Frequency-division dual-channel filter

Abstract

The utility model belongs to the technical field of communication equipment, and particularly relates to a frequency division dual-channel filter, which comprises a cavity cover plate, a device cavity, a connector and a mounting bracket, the device cavity is of a hollow cuboid structure, and an opening is formed in the upper end face of the device cavity. The cavity cover plate is of a flat-plate-shaped structure matched with the opening and fixedly covers the opening in the upper end of the device cavity through evenly-distributed installation screws, and a sealed cavity is formed. According to the utility model, the large cavity design is adopted, and the insertion loss and standing-wave ratio index of a product are effectively improved, so that the transmission quality of communication signals is improved; two input ports and two output ports are arranged, so that when the device is connected with a dual-port device, the device can be connected through a jumper wire; the installation support is additionally designed, so that the product can be installed on a cabling rack, a cabinet or a platform, and installation and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of communication equipment technology, specifically to a frequency-divided dual-channel filter. Background Technology

[0002] With the development of the communications and rail transportation industries, the demand for customized communication equipment is increasing. Filters, as key components of radio frequency systems, require precise frequency selection. Existing single-channel filters, such as... Figure 1 As shown, the filter has the following drawbacks: First, it only filters signals outside the 885–960MHz range, failing to effectively eliminate interference signals between the uplink (885–889MHz) and downlink (930–934MHz) operating frequency bands. Second, its single-port input / output design requires pairing with dual-port devices, easily leading to misalignment and limitations. Third, its small cavity size results in poor insertion loss and VSWR, affecting the quality of communication signal transmission. Therefore, a structurally optimized filter is urgently needed to solve these problems. Utility Model Content

[0003] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of this section, the abstract, and the title, and such simplifications or omissions should not be used to limit the scope of this utility model.

[0004] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0005] A frequency-division dual-channel filter includes a cavity cover, a device cavity, a connector, and a mounting bracket; the device cavity has a hollow cuboid structure with an opening on its upper end face;

[0006] The cavity cover is a flat plate structure that matches the opening. It is fixed to the upper opening of the device cavity by evenly distributed mounting screws to form a sealed cavity.

[0007] The connector includes a first connector and a second connector, which are symmetrically mounted on the middle of the left and right side walls of the device cavity, and the axes of both are perpendicular to the length direction of the device cavity.

[0008] The mounting bracket is an "L"-shaped plate structure. Its horizontal section is fixed to the middle of the lower end face of the device cavity by welding, and the vertical section is provided with multiple evenly distributed mounting holes.

[0009] Both the first connector and the second connector include an input port and an output port, and the input port and the output port are diagonally distributed on both sides of the device cavity.

[0010] As a preferred embodiment of the frequency-divided dual-channel filter described in this utility model, the device cavity is provided with a frequency-divided filtering structure, the frequency-divided filtering structure includes a first filter plate and a second filter plate arranged in parallel vertically, and the first filter plate and the second filter plate are respectively fixed to the inner sidewall of the device cavity by support columns.

[0011] In a preferred embodiment of the frequency-divided dual-channel filter described in this utility model, the width and height of the device cavity are matched with the width and height of the cavity cover plate, respectively, and the thickness of the left and right side walls of the device cavity is greater than or equal to 5mm.

[0012] As a preferred embodiment of the frequency-divided dual-channel filter described in this utility model, the input port and output port of the first connector are located at the upper and lower parts of the left side wall of the device cavity, respectively, and the input port and output port of the second connector are located at the lower and upper parts of the right side wall of the device cavity, respectively, forming a cross-symmetrical dual-input dual-output structure.

[0013] In a preferred embodiment of the frequency-divided dual-channel filter described in this utility model, the input port and output port of the connector are both female interfaces, the outer side of the female interface is provided with a threaded connection part, and the axis of the threaded connection part coincides with the axis of the connector.

[0014] In a preferred embodiment of the frequency-divided dual-channel filter described in this utility model, the vertical section height of the mounting bracket is greater than or equal to 1 / 3 of the height of the device cavity, the diameter of the mounting hole matches that of a standard M4 screw, and the horizontal section length of the mounting bracket is equal to the width of the device cavity.

