fixedly connected to the first connecting rod portion 2 through one second connecting rod portion 3). The third connecting rod portion 4 at least includes a first extension segment 41 extending in the second direction, and along the first direction, the first extension segment 41 is fixedly connected to the end of the second connecting rod portion 3 away from the first connecting rod portion 2. When the resonator rod is disposed in the inner cavity of the radio frequency cavity filter provided in this embodiment, the first extension segment 41 of the resonator rod is spaced from the side wall of the inner cavity. Compared with the existing resonator column, the single resonator rod of this embodiment and the resonator rod have a sheet-like structure, occupy a small space volume, and have good heat dissipation ability. The first connecting rod portion 2, the second connecting rod portion 3, and the third connecting rod portion 4 located above the rod body portion 1 cooperate to form the main body portion of the single resonator rod and the resonator rod for resonance. Through the extension and spaced arrangement of the first connecting rod portion 2, the second connecting rod portion 3, and the third connecting rod portion 4 in different directions, and through the spacing and arrangement of the first connecting rod portion 2, the second connecting rod portion 3, and the third connecting rod portion 4 relative to the side walls of the inner cavity in different directions, a good filtering effect can be achieved in a relatively compact space, and there can also be good heat dissipation ability, a small volume, and a light weight.

[0047] Further, as Figure 1-4 shown, in this embodiment, a plug-in block 11 protrudes from the rod body portion 1. The rod body portion 1 can be plugged into the inner cavity through the plug-in block 11, thereby realizing position fixation. Its structure is simple, the design cost is low, and it is convenient for plugging. In some embodiments, the rod body portion 1 does not need to be plugged through the plug-in block 11, but is directly welded to the side wall of the inner cavity.

[0048] In addition, in this embodiment, among the four single resonator rods of the resonator rod, one of the single resonator rods further includes an input / output terminal 5. The input / output terminal 5 is fixedly connected to the rod body portion 1, and the input / output terminal 5 is configured to connect to an external circuit (not shown in the figure). In some embodiments, the input / output terminal 5 extends integrally from the rod body portion 1. As Figure 3-4As shown, the RF cavity filter further includes a housing 7 and a cover plate 8. The housing 7 and the cover plate 8 together form the outer shell of the RF cavity filter. The bottom plate and the side plate of the housing 7 jointly form an inner cavity. The cover plate 8 is covered on one end of the side plate of the housing 7 away from the bottom plate. The plurality of plug-in blocks 11 of the plurality of rod portions 1 of the resonant rod are inserted into the bottom plate of the housing 7. The first connecting rod portion 2, the second connecting rod portion 3, and the third connecting rod portion 4 of each single resonant rod are away from the bottom plate of the housing 7 relative to the rod portion 1, and the first connecting rod portion 2, the second connecting rod portion 3, and the third connecting rod portion 4 of each single resonant rod are close to the cover plate 8 relative to the rod portion 1. The first extension section 41 of the third connecting rod portion 4 of each single resonant rod is spaced from the side wall of the inner cavity (such as the inner walls of the bottom plate and the side plate of the housing 7 and the inner wall of the cover plate 8). The partition 9 in the housing 7 divides the inner cavity into two chambers, and one resonant rod is fixedly inserted into each of the two chambers. Each resonant rod has an input / output terminal 5. One of the two input / output terminals 5 can be used as an input terminal, and the other can be used as an output terminal, thus constituting an RF cavity filter with a filtering function. The entire RF cavity filter completely adopts resonant rods with a specific structure, thereby enabling the RF cavity filter to be optimized in the direction of miniaturization and being applicable to 5G communication devices.

