Cavity filter for antenna

Abstract

This invention relates to a cavity filter for antennas. Specifically, the invention includes: a filter body having multiple cavities, one side of which is open and divided by a partition; resonant rods respectively disposed in the multiple cavities; a resonant rod boss into which a portion of the resonant rod is inserted, such that the resonant rod is disposed in the cavity; and a tolerance management stop disposed between the inner circumferential surface of the resonant rod boss and the outer circumferential surface of the resonant rod, which performs a movement and stop function along the insertion direction of the resonant rod when designing the resonance of the cavity. This provides the advantage of improving the overall production yield of the product.

Description

Technical Field

[0001] This invention relates to a cavity filter for antennas, and more specifically, to a cavity filter for antennas that can expand the allowable range of design tolerances for components within the cavity. Background Technology

[0002] The content described in this section is merely to provide background information about this embodiment and does not constitute prior art.

[0003] Multiple-input multiple-output (MIMO) technology is a breakthrough technique that uses multiple antennas to significantly increase data transmission capacity. The transmitter transmits different data through various transmit antennas, and the receiver uses appropriate signal processing to distinguish the transmitted data using spatial multiplexing. Therefore, as the number of transmit and receive antennas increases synchronously, channel capacity increases, allowing for the transmission of more data. For example, increasing the number of antennas to 10 can ensure approximately 10 times the channel capacity using the same frequency band compared to a current single-antenna system.

[0004] In 4G LTE-advanced technology, a maximum of eight antennas can be used. Currently, in the pre-5G stage, products with 64 or 128 antennas are being developed. It is expected that 5G will use base station equipment with even more antennas, a technology known as Massive MIMO (Multi-Input Multiple-Output) technology. Current cells operate in two dimensions; in contrast, with the introduction of Massive MIMO technology, three-dimensional beamforming can be used. This Massive MIMO technology is also called Full Dimension MIMO (FD-MIMO).

[0005] In large-scale antenna arrays (MLAs), the number of antenna components increases, as does the number of transceivers and filters. Furthermore, based on 2014 data, South Korea had over 200,000 base stations. This necessitates a cavity filter structure that minimizes installation space and facilitates installation, along with a connection structure for RF signal lines that provides the same filter characteristics when the individually tuned cavity filter is installed behind the antenna.

[0006] An RF filter with a cavity structure is characterized by a resonator inside a box-shaped structure formed by a metal conductor, consisting of a resonant rod (or resonant bar) acting as a conductor. Only the electromagnetic field at its natural frequency exists there, and through resonance, only the characteristic frequency at extremely high frequencies passes through. This type of cavity-structured bandpass filter has low insertion loss, which is beneficial for high output, and it is widely used as a filter in mobile communication base station antennas.

[0007] However, RF filters with cavity structures have the following problems: in terms of frequency tuning design within the cavity, when manufacturing the resonator placed within the cavity, it is necessary to manufacture it precisely within the design tolerance range (i.e., the variable range of the tuning design).

[0008] For example, if the resonator (resonance rod) is manufactured beyond the above-mentioned design tolerance range, the following problem arises: when tuning the frequency in the actual cavity, post-processing is required to bring it into the frequency tuning design range. Summary of the Invention

[0009] Technical issues

[0010] The present invention is intended to solve the technical problems described above. The object of the present invention is to provide a cavity filter for antennas that can expand the tolerance range during the manufacture of resonators and is easy to design for frequency tuning within the cavity.

[0011] The technical problems of this invention are not limited to those mentioned above. Other technical problems not mentioned can be clearly understood by those skilled in the art through the following description.

[0012] Technical solution

[0013] An embodiment of the present invention provides an antenna cavity filter comprising: a filter body having a plurality of cavities, one side of which is open and divided by a partition; resonant rods respectively disposed in the plurality of cavities; a resonant rod boss into which a portion of the resonant rod is inserted, such that the resonant rod is disposed in the cavity; and a tolerance management stop portion disposed between the inner peripheral surface of the resonant rod boss and the outer peripheral surface of the resonant rod, which performs a movement and stop function along the insertion direction of the resonant rod when designing the resonance of the cavity.

[0014] The resonant rod boss can protrude from the bottom surface of the cavity along one side and form an internally empty circular tube.

[0015] Furthermore, it may also include a welding part, which is applied to the front end of the resonance rod boss and cured after being temporarily fixed by the tolerance management stop part to the design position of the resonance design.

[0016] Furthermore, the aforementioned welded portion can be coated and cured to conceal the aforementioned tolerance management stop portion from the outside.

[0017] Furthermore, the aforementioned tolerance management stop can be integrally formed on the outer peripheral surface of the resonance rod that is inserted toward the inner peripheral surface of the resonance rod boss.

[0018] Furthermore, the aforementioned tolerance management stop may have a pleated shape, and at least the diameter of the outer peripheral surface that contacts the inner peripheral surface of the aforementioned resonance rod boss has a size that forcibly snaps into the inner peripheral surface of the aforementioned resonance rod boss.

