Filter and communication device

Abstract

The utility model relates to the technical field of communication, and provides a filter and a communication device.The filter comprises a cavity, a resonance rod and a fastener, a positioning column is arranged on the inner side of the bottom wall of the cavity, and the positioning column is provided with a fixing hole; positioning ribs are arranged on the inner wall surface of the resonance rod, the positioning column is inserted into a space defined by the positioning ribs, and the end surface of one end, far away from the bottom wall of the cavity, of the positioning column is lower than the side surface, back to the bottom wall of the cavity, of the positioning ribs; the fastener comprises a rod part and a head part, the rod part is fixedly connected in the fixing hole, and the head part abuts against the side face, back on to the cavity, of the bottom wall of the positioning rib. The positioning column is inserted into the space defined by the positioning ribs, and the head part of the fastener is propped against the side surface of the bottom wall, back to the cavity, of the positioning rib, so that the end surface of one end, far away from the bottom wall of the cavity, of the positioning column is lower than the side surface of the bottom wall, back to the cavity, of the positioning rib; the distance between the head of the fastener and the positioning column can be reduced as much as possible, so that the height of the fastener is further reduced, and a wider frequency design range is provided for a single cavity.

Description

Technical Field

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

[0002] like Figure 1 As shown, the filter 20 includes a cavity 21, a resonant rod 22, and a fastening screw 23. The inner side of the bottom wall of the cavity 21 is provided with a positioning post 211, and the resonant rod 22 has a positioning cavity 222. The resonant rod 22 is positioned and fitted with the positioning post 211 through the positioning cavity 222 and is installed on the inner side of the bottom wall of the cavity 21. The positioning post 211 has a threaded hole 2111, and the resonant rod 22 has a ring rib 221 inside. The fastening screw 23 is screwed into the threaded hole 2111, and the head 231 of the fastening screw 23 is pressed against the ring rib 221 to fasten the resonant rod 22 to the bottom wall of the cavity 21.

[0003] In the filter design, the single-cavity frequency is adjusted by regulating the distance between the end face of the resonant rod near the cover plate and the inner wall surface of the cover plate. The end face of the resonant rod near the cover plate must not be lower than the head of the fastener (e.g., a fastening screw). Because the positioning post must ensure the insertion depth of the fastener, its height cannot be reduced. This prevents the fastener height from being further reduced, affecting the single-cavity frequency. Utility Model Content

[0004] In view of this, embodiments of this application provide a filter and a communication device to solve the problem that the height of the fastener cannot be further reduced, thus affecting the single-cavity frequency.

[0005] The first aspect of this application discloses a filter, including a cavity, a resonant rod, and a fastener. A positioning post is provided on the inner side of the bottom wall of the cavity, and the positioning post has a fixing hole. A positioning rib is provided on the inner wall surface of the resonant rod. The positioning post is inserted into the space enclosed by the positioning rib, and the end face of the positioning post away from the bottom wall of the cavity is lower than the side of the positioning rib facing away from the bottom wall of the cavity. The fastener includes a rod portion and a head provided on the rod portion. The rod portion is fixedly connected in the fixing hole, and the head abuts against the side of the positioning rib facing away from the bottom wall of the cavity.

[0006] The beneficial effects of the filter provided in this application embodiment are as follows: Since the positioning post is inserted into the space enclosed by the positioning rib, and the head of the fastener abuts against the side of the positioning rib facing away from the bottom wall of the cavity, while ensuring that the end face of the positioning post away from the bottom wall of the cavity is lower than the side of the positioning rib facing away from the bottom wall of the cavity, the distance between the head of the fastener and the positioning post can be reduced as much as possible. This is equivalent to reducing the size of the positioning rib in the cavity depth direction, so as to further reduce the height of the fastener, thereby giving a wider frequency design range for a single cavity.

[0007] The end face of the positioning column away from the bottom wall of the cavity is lower than the side face of the positioning rib away from the bottom wall of the cavity, so that the head of the fastener is prevented from contacting the positioning column when the fastener fastens the resonant rod to the bottom wall of the cavity, thereby ensuring that the head of the fastener presses the resonant rod against the bottom wall of the cavity.

