Filter and communication device

Abstract

The present invention provides a filter and a communication device. The filter comprises a shell; a resonant cavity is formed in the shell; a mounting column and a resonant column which are coaxial are provided in the resonant cavity; the mounting column is vertically arranged at the bottom of the resonant cavity; a mounting hole is formed in the mounting column; the resonant column comprises a first column body and a second column body which are connected; a through resonant hole is formed in the resonant column; the second column body is inserted into the mounting hole; the size of the cross section of the first column body is greater than that of the cross section of the resonant column; the second column body is inserted into the mounting hole and is connected and fixed to the bottom of the mounting hole. In the present invention, the circumferential and axial movements of the resonant column are constrained by means of the mounting hole, so that the resonant column is stably arranged in the mounting hole and does not randomly shake; moreover, there is no need to machine threads on the outer side wall of the resonant column and the hole wall of the mounting hole, maintaining the electrical consistency of the filter, improving the working stability of the filter.

Description

Filters and communication equipment Technical Field

[0001] The present invention belongs to the technical field of mobile communications, and in particular relates to a filter and a communication device equipped with the filter. Background Art

[0002] The filter is a frequency-selective device and an indispensable part of communication equipment. With the rapid development of communication systems, the reliability of the filter is one of the key factors affecting the antenna system.

[0003] The resonant cavity of a traditional filter is provided with a boss, and a resonant column is provided on the boss. The resonant column and the boss are threadedly connected by screws to fix the resonant column on the surface of the boss. However, since the resonant column has a certain length, the resonant column will produce circumferential displacement and looseness, making it difficult to grasp the consistency of electrical performance.

[0004] To this end, the industry has proposed setting a slot in the boss, and processing an internal thread in the slot, processing an external thread on the outer wall of the resonant column, inserting the resonant column into the slot, so that the resonant column and the slot are directly threaded together, so as to facilitate the stable fixation of the resonant column on the boss. However, processing threads on the slot and the resonant column is prone to processing errors, and there is also the situation where the consistency of electrical performance is difficult to grasp. In addition, processing threads on the slot and the outer wall of the resonant column requires destructive processing of the slot and the outer wall of the resonant column, which makes it difficult to control the consistency of the electrical performance of the filter, resulting in poor performance of the filter. If the processing accuracy of the thread is improved, the processing cost will rise sharply, making the production cost of the filter too high and difficult to apply on a large scale.

[0005] Summary of the Invention

[0006] The present invention aims to solve at least one of the above problems and provide a filter and a communication device.

[0007] To adapt to the various purposes of the present invention, the present invention adopts the following technical solutions:

[0008] A filter is provided to meet one of the purposes of the present invention, including a shell, a resonant cavity is provided in the shell, a coaxial mounting post and a resonant post are provided in the resonant cavity, the mounting post is vertically arranged at the bottom of the resonant cavity, a mounting hole is provided in the mounting post, the resonant post includes a first column and a second column connected in sequence from top to bottom, a resonant hole is provided in the resonant column that passes through the first column and the second column, the second column is inserted into the mounting hole, the cross-section of the first column is larger than the cross-section of the resonant column and a positioning step is formed between the first column and the second column, the positioning step cooperates and abuts against the mounting post, the second column is inserted into the mounting hole and is connected and fixed at the bottom of the mounting hole.

[0009] Furthermore, a hole wall of the mounting hole and an outer side wall of the second column are clearance-fitted.

[0010] Specifically, the bottom surface of the second column is loosely matched with the bottom of the mounting hole, and the second column has a bottom surface, and the bottom wall is threadedly connected to the bottom of the mounting hole to fix the resonant column in the mounting column.

[0011] Specifically, the resonant column is formed in one piece.

[0012] Specifically, the depth of the resonance hole is greater than 1 / 2 of the distance between the cavity bottom and the cavity top of the resonance cavity.

[0013] Specifically, the resonant hole includes a first resonant hole provided in the first column and a second resonant hole provided in the second column. The hole depth of the first resonant hole is smaller than the hole depth of the second resonant hole, and the size of the first resonant hole is larger than the size of the second resonant hole.

[0014] Specifically, the length of the first column is associated with the temperature drift of the filter.

