Filtering device and electronic device

Abstract

The application relates to the field of filters, and discloses a filter device and electronic equipment. The filter device comprises a first filter and a second filter. The first filter has an input end and an output end. The first filter has a first passband frequency. The second filter is arranged at the input end and / or the output end. The second filter has a second passband frequency. The second passband frequency covers the first passband frequency. The application sets the second filter at the input end and / or the output end. The second passband frequency of the second filter covers the first passband frequency of the first filter. The second filter resonates in a specific high-frequency area, thereby suppressing high-order modes of the first filter. The application overcomes the problem of a high-frequency suppression blind area caused by parasitic resonance of a traditional coaxial low-pass filter. The filter device still maintains a high suppression level in an extremely high-frequency band. The design that the second passband frequency covers the first passband frequency ensures that the performance of the first filter is not affected.

Description

Technical Field

[0001] This application relates to the field of filters, and more particularly to a filtering device and electronic device. Background Technology

[0002] In mobile communication systems, radio frequency (RF) filters, as critical frequency selection devices, directly impact the system's anti-interference capability due to their high-frequency suppression performance. As communication frequency bands expand to higher frequencies, filters need to maintain high suppression levels in the extremely high-frequency range. Traditional solutions typically cascade a coaxial low-pass filter with the main filter to improve high-frequency suppression, but this structure has inherent drawbacks: the coaxial low-pass filter itself generates parasitic resonances in specific high-frequency regions, leading to a sharp deterioration in suppression performance. When the system requires the filter to maintain high suppression in the extremely high-frequency range, this resonance phenomenon creates a suppression blind zone, severely limiting the filter's high-frequency application scenarios. Especially when high-frequency suppression requirements exceed those of the conventional operating frequency band by several times, existing structures cannot meet broadband suppression demands due to their physical resonance characteristics, thus hindering improvements in filter performance. Utility Model Content

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a filtering device and electronic device.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: This application provides: A filtering device, comprising: A first filter, having an input terminal and an output terminal, and having a first passband frequency; A second filter is disposed at the input terminal and / or the output terminal, and the second filter has a second passband frequency that covers the first passband frequency.

[0005] Furthermore, the first filter includes a first housing and a plurality of first resonant rods, the first housing having a first cavity, and the first resonant rods being disposed within the first cavity.

[0006] Furthermore, the first resonant rod has a circular cross-section.

[0007] Furthermore, a mounting post is provided on the bottom wall of the first cavity, and the first resonant rod is disposed on the mounting post.

[0008] Furthermore, the first resonant rod has a second hole, the mounting post has a first hole, and the second hole communicates with the first hole.

[0009] Furthermore, the end of the first resonant rod away from the mounting post has a circumferentially arranged extension, and the extension transitions to the first resonant rod at the arc surface.

[0010] Furthermore, the second filter includes a second housing and a plurality of second resonant rods. The second housing has a second cavity that communicates with the first cavity. The second resonant rods are disposed in the second cavity and are connected to the first resonant rods via coupling lines.

[0011] Furthermore, the cross-section of the second resonant rod is circular or polygonal.

[0012] Furthermore, the second housing is integrally formed with the first housing, the first housing is provided with a first cover that closes the first cavity, and the second housing is provided with a second cover that closes the second cavity, the first cover and the second cover are integrally formed.

[0013] This application also provides an electronic device that includes the filtering device described in any of the preceding claims.

[0014] This application sets a second filter at the input and / or output terminals, and utilizes the characteristic that the second passband frequency covers the first passband frequency of the first filter to make the second filter resonate in a specific high-frequency region, thereby suppressing the high-order modes of the first filter. This overcomes the high-frequency suppression blind zone problem caused by parasitic resonance in traditional coaxial low-pass filters, and enables the filtering device to maintain a high suppression level in the extremely high frequency range. Moreover, the design that the second passband frequency covers the first passband frequency ensures that it has no impact on the performance of the first filter itself.

