Filter, method of manufacturing the same, and antenna

Abstract

This application provides a filter, its manufacturing method, and an antenna. The filter includes a housing and multiple spaced resonant teeth, all formed by an integral plate, with the resonant teeth located within the housing. The plate comprises n sequentially connected sub-plates, forming the filter housing; n is an integer greater than or equal to 3. Furthermore, the plate includes multiple resonant teeth, at least one of which is connected to the nth sub-plate, and each resonant tooth has a free end. This filter features a simple assembly process, high connection reliability, and fewer intermodulation points requiring adjustment after assembly.

Description

Technical Field

[0001] This application relates to the field of filters, specifically to a filter, its manufacturing method, and an antenna. Background Technology

[0002] In wireless communication systems, filters effectively allow useful signals to pass through while blocking unwanted signals. As antenna integration increases, the demands for miniaturization and weight reduction in filters also rise. Furthermore, as structural components, filters in existing devices often require pluggable installation methods to flexibly integrate into antennas, cables, or connectors for ease of assembly, disassembly, and maintenance.

[0003] Currently, existing filters mainly consist of a separate housing and resonant teeth. The resonant teeth and housing are manufactured separately before assembly. The resonant teeth typically require an additional support structure within the housing, and the grounding point needs to be connected to the housing via welding or screw fastening. Therefore, existing filters involve numerous assembly steps. Furthermore, because many parts are needed to connect the housing and resonant teeth during assembly, adjustments are required at each connection point after assembly to ensure the filter's accuracy meets manufacturing requirements. Consequently, existing filters suffer from complex assembly processes and reduced radiation performance due to numerous intermodulation points. Summary of the Invention

[0004] This application provides a filter, its manufacturing method, and an antenna to simplify the filter assembly process, improve connection reliability, and reduce filter intermodulation points.

[0005] In a first aspect, this application provides a filter, which includes a housing and a plurality of spaced-apart resonant teeth. The housing and the plurality of resonant teeth are formed by an integral plate, and the plurality of resonant teeth are located within the housing. The plate includes n sequentially connected sub-plates, which are arranged in a direction that defines a first sub-plate, a second sub-plate, ..., and an nth sub-plate. The first sub-plate and the nth sub-plate are closedly connected, and the n sub-plates enclose the housing of the filter; n is an integer greater than or equal to 3. Furthermore, the plate also includes a plurality of resonant teeth, at least one of which is connected to the nth sub-plate, and each resonant tooth has a free end.

[0006] The filter provided in this application, because its housing and resonant teeth are formed from an integrated plate, wherein n sub-plates are integrally bent and connected to form the housing, and the resonant teeth are located within the cavity formed by the housing and integrally connected to the nth sub-plate, eliminates the need for additional components to fix the housing and resonant teeth, significantly reducing the number of components and simplifying the assembly process. Furthermore, by significantly reducing the number of components, the number of contact points can be effectively reduced, thereby reducing intermodulation points and avoiding the need for intermodulation analysis due to excessive components. In addition, the integrated structure also helps to reduce the weight of the filter.

[0007] In one possible implementation of this application, n is 5, wherein in the filter housing, the first sub-board and the fifth sub-board are closedly connected and positioned opposite the third sub-board, and the second sub-board and the fourth sub-board are positioned opposite each other. Thus, a tetrahedral housing structure can be formed.

[0008] In one possible implementation of this application, the total area of ​​the first sub-plate and the fifth sub-plate is the same as the area of ​​the third sub-plate. In another possible implementation of this application, the area of ​​the second sub-plate is the same as the area of ​​the fourth sub-plate. Thus, the shell composed of the first sub-plate, the second sub-plate, the third sub-plate, the fourth sub-plate, and the fifth sub-plate is a cuboid structure with openings at both ends.

[0009] In one possible implementation of this application, the second or fourth sub-board is provided with a tuning section, which is correspondingly disposed with the free end of the resonant tooth. In another possible implementation, the second or fourth sub-board has an opening, and the tuning section is disposed within the opening. Specifically, in the configuration of the tuning section, one end of the tuning section is connected to the second or fourth sub-board, and the free end of the tuning section can move in a direction close to or away from the free end of the resonant tooth.