[0015] Specifically, the resonant column is integrally formed of sheet metal.

[0016] Specifically, the filter further includes a tuning component. A through hole is provided on the shell, and the tuning component is inserted into the resonant hole through the through hole.

[0017] To meet one of the objectives of the present invention, a communication device is provided, comprising one or more filters as described in any one of the preceding objectives.

[0018] Compared with the prior art, the present invention has many advantages, including but not limited to:

[0019] The filter of the present invention is provided with a mounting column and a resonance column in the resonance cavity, the positioning step of the resonance column abuts against the mounting column, so that the resonance column and the mounting column are coordinated for positioning, the second column body of the resonance column is inserted into the mounting hole of the mounting column, and the circumferential movement of the resonance column is constrained by the mounting hole, and the bottom of the resonance column is connected and fixed to the bottom of the mounting hole to constrain the axial movement of the resonance column, so that the resonance column is stably set in the mounting hole without shaking at will.

[0020] Moreover, there is no need to process threads on the outer wall of the resonant column and the wall of the mounting hole, thereby maintaining the electrical consistency of the filter of the present invention and improving the working performance of the filter. Unlike traditional filters, threads are not processed on the outer wall of the resonant column and the wall of the mounting hole, which affects the electrical consistency of the resonant column and the mounting hole, thereby causing the electrical performance of the traditional filter to deteriorate and affecting the working performance of the traditional filter.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows, will be obvious from the description, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0023] FIG1 is a schematic cross-sectional view of a filter according to an exemplary embodiment of the present invention.

[0024] FIG2 is a schematic cross-sectional view of a housing of a filter according to an exemplary embodiment of the present invention.

[0025] FIG3 is a schematic structural diagram of a resonant column of a filter according to a typical embodiment of the present invention.

[0026] FIG4 is a schematic cross-sectional view of FIG3 .

[0027] FIG5 is a schematic structural diagram of a resonant column of a filter according to another embodiment of the present invention. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention.

[0029] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the description of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. In addition, "connected" or "coupled" as used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0031] The present invention provides a filter, which is provided with a mounting column and a resonance column in a resonance cavity, wherein the second column body of the resonance column is inserted into the mounting hole of the mounting column, and the circumferential movement of the resonance column is constrained by the mounting hole, and the bottom of the resonance column is fixedly connected to the bottom of the mounting hole to constrain the axial movement of the resonance column, so that the resonance column is stably arranged in the mounting hole without shaking at will, and there is no need to process threads on the outer wall of the resonance column and the hole wall of the mounting hole to maintain the electrical consistency of the filter and improve the working stability of the filter.

[0032] In a typical embodiment of the present invention, in combination with Figure 1, the filter 100 includes a housing 110 and a tuning element 151, a resonant cavity 120 is provided in the housing 110, a mounting post 130 and a resonant post 140 are provided in the resonant cavity 120, and the mounting post 130 and the resonant post 140 are arranged along the same axis.

[0033] 1 and 2 , the mounting post 130 is fixed to the bottom of the resonant cavity 120. The mounting post 130 is vertically arranged and extends from the bottom 121 of the resonant cavity 120 toward the top 122 of the resonant cavity 120. The mounting post 130 is provided with a mounting hole 131, which is arranged along the axial direction of the mounting post 130. The mounting hole 131 is a blind hole, and a first opening 132 is provided at the top of the mounting post 130. Preferably, the mounting post 130 is integrally formed with the resonant cavity 120.

[0034] 3 , the resonant column 140 includes a first column 141 and a second column 142. The end of the first column 141 is connected to the beginning of the second column 142. The cross-sectional dimensions of the first column 141 are larger than those of the second column 142. The cross-sectional dimensions of the first column 141 are larger than those of the second column 142, and the cross-sectional dimensions of the first column 141 are larger than those of the cross-sectional dimensions of the mounting hole 131. The cross-sectional dimensions of the second column 142 are smaller than those of the cross-sectional dimensions of the mounting hole 131. In conjunction with FIG1 , the second column 142 can be inserted into the mounting hole 131, and the first column 141 relatively protrudes from the mounting hole 131. In this embodiment, the second column 142 is completely inserted into the mounting hole 131. Preferably, the resonant column 140 is a one-piece molded part.