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of the filtering device of this application is shown; Figure 2 A top view of the filter device of this application is shown; Figure 3 This application shows Figure 2 Schematic diagram of the cross-sectional structure along the AA direction.

[0018] Explanation of key component symbols: 100 - First filter; 110 - First housing; 111 - First cavity; 112 - Mounting post; 1121 - First hole; 120 - First resonant rod; 121 - Second hole; 200 - Second filter; 210 - Second housing; 211 - Second cavity; 220 - Second resonant rod; 300 - Coupling line. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] This application provides a filtering device, which includes a first filter 100 and a second filter 200. Specifically, the first filter 100 has an input terminal and an output terminal and has a first passband frequency. The second filter 200 is disposed at the input terminal and / or the output terminal and has a second passband frequency that covers the first passband frequency.

[0025] In order to meet the high-frequency suppression requirement of the first filter 100, a coaxial low-pass filter is set on the first filter 100 to achieve the high-frequency suppression function. However, at a certain frequency (e.g., 20 GHz), the coaxial low-pass filter will resonate and thus fail to meet the high-frequency suppression requirement of the first filter 100.

[0026] To suppress the high-order modes of the first filter 100, a second filter 200 is provided at the input and / or output of the first filter 100. The second filter 200 is an ultra-wideband filter. Specifically, the second filter 200 will resonate above a certain frequency to suppress the high-order modes of the first filter 100, thereby meeting the high suppression requirement of the first filter 100. Furthermore, the second filter 200 is not part of the first filter 100, and the passband of the second filter 200 will cover the passband range of the first filter 100. That is, at this time, the second filter 200 only plays the function of high-frequency suppression and will not affect the performance of the first filter 100 itself. This greatly improves the high-frequency suppression performance of the original first filter 100.

[0027] In this embodiment, the second filter 200 can be set at the output terminal of the second filter 200.

[0028] In one embodiment, the second filter 200 is disposed at the input of the first filter 100.

[0029] In another embodiment, a second filter 200 is provided at both the input and output terminals of the first filter 100.

[0030] To more intuitively understand the relationship between the passband frequencies of the first filter 100 and the second filter 200, the first passband frequency can be set as A, satisfying: f1≤A≤f2; the second passband frequency can be set as B, satisfying: f3≤B≤f4. The first passband frequency and the second passband frequency satisfy: f3≤f1, f4>f2, that is, the second passband frequency covers the first passband frequency.

[0031] In some embodiments, the first filter 100 includes a first housing 110 and a plurality of first resonant rods 120. The first housing 110 has a first cavity 111, and the first resonant rods 120 are disposed in the first cavity 111. The first resonant rods 120 have a circular cross-section.

[0032] Please refer to 1 to Figure 3 As shown, in order to isolate the first resonant rod 120 from the external environment, a first cavity 111 is formed in the first housing 110, and the first cavity 111 is placed inside the first resonant rod 120 to prevent the first resonant rod 120 from being affected by the external environment.

[0033] In some embodiments, a mounting post 112 is provided on the bottom wall of the first cavity 111, and the first resonant rod 120 is disposed on the mounting post 112.

[0034] Please see Figure 1 and Figure 3 As shown, in order to fix the first resonant rod 120 to the inner bottom wall of the first cavity 111, a number of mounting posts 112 adapted to the first resonant rod 120 are provided on the inner bottom wall of the first cavity 111. Specifically, the first resonant rod 120 can be fastened to the mounting posts 112 by screwing screws, thereby realizing the connection and installation of the first resonant rod 120.

[0035] In some embodiments, the first resonant rod 120 has a second hole 121, the mounting post 112 has a first hole 1121, and the second hole 121 communicates with the first hole 1121.