[0019] Furthermore, the aforementioned tolerance management stop can be a friction component disposed between the inner peripheral surface of the aforementioned resonance rod boss and the outer peripheral surface of the aforementioned resonance rod.

[0020] Furthermore, the aforementioned friction component may include a wrinkled portion located on the outer peripheral surface of the aforementioned resonance rod, the outer side of which applies pressure to the inner peripheral surface of the aforementioned resonance rod boss, and the inner side of which applies pressure to the outer peripheral surface of the aforementioned resonance rod.

[0021] Furthermore, the aforementioned friction component may also include a plurality of cut portions spaced apart along the circumferential direction on one side of the aforementioned wrinkled portion.

[0022] Furthermore, the aforementioned friction component may also include a support plate portion integrally formed on the other side of the aforementioned wrinkled portion, so as to surround the front end of the aforementioned resonant rod together with the aforementioned wrinkled portion.

[0023] Furthermore, the aforementioned resonant rod boss can protrude from the bottom surface of the aforementioned cavity along the aforementioned lateral direction to form a cylindrical shape.

[0024] Furthermore, the aforementioned tolerance management stop may have a pleated shape, and at least the diameter of the inner peripheral surface that contacts the outer peripheral surface of the aforementioned resonant rod boss has a size that forcibly snaps into the outer peripheral surface of the aforementioned resonant rod boss.

[0025] Furthermore, the aforementioned tolerance management stop can be a friction component disposed between the outer peripheral surface of the aforementioned resonance rod boss and the inner peripheral surface of the aforementioned resonance rod.

[0026] Furthermore, the aforementioned friction component may include a wrinkled portion located on the inner circumferential surface of the resonant rod, the outer side of which applies pressure to the inner circumferential surface of the resonant rod boss, and the inner side of which applies pressure to the outer circumferential surface of the resonant rod.

[0027] Furthermore, the aforementioned friction component may also include: a support plate portion integrally formed on the other side of the aforementioned wrinkled portion, arranged together with the aforementioned wrinkled portion around one end of the aforementioned resonance rod boss; and a plurality of cut portions that separate a portion of the edge end of the aforementioned support plate portion and the aforementioned wrinkled portion along the circumferential direction.

[0028] Furthermore, the aforementioned resonant rod boss can be cylindrical in shape, with its diameter gradually decreasing from the bottom surface of the cavity along one side. The aforementioned tolerance management stop is formed by a rib shape protruding from the inner circumference of the resonant rod towards the center, and multiple protruding ribs spaced along the circumferential direction are integrally formed on the inner circumferential surface of the resonant rod.

[0029] Furthermore, it may also include a filter cover covering the open side of the cavity. The resonance design of the cavity space can be achieved by repeatedly moving and stopping the resonance rod, which is provided with the tolerance management stop, through an external pressing member inserted through a design hole. The design hole is formed in a design cover that performs the same covering function as the filter cover.

[0030] The effects of the invention

[0031] According to an embodiment of the present invention, an antenna cavity filter can achieve the following various effects.

[0032] First, after designing the mold for the resonant rod, the post-processing steps to meet the tuning dimensions within the cavity can be omitted.

[0033] Secondly, the design tolerance of the resonance rod can be expanded compared to the past.

[0034] Third, since the weight of the resonant rod can be supported by the welded part, it is sufficient to manufacture a thinner resonant rod.

[0035] Fourth, by omitting the post-processing of the resonance rod and reducing its thickness, processing costs and expenses can be saved, resulting in a high production yield. Attached Figure Description

[0036] Figure 1 This is a schematic diagram showing a portion of the external shape of the cavity filter for antennas according to the present invention.

[0037] Figure 2 For along Figure 1 The cut perspective view of the AA wire cut in the figure shows the cut perspective view of the tolerance management stop portion of the first embodiment of the structure of the cavity filter for antenna according to an embodiment of the present invention.

[0038] Figure 3 For along Figure 1 A cross-sectional view of the AA line cut in the image.

[0039] Figure 4 For along Figure 1 The exploded 3D diagram of the AA line cutting process.

[0040] Figures 5a to 5c An exploded cross-sectional view showing the sequence of resonant rods placed within the cavity.

[0041] Figure 6 For along Figure 1 The cut perspective view of the AA wire cut in the figure shows the cut perspective view of the tolerance management stop portion in the second embodiment of the structure of the cavity filter for antenna according to an embodiment of the present invention.

[0042] Figure 7 for Figure 6 A sectional view.

[0043] Figure 8 for Figure 6 The cut-out 3D diagram.

[0044] The image shows 9 along... Figure 1 The perspective view of the AA line cut in the figure shows a perspective view of the tolerance management stop portion of the third embodiment of the structure of the cavity filter for antenna according to an embodiment of the present invention.

[0045] Figure 10 for Figure 9 A sectional view.

[0046] Figure 11 for Figure 9 The cut-out 3D diagram.

[0047] Figure 12 For along Figure 1 The cut perspective view of the AA wire cut in the figure shows the cut perspective view of the tolerance management stop portion in the fourth embodiment of the structure of the cavity filter for antenna according to an embodiment of the present invention.