[0035] The cross-sectional dimension of the second column 142 is smaller than the cross-sectional dimension of the mounting hole 131. When the second column 142 is inserted into the mounting hole 131, the mounting hole 131 can constrain the circumferential movement of the second column 142, so that the second column 142 will not fall out of the mounting hole 131 in the circumferential direction of the mounting hole 131, so that the second column 142 can be stably set in the mounting hole 131.

[0036] 3 , because the cross-sectional dimensions of the first column 141 are larger than those of the second column 142, a positioning step 143 is formed at the junction of the first column 141 and the second column 142. In other words, the bottom surface of the first column 141 is in contact with the top surface of the second column 142, and a portion of the bottom surface of the first column 141 protrudes relative to the top surface of the second column 142, constituting the positioning step 143. In conjunction with FIG2 , the mounting post 130 forms a landing 133 around the first opening 132 of the mounting hole 131. In conjunction with FIG1 , the positioning step 143 abuts against the landing 133, allowing the resonant column 140 to be stably inserted into the mounting hole 131.

[0037] 3 , 2 , and 1 , the bottom surface 1421 of the second column 142 faces the bottom 1311 of the mounting hole 131, and the bottom surface 1421 of the second column 142 is suspended above the bottom 1311 of the mounting hole 131. In other words, there is a clearance fit between the bottom surface 1421 of the second column 142 and the bottom 1311 of the mounting hole 131. The bottom surface 1421 of the second column 142 is threadedly connected to the bottom 1311 of the mounting hole 131, so that the positioning step 143 tightly abuts against the landing 133, thereby stably mounting the resonant column 140 in the mounting hole 131. Preferably, the bottom surface 1421 of the second column 142 is concave to improve the structural stability of the bottom surface 1421 of the second column 142 and reduce deformation when subjected to force, thereby facilitating a threaded connection between the bottom surface 1421 of the second column 142 and the bottom 1311 of the mounting hole 131. In one embodiment, the gap between the bottom surface 1421 of the second column 142 and the bottom 1311 of the mounting hole 131 is greater than 0.2 mm.

[0038] 4 , the resonant column 140 further includes a resonant hole 144. The resonant hole 144 extends from the first column 141 to the second column 142. The resonant hole 144 is a blind hole, and a second opening 1441 is defined on the top surface of the first column 141. The depth of the resonant hole 144 is at least 1 / 2 of the depth of the resonant cavity 120. The straight-line distance between the cavity bottom 121 and the cavity top 122 of the resonant cavity 120 is the cavity depth. Preferably, the depth of the resonant hole 144 is at least 2 / 3 of the depth of the resonant cavity 120.

[0039] 4 , the resonant hole 144 includes a first resonant hole 145 and a second resonant hole 146. The first resonant hole 145 is disposed on the first column 141, and the second resonant hole 146 is disposed on the second column 142. The first resonant hole 145 and the second resonant hole 146 are interconnected. Furthermore, the cross-sectional dimension of the first resonant hole 145 is larger than the cross-sectional dimension of the second resonant hole 146.

[0040] Specifically, the second resonant hole 146 extends to the bottom of the second column 142, and a first screw hole 1461 is provided at the bottom of the second resonant hole 146; a second screw hole 1312 is provided at the bottom 1311 of the mounting hole 131 corresponding to the first screw hole 1461, and the first screw hole 1461 and the second screw hole 1312 are connected by screws to ensure that the resonant column 140 is stably set on the mounting column 130.

[0041] The bottom surface 1421 of the second column 142 is threadedly connected to the bottom 1311 of the mounting hole 131 to restrict the axial movement of the second column 142 so that the resonant column 140 cannot escape from the mounting hole 131 along the axial direction of the mounting hole 131.

[0042] Thus, the second column 142 is inserted into the mounting hole 131 to constrain the circumferential movement of the resonant column 140; the bottom surface 1421 of the second column 142 is threadedly connected to the bottom 1311 of the mounting hole 131 to constrain the axial movement of the second column 142; the second column 142 is constrained in the axial and circumferential directions respectively through the mounting hole 131, so that the resonant column 140 will not fall out of the mounting hole 142, so that the resonant column 140 is stably set in the mounting hole 142, without the need to set an external thread on the outer wall of the resonant column of a traditional filter and set an internal thread in the mounting hole, so that the resonant column and the mounting hole are threadedly connected, thereby causing destructive processing on the mounting hole and the resonant column due to the setting of the thread, affecting the electrical consistency of the traditional filter.