[0049] Embodiment 2

[0050] As Figure 5 shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a single resonant rod with another structure and a resonant rod having the single resonant rod of this embodiment. The resonant rod includes three single resonant rods, and adjacent two single resonant rods are also connected by a coupling link 6, thereby forming an integral structure of the resonant rod. The difference between the single resonant rod of this embodiment and that of Embodiment 1 is that it includes two second connecting rod portions 3, and the two second connecting rod portions 3 are connected to the first connecting rod portion 2 at intervals in the second direction. The third connecting rod portion 4 is fixedly connected to the first connecting rod portion 2 through the two second connecting rod portions 3. The first extension section 41 of the third connecting rod portion 4 is a long strip-shaped flat rod structure extending in the second direction, and both ends of the first extension section 41 in the second direction are connected to the two second connecting rod portions 3 respectively. In some embodiments, the two second connecting rod portions 3 are connected to the opposite ends of the first connecting rod portion 2 in the second direction, and thus the first connecting rod portion 2, the two second connecting rod portions 3, and the third connecting rod portion 4 cooperate to form a "mouth"-shaped main structure for resonance. For example, as Figure 5 shown, in this embodiment, along the second direction, one end of the first connecting rod portion 2 extends out of one side of the rod portion 1, and the other end of the first connecting rod portion 2 extends out of the other side of the rod portion 1. Through optimization test, among many different forms of resonant rod structures, the resonant rod of this embodiment has a good filtering effect and is especially suitable for 5G communication devices.

[0051] Embodiment 3

[0052] As Figure 6 shown, the difference between this embodiment and the second embodiment is that this embodiment provides a monomeric resonant rod with another structure and a resonant rod having the monomeric resonant rod of this embodiment. The difference between the monomeric resonant rod of this embodiment and the second embodiment is that only one end of the two ends of the third link portion 4 along the second direction is connected to one of the second link portions 3, and one end of the first extension segment 41 along the second direction is connected to one of the second link portions 3, thereby forming a "mouth" - shaped structure with a notch as Figure 6 shown, and the notch is located on the side of the first link portion 2 facing away from the rod body portion 1. Similarly, through experimental tests, it also has good filtering effects, especially applicable in 5G communication devices.

[0053] Embodiment Four

[0054] As Figure 7 shown, the difference between this embodiment and the first embodiment is that this embodiment provides a monomeric resonant rod with another structure and a resonant rod having the monomeric resonant rod of this embodiment. The resonant rod includes three monomeric resonant rods, and adjacent two monomeric resonant rods are also connected by a coupling link 6, thereby forming an integral structure of the resonant rod. For example, as Figure 7 shown, in this embodiment, along the second direction, one end of the first link portion 2 extends out of one side of the rod body portion 1, and the other end of the first link portion 2 extends out of the other side of the rod body portion 1. And the third link portion 4 has an "L" - shaped structure rotated 90 degrees to the right. The third link portion 4 includes a first extension segment 41 extending along the second direction and a second extension segment 42 extending along the first direction. The second extension segment 42 is fixedly connected to the end of the first extension segment 41 away from the second link portion 3. The second extension segment 42 and the first extension segment 41 form an "L" - shaped structure rotated 90 degrees to the right, and the first link portion 2, the second link portion 3, and the third link portion 4 cooperate to form a "mouth" - shaped structure with a notch, and the notch is located on one side of the first link portion 2 along the first direction. Similarly, through experimental tests, it also has good filtering effects, especially applicable in 5G communication devices.

[0055] Embodiment Five

[0056] As Figure 8 shown, the difference between this embodiment and the first embodiment is that this embodiment provides a monomeric resonant rod with another structure and a resonant rod having the monomeric resonant rod of this embodiment. The resonant rod includes three monomeric resonant rods, and adjacent two monomeric resonant rods are also connected by a coupling link 6, thereby forming an integral structure of the resonant rod. More specifically, as Figure 8As shown in the figure, in this embodiment, along the second direction, one end of the first link portion 2 extends out of one side of the rod body portion 1, and the other end of the first link portion 2 extends out of the other side of the rod body portion 1. The second link portion 3 is connected to one end of the first link portion 2 along the second direction, and the third link portion 4 has a "U" - shaped structure rotated 90 degrees to the right. For example, the third link portion 4 includes a first extension segment 41 extending along the second direction, a second extension segment 42 extending along the first direction, and a third extension segment 43 extending along the second direction. The second extension segment 42 is fixedly connected to one end of the first extension segment 41 away from the second link portion 3, and the third extension segment 43 is fixedly connected to one end of the second extension segment 42 away from the first extension segment 41. The third link portion 4 is integrally connected to one end of the second link portion 3 away from the first link portion 2, and the first link portion 2, the second link portion 3, and the third link portion 4 cooperate to form an "S" - shaped structure. Similarly, through experimental tests, it also has a good filtering effect.