[0048] Figure 13 for Figure 12 A sectional view.

[0049] Figure 14 for Figure 6 The cut-out 3D diagram.

[0050] Figure 15 For along Figure 1 The cut perspective view of the AA wire cut in the figure shows the cut perspective view of the tolerance management stop portion in the fifth embodiment of the structure of the cavity filter for antenna according to an embodiment of the present invention.

[0051] Figure 16 for Figure 15 A sectional view.

[0052] Figure 17 for Figure 15 The cut-out 3D diagram.

[0053] Explanation of reference numerals in the attached figures

[0054] 1: Cavity filter for antenna; 10: Filter body

[0055] 20: Filter cover 25: Engraving section

[0056] 30, 30-T, 30-P: Resonance rod boss; 31-I: Inner circumferential surface of the resonance rod boss.

[0057] 31-O: Outer peripheral surface of the resonant rod boss; 40: Resonant rod

[0058] 41: Stop setting end; 50: Tolerance management stop.

[0059] 51a: outer diameter 52a: inner diameter

[0060] 60: Welding section; 70: Design cover

[0061] 80: Externally pressed component C: Cavity Detailed Implementation

[0062] Hereinafter, a cavity filter for an antenna according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0063] In assigning reference numerals to structural elements in the various figures, the same reference numerals are assigned to the same structural elements as much as possible, even if they appear in different figures. Furthermore, in describing embodiments of the present invention, detailed descriptions of related well-known structures or functions are omitted if it is determined that such detailed descriptions may hinder understanding of the embodiments of the present invention.

[0064] In describing the structural elements of the embodiments of the present invention, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are only used to distinguish a structural element from other structural elements, and the nature, sequence, or order of the corresponding structural elements is not limited by their terminology. Furthermore, unless otherwise defined, the meanings of all terms used in the specification, including technical or scientific terms, are the same as those commonly understood by one of ordinary skill in the art to which this invention pertains. Multiple terms whose commonly used meanings are the same as those defined in dictionaries should be interpreted as having the same meaning as the related art in the context, and should not be interpreted in an idealized or overly formalized sense unless explicitly defined in this application.

[0065] Figure 1 This is a schematic diagram showing a portion of the external shape of the cavity filter for antennas according to the present invention. Figure 2 For along Figure 1 The 3D diagram of the AA wire cutting process. Figure 3 For along Figure 1 A cross-sectional view of the AA line cut in the image. Figure 4 For along Figure 1 The exploded 3D diagram of the AA line cutting process.

[0066] like Figures 1 to 4 As shown, an antenna cavity filter 1 according to an embodiment of the present invention includes a filter body 10, a cavity C open on one side, and a filter cover 20 covering one side of the open cavity C of the filter body 10.

[0067] The filter body 10 may have multiple cavities C divided by partitions (not shown). These cavities C can be frequency-tuned so that only individual specific frequencies can pass through. In various embodiments of the invention and the illustrated figures, although only one cavity C is shown, the multiple cavities C shown can be continuously arranged to constitute the filter body 10. Therefore, it can be understood that the structure that divides the cavities C within the filter body 10 can be used as the aforementioned partitions.

[0068] The filter body 10 can be formed entirely of a dielectric material, and a metal film can be formed on the internal surface of the cavity C and the parts forming the exterior, so that only an electromagnetic field of the inherent frequency exists in the cavity C.

[0069] For ease of explanation, such as Figures 1 to 4 As shown, in an embodiment of the antenna cavity filter 1 of the present invention, a filter body 10 having a single cavity C will be described as an example. The shape of each cavity C provided in the filter body 10 can be formed in different shapes according to the design value of a specific frequency. However, as will be described later, the description will be based on the premise that the resonant rod 40 and the resonant rod boss 30 for providing the resonant rod 40 must be provided.

[0070] Among them, such as Figures 1 to 4 As shown, an antenna cavity filter 1 according to an embodiment of the present invention may further include: a resonant rod 40, which is respectively disposed in a plurality of cavities C; a resonant rod boss 30, which inserts a portion of the resonant rod 40 therein, so that the resonant rod 40 is disposed in the cavity C.

[0071] The resonant rod 40 is made of metal and is one of the main components of the filter that enables frequency tuning design within the cavity C, based on the space (or distance) between the filter cover 20 and the resonant rod 40.

[0072] like Figures 2 to 4 As shown, the resonant rod 40, which performs the function described above, can be adjusted according to the distance between the inner side of the filter cover 20, which varies in height from the closed bottom surface to the open side in the cavity C of the filter body 10, to achieve frequency tuning.

[0073] More specifically, a portion of the other front end of the resonant rod 40 can be inserted and fixed into the resonant rod boss 30 disposed on the bottom surface of the cavity C of the filter body 10. The spacing between the front end of one side of the resonant rod 40 and the filter cover 20 changes with the amount of insertion of the resonant rod 40 relative to the resonant rod boss 30, and the frequency tuning design can be determined according to the changing spacing.