[0043] Furthermore, communication equipment is sensitive to electrical performance. Traditional filters require threads on their resonant columns and mounting holes. However, the threads are machined on the outer wall of the resonant column and the wall of the mounting hole. This is affected by machining accuracy, resulting in different threading accuracies in different areas of the outer wall of the resonant column and / or the wall of the mounting hole. This affects the electrical consistency of the resonant column and the mounting hole, resulting in poor electrical performance of traditional filters. Furthermore, because the threads are inherently uneven, the electrical performance of different areas of the threads also varies. For example, the distance between the inner and outer diameters of the threads is large, resulting in different electrical performance between the inner and outer diameters of the threads, thus affecting the electrical performance of the traditional resonant column and the mounting hole.

[0044] Furthermore, since the resonant column of the traditional filter has an external thread on the outer wall and an internal thread in the mounting hole, the outer wall of the resonant column is threadedly connected to the hole wall of the mounting hole. The threaded connection is a more complex contact connection method, which causes the current on the resonant column and the current on the mounting hole to affect each other, thereby greatly affecting the electrical performance of the traditional filter, and then affecting the working performance of the traditional filter.

[0045] 2 and 3 , the outer sidewall 1422 of the second column 142 of the filter 100 of the present invention is a smooth surface, so that the resonant column 140 has good electrical consistency. The hole wall 1313 of the mounting hole 131 is also a smooth surface, so that the mounting column 130 also has good electrical consistency. The outer sidewall 1422 of the second column 142 and the hole wall 1313 of the mounting hole 131 are clearance-fitted, so that the outer sidewall 1422 of the second column 142 does not contact the hole wall 1313 of the mounting hole 131, thereby avoiding the mutual influence between the current on the resonant column 140 and the current on the mounting column 130, thereby improving the electrical performance of the filter 100 of the present invention, thereby improving the filtering performance of the filter 100.

[0046] 1 , the housing 110 is provided with a through hole 111, and the tuning member 151 is inserted into the resonant hole 144 on the resonant column 140 through the through hole 111. Specifically, the tuning member 151 is inserted into the resonant hole 144 from the second opening 1441 of the resonant hole 144, and the length of the tuning member 151 is greater than the depth of the resonant hole 144, so that the tuning member 151 can be inserted to the bottom of the resonant hole 144.

[0047] Because the depth of the resonant hole 144 is greater than or equal to 1 / 2 of the depth of the resonant cavity 120, the range of movement of the tuning element 151 within the resonant hole 144 is greater than or equal to 1 / 2 of the depth of the resonant cavity 120. In other words, the range of movement of the tuning element 151 within the resonant cavity 120 is greater than or equal to 1 / 2 of the depth of the resonant cavity 120. As a result, the tuning element 151 of the filter 100 of the present invention can be inserted into the resonant cavity at a depth far greater than that of a tuning screw of a conventional filter, thereby expanding the filtering frequency band of the filter 100 of the present invention and improving the performance of the filter 100. Preferably, the tuning element 151 is a tuning screw.

[0048] The length of the first cylinder 141 is associated with the temperature drift of the filter 100. By adjusting the length of the first cylinder 141, the filter 100 is temperature compensated to optimize the temperature drift of the filter 100. For example, the zero point can be increased or decreased by extending the length of the first cylinder 141, or the zero point can be decreased or increased by shortening the hole depth of the first cylinder 141.

[0049] In this embodiment, while the overall length of the resonant column 140 remains unchanged, the length of the first column 141 is changed to optimize the temperature drift of the filter 100. The specific length of the first column 141 can be determined by those skilled in the art through experiments after understanding the present invention, and is not limited herein.