[0008] In some embodiments, the hole wall of the fixing hole is provided with an internal thread, and the outer circumferential surface of the rod portion is provided with an external thread.

[0009] In some embodiments, the fastener is a fastening screw or a fastening bolt.

[0010] In some embodiments, the positioning rib is an annular rib, and the space surrounded by the positioning rib is a positioning hole.

[0011] In some embodiments, the positioning hole is a circular hole, and the positioning column is a circular column; or the positioning hole is a polygonal hole, and the positioning column is a prism.

[0012] In some embodiments, the resonant rod comprises a first rod segment and a second rod segment, the first rod segment is located on the side of the positioning rib away from the bottom wall of the cavity, and the second rod segment is located on the side of the positioning rib toward the bottom wall of the cavity, and the wall thickness of the second rod segment is less than or equal to the wall thickness of the first rod segment.

[0013] In some embodiments, the positioning column has a first guide slope for guiding the positioning column into the space surrounded by the positioning rib; and / or the positioning rib has a second guide slope for guiding the positioning column into the space surrounded by the positioning rib.

[0014] In some embodiments, the positioning column is integrally formed with the bottom wall of the cavity.

[0015] In some embodiments, the resonant rod is a cold heading rod.

[0016] The second aspect of the present application provides a communication device comprising the filter according to the first aspect.

[0017] The communication device adopts any one or more of the above-mentioned embodiments of the filter, and thus has the beneficial effects of the above-mentioned embodiments, which will not be repeated here.

[0018] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the conventional description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on these drawings.

[0020] Figure 1 is a sectional view of a filter in the prior art;

[0021] Figure 2 is a sectional view of a filter provided by some embodiments of the present application;

[0022] Figure 3 is Figure 2 is an enlarged view of the filter at A shown in

[0023] Figure 4 is Figure 2 is a sectional view of the cavity in

[0024] Figure 5 is Figure 2 is a sectional view of the resonant rod in

[0025] Figure 6 is Figure 2 is a structural schematic view of the fastener in

[0026] The meanings of the labels in the drawings are as follows:

[0027] 10, filter;

[0028] 11, cavity; 111, positioning column; 1111, fixing hole; 1112, first guide slope;

[0029] 12, resonant rod; 121, first rod segment; 122, intermediate rod segment; 1221, positioning rib; 1222, positioning hole; 1223, second guide slope; 123, second rod segment;

[0030] 13, fastener; 131, rod portion; 132, head portion; 1321, keyway;

[0031] 14, cover plate;

[0032] 20, filter;

[0033] 21, cavity; 211, positioning column; 2111, threaded hole;

[0034] 22, resonant rod; 221, ring rib; 222, positioning cavity;

[0035] 23, fastening screw; 231, head portion. DETAILED DESCRIPTION

[0036] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0039] In this paper, the reference to "embodiments" means that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0041] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", etc. should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] The embodiments of the first aspect of the present application propose a filter. Please refer to Figure 2 The filter 10 includes a cavity 11, a resonant rod 12, and a fastener 13. The inner side of the bottom wall of the cavity 11 is provided with a positioning column 111, and the positioning column 111 has a fixing hole 1111; the inner wall surface of the resonant rod 12 is provided with a positioning rib 1221, the positioning column 111 is inserted into the space surrounded by the positioning rib 1221, and the end face of the positioning column 111 away from the bottom wall of the cavity 11 is lower than the side face of the positioning rib 1221 facing away from the bottom wall of the cavity 11; the fastener 13 includes a rod portion 131 and a head portion 132 provided on the rod portion 131, the rod portion 131 is fixedly connected in the fixing hole 1111, and the head portion 132 abuts against the side face of the positioning rib 1221 facing away from the bottom wall of the cavity 11.

[0045] The inner side of the bottom wall of the cavity 11 is provided with a positioning column 111, and it can be understood that the positioning column 111 can be integrally formed with the bottom wall of the cavity 11; or the positioning column 111 can be fixedly connected on the bottom wall of the cavity 11 by welding, bonding, clamping, interference connection, riveting, threaded connection, fastener connection, etc.