[0015] As a preferred embodiment of the frequency-division dual-channel filter described in this utility model, the lower end face edge of the cavity cover is provided with an annular sealing groove, a rubber sealing ring is embedded in the sealing groove, the outer diameter of the rubber sealing ring matches the groove width of the sealing groove, and the cavity cover forms a waterproof and dustproof sealing structure with the device cavity through the sealing ring.

[0016] Compared with the prior art, the beneficial effects of this utility model are: the large cavity design effectively improves the insertion loss and VSWR of the product, thereby improving the transmission quality of communication signals; it has two input ports and two output ports, and can be connected to dual-port devices by means of jumpers; the addition of a mounting bracket design allows the product to be installed on cable trays, cabinets, or platforms, facilitating installation and maintenance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0018] Figure 1 This is a schematic diagram of the structure of an existing single-channel filter;

[0019] Figure 2 This is a schematic diagram of the structure of this utility model;

[0020] Figure 3 This utility model Figure 2 A schematic diagram of the structure from a side view;

[0021] Figure 4 This is a top view of the structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of this utility model from the front view. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0027] Please see Figures 2-5 The diagram shown is a structural schematic of a frequency-divided dual-channel filter embodiment of this utility model. Please refer to [link / reference]. Figures 2-5 This paper provides a detailed introduction to a frequency-divided dual-channel filter.

[0028] A frequency-division dual-channel filter includes a cavity cover plate 1, a device cavity 2, a connector 3, and a mounting bracket 4. The rectangular hollow structure of the device cavity 2 provides installation space for internal components, and the upper opening is sealed by the cavity cover plate 1. The evenly distributed mounting screws ensure sealing stability. The connector 3 is symmetrically installed in the middle of the two side walls, facilitating symmetrical connection of dual-port devices. The diagonal distribution design of the input and output ports avoids mutual interference during signal transmission. The "L"-shaped structure of the mounting bracket 4 allows the filter to be fixed to cable trays, cabinets, or platforms through mounting holes, meeting the installation requirements of different scenarios and significantly improving the convenience of installation and maintenance.

[0029] Furthermore, the frequency division filtering structure within the device cavity 2 precisely filters the uplink and downlink frequency bands using a first filter plate and a second filter plate, respectively. The first filter plate corresponds to the uplink operating frequency band of 885–889 MHz, and the second filter plate corresponds to the downlink operating frequency band of 930–934 MHz. The first filter plate only allows signals from the 885–889 MHz band to pass through, while the second filter plate only allows signals from the 930–934 MHz band to pass through. Both are fixed by support pillars to ensure the positional accuracy of the filter plates. This design can effectively block interference signals outside the frequency band, significantly improving signal purity compared to existing single-channel filters and solving the technical problem of inter-frequency band interference.

[0030] Furthermore, the device cavity 2 adopts an enlarged size design, with an inner cavity length greater than 1.5 times that of existing products and a side wall thickness increased to more than 5mm; the larger cavity space reduces electromagnetic coupling interference of internal components and reduces insertion loss of signal transmission; the thickened side walls enhance the structural strength of the cavity, reduce signal reflection, and improve the standing wave ratio.

[0031] Furthermore, the input and output ports of connector 3 adopt a cross-symmetrical design, with the upper left side being the input port and the lower left side being the output port, and the lower right side being the input port and the upper right side being the output port. This structure is perfectly matched with the "one main and one backup" design of dual-port devices. Dual-channel signal transmission can be achieved by directly connecting via jumpers, avoiding the drawback of existing single-channel filters needing to be installed in pairs, reducing installation time, and improving connection stability.

[0032] Furthermore, the female connector of connector 3, in conjunction with the threaded connection part, can be directly connected to jumpers with male connectors without the need for additional adapters; the threaded connection ensures a tight connection, reduces signal contact loss, and facilitates quick insertion and removal, improving installation efficiency.