[0074] As mentioned above, roughly as Figures 2 to 4 As shown, the resonant rod bosses 30 and 30T (Tube) can be arranged in such a way that the resonant rod 40 is set inside the cavity C, forming an internally empty circular tube. When manufacturing the resonant rod bosses 30 and 30T using the filter body 10 mold, the resonant rod bosses 30 and 30T can be integrally formed with the filter body 10 inside the cavity C.

[0075] However, the resonant rod boss 30 is not necessarily integrally formed with the filter body 10; it can be manufactured separately from the filter body 10, allowing for disassembly and assembly within the cavity C of the filter body 10. Furthermore, the resonant rod boss 30 is not necessarily formed in a circular tubular shape, as described later. Figures 12 to 17 The tolerance management stop portion in the structure of the cavity filter for antenna of one embodiment of the present invention shown in the figure (fourth embodiment and fifth embodiment) may have a cylindrical shape that protrudes from the bottom surface of the cavity C along the open side direction (see reference). Figures 12 to 14 ), or formed with a cylindrical shape whose diameter gradually decreases from the bottom surface of cavity C along the open side (see reference). Figures 15 to 17 (Refer to the attached diagram labeled "30-P"), the lower end of the resonant rod 40 is inserted and engaged around the outer circumferential surface of one end of the cylindrical resonant rod boss 30-P. This will be explained in more detail below.

[0076] At the same time, such as Figures 2 to 4 As shown, the cavity filter 1 for antennas according to an embodiment of the present invention may further include a tolerance management stop portion 50a. Hereinafter, Figures 2 to 4 The tolerance management stop portion 50a shown is referred to as the "tolerance management stop portion of the first embodiment" and is indicated by reference numeral "50a" to distinguish it from the second and third embodiments described below.

[0077] like Figures 2 to 4 As shown, the tolerance management stop 50a of the first embodiment can be disposed between the inner peripheral surface 31-I(In) of the resonance rod boss 30-T and the outer peripheral surface of the resonance rod 40. When designing the resonance of the cavity C, the tolerance management stop 50a of the first embodiment, as described above, performs a movement and stop function along the insertion direction of the resonance rod 40.

[0078] More specifically, if a specified external force is applied to the resonant frequency of the tunable cavity C, the resonant rod 40 is fixed in a manner that allows it to move within the cavity C of the filter body 10 relative to the resonant rod boss 30-T. As described above, the resonant rod 40 achieves resonant frequency tuning through its movement within the cavity C via the resonant rod boss 30-T.

[0079] In the first embodiment, the tolerance management stop 50a works as follows: if the resonance designer applies an external force greater than a specified force in order to tune the resonance frequency, it moves; if the external force is removed, it stops relative to the resonance rod boss 30-T and serves as a temporary fixation.

[0080] As described above, the cavity filter 1 for antennas according to an embodiment of the present invention can expand the design tolerance of the resonant rod 40 compared to the past by having the tolerance management stop 50a of the first embodiment. That is, by further expanding the preset design tolerance range, not only is precise manufacturing design not required when manufacturing the resonant rod 40, but also the post-processing of the resonant rod 40 is omitted when tuning the resonant frequency in the cavity C.

[0081] On the other hand, such as Figures 2 to 4 As shown, the cavity filter 1 for antennas in one embodiment of the present invention may further include a welding part 60. If the resonant rod 40 is temporarily fixed to the design position of the resonant design by the tolerance management stop part 50a of the first embodiment, it is cured after being coated on the front end of the resonant rod boss 30-T, so that the resonant rod 40 is completely fixed.

[0082] As described above, the tolerance management stop 50a of the first embodiment temporarily fixes the resonance rod 40 at a specified position of the resonance rod boss 30-T designed according to the resonance frequency tuning, thus fulfilling its function. The resonance rod 40 is completely fixed to the temporary fixed position of the resonance rod boss 30-T by the welding part 60.

[0083] The weld portion 60 can conceal the tolerance management stop portion 50a of the first embodiment from the outside through coating and curing. While concealing the tolerance management stop portion 50a of the first embodiment from the outside, the weld portion 60 can be made of any material, within the limit of not affecting the resonant frequency tuning design within the cavity C. For example, the weld portion 60 can be made not only of fusible lead, but also of conventional adhesive materials.

[0084] This weld 60 can be circumferentially coated on the area where the height difference is formed between the front end of the resonant rod boss 30-T and the outer peripheral surface of the resonant rod 40 and cured, so that the resonant rod 40 is firmly fixed to the resonant rod boss 30-T.

[0085] On the other hand, in the first embodiment, the tolerance management stop 50a is integrally formed on the outer peripheral surface of the resonance rod 40 inserted toward the inner peripheral surface 31-I side of the resonance rod boss 30-T (see below). Figures 6 to 8 The second and third embodiments shown are illustrated.

[0086] Furthermore, the tolerance management stop 50a of the first embodiment can be manufactured separately and first attached to the resonant rod boss 30, and then forcibly snapped into the inner side attached to the resonant rod boss 30-T (see reference). Figures 1 to 4 And as will be discussed later Figures 9 to 11 (The third embodiment shown). That is, the tolerance management stop 50a of the first embodiment can be a friction member disposed between the inner peripheral surface 31-I of the resonance rod boss 30-T and the outer peripheral surface of the resonance rod 40.