[0010] Secondly, this application provides a method for manufacturing a filter, the method comprising the following steps: bending an integral plate to form the filter, wherein,

[0011] Along the first direction of the plate, the plate includes a first sub-plate, a second sub-plate, ..., an nth sub-plate and a plurality of resonant teeth connected in sequence. A bending line is provided between any two adjacent sub-plates among the first sub-plate, the second sub-plate, ..., the nth sub-plate, where n is an integer greater than or equal to 3. A bending line is provided between the nth sub-plate and the plurality of resonant teeth, and at least one of the plurality of resonant teeth is connected to the nth sub-plate.

[0012] The first sub-plate, the second sub-plate, ... and the nth sub-plate are bent along the bending lines. The first sub-plate and the nth sub-plate are closed and connected. The first sub-plate, the second sub-plate, ... and the nth sub-plate form a cavity to form the housing of the filter. The multiple resonant teeth are bent into the housing along the bending lines between the nth sub-plate and the multiple resonant teeth. The resonant teeth are provided with free ends.

[0013] The manufacturing method provided in this application employs an integrated plate structure. Since the plate has multiple pre-set bending lines and n sub-plates and resonant teeth separated by these bending lines, a filter can be assembled by bending the n sub-plates along the bending lines. In the assembled filter, the first sub-plate, the second sub-plate, ..., and the nth sub-plate form the filter housing. The first sub-plate and the nth sub-plate are mated together, and the multiple resonant teeth are bent into the cavity formed by the housing. In this manufacturing method, because the housing and resonant teeth are integrated and formed by bending, the number of parts can be significantly reduced, simplifying the assembly process. The filter formed using this method has an integrated connection between the housing and the resonant teeth. After significantly reducing the number of components in the filter, the contact points of the components can be effectively reduced to lower intermodulation points, avoiding the intermodulation analysis process caused by too many parts. Furthermore, the integrated structure also helps to reduce the weight of the filter.

[0014] In one possible implementation of this application, the method for manufacturing the filter further includes a step of forming a plate using a stamping process. The stamping process can form bending lines and resonant teeth, facilitating processing.

[0015] In one possible implementation of this application, forming the plate using a stamping process includes: processing n spaced bending lines on the surface of an integral metal plate using a stamping process to form a first sub-plate, a second sub-plate, ..., an nth sub-plate, and a sub-plate for processing resonant teeth. In another possible implementation of this application, forming the plate using a stamping process further includes: processing multiple resonant teeth in the region of the metal plate corresponding to the sub-plate for processing resonant teeth using a stamping process. The processing of the bending lines and the processing of the resonant teeth can be performed in two steps or in one step.

[0016] In one possible implementation of this application, n is 5. When the metal plate is divided into six sub-plates using bending creases, in the shell formed after bending, the first sub-plate and the fifth sub-plate are closed and connected, and are positioned opposite the third sub-plate; the second sub-plate and the fourth sub-plate are positioned opposite each other. In this structure, the formed shell includes four sidewalls: the first and fifth sub-plates are closed and connected to form one sidewall, and the second, third, and fourth sub-plates form the remaining three sidewalls, respectively.

[0017] In one possible implementation of this application, the total area of ​​the first sub-plate and the fifth sub-plate is the same as the area of ​​the third sub-plate. In another possible implementation of this application, the area of ​​the second sub-plate is the same as the area of ​​the fourth sub-plate. Thus, the shell composed of the first sub-plate, the second sub-plate, the third sub-plate, the fourth sub-plate, and the fifth sub-plate is a cuboid structure with openings at both ends.

[0018] Thirdly, this application also provides a filter, which is fabricated using the method described in the second aspect of this application. The filter in this application can be a bandpass filter or a bandstop filter.

[0019] Fourthly, this application also provides an antenna that includes the filter of the first aspect of this application or the filter of the third aspect of this application.

[0020] The antenna can be, for example, a base station antenna, used to receive or transmit signals.