[0036] Please continue reading. Figure 3 As shown, in order to fix the first resonant rod 120 on the mounting post 112, the first resonant rod 120 is made hollow, that is, a second hole 121 is provided inside the first resonant rod 120. Correspondingly, a first hole 1121 is opened at the end of the mounting post 112 facing the first resonant rod 120. After the first resonant rod 120 is placed on the mounting post 112, the second hole 121 and the first hole 1121 are connected. Then, the position of the first resonant rod 120 can be fixed by screwing a bolt through the second hole 121 into the first hole 1121.

[0037] It should be noted that, in order to fix the first resonant rod 120 to the mounting post 112 by screwing, the second hole 121 is a stepped hole, which includes a large hole and a small hole, forming a stepped surface between them. The large and small holes are arranged sequentially in the direction facing the mounting post 112. When fixing the first resonant rod 120, a suitable bolt (not shown in the figure) can be selected and passed through the large and small holes of the second hole 121 in sequence, and finally screwed into the first hole 1121 with internal threads at the top of the mounting post 112. During this process, the bolt head or washer will firmly abut against the stepped surface, and a reliable fastening connection between the first resonant rod 120 and the mounting post 112 can be achieved by tightening the bolt.

[0038] In some embodiments, the end of the first resonant rod 120 away from the mounting post 112 has a circumferentially arranged extension, and the connection between the extension and the first resonant rod 120 is arc-shaped.

[0039] Please continue reading. Figure 3 As shown, the second hole 121 provided in the first resonant rod 120 can not only be installed on the mounting post 112 by bolts, but also its frequency can be adjusted by a corresponding adjusting rod inserted into the second hole 121 to meet different needs. Furthermore, the opening of the second hole 121 away from the mounting post 112 has circumferentially distributed extensions, and the extensions are arc-shaped transitions with the first resonant rod 120, thereby facilitating the insertion of the adjusting rod into the second hole 121.

[0040] When it is necessary to fine-tune the resonant frequency of the first resonant rod 120 to suit specific circuit requirements, a dedicated slender adjustment rod (not shown in the figure) can be inserted into the second hole 121 from the end opposite to the mounting post 112. The depth of the adjustment rod inserted into the hole directly affects the electromagnetic field distribution inside the first resonant rod 120, thereby altering its resonant characteristics and achieving precise frequency adjustment. This design avoids direct external contact with the resonant rod, making tuning operations more convenient and minimizing the impact on the internal environment of the cavity.

[0041] To significantly improve the smoothness and accuracy of the adjustment rod insertion operation, a circumferentially extending flange structure, or extension, is specially provided at the edge of the opening of the second hole 121. This extension surrounds the opening, and its root does not connect to the outer surface of the first resonant rod 120 body at a right angle, but rather through a carefully designed smooth arc surface. This arc transition structure effectively eliminates sharp edges, greatly reducing any resistance or friction that the adjustment rod may encounter during insertion, guiding the adjustment rod to more smoothly and accurately align and enter the central area of ​​the second hole 121, ensuring the efficiency and reliability of the frequency adjustment process.

[0042] In some embodiments, the second filter 200 includes a second housing 210 and a plurality of second resonant rods 220. The second housing 210 has a second cavity 211, which is connected to a first cavity 111. The second resonant rods 220 are disposed in the second cavity 211 and are connected to the first resonant rod 120 via a coupling line 300.

[0043] Please see Figure 1 and Figure 2 As shown, multiple second resonant rods 220 are spaced apart in the second cavity 211. The corresponding passband frequency is generated by the spacing between the multiple second resonant rods 220. Therefore, in order to meet the passband frequency requirements, the height of the second resonant rods 220 and the spacing between them can be designed by simulation software. The specific design process will not be described in detail here.

[0044] In this embodiment, the output terminal of the first filter 100 and the input terminal of the second filter 200 are connected by a coupling line 300, that is, the first resonant rod 120 and the second resonant rod 220 are connected by a coupling line 300.

[0045] In some embodiments, the cross-section of the second resonant rod 220 is circular or polygonal.