[0087] The second embodiment of the tolerance management stop part 50a described above, and a detailed description of the second embodiment, will be provided later.

[0088] Figures 5a to 5c An exploded cross-sectional view showing the sequence in which the resonant rods 40 are arranged within the cavity C.

[0089] Reference Figures 5a to 5c Briefly explain the state of setting up the resonant rod 40 inside the cavity C.

[0090] first, Figure 5a With the filter cover 20 removed from the filter body 10, the tolerance management stop 50a of the first embodiment is positioned on the open upper side of the resonance rod boss 30-T, with the stop provided at the front end of the other side of the resonance rod 40.

[0091] Moreover, such as Figure 5b As shown, a portion of the other front end of the resonant rod 40 is forcibly snapped into the inside of the resonant rod boss 30-T for connection. At this time, the tolerance management stop 50a of the first embodiment, which is integrally provided on the other front end of the resonant rod 40 or separately provided, can move along the resonant rod boss 30-T when the external force provided by the assembler (resonant frequency tuning designer) is above the specified external force. If the external force applied by the assembler is removed at any position, the movement stops and is temporarily fixed.

[0092] Finally, as Figure 5cAs shown, the welding portion 60 can be applied in a ring shape to the area where the height difference is formed between the front end of the resonant rod boss 30-T and the resonant rod 40. After application and curing, the tolerance management stop portion 50a of the first embodiment is concealed from the outside, thus firmly fixing the resonant rod 40 to the tuning design position of the resonant frequency. The weight of the resonant rod 40 only needs to be sufficiently secured by the welding portion 60 to prevent detachment, thus offering the advantage of manufacturing it with a thinner thickness than before. Manufacturing a thinner resonant rod 40 inevitably leads to cost savings.

[0093] Especially in cases like Figure 5b and 5c During the assembly of the resonant rod 40 shown, the first tuning design of the resonant frequency within the cavity C can be performed. In this case, a design cover 70 that performs the same covering function as the filter cover 20 is provided instead of the filter cover 20. An external press-in component 80, inserted through a pre-defined design hole in the design cover 70, is used to press the tolerance management stop 50a of the first embodiment onto the [the cavity]. Figure 5b The resonant rod 40 in the state shown is moved by applying an external force greater than a specified external force, and stopped by removing the external force. The first tuning design of the resonant frequency is achieved by repeating this operation.

[0094] Furthermore, although not illustrated, as described above, after the first tuning design of the resonant frequency is completed, the design cover 70 is removed, and the filter cover 20 is combined. Then, by using a prescribed engraving tool formed on the engraving part 25 of the filter cover 20, engraving is performed from the outside into the cavity C. The engraving action is carried out in a manner that reflects the change in shape of the filter cover 20.

[0095] Figure 6 For along Figure 1 The AA wire-cut perspective view shows a cut perspective view of the tolerance management stop portion in the second embodiment of the structure of an antenna cavity filter according to an embodiment of the present invention. Figure 7 for Figure 6 sectional view, Figure 8 for Figure 6 The cut-out 3D diagram.

[0096] like Figures 2 to 4 As shown, in an embodiment of the cavity filter 1 for antennas of the present invention, the tolerance management stop 50a of the first embodiment is manufactured separately from the resonant rod 40. For the first tuning design of the resonant frequency within the cavity C, it is configured as a structure between the inner peripheral surface 31-I of the resonant rod boss 30-T and the outer peripheral surface of the resonant rod 40. However, as... Figures 2 to 4 As shown, the tolerance management stop 50a in the first embodiment does not necessarily have to be manufactured separately.

[0097] That is, such as Figures 6 to 8 As shown, in the second embodiment, the tolerance management stop 50b can also be integrally formed on the outer peripheral surface (especially the outer peripheral surface of the other front end) of the resonant rod 40 inserted along the inner peripheral surface 31-I side of the resonant rod boss 30-T. Hereinafter, for ease of explanation, Figures 2 to 4 The tolerance management stop 50 shown is named "Tolerance Management Stop 50a of the First Embodiment". Figures 6 to 8 The tolerance management stop 50b shown is named "Tolerance Management Stop 50b of the Second Embodiment".

[0098] like Figures 4 to 8 As shown, both the tolerance management stop portion 50a of the first embodiment and the tolerance management stop portion 50b of the second embodiment can have a pleated shape, and the diameter of the outer peripheral surface that contacts the inner peripheral surface 31-I of the resonance rod boss 30-T is large enough to be forcibly fastened into the inner peripheral surface 31-I of the resonance rod boss 30-T.

[0099] Among them, such as Figure 4 As shown, the tolerance management stop 50a of the first embodiment may also include a wrinkled part 50a-1. When it is provided as a separate friction member, the outer side of the outer peripheral surface of the resonance rod 40 applies pressure to the inner peripheral surface 31-I of the resonance rod boss 30-T, and the inner side applies pressure to the outer peripheral surface of the resonance rod 40.