[0021] The technical effects that can be achieved in the third and fourth aspects mentioned above can be referred to the corresponding effect descriptions in the first and second aspects mentioned above, and will not be repeated here. Attached Figure Description

[0022] Figure 1 This is a block diagram of the internal structure of a base station antenna according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of a filter according to an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the structure of an integrated plate-like structure according to an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of a filter fabrication method according to an embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the structure of a metal plate according to an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the structure of another integrated plate-like structure according to an embodiment of this application;

[0028] Figure 7 This is a schematic diagram of another filter structure according to an embodiment of this application;

[0029] Figure 8 This is a schematic diagram of the structure at the joint between the first sub-board and the fifth sub-board according to an embodiment of this application;

[0030] Figure 9 This is a schematic diagram of the joint between the first sub-board and the fifth sub-board in another embodiment of this application.

[0031] Reference numerals: 10-Metal plate; 20-Plate body; 21-First sub-board; 22-Second sub-board; 23-Third sub-board; 24-Fourth sub-board; 25-Fifth sub-board; 26-Sixth sub-board; 261-Resonant tooth; 262-Connecting conductor; 263-Signal input terminal; 264-Signal output terminal; 27-Tuning section; 28-Fastener; 30-Filter; 31-Housing; 40-Base station antenna; 41-Radiating element; 42-Feed network; 421-Phase shifter; 422-Combiner; 423-Transmission component; 424-Calibration network. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0033] To understand this application, a brief introduction to the application scenarios of the filter in this application will be given first. The following explanation uses a base station antenna feeder system as an example. A base station antenna feeder system typically includes components such as a base station antenna, feeder cable, mast, and antenna adjustment bracket. Figure 1 This is a block diagram of the internal structure of a base station antenna in one embodiment of this application, as shown below. Figure 1 As shown, in one embodiment of this application, the base station antenna 40 typically contains a radiating element 41 and a feed network 42. The radiating element 41 receives or transmits radio frequency signals through the feed network 42. The feed network 42 can achieve different radiation beam directions through the transmission component 423, or obtain the required calibration signal through the calibration network 424. In addition, the feed network 42 may also include components such as a phase shifter 421, a combiner, and a filter 30 to extend the performance of the feed network 42. It is understood that the above-described base station antenna is only an example of one application scenario of the filter, and filters can also be applied in other devices such as uninterruptible power supplies and switching power supplies.

[0034] Currently, the commonly used filter types in base station antennas 40 mainly include metal coaxial cavity filters and suspended stripline filters. Metal coaxial cavity filters have a three-dimensional shape, thus occupying a large space, which is not conducive to the use of miniaturized devices. Suspended stripline filters mainly consist of resonant teeth formed by metal conductors and a housing. The resonant teeth and housing are processed separately and then assembled. During installation, the resonant teeth usually require an additional support structure placed inside the housing, and the grounding point needs to be connected to the housing by welding or screw fastening. Therefore, this suspended stripline filter has many assembly steps and intermodulation points, resulting in a complex assembly process and requiring intermodulation analysis of multiple intermodulation points.

[0035] To address the aforementioned technical problems, this application provides a filter, a method for manufacturing the same, and an antenna. The terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0036] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0037] Example 1

[0038] Figure 2 This is a schematic diagram of the structure of a filter according to one embodiment of this application, as shown below. Figure 2 As shown, in one embodiment of this application, the filter 30 includes a housing 31 and a resonant tooth 261, which are formed by bending an integral plate. Figure 3 This is a schematic diagram of the structure of the plate 20 of an integrated plate structure according to an embodiment of this application, as shown below. Figure 3 As shown, the board 20 includes n sequentially connected sub-boards. Along the arrangement direction of the n sub-boards, the n sub-boards can be sequentially designated as the first sub-board, the second sub-board, ..., and the nth sub-board, where n can be an integer greater than or equal to 3. For example... Figure 2 and Figure 3 As shown, n sequentially connected sub-plates can be bent and joined together to form a shell 31. The main structure of the shell 31 is a hollow column structure with open ends, wherein the first sub-plate and the nth sub-plate are closedly connected. The connection between the first sub-plate and the nth sub-plate can be fixed by welding, riveting, bonding, or by using locking components such as screws and bolts.