[0046] Among them, the cross section of the positioning column 111 parallel to the bottom wall of the cavity 11 can be circular, elliptical, polygonal, etc.

[0047] The positioning column 111 has a fixing hole 1111, which is optionally a blind hole, i.e., the aperture of the fixing hole 1111 faces the cover plate 14 and the fixing hole 1111 does not penetrate the bottom wall of the cavity 11. The cover plate 14 can be fixedly connected at the opening of the cavity 11 by welding, bonding, clamping, interference fit, riveting, threaded connection, fastener connection, etc. Optionally, the cover plate 14 is provided with a tuning screw to adjust the resonant frequency of the filter 10.

[0048] The cross section of the fixing hole 1111 parallel to the bottom wall of the cavity 11 can be circular, elliptical, polygonal, etc.

[0049] The inner wall surface of the resonant rod 12 is provided with a positioning rib 1221. It can be understood that the positioning rib 1221 can be integrally formed with the inner wall of the resonant rod 12; or the positioning rib 1221 can be fixedly connected on the inner wall of the resonant rod 12 by welding, bonding, clamping, interference fit, riveting, threaded connection, fastener connection, etc. Optionally, the resonant rod 12 is a metal resonant rod.

[0050] It can be understood that the positioning rib 1221 can be an annular rib or a C-shaped rib; or the positioning rib 1221 can also include a plurality of arc-shaped rib segments, which are arranged at intervals around the rod portion 131 of the fastener 13. The positioning rib 1221 protrudes from the inner wall surface of the resonant rod 12.

[0051] The positioning column 111 is inserted into the space surrounded by the positioning rib 1221, i.e., the positioning rib 1221 and the positioning column 111 are positioned and matched in the direction parallel to the bottom wall of the cavity 11 to avoid the movement of the resonant rod 12 in the direction parallel to the bottom wall of the cavity 11. Therefore, the positioning rib 1221 not only plays a role in positioning and matching with the positioning column 111, but also plays a role in bearing pressure when cooperating with the head portion 132 of the fastener 13.

[0052] In the depth direction of the cavity 11 (i.e., the Z direction in Figure 2 , the end surface of the positioning column 111 away from the bottom wall of the cavity 11 is lower than the side surface of the positioning rib 1221 away from the bottom wall of the cavity 11, and the head portion 132 abuts against the side surface of the positioning rib 1221 away from the bottom wall of the cavity 11. It can be understood that a gap X is formed between the head portion 132 of the fastener 13 and the positioning column 111, as shown in Figure 3 . That is, when the fastener 13 fastens the resonant rod 12 to the bottom wall of the cavity 11, the existence of the gap X ensures that the head portion 132 of the fastener 13 will not contact the positioning column 111, thereby ensuring that the head portion 132 of the fastener 13 presses the resonant rod 12 tightly against the bottom wall of the cavity 11.

[0053] The end surface of the positioning column 111 away from the bottom wall of the cavity 11, i.e., Figure 2The upper end surface of the positioning column 111 is located in the upper side of the positioning rib 1221. Figure 2 The upper side of the positioning rib 1221 is located in the upper side of the positioning column 111.

[0054] The fastener 13 includes a rod portion 131 and a head portion 132 arranged on the rod portion 131. It can be understood that the rod portion 131 and the head portion 132 can be integrally formed; or the head portion 132 can be fixedly connected to the rod portion 131 by welding, bonding, clamping, interference fit, riveting, threaded connection, fastener connection, etc.

[0055] The rod portion 131 is fixedly connected in the fixing hole 1111. The application does not limit the connection mode of the rod portion 131 in the fixing hole 1111. For example, the rod portion 131 can be screwed into the fixing hole 1111; or the rod portion 131 can be clamped into the fixing hole 1111; or the rod portion 131 can be interference fit into the fixing hole 1111.