[0100] Preferably, in the wrinkled shape of the wrinkle portion 50a-1, the inner diameter 52a of at least the inner peripheral surface that contacts the outer peripheral surface of the resonance rod 40 has a size that forcibly snaps into the outer peripheral surface of the resonance rod 40. Furthermore, preferably, in the wrinkled shape of the wrinkle portion 50a-1, the outer diameter 51a of at least the outer peripheral surface that contacts the inner peripheral surface 31-I of the resonance rod boss 30-T has a size that forcibly snaps into the inner peripheral surface 31-I of the resonance rod boss 30-T.

[0101] Therefore, when the tolerance management stop 50a of the first embodiment is first attached to the resonance rod 40, it is forcibly fastened to the resonance rod 40 by the size of its inner diameter 52a, thereby firmly and tightly attached. Then, it is forcibly fastened to the inner circumferential surface 31-I of the resonance rod boss 30-T by the size of the outer diameter 51a, thereby firmly and tightly attached. Thus, temporary fixation is achieved by the specified friction force.

[0102] On the contrary, such as Figures 6 to 8 As shown, in the second embodiment, the tolerance management stop 50b can be integrally formed on the resonance rod 40, without causing slippage relative to the resonance rod 40. It is forcibly snapped into the inner circumferential surface 31-I of the resonance rod boss 30-T by the size of its outer diameter, and temporary fixation is achieved by the specified friction force.

[0103] Figure 9 For along Figure 1 The three-dimensional view of the AA wire cut in the figure shows a cut-out perspective view of the tolerance management stop portion in the third embodiment of the structure of the cavity filter for antenna according to an embodiment of the present invention. Figure 10 for Figure 9 sectional view, Figure 11 for Figure 9 The cut-out 3D diagram.

[0104] like Figures 9 to 11 As shown, as a variation of the tolerance management stop 50a of the first embodiment described above, the tolerance management stop 50c of the third embodiment is disclosed.

[0105] That is, such as Figures 9 to 11 As shown, the tolerance management stop 50c of the third embodiment may include: a wrinkle portion 50c-1, located on the outer peripheral surface of the resonance rod 40, the outer side of which presses against the inner peripheral surface 31-I of the resonance rod boss 30-T, and the inner side of which presses against the outer peripheral surface of the resonance rod 40; a plurality of cut portions 50c-2, which are cut apart along the circumferential direction on one side of the wrinkle portion 50c-1; and a support plate portion 50c-3, integrally formed on the other side of the wrinkle portion 50c-1, and arranged to surround the front end of the resonance rod 40 together with the wrinkle portion 50c-1.

[0106] One side of the wrinkled portion 50c-1 indicates the direction in which it is combined with the filter cover 20, and the other side of the wrinkled portion 50c-1 indicates the direction corresponding to the front end of the resonant rod 40.

[0107] The wrinkled portion 50c-1, which includes multiple cut portions 50c-2, can be located between the outer peripheral surface of the resonance rod 40 and the inner peripheral surface 31-I of the resonance rod boss 30-T. It can undergo elastic deformation by external force provided by the assembler (or resonance tuning designer), which makes it easier to forcefully snap into place.

[0108] Furthermore, the support plate portion 50c-3 can be arranged around the other front end of the resonance rod 40 to prevent twisting of the portion corresponding to the wrinkle portion 50c-1.

[0109] Figure 12 For along Figure 1 The AA wire-cut perspective view shows the tolerance management stop portion of the fourth embodiment of the structure of an antenna cavity filter according to an embodiment of the present invention. Figure 13 for Figure 12 sectional view, Figure 14 for Figure 6 The cut-and-disassembled 3D diagram, Figure 15 For along Figure 1The AA wire-cut perspective view shows the tolerance management stop portion of the fifth embodiment of the structure of an antenna cavity filter according to an embodiment of the present invention. Figure 16 for Figure 15 sectional view, Figure 17 for Figure 15 The cut-out 3D diagram.

[0110] Reference Figures 2 to 11 In an embodiment of the present invention, when the other end of the resonant rod 40 is inserted into the empty interior of the resonant rod boss 30-T formed in a circular tubular shape on the bottom surface of the cavity C of the filter body 10, tolerance management stops 50a, 50b, and 50c are provided individually or as a whole for the resonant design of the cavity C.

[0111] However, the resonant rod boss 30 does not need to be formed in a circular tubular shape. As described later in the fourth and fifth embodiments, the tolerance management stops 50d and 50e can be embodied as cylindrical resonant rod boss 30-P (Pole) protruding from the bottom surface of the cavity C along the aforementioned one-sided direction at a predetermined height. The other end of the resonant rod 40 can be embodied in a form that is joined to the outer peripheral surface of one end of the resonant rod boss 30-P.

[0112] Among them, such as Figures 12 to 14 As shown, all diameters of the resonant rod boss 30-P, which has a cylindrical shape, are the same, or as... Figures 15 to 17 As shown, it can have a cylindrical shape with a diameter that gradually decreases from the bottom surface of cavity C along one side.