[0039] Continue to refer to Figure 2 and Figure 3In one embodiment of this application, n can be 5. The five sub-plates are sequentially designated as first sub-plate 21, second sub-plate 22, third sub-plate 23, fourth sub-plate 24, and fifth sub-plate 25 according to their arrangement direction. In the housing 31, the first sub-plate 21 and the fifth sub-plate 25 are closedly connected, forming one sidewall of the housing 31. The second sub-plate 22, the third sub-plate 23, and the fourth sub-plate 24 form the other three sidewalls of the housing 31, respectively. The first sub-plate 21 is positioned opposite the third sub-plate 23 after being closedly connected with the fifth sub-plate 25, and the second sub-plate 22 is positioned opposite the fourth sub-plate 24. Thus, the housing 31 formed by the five sub-plates has a tetrahedral shape.

[0040] Continue to refer to Figure 2 and Figure 3 In one embodiment of this application, along the circumference of the shell 31, that is, along the sidewall of the shell, from the first sub-plate through the second sub-plate, the third sub-plate, and the fourth sub-plate in sequence to the fifth sub-plate, the shape and area of ​​the sidewall formed by the first sub-plate 21 and the fifth sub-plate 25 are the same as the shape and area of ​​the sidewall formed by the third sub-plate 23, and the shape and area of ​​the sidewall formed by the second sub-plate 22 are the same as the shape and area of ​​the sidewall formed by the fourth sub-plate 24. In this way, the first sub-plate 21, the second sub-plate 22, the third sub-plate 23, the fourth sub-plate 24, and the fifth sub-plate 25 can form a cuboid shell 31 with openings at both ends.

[0041] It is understood that the shape of the shell formed by the five sub-plates described above is merely illustrative. Besides the tetrahedral structure, the shell can also be formed in other shapes depending on the number of sub-plates used. For example, when n is three, the shell can be a trihedral structure. When n is four, a trihedral or tetrahedral structure can be formed. Specifically, when the first and fourth sub-plates are joined together to form one sidewall of the shell, the four sub-plates can form a trihedral shell; and when the first and fourth sub-plates are joined together to form two sidewalls of the shell, the four sub-plates can form a tetrahedral shell. Similarly, when n is six, a pentahedral or hexahedral shell can be formed. Here, the embodiments of this application do not limit the specific shape of the shell; it can be designed according to specific application scenarios.

[0042] Continue to refer to Figure 2 and Figure 3In one embodiment of this application, the plate 20 further includes a plurality of resonant teeth 261. The plurality of resonant teeth 261 are disposed on a side near the nth sub-plate, and at least one of the plurality of resonant teeth 261 is connected to the nth sub-plate, for example, to the fifth sub-plate. The resonant teeth 261 are located within the cavity formed by the housing 31. The number of resonant teeth 261 can be multiple, for example, 3, 4, 5, 6, 7, or more. This embodiment of the application does not specifically limit the number of resonant teeth 261. The plurality of resonant teeth 261 can be arranged in a comb-like structure. One end of any resonant tooth 261 can be integrally connected to the fifth sub-plate 25, and the other end is a free end. In the filter 30 structure of this embodiment, the extending direction of the resonant teeth 261 can be parallel to the second sub-plate 22 and the fourth sub-plate 24, and perpendicular to the third sub-plate 23.

[0043] Reference Figure 3 As shown, in one embodiment of this application, a connecting conductor 262 may be provided between any two adjacent resonant teeth 261, which can serve as a signal transmission wire between the resonant teeth 261. The outermost resonant tooth 261 may also be provided with a signal input terminal 263 and a signal output terminal 264 to facilitate connection to external lines. The filter 30 of this structure can serve as a bandpass filter.