[0056] It can be understood that the projection of the rod portion 131 on the bottom wall of the cavity 11 can be located in the projection of the head portion 132 on the bottom wall of the cavity 11. For example, the projections of the rod portion 131 and the head portion 132 are both circular, and the diameter of the projection of the rod portion 131 is smaller than the diameter of the projection of the head portion 132; or the projection of the rod portion 131 on the bottom wall of the cavity 11 can be partially located in the projection of the head portion 132 on the bottom wall of the cavity 11 and partially located outside the projection of the head portion 132 on the bottom wall of the cavity 11. For example, the projection of the head portion 132 is strip-shaped, the projection of the rod portion 131 is circular, the length of the projection of the head portion 132 is greater than the diameter of the projection of the rod portion 131, and the width of the projection of the head portion 132 is smaller than the diameter of the projection of the rod portion 131.

[0057] The filter 10 provided by the application has the following beneficial effects: since the positioning column 111 is inserted into the space surrounded by the positioning rib 1221, and the head portion 132 of the fastener 13 abuts against the side of the positioning rib 1221 away from the bottom wall of the cavity 11, the distance between the head portion 132 of the fastener 13 and the positioning column 111 can be as small as possible under the condition that the end surface of the positioning column 111 away from the bottom wall of the cavity 11 is lower than the side of the positioning rib 1221 away from the bottom wall of the cavity 11, which is equivalent to reducing the size of the positioning rib 1221 in the depth direction of the cavity 11, so as to further reduce the height of the fastener 13, thereby giving a single cavity a wider frequency design range.

[0058] Please refer to Figure 2 In some embodiments, the hole wall of the fixing hole 1111 is provided with an internal thread, and the outer periphery of the rod portion 131 is provided with an external thread. It can be understood that the fixing hole 1111 is a circular hole, and the rod portion 131 is a circular cylinder.

[0059] It can be understood that the hole wall of the fixing hole 1111 can be provided with an internal thread entirely or partially.

[0060] It can be understood that the outer circumferential surface of the rod portion 131 can be provided with external threads in whole or in part.

[0061] Based on the above technical solution, the fastener 13 is threadedly connected to the positioning column 111 to fasten the resonant rod 12 to the bottom wall of the cavity 11, and the fastening manner is relatively simple and conducive to later disassembly.

[0062] In other embodiments, one of the hole wall of the fixing hole 1111 and the outer circumferential surface of the rod portion 131 is provided with a clamping hook, and the other is provided with a clamping groove, and the fastener 13 is clamped to the positioning column 111 to fasten the resonant rod 12 to the bottom wall of the cavity 11; or the hole wall of the fixing hole 1111 is a light hole, the outer circumferential surface of the rod portion 131 is a light surface, and the diameter of the rod portion 131 is greater than that of the fixing hole 1111, and the fastener 13 is interference connected to the positioning column 111 to fasten the resonant rod 12 to the bottom wall of the cavity 11.

[0063] Please refer to Figure 6 In some embodiments, the fastener 13 is a fastening screw or a fastening bolt, that is, the rod portion 131 and the head portion 132 of the fastener 13 are integrally formed.

[0064] Optionally, the head portion 132 of the fastening screw has a keyway 1321, and a tool is inserted into the keyway 1321 to screw the fastening screw. Of course, the head portion 132 of the fastening screw can have a slot, a cross slot, a square slot, a hexagonal slot, etc.

[0065] Optionally, the head portion 132 of the fastening bolt can be a square structure, a hexagonal structure, etc.

[0066] Optionally, the positioning column 111 is a cylinder, and the diameter of the head portion 132 of the fastener 13 is greater than that of the positioning column 111, so that the edge of the head portion 132 of the fastener 13 can abut against the positioning rib 1221. Among them, the size of the head portion 132 of the fastener 13 can be increased as much as possible to increase the abutting area of the head portion 132 and the positioning rib 1221, thereby ensuring the stability of the resonant rod 12 fixed on the bottom wall of the cavity 11.

[0067] Based on the above technical solution, since the fastening screw or the fastening bolt is a standard part, the fastener 13 is designed as a fastening screw or a fastening bolt, which is easy to obtain.

[0068] Please refer to Figure 5 In some embodiments, the positioning rib 1221 is an annular rib, and the space surrounded by the positioning rib 1221 is a positioning hole 1222. Among them, the positioning column 111 is inserted into the positioning hole 1222.

[0069] The size of the positioning rib 1221 in the depth direction of the cavity 11 can be reduced as much as possible to further reduce the height of the head 132 of the fastener 13 while meeting the structural strength.