[0057] In summary, Embodiments 1 to 5 of the present invention provide five different - structured resonant rods and single - body resonant rods, and their structures and connection relationships of the first link portion 2, the second link portion 3, and the third link portion 4 are optimized and adjusted. The rod body portion 1 extends along the first direction, and one end of the rod body portion 1 is used for fixedly connecting to the inner cavity; the first link portion 2 is fixedly connected to the other end of the rod body portion 1, and the first link portion 2 extends along the second direction perpendicular to the first direction; the second link portion 3 is fixedly connected to the first link portion 2, and along the first direction, the second link portion 3 is located on the side of the first link portion 2 away from the rod body portion 1; the third link portion 4 is fixedly connected to the first link portion 2 through at least one second link portion 3. The third link portion 4 at least includes a first extension segment 41 extending along the second direction, and along the first direction, the first extension segment 41 is located at one end of the third link portion 4 away from the second link portion 3. Their first link portion 2, second link portion 3, and third link portion 4 form a main structure for resonance. The single - body resonant rod and the resonant rod can obtain good filtering effects, especially suitable for use in 5G communication devices.

[0058] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A single resonant rod, configured to be disposed in the inner cavity of a radio frequency cavity filter for resonant filtering, characterized in that The single resonator rod has a sheet-like structure, and the single resonator rod includes: A rod body portion that extends along a first direction, and one end of the rod body portion is used to connect to the inner cavity; A first connecting rod portion that is fixedly connected to the other end of the rod body portion, and the first connecting rod portion extends along a second direction perpendicular to the first direction; A second connecting rod portion that is fixedly connected to the first connecting rod portion, and along the first direction, the second connecting rod portion is located on the side of the first connecting rod portion away from the rod body portion. Relative to the first connecting rod portion, the second connecting rod portion and the rod body portion extend in opposite directions; A third connecting rod portion that is fixedly connected to the first connecting rod portion through the second connecting rod portion. The third connecting rod portion includes a first extension section that extends along the second direction, and the first extension section is fixedly connected to the end of the second connecting rod portion away from the first connecting rod portion.

2. The single resonant rod according to claim 1, characterized in that, There are two second connecting rod portions, and the two second connecting rod portions are connected to the first connecting rod portion at intervals along the second direction. The third connecting rod portion is fixedly connected to the first connecting rod portion through one or two of the second connecting rod portions.

3. The monomer resonance rod according to claim 1, wherein Along the second direction, one end of the first connecting rod portion extends out of one side of the rod body portion, and the other end extends out of the other side of the rod body portion.

4. The single resonant rod according to claim 1, wherein A plug-in block protrudes from the rod body portion, and the rod body portion is configured to be plugged into the inner cavity through the plug-in block.

5. The monomer resonant rod according to claim 1, wherein The second connecting rod portion extends along the first direction.

6. The single resonant rod according to claim 1, wherein, It further includes: An input / output terminal that integrally extends from the rod body portion, and the input / output terminal is configured to connect to an external circuit.

7. The single resonant rod according to claim 1, wherein The third connecting rod portion further includes a second extension section that extends along the first direction, and the second extension section is fixedly connected to the end of the first extension section away from the second connecting rod portion.

8. The monomer resonance rod according to claim 7, wherein The third connecting rod portion further includes a third extension section that extends along the second direction, and the third extension section is fixedly connected to the end of the second extension section away from the first extension section.

9. A resonant rod, characterized in that, It includes a plurality of single resonator rods according to any one of claims 1-8. The plurality of single resonator rods are arranged side by side and at intervals along the second direction, and the rod body portions of the plurality of single resonator rods are connected by coupling connecting rods. The plurality of single resonator rods and the coupling connecting rods are an integrally formed metal sheet-like structure.

10. A radio frequency cavity filter, characterized in that, In the inner cavity of the radio frequency cavity filter, there are a plurality of resonator rods according to claim 9. The plurality of resonator rods are arranged at intervals from each other, and the first extension sections of the plurality of resonator rods are spaced from the side wall of the inner cavity.

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