[0050] In one embodiment, the cross-sectional dimension of the first resonant hole 145 is larger than the cross-sectional dimension of the mounting hole 131, and the cross-sectional dimension of the first resonant hole 145 is larger than the cross-sectional dimension of the mounting post 130. In other words, the cross-sectional dimension of the first resonant hole 145 of the present invention is larger than the cross-sectional dimension of the resonant post of a conventional filter. The increase in the cross-sectional dimension of the first resonant hole 145 can reduce the intensity of the electric field concentrated on the first post 141, thereby improving the power capacity of the filter 100 and improving the performance of the filter 100.

[0051] In one embodiment, referring to Figures 3 and 4 , a portion of the first resonant hole 145 near the second opening 1441 is turned outward to form a disc 147. This disc 147 lowers the resonant frequency of the filter 100 without increasing the volume of the resonant cavity 120, thereby improving space utilization and facilitating miniaturization of the filter 100. In a further embodiment, referring to Figure 5 , the disc is bent to form a flange 148 to further lower the resonant frequency of the filter 100.

[0052] In one embodiment, the mounting column 130 is a cylinder, and the cross-section of the mounting hole 131 is circular; the first column 141 and the second column 142 of the resonant column 140 are both cylinders, and the cross-sections of the first resonant hole 145 and the second resonant hole 146 of the resonant hole 144 are both circular.

[0053] In one embodiment, the resonant column 140 is formed from a single piece of sheet metal. Unlike conventional filters, the resonant column 140 of the present invention does not require threading, so the manufacturing cost of the resonant column 140 of the present invention is lower, facilitating the large-scale promotion and use of the filter 100 of the present invention.

[0054] In one implementation, the filter 100 is a low-frequency filter.

[0055] The present invention further provides a communication device comprising a plurality of filters as described above. The communication device may be a combiner, a multi-system access platform, a duplexer, an antenna system, etc.

[0056] To sum up, the filter of the present invention does not need to have threads on the outer wall of the resonant column and the wall of the mounting hole, so the resonant column can be stably set in the mounting hole, thereby avoiding the electrical consistency of the filter being affected by processing threads on the outer wall of the resonant column and the wall of the mounting hole, thereby improving the electrical performance of the filter and improving the working performance of the filter.

[0057] The above description is merely an illustration of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this invention is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions invented in this invention.

[0058] Although the subject matter has been described in language specific to structural features and / or methodological logical acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.

Claims

1. A filter, comprising a housing, wherein a resonant cavity is provided in the housing, characterized in that: A coaxial mounting column and a resonance column are provided in the resonance cavity, the mounting column is vertically arranged at the bottom of the resonance cavity, a mounting hole is provided in the mounting column, the resonance column comprises a first column and a second column sequentially connected from top to bottom, a resonance hole is provided in the resonance column which passes through the first column and the second column, the second column is inserted in the mounting hole, the cross-sectional size of the first column is larger than the cross-sectional size of the resonance column and a positioning step is formed between the first column and the second column, the positioning step cooperates and abuts against the mounting column, the second column is inserted in the mounting hole and is connected and fixed at the bottom of the mounting hole.

2. The filter according to claim 1, characterized in that The hole wall of the mounting hole and the outer side wall of the second column are clearance-matched.

3. The filter according to claim 1, characterized in that The bottom surface of the second column is loosely matched with the bottom of the mounting hole, and the second column has a bottom surface, and the bottom wall is threadedly connected to the bottom of the mounting hole to fix the resonant column in the mounting column.

4. The filter according to claim 1, characterized in that The resonant column is integrally formed.

5. The filter according to claim 1, characterized in that The depth of the resonance hole is greater than 1 / 2 of the distance between the cavity bottom and the cavity top of the resonance cavity.

6. The filter according to claim 1, characterized in that The resonance hole comprises a first resonance hole arranged in the first column and a second resonance hole arranged in the second column. The hole depth of the first resonance hole is smaller than the hole depth of the second resonance hole, and the size of the first resonance hole is larger than the size of the second resonance hole.

7. The filter according to claim 1, characterized in that The length of the first column is correlated with the temperature drift of the filter.

8. The filter according to claim 1, characterized in that The resonant column is integrally formed of sheet metal.

9. The filter according to any one of claims 1 to 8, characterized in that: The filter further comprises a tuning component. A through hole is provided on the shell, and the tuning component is inserted into the resonance hole through the through hole.

10. A communication device, characterized in that: Comprising one or more filters as claimed in any one of claims 1 to 9.

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