[0044] Refer to together Figure 2 and Figure 3In one embodiment of this application, the fourth sub-board 24 may be provided with a tuning section 27. In the filter 30, the tuning section 27 is correspondingly provided with the free end of the resonant tooth 261. The corresponding provision of the tuning section 27 with the free end of the resonant tooth 261 can be understood as the two being positioned opposite each other in the vibration direction of the free end of the resonant tooth 261. By providing the tuning section 27, the frequency of the transmitted signal of the filter 30 can be finely adjusted, making the filtering effect of the filter 30 more precise. In one embodiment of this application, when providing the tuning section 27, one end of the tuning section 27 can be connected to the fourth sub-board 24. The free end of the tuning section 27 can move towards or away from the free end of the resonant tooth 261 under the action of an external force, while remaining fixed when no external force is applied. Specifically, in one embodiment of this application, when the tuning part 27 is provided, the fourth sub-plate 24 has an opening, and the tuning part 27 is disposed in the opening. One end of the tuning part 27 is connected to the fourth sub-plate 24, and the other end is a free end. In this way, the free end of the tuning part 27 can change position under the action of external force. When the free end of the tuning part 27 is subjected to a force toward the cavity, the free end of the tuning part 27 can move to a position closer to the free end of the resonant tooth 261; when the free end of the tuning part 27 is subjected to a force toward the cavity, the free end of the tuning part 27 can move to a position further away from the free end of the resonant tooth 261. It is understood that this application does not specifically limit the shape of the tuning part 27. For example, its shape can be rectangular or elliptical, or a combination of rectangle and semicircle, etc. It is understood that the tuning part 27 can be disposed not only on the fourth sub-plate 24, but also on the second sub-plate 22, and can also produce the same tuning effect.

[0045] The method for manufacturing the filter according to the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0046] Figure 4 This is a schematic diagram of a filter fabrication method according to an embodiment of this application, as shown below. Figure 4 As shown, a method for manufacturing a filter 30 according to an embodiment of this application includes the following steps:

[0047] Step S101: Provide an integrated plate-like structure, wherein the structure of the integrated plate-like structure can be referred to Figure 3 As shown.

[0048] like Figure 3 As shown, in one embodiment of this application, along the first direction of the plate 20, such as Figure 3In the X direction, the plate 20 includes a first sub-plate 21, a second sub-plate 22, a third sub-plate 23, a fourth sub-plate 24, a fifth sub-plate 25 arranged sequentially, and multiple resonant teeth 261. A bending crease is provided between any two adjacent sub-plates of the first sub-plate 21, second sub-plate 22, third sub-plate 23, fourth sub-plate 24, and fifth sub-plate 25. A bending crease is also provided between the fifth sub-plate and the multiple resonant teeth. (Continue referring to...) Figure 3 In one embodiment of this application, each resonant tooth 261 is directly connected to the fifth sub-board 25 and extends from the fifth sub-board 25 in a direction away from the fifth sub-board 25. The end of each resonant tooth 261 away from the fifth sub-board 25 is a free end. The number of resonant teeth 261 can be greater than or equal to three, for example, four, five, six, seven, eight, or more. The specific number of resonant teeth 261 is set according to the transmission signal required by the filter 30. A comb-like structure can be formed between the multiple resonant teeth 261.

[0049] Step S102: Bend the first sub-plate 21, the second sub-plate 22, the third sub-plate 23, the fourth sub-plate 24, and the fifth sub-plate 25 along the bending lines. After bending, the first sub-plate 21 and the fifth sub-plate 25 are closed and connected, so that the first sub-plate 21, the second sub-plate 22, the third sub-plate 23, the fourth sub-plate 24, and the fifth sub-plate 25 form the housing 31 of the filter 30. During bending, multiple resonant teeth 261 are folded into the cavity formed by the housing 31. The structure of the filter 30 formed after bending is as follows: Figure 2 As shown. Figure 2 As shown, in one embodiment of this application, after bending, the first sub-plate 21, the second sub-plate 22, the third sub-plate 23, the fourth sub-plate 24 and the fifth sub-plate 25 form a tetrahedral shell 31. The first sub-plate 21 and the fifth sub-plate 25 are closed and connected to form one side wall of the shell 31. The second sub-plate 22, the third sub-plate 23 and the fourth sub-plate 24 respectively form the other three side walls of the shell 31. A plurality of resonant teeth 261 are located in the cavity formed by the shell 31, and the free ends of the resonant teeth 261 are separated from the shell 31.