[0033] Furthermore, the vertical section of the mounting bracket 4 is designed to be more than 1 / 3 of the cavity height to ensure sufficient support strength; the mounting holes are matched with standard M4 screws, compatible with mainstream mounting accessories; the horizontal section is designed to be the same width as the cavity, so that the center of gravity of the filter is centered, significantly improving stability after installation, adapting to reliable fixation in vibration environments, and expanding application scenarios.

[0034] Furthermore, the sealing groove of the cavity cover plate 1 is inlaid with a rubber sealing ring to form a physical sealing barrier, extend the service life of the components, and improve the reliability of the product in outdoor or high humidity environments.

[0035] This filter features a dual-channel structure, allowing the left input port to be directly connected to BTS0 and the right input port to BTS1 via jumpers. The output ports are connected to the load terminals ANT0 and ANT1, respectively. Compared to existing single-channel filters that require pair installation, this embodiment only requires a single filter to complete the connection of dual-port devices, reducing device space occupation and installation complexity. At the same time, through frequency division filtering and a large cavity design, it ensures the pure transmission of uplink and downlink signals, improving the overall system performance.

[0036] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A frequency-division dual-channel filter, comprising a cavity cover (1), a device cavity (2), a connector (3), and a mounting bracket (4), characterized in that: The device cavity (2) has a hollow cuboid structure with an opening on its upper end face; The cavity cover plate (1) is a flat plate structure that matches the opening. It is fixed to the upper opening of the device cavity (2) by evenly distributed mounting screws to form a sealed cavity. The connector (3) includes a first connector and a second connector. The first connector and the second connector are respectively symmetrically installed on the middle of the left and right side walls of the device cavity (2), and the axes of both are perpendicular to the length direction of the device cavity (2). The mounting bracket (4) is an "L"-shaped plate structure. Its horizontal section is fixed to the middle of the lower end face of the device cavity (2) by welding, and the vertical section is provided with multiple evenly distributed mounting holes. Both the first connector and the second connector include an input port and an output port, and the input port and the output port are diagonally distributed on both sides of the device cavity (2).

2. The frequency-divided dual-channel filter according to claim 1, characterized in that, The device cavity (2) is provided with a frequency division filtering structure. The frequency division filtering structure includes a first filter plate and a second filter plate arranged in parallel at the top and bottom. The first filter plate and the second filter plate are respectively fixed to the inner side wall of the device cavity (2) by support columns.

3. A frequency-divided dual-channel filter according to claim 1, characterized in that, The width and height of the device cavity (2) are matched with the width and height of the cavity cover (1), and the thickness of the left and right side walls of the device cavity (2) is greater than or equal to 5 mm.

4. A frequency-divided dual-channel filter according to claim 1, characterized in that, The input port and output port of the first connector are located on the upper and lower parts of the left side wall of the device cavity (2), respectively, and the input port and output port of the second connector are located on the lower and upper parts of the right side wall of the device cavity (2), respectively, forming a cross-symmetrical dual-input dual-output structure.

5. A frequency-divided dual-channel filter according to claim 1, characterized in that, The input port and output port of the connector (3) are both female interfaces. The outer side of the female interface is provided with a threaded connection part, and the axis of the threaded connection part coincides with the axis of the connector (3).

6. A frequency-divided dual-channel filter according to claim 1, characterized in that, The vertical section height of the mounting bracket (4) is greater than or equal to 1 / 3 of the height of the device cavity (2), and the diameter of the mounting hole matches that of a standard M4 screw. The horizontal section length of the mounting bracket (4) is equal to the width of the device cavity (2).

7. A frequency-divided dual-channel filter according to claim 1, characterized in that, The lower end face edge of the cavity cover plate (1) is provided with an annular sealing groove, and a rubber sealing ring is embedded in the sealing groove. The outer diameter of the rubber sealing ring matches the groove width of the sealing groove, and the cavity cover plate (1) forms a waterproof and dustproof sealing structure with the device cavity (2) through the sealing ring.

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