[0113] Reference Figures 12 to 14 The tolerance management stop portion 50d of the fourth embodiment is manufactured separately, identical to the tolerance management stop portion 50c of the third embodiment, and is shaped between the inner peripheral surface of the resonance rod 40 and the outer peripheral surface 31-O (Out) of the resonance rod boss 30-P. That is, the tolerance management stop portion 50d of the fourth embodiment can be a friction member disposed between the outer peripheral surface 31-O of the resonance rod boss 30-P and the inner peripheral surface of the resonance rod 40.

[0114] More in detail, such as Figures 12 to 14 As shown, the tolerance management stop portion 50d of the fourth embodiment may have a pleated shape, and the diameter of the inner peripheral surface that contacts the outer peripheral surface 31-O of the resonant rod boss 30-P is large enough to be forcibly fastened into the outer peripheral surface 31-O of the resonant rod boss 30-P.

[0115] Among them, such as Figure 14As shown, the tolerance management stop 50d in the fourth embodiment may also include a wrinkled part 50d-1. When it is provided as a separate friction member, it is located between the inner peripheral surface of the resonance rod 40, and its outer side applies pressure to the inner peripheral surface of the resonance rod 40, while its inner side applies pressure to the outer peripheral surface 31-O of the boss 30-P.

[0116] Furthermore, the tolerance management stop portion 50d in the fourth embodiment, which is provided as a friction component, may also include a support plate portion 50d-3, integrally formed on the other side of the wrinkled portion 50d-1, and provided in such a way that it surrounds one end of the resonance rod boss together with the wrinkled portion 50d-1; and a plurality of cutting portions 50d-2, which separate a portion of the edge end of the support plate portion 50d-3 and the wrinkled portion 50d-1 along the circumferential direction.

[0117] The wrinkled portion 50d-1, via the cutting portion 50d-2 located between the inner circumferential surface of the resonant rod 40 and the outer circumferential surface 31-O of the resonant rod boss 30-P, undergoes elastic deformation when external force is applied by the assembler (or resonant tuning designer), thus facilitating forced engagement. In particular, when the resonant rod boss 30-P, which can be cylindrical, has the same diameter (outer diameter) formed along one side from the bottom surface of the cavity C, and the resonant rod 40 to which it is engaged has the same diameter (inner diameter), the wrinkled portion 50d-1 of the tolerance management stop portion 50d, which serves as a friction component, elastically generates friction between the outer circumferential surface 31-O of the resonant rod boss 30-P and the inner circumferential surface of the resonant rod 40, respectively, using external force applied by the assembler (or resonant tuning designer), making tolerance management easier to implement.

[0118] On the other hand, refer to Figures 15 to 17 In the fifth embodiment, the tolerance management stop 50e can be integrally formed on the inner circumferential surface of the resonance rod 40.

[0119] More specifically, the fifth embodiment provides the advantage that, unlike the fourth embodiment's tolerance management stop 50d, the fifth embodiment makes tolerance management of the resonant rod 40, which is connected to the resonant rod boss 30-P formed in a cylindrical shape whose diameter gradually decreases from the bottom surface of the cavity C along one side, easier.

[0120] That is, such as Figures 15 to 17As shown, in the fifth embodiment, the tolerance management stop 50e can be formed from a rib shape protruding from the inner circumferential surface of the resonance rod 40 towards the center, and a plurality of protruding ribs spaced apart along the circumferential direction are integrally formed on the inner circumferential surface of the resonance rod 40. The plurality of protruding ribs are formed by protruding and recessing inward on the outer circumferential surface portion of the resonance rod 40. When the resonance rod 40 is inserted and coupled in a manner surrounding the outer circumferential surface 31-O of one end of the resonance rod boss 30-P, the plurality of protruding ribs contact and press against the upper and lower lines of the inclined outer circumferential surface 31-O of the resonance rod boss 30-P, facilitating tolerance management of the resonance rod 40.

[0121] As described above, the effects of the embodiments of the cavity filter for antennas of the present invention are briefly explained below.

[0122] First, the cavity filter 1 for antennas according to an embodiment of the present invention has the following advantages: when performing the first tuning design of the resonant frequency in the cavity C, the resonant rod 40 is temporarily fixed to the resonant rod boss 30 by the tolerance management stop parts 50a to 50e, and the tolerance design range is expanded by the resonant rod 40 being movably set on the resonant rod boss 30.

[0123] Furthermore, since the tolerance design range can be expanded by setting the tolerance management stops 50a to 50e, the post-processing of the resonance rod 40, which was previously performed to meet the precise resonant frequency tuning design range, can be completely omitted.

[0124] Moreover, the weight of the resonance rod 40 can be reduced by fully fixing the resonance rod boss 30 through the welding part 60 after the first tuning of the resonance frequency is completed. Therefore, a thinner resonance rod 40 can be manufactured to save on the overall product cost.

[0125] The cavity filter for an antenna according to an embodiment of the present invention has been described in detail above with reference to the accompanying drawings. Of course, the embodiments of the present invention are not limited to the one described above, and various modifications and equivalent implementations can be made by those skilled in the art. Therefore, the actual scope of protection of the present invention should be defined according to the scope of the invention claims.