[0046] Regarding the shape of the second resonant rod 220, its radial cross-sectional shape can be circular, elliptical, triangular, rectangular, pentagonal, hexagonal, etc. In this embodiment, the cross-sectional shape of the second resonant rod 220 is circular, that is, the second resonant rod 220 is a cylinder. In practice, the shape of the second resonant rod 220 can be designed according to the working conditions, and is not limited here.

[0047] In some embodiments, the second housing 210 is integrally formed with the first housing 110, the first housing 110 is provided with a first cover that closes the first cavity 111, and the second housing 210 is provided with a second cover that closes the second cavity 211. The first cover and the second cover are integrally formed.

[0048] Please see Figure 1 and Figure 2As shown, the first cavity 111 and the second cavity 211 are connected to form a receiving cavity. The first cover and the second cover form a sealing cover. The first resonant rod 120 and the second resonant rod 220 are both located in the receiving cavity. In order to prevent the first resonant rod 120 and the second resonant rod 220 from being affected by the external environment, a sealing cover is provided at the opening of the receiving cavity to seal the first resonant rod 120 and the second resonant rod 220 in the receiving cavity. Furthermore, a sealing element is provided between the sealing cover and the first housing 110 and the second housing 210 to prevent external dust and other debris from entering the receiving cavity, thereby further protecting the first resonant rod 120 and the second resonant rod 220 inside.

[0049] It should be noted that when the adjustment rod needs to be inserted into the second hole 121 to achieve frequency adjustment, an avoidance hole corresponding to the position of the second hole 121 needs to be opened on the sealing cover, and the adjustment rod passes through the avoidance hole to be inserted into the second hole 121 to achieve adjustment.

[0050] In this embodiment, the sealing element used for sealing can be a sealing ring, such as an O-ring.

[0051] This embodiment also provides an electronic device that includes any of the filtering devices described above. That is, any use of the filtering device described in this embodiment is within the protection scope of this application.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A filtering device, characterized in that, include: A first filter (100) has an input terminal and an output terminal, and the first filter (100) has a first passband frequency; A second filter (200) is disposed at the input and / or output terminals, and the second filter (200) has a second passband frequency that covers the first passband frequency.

2. The filtering device of claim 1, wherein, The first filter (100) includes a first housing (110) and a plurality of first resonant rods (120). The first housing (110) has a first cavity (111), and the first resonant rods (120) are disposed in the first cavity (111).

3. The filtering device according to claim 2, characterized in that, The first resonant rod (120) has a circular cross-section.

4. The filtering device according to claim 2, characterized in that, The bottom wall of the first cavity (111) is provided with a mounting post (112), and the first resonant rod (120) is disposed on the mounting post (112).

5. The filtering device according to claim 4, characterized in that, The first resonant rod (120) has a second hole (121), the mounting post (112) has a first hole (1121), and the second hole (121) communicates with the first hole (1121).

6. The filtering device according to claim 4, characterized in that, The end of the first resonant rod (120) away from the mounting post (112) has a circumferentially arranged extension, and the extension is connected to the first resonant rod (120) with an arc transition.

7. The filtering device according to claim 2, characterized in that, The second filter (200) includes a second housing (210) and a plurality of second resonant rods (220). The second housing (210) has a second cavity (211) which is connected to the first cavity (111). The second resonant rods (220) are disposed in the second cavity (211) and are connected to the first resonant rods (120) through a coupling line (300).

8. The filtering device according to claim 7, characterized in that, The cross-section of the second resonant rod (220) is circular or polygonal.

9. The filtering device according to claim 7, characterized in that, The second housing (210) is integrally formed with the first housing (110). The first housing (110) is provided with a first cover that closes the first cavity (111), and the second housing (210) is provided with a second cover that closes the second cavity (211). The first cover and the second cover are integrally formed.

10. An electronic device, characterized in that, Includes the filtering device described in any one of claims 1 to 9.

Images