[0050] It is understandable that when the plate 20 contains n sub-plates, the first sub-plate 21 to the nth sub-plate are used to form the shell 31, the resonant tooth 261 is connected to the nth sub-plate, and when bent, the first sub-plate 21 and the nth sub-plate are connected, and multiple resonant teeth 261 are folded into the cavity of the shell 31 from the part where the first sub-plate 21 and the nth sub-plate are connected.

[0051] In one embodiment of this application, the method for manufacturing the filter may further include the step of forming a plate using a stamping process. In one embodiment of this application, forming the plate using a stamping process includes: providing a metal plate with an integral structure. Figure 5 This is a schematic diagram of the structure of a metal plate 10 according to an embodiment of this application, combined with... Figure 3 and Figure 5 A stamping process is used to process n spaced bending lines on the surface of the metal plate 10 to form a first sub-plate 21, a second sub-plate 22, ..., an nth sub-plate, and an (n+1)th sub-plate for processing resonant teeth. When n is 5, a stamping process can be used to form 5 bending lines on the surface of the metal plate 10 to divide the metal plate 10 into a first sub-plate 21, a second sub-plate 22, a third sub-plate 23, a fourth sub-plate 24, a fifth sub-plate 25, and a sixth sub-plate 26. The metal plate 10 can be, for example, a copper plate, with a thickness of, for example, 0.5-2 mm. The material and thickness of the metal plate 10 can be set according to the specific application scenario and size of the filter 30, and are not specifically limited here.

[0052] In one embodiment of this application, combined with Figure 3 and Figure 5 The process of forming the plate using stamping also includes: forming resonant teeth 261 in the region of the metal plate 10 corresponding to the (n+1)th sub-plate using stamping. When n is 5, resonant teeth 261 can be formed in the region corresponding to the sixth sub-plate 26 using stamping. The bending lines and resonant teeth 261 can be formed simultaneously in a single stamping process or separately using a step-by-step stamping process; this embodiment does not specifically limit this. Additionally, while processing the resonant teeth 261, connecting conductors 262 can also be formed simultaneously using stamping. Furthermore, a tuning section 27 can be formed in the second sub-plate 22 or the fourth sub-plate 24 using stamping.

[0053] Example 2

[0054] Figure 6 This is a schematic diagram of the filter structure according to another embodiment of this application. Figure 7 This is a schematic diagram of the integrated structure of the plate 20 according to another embodiment of this application. Figure 6 and Figure 7 As shown, the difference between this embodiment and the filter 30 in Embodiment 1 above lies in the structure of the resonant tooth 261. For example... Figure 6 and Figure 7 As shown, in one embodiment of this application, the resonant teeth 261 are L-shaped, and multiple resonant teeth 261 are spaced apart. The multiple resonant teeth 261 are connected by connecting conductors 262, and signals are transmitted through the connecting conductors 262. In this embodiment, the connecting conductor 262 can be a long strip-shaped conductor, and it can be located on the side away from the fifth sub-board 25. One end of the connecting conductor 262 can serve as a signal input terminal 263, and the other end can serve as a signal output terminal 264.

[0055] Continue to refer to Figure 7Of the multiple resonant teeth 261, one end of a portion of the resonant teeth 261 can be connected to the fifth sub-board 25, while the other end is a free end. When this portion of the resonant teeth 261 is connected to the connecting conductor 262, the connecting conductor 262 can be electrically connected to the middle portion of this portion of the resonant teeth 261. One end of the remaining resonant teeth 261 can be connected to the connecting conductor 262, while the other end is a free end.

[0056] Refer to together Figure 6 and Figure 7 In one embodiment of this application, the number of resonant teeth 261 may be three. Two of the resonant teeth 261 have one end connected to the fifth sub-board 25 and the other end free. The middle part of any one of the resonant teeth 261 is connected to the connecting conductor 262. The other resonant tooth 261 has one end connected to the connecting conductor 262 and the other end free.