[0126] Industrial availability

[0127] This invention provides a cavity filter for antennas that allows for expanded tolerances during resonator manufacturing and facilitates frequency tuning design within the cavity.

Claims

1. A cavity filter for antennas, characterized in that, include: The filter body has multiple cavities, one side of which is open and divided by a partition. Resonance rods are respectively disposed in the above-mentioned multiple cavities; A resonant rod boss is provided so that a portion of the resonant rod is inserted therein, thereby placing the resonant rod in the cavity. as well as A tolerance-managing stop is disposed between the inner circumferential surface of the resonant rod boss and the outer circumferential surface of the resonant rod. When the resonance of the cavity is designed, it performs movement and stopping functions along the insertion direction of the resonant rod. The tolerance-managing stop is a friction member disposed between the inner circumferential surface of the resonant rod boss and the outer circumferential surface of the resonant rod. The friction member includes a wrinkled portion between the outer circumferential surface of the resonant rod, the outer side of which applies pressure to the inner circumferential surface of the resonant rod boss, and the inner side of which applies pressure to the outer circumferential surface of the resonant rod. Furthermore, the friction member also includes a plurality of cut portions spaced apart along the circumferential direction on one side of the wrinkled portion.

2. The cavity filter for antennas according to claim 1, characterized in that, The aforementioned resonant rod protrusion protrudes from the bottom surface of the aforementioned cavity along the aforementioned side direction, forming an internally empty circular tube.

3. The cavity filter for antennas according to claim 2, characterized in that, It also includes a welding part. If the above-mentioned resonance rod is temporarily fixed to the design position of the resonance design through the cavity space by the above-mentioned tolerance management stop part, it is coated on the front end of the above-mentioned resonance rod boss and then cured.

4. The cavity filter for antennas according to claim 3, characterized in that, The aforementioned welded parts are concealed from the outside by coating and curing.

5. The cavity filter for antennas according to claim 3, characterized in that, The aforementioned tolerance management stop is integrally formed on the outer peripheral surface of the resonant rod, which is inserted toward the inner peripheral surface of the resonant rod boss.

6. The cavity filter for antennas according to claim 3, characterized in that, The aforementioned tolerance management stop has a pleated shape, and the diameter of the outer peripheral surface that contacts the inner peripheral surface of the aforementioned resonance rod boss has a size that forcibly snaps into the inner peripheral surface of the aforementioned resonance rod boss.

7. The cavity filter for antennas according to claim 1, characterized in that, The aforementioned friction component also includes a support plate portion integrally formed on the other side of the aforementioned wrinkled portion, so as to surround the front end of the aforementioned resonant rod together with the aforementioned wrinkled portion.

8. The cavity filter for antennas according to claim 1, characterized in that, The aforementioned resonant rod boss protrudes from the bottom surface of the aforementioned cavity along the aforementioned one-sided direction to form a cylindrical shape.

9. The cavity filter for antennas according to claim 8, characterized in that, The aforementioned tolerance management stop has a pleated shape, and at least the diameter of the inner peripheral surface that contacts the outer peripheral surface of the aforementioned resonant rod boss has a size that forcibly snaps into the outer peripheral surface of the aforementioned resonant rod boss.

10. The cavity filter for antennas according to claim 8, characterized in that, The aforementioned tolerance management stop is a friction component disposed between the outer peripheral surface of the aforementioned resonance rod boss and the inner peripheral surface of the aforementioned resonance rod.

11. The cavity filter for antennas according to claim 10, characterized in that, The aforementioned friction component includes a wrinkled portion located on the inner circumferential surface of the aforementioned resonance rod, the outer side of which applies pressure to the inner circumferential surface of the aforementioned resonance rod boss, and the inner side of which applies pressure to the outer circumferential surface of the aforementioned resonance rod.

12. The cavity filter for antennas according to claim 11, characterized in that, The aforementioned friction components also include: A support plate portion is integrally formed on the other side of the aforementioned wrinkled portion, and is disposed such that it surrounds one end of the aforementioned resonant rod boss together with the aforementioned wrinkled portion; and Multiple cuts separate a portion of the edge end of the aforementioned support plate portion and the aforementioned wrinkled portion along the circumferential direction.

13. The cavity filter for antennas according to claim 8, characterized in that, The aforementioned resonant rod boss is cylindrical in shape, and its diameter gradually decreases from the bottom surface of the aforementioned cavity along the aforementioned side direction. The aforementioned tolerance management stop is formed in the shape of a rib protruding from the inner circumference of the aforementioned resonance rod towards the center, and a plurality of protruding ribs spaced apart along the circumferential direction are integrally formed on the inner circumferential surface of the aforementioned resonance rod.

14. The cavity filter for antennas according to claim 1, characterized in that, It also includes a filter cover that covers the open side of the aforementioned cavity. The resonant design of the cavity space utilizes an external pressing component inserted through a design hole to repeatedly move and stop the resonant rod, which is equipped with the tolerance-managed stop. The design hole is formed in a design cover that performs the same covering function as the filter cover and has a predetermined design hole.

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