[0070] According to the above scheme, the positioning rib 1221 is designed as a ring-shaped rib, which can improve the force uniformity when the head 132 of the fastener 13 abuts against the positioning rib 1221, thereby ensuring the stability of the resonant rod 12 fixed on the bottom wall of the cavity 11.

[0071] In other embodiments, the positioning rib 1221 can be a C-shaped rib, although the C-shaped rib has a gap, but does not affect the positioning cooperation between the C-shaped rib and the positioning column 111; or the positioning rib 1221 can also include a plurality of arc-shaped rib segments, which are arranged at intervals around the rod portion 131 of the fastener 13.

[0072] In some embodiments, the positioning hole 1222 is a circular hole, and the positioning column 111 is a circular column. The diameter of the circular hole is consistent with the diameter of the circular column.

[0073] According to the above technical scheme, the positioning hole 1222 is designed as a circular hole, and the positioning column 111 is designed as a circular column, which is beneficial to the processing of the positioning hole 1222 and the positioning column 111; and the installation angle does not need to be considered when the resonant rod 12 is installed, which is beneficial to the installation of the resonant rod 12 on the bottom wall of the cavity 11.

[0074] In other embodiments, the positioning hole 1222 is a polygonal hole, and the positioning column 111 is a prism. For example, the positioning hole 1222 is a rectangular hole, and the positioning column 111 is a four-prism adapted to the rectangular hole; or the positioning hole 1222 is a five-edged hole, and the positioning column 111 is a five-prism adapted to the rectangular hole; or the positioning hole 1222 is a six-edged hole, and the positioning column 111 is a six-prism adapted to the rectangular hole.

[0075] Please refer to Figure 2 and Figure 5 In some embodiments, the resonant rod 12 includes a first rod segment 121 and a second rod segment 123. The first rod segment 121 is located on the side of the positioning rib 1221 away from the bottom wall of the cavity 11, and the second rod segment 123 is located on the side of the positioning rib 1221 facing the bottom wall of the cavity 11. The wall thickness of the second rod segment 123 is smaller than that of the first rod segment 121.

[0076] The resonant rod 12 is a cylindrical structure.

[0077] Optionally, the resonant rod 12 further comprises a middle rod section 122, the middle rod section 122 is between the first rod section 121 and the second rod section 123, and the positioning rib 1221 is on the inner wall surface of the middle rod section 122. The positioning rib 1221 can be integrally formed with the middle rod section 122, or the positioning rib 1221 can be fixedly connected to the inner wall of the middle rod section 122 by welding, bonding, clamping, interference fit, riveting, threaded connection, fastener connection, etc.

[0078] The first rod section 121 is on the side of the positioning rib 1221 away from the bottom wall of the cavity 11, that is, on the Figure 2 side of the positioning rib 1221 away from the bottom wall of the cavity 11, that is, on the Figure 2 side of the positioning rib 1221 away from the bottom wall of the cavity 11, that is, on the

[0079] Based on the above technical solution, since the wall thickness of the second rod section 123 is smaller than the wall thickness of the first rod section 121, the contact area between the lower end surface of the second rod section 123 and the bottom wall of the cavity 11 is small, which is beneficial to optimize the intermodulation index of the filter 10; and a large weight-reducing cavity is formed between the second rod section 123 and the positioning column 111, which can reduce the weight of the resonant rod 12, wherein the weight-reducing cavity is an annular cavity.

[0080] In other embodiments, the wall thickness of the second rod section 123 can be equal to the wall thickness of the first rod section 121, at this time, the inner wall surface of the second rod section 123 is still a distance away from the outer wall surface of the positioning column 111, and the distance is the size of the positioning rib 1221 in the radial direction of the positioning column 111. Alternatively, the wall thickness of the second rod section 123 can be greater than the wall thickness of the first rod section 121, but the second rod section 123 does not contact the positioning column 111.

[0081] Please refer to Figure 4 and Figure 5 In some embodiments, the positioning column 111 has a first guide slope 1112 that guides the positioning column 111 into the space surrounded by the positioning rib 1221; and the positioning rib 1221 has a second guide slope 1223 that guides the positioning column 111 into the space surrounded by the positioning rib 1221.