[0057] The method for fabricating the filter in this embodiment can be referred to the method for fabricating the filter in Embodiment 1. Figure 7 The plate shown is bent to form a filter. See also... Figure 6 and Figure 7 ,use Figure 7 The filter 30 formed by the plate 20 shown can also have its housing 31 formed by the first sub-plate 21, the second sub-plate 22, the third sub-plate 23, the fourth sub-plate 24, and the fifth sub-plate 25. This housing 31 is also a tetrahedral structure. The first sub-plate 21 and the fifth sub-plate 25 are joined together to form one sidewall of the housing 31. The second sub-plate 22, the third sub-plate 23, and the fourth sub-plate 24 form the other three sidewalls of the housing 31. The first sub-plate 21 and the fifth sub-plate 25 are closed together and positioned opposite the third sub-plate 23. The second sub-plate 22 and the fourth sub-plate 24 are positioned opposite each other. The resonant tooth 261 and the connecting conductor 262 are located within the cavity formed by the housing 31. This filter 30 can be used as a band-stop filter 30.

[0058] Continue to refer to Figure 7 In one embodiment of this application, in a first direction, i.e., the X direction shown in the figure, the width dimensions of the first sub-plate 21 and the fifth sub-plate 25 are the same as the width dimension of the third sub-plate 23, so that the area formed after the first sub-plate 21 and the fifth sub-plate 25 are connected is the same as the area of ​​the third sub-plate; and in this first direction, the width dimension of the second sub-plate 22 is the same as the width dimension of the fourth sub-plate 24, but the area of ​​the second sub-plate 22 is the same as the area of ​​the fourth sub-plate 24. Therefore, after the shell 31 is formed, the sidewalls formed by the first sub-plate 21 and the fifth sub-plate 25 are parallel to the sidewalls formed by the third sub-plate 23, and the sidewalls formed by the second sub-plate 22 are parallel to the sidewalls formed by the fourth sub-plate 24, which facilitates the formation of mutually perpendicular tetrahedral structures.

[0059] Figure 8 This is a schematic diagram of the joint between the first sub-board 21 and the fifth sub-board 25 according to an embodiment of this application, and is also referred to Figure 7 and Figure 8 In one embodiment of this application, when the first sub-plate 21 and the fifth sub-plate 25 have the same shape and area, the first sub-plate 21 and the fifth sub-plate 25 can each be half the area of ​​the third sub-plate 23, thereby allowing the resonant tooth 261 to be located on the bisector of the cavity. When the first sub-plate 21 and the fifth sub-plate 25 are joined, they can be joined by welding or by bonding. Figure 9 This is a schematic diagram of the structure at the joint between the first sub-plate 21 and the fifth sub-plate 25 in another embodiment of this application, as shown below. Figure 9 As shown, the area of ​​the first sub-plate 21 can be larger than that of the fifth sub-plate 25. Therefore, when they are joined, there can be an overlapping area, facilitating the fixing of the first sub-plate 21 and the fifth sub-plate 25 with the locking element 28. After the fixed connection, the sidewall area of ​​the shell formed by the first sub-plate 21 and the fifth sub-plate 25 is the same as the area of ​​the third sub-plate. The locking element 28 can be, for example, a rivet or a screw. Figure 8 and Figure 9 The docking method shown is only an example for illustration. Other methods for fixing the first sub-board 21 and the fifth sub-board 25 are all within the scope of the embodiments of this application.

[0060] The filter provided in this application embodiment can be manufactured using an integrated stamping and bending process, reducing assembly steps for different components and lowering manufacturing costs. Furthermore, the integrated filter reduces contact between different components, thereby reducing intermodulation points and intermodulation processes, simplifying the assembly process. Additionally, the filter manufacturing method in this application embodiment can use a thin metal plate, resulting in a thinner overall thickness and reducing the overall weight of the filter. During the manufacturing process, different resonant teeth and connecting conductors with different structures can be obtained through stamping, thus producing bandpass and bandstop filters.