[0082] The first guide slope 1112 is at the end of the positioning column 111 away from the bottom wall of the cavity 11, that is, at Figure 2 the upper end of the positioning column 111. It can be understood that the first guide slope 1112 can be an arc-shaped slope, or a straight slope.

[0083] The second guide slope 1223 is at the side of the positioning rib 1221 close to the bottom wall of the cavity 11, that is, at Figure 2The second guide slope 1223 is located at the lower side of the positioning rib 1221. It can be understood that the second guide slope 1223 can be an arc-shaped slope or a straight slope.

[0084] Based on the above technical solution, when the positioning column 111 enters the space surrounded by the positioning rib 1221, the first guide slope 1112 and the second guide slope 1223 cooperate with each other to facilitate the positioning column 111 to enter the space surrounded by the positioning rib 1221.

[0085] In other embodiments, the positioning column 111 has the first guide slope 1112 for guiding the positioning column 111 to enter the space surrounded by the positioning rib 1221, and the positioning rib 1221 does not have the second guide slope 1223 for guiding the positioning column 111 to enter the space surrounded by the positioning rib 1221; or the positioning column 111 does not have the first guide slope 1112 for guiding the positioning column 111 to enter the space surrounded by the positioning rib 1221, and the positioning rib 1221 has the second guide slope 1223 for guiding the positioning column 111 to enter the space surrounded by the positioning rib 1221.

[0086] In some embodiments, the resonant bar 12 is a cold heading bar, that is, the resonant bar 12 is a resonant bar made by a cold heading process.

[0087] Based on the above technical solution, the cold heading process has the advantages of high production efficiency and good product quality, and can improve material utilization, reduce material consumption, and reduce production cost.

[0088] In other embodiments, the resonant bar 12 can also be made by machining.

[0089] The second aspect of the present application proposes a communication device, which comprises the filter 10 as described in the first aspect.

[0090] The communication device adopts any one or more embodiments of the above filter 10, and thus has the beneficial effects of the above embodiments, which will not be repeated here.

[0091] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A filter, characterized in that: The device includes a cavity, a resonant rod, and fasteners. The cavity has a positioning post on its inner bottom wall with a fixing hole. The resonant rod has a positioning rib on its inner wall. The positioning post is inserted into the space enclosed by the positioning rib, and the end face of the positioning post away from the bottom wall of the cavity is lower than the side of the positioning rib facing away from the bottom wall of the cavity. The fastener includes a rod portion and a head on the rod portion. The rod portion is fixedly connected to the fixing hole, and the head abuts against the side of the positioning rib facing away from the bottom wall of the cavity.

2. The filter as described in claim 1, characterized in that: The fixing hole has internal threads on its wall and the rod has external threads on its outer circumferential surface.

3. The filter as described in claim 2, characterized in that: The fastener is a fastening screw or a fastening bolt.

4. The filter as described in claim 1, characterized in that: The positioning rib is a ring rib, and the space enclosed by the positioning rib is a positioning hole.

5. The filter as described in claim 4, characterized in that: The positioning hole is a circular hole, and the positioning post is a circular post; or, the positioning hole is a polygonal hole, and the positioning post is a prism.

6. The filter as described in any one of claims 1-5, characterized in that: The resonant rod includes a first rod segment and a second rod segment. The first rod segment is located on the side of the positioning rib facing away from the bottom wall of the cavity, and the second rod segment is located on the side of the positioning rib facing the bottom wall of the cavity. The wall thickness of the second rod segment is less than or equal to the wall thickness of the first rod segment.

7. The filter as described in any one of claims 1-5, characterized in that: The positioning post has a first guiding slope that guides the positioning post into the space enclosed by the positioning rib; and / or, the positioning rib has a second guiding slope that guides the positioning post into the space enclosed by the positioning rib.

8. The filter as described in any one of claims 1-5, characterized in that: The positioning post is integrally formed with the bottom wall of the cavity.

9. The filter as described in any one of claims 1-5, characterized in that: The resonant rod is a cold-forged rod.

10. A communication device, characterized in that: Includes the filter as described in any one of claims 1-9.

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