[0061] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A filter, characterized in that, The device includes a housing and a plurality of spaced-apart resonant teeth, wherein the housing and the plurality of resonant teeth are formed from an integral plate, and the plurality of resonant teeth are located within the housing; wherein, The plate body includes n sub-plates connected in sequence. In the arrangement direction of the n sub-plates, they are sequentially divided into a first sub-plate, a second sub-plate, ..., and an nth sub-plate. The first sub-plate and the nth sub-plate are closedly connected, and the n sub-plates surround to form the shell; n is an integer greater than or equal to 3. The plate also includes the plurality of resonant teeth, at least one of which is connected to the nth sub-plate, and the resonant teeth are provided with free ends; A connecting conductor is also provided between adjacent resonant teeth, and the connecting conductor is located inside the housing; The resonant tooth is a planar, sheet-like structure, with the plate surface of the resonant tooth parallel to its extension direction; the extension direction of the resonant tooth is perpendicular to the closed connection surface of the first sub-plate and the nth sub-plate.

2. The filter according to claim 1, characterized in that, The value of n is 5. In the housing, the first sub-plate and the fifth sub-plate are closedly connected and are arranged opposite to the third sub-plate, and the second sub-plate and the fourth sub-plate are arranged opposite to each other.

3. The filter according to claim 2, characterized in that, The total area of ​​the first sub-board and the fifth sub-board is the same as the area of ​​the third sub-board.

4. The filter according to claim 3, characterized in that, The area of ​​the second sub-board is the same as the area of ​​the fourth sub-board.

5. The filter according to any one of claims 2-4, characterized in that, The second sub-board or the fourth sub-board is provided with a tuning section, which is arranged corresponding to the free end of the resonant tooth.

6. The filter according to claim 5, characterized in that, One end of the tuning section is connected to the second sub-board or the fourth sub-board, and the free end of the tuning section can move in a direction close to or away from the free end of the resonant tooth.

7. A method for manufacturing a filter, characterized in that, include: The filter is formed by bending an integrated plate, wherein... Along a first direction of the plate body, the plate body includes a first sub-plate, a second sub-plate, ..., an nth sub-plate and a plurality of resonant teeth connected in sequence. A bending line is provided between any two adjacent sub-plates of the first sub-plate, the second sub-plate, ..., the nth sub-plate, where n is an integer greater than or equal to 3. A bending line is provided between the nth sub-plate and the plurality of resonant teeth, and at least one of the plurality of resonant teeth is connected to the nth sub-plate. A connecting conductor is also provided between adjacent resonant teeth, and the resonant teeth are elongated plate structures. The first sub-board, the second sub-board, ..., and the nth sub-board are bent along the bending lines, and the first sub-board and the nth sub-board are closedly connected. The first sub-board, the second sub-board, ..., and the nth sub-board form the housing of the filter. The plurality of resonant teeth are folded into the housing along the bending lines, and the resonant teeth are provided with free ends. The connecting conductor is located inside the housing. The extension direction of the resonant teeth is perpendicular to the closed connection surface of the first sub-board and the nth sub-board.

8. The manufacturing method according to claim 7, characterized in that, The manufacturing method further includes the step of forming the plate using a stamping process.

9. The manufacturing method according to claim 8, characterized in that, The process of forming the plate using a stamping process includes: processing n spaced bending lines on the surface of an integral metal plate using a stamping process to form the first sub-plate, the second sub-plate, ..., the nth sub-plate and the sub-plate for processing resonant teeth; and processing the multiple resonant teeth on the sub-plate for processing resonant teeth using a stamping process.

10. The manufacturing method according to any one of claims 7-9, characterized in that, The value of n is 5. In the shell formed after bending, the first sub-plate and the fifth sub-plate are closed and connected and are positioned opposite to the third sub-plate, and the second sub-plate and the fourth sub-plate are positioned opposite to each other.

11. The manufacturing method according to claim 10, characterized in that, The total area of ​​the first sub-board and the fifth sub-board is the same as the area of ​​the third sub-board.

12. The manufacturing method according to claim 11, characterized in that, The area of ​​the second sub-board is the same as the area of ​​the fourth sub-board.

13. A filter, characterized in that, It is prepared using the manufacturing method described in any one of claims 7-12.

14. An antenna, characterized in that, Includes the filter according to any one of claims 1-6 or the filter according to claim 13.

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