Single cover cavity 3db bridge

Abstract

The present invention relates to a single-cover cavity 3db bridge, comprising a substrate with an unclosed cavity at the upper end, a cover plate which is arranged on the substrate and used to close the cavity, two input connectors are respectively installed at the left and right ends of the front side of the substrate, two output connectors are respectively installed at the left and right ends of the rear side of the substrate, two transmission rods are arranged in the cavity at intervals from top to bottom, one input connector is connected to one output connector via one transmission rod, and the other input connector is connected to the other output connector via another transmission rod, an insulating bracket is installed in the cavity, the transmission rod is supported by the insulating bracket, the input connector is connected to the output connector at the diagonal position thereof via the transmission rod, a debugging port is respectively opened on the cover plate above each transmission rod, an insulating medium debugging rod which is matched with the thread thereof is inserted in the debugging port, the bridge has a simple structure, good waterproof performance, and low manufacturing cost, only two debugging ports are arranged, production and debugging are simple and convenient, and consistency is excellent.

Description

Technical Field

[0001] The invention belongs to the technical field of mobile communications and relates to a single-cover cavity 3db bridge. Background Art

[0002] A bridge is a special passive device that can combine two input signals into two signals of equal amplitude and 90° phase difference. It has two input terminals, and the ratio of the through-port and the coupled-port is 1:1, so the power difference between the input and the output is 3dB. The 3dB bridge is used to combine the signals of the base station. From the effect point of view, it is equivalent to the combination of a combiner and a two-power splitter, also known as a "same-frequency combiner". The traditional waterproof bridge has a complex structure, and the joints are flanged, which is complicated to install. It requires a matching inner cover plate with multiple debugging ports, low production efficiency and high production material cost, and poor waterproof performance. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention proposes a single cover plate cavity 3db bridge.

[0004] The solution adopted by the present invention to solve the technical problem is a single-cover cavity 3db bridge, including a base with an unclosed cavity at the upper end, a cover plate arranged on the base to close the cavity, two input connectors are respectively installed at the left and right ends of the front side of the base, two output connectors are respectively installed at the left and right ends of the rear side of the base, two transmission rods are arranged in the cavity at intervals from top to bottom, one input connector is connected to one output connector via one transmission rod, and the other input connector is connected to the other output connector via another transmission rod, an insulating bracket is installed in the cavity, and the transmission rod is supported by the insulating bracket.

[0005] Furthermore, the input connector is connected to the output connector at its diagonal position via a transmission rod.

[0006] Furthermore, a debugging port is provided on the cover plate above each transmission rod, and an insulating medium debugging rod matched with the thread is passed through the debugging port.

[0007] Furthermore, an insulating support groove for supporting the end of the transmission rod is provided at the bottom of each joint side inside the cavity, and the end of the transmission rod is welded to the corresponding joint.

[0008] Furthermore, waterproof rings are provided between the input connector and the base, between the output connector and the base, and between the cover plate and the base, and annular grooves for installing waterproof rings are provided at the inner end of the input connector, the inner end of the output connector, and the top of the cavity.

[0009] Furthermore, the inner ends of the input connector and the output connector are provided with external threads, the base is provided with threaded holes for installing the input connector and the output connector, and the cover is fixed to the base by screws.

[0010] Furthermore, a copper layer is provided on the inner surface of the cavity and the lower surface of the cover plate, a silver layer is provided on the outer surface of the copper layer, and a silver layer is provided on the outer surface of the transmission rod. The thickness of the copper layer is greater than 3 μm, and the thickness of the silver layer is greater than 1 μm.

[0011] Furthermore, two outwardly extending isolation window portions are spaced apart along the length direction on the transmission rod.

[0012] Furthermore, the input end connector and the output end connector are both DIN type connectors, the cavity and the cover plate are both made of aluminum alloy, and the transmission rod is made of brass.

[0013] Furthermore, at least two insulating brackets are arranged in the cavity at intervals along the length direction, and a slot for plugging into the end of the insulating bracket is vertically opened on the inner wall of the cavity. The insulating bracket includes an upper plate, a partition plate, and a lower plate arranged from top to bottom, and the two transmission rods are separated by the partition plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: simple structure, good waterproof performance, low manufacturing cost, only two debugging ports are provided, production and debugging are simple and convenient, and consistency is excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings.

[0016] Figure 1 is the structural diagram of this bridge;

[0017] Figure 2 This is the exploded diagram of the structure of this bridge;

[0018] Figure 3 It is a structural diagram of the support frame;

[0019] Figure 4 This is a top view of the bridge after removing the cover plate;

[0020] Figure 5 Screenshot of the isolation test of the bridge;

[0021] Figure 6 These are screenshots of the insertion loss, standing wave, and fluctuation tests of this bridge.

[0022] In the figure: 1-base; 2-cover plate; 3-input end connector A; 4-input end connector B; 5-output end connector B; 6-output port connector A; 7-screw; 8-insulating medium debugging rod; 9-waterproof ring on the connector; 10-waterproof ring on the base; 11-transmission rod B; 12-transmission rod A; 13-insulating bracket; 13A-upper plate; 13B-partition plate; 13C-lower plate; 14-insulating support groove; 15-isolation window part. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figure 1-4 As shown, a single cover cavity 3db bridge comprises a substrate 1 with an open cavity at the upper end, a cover plate 2 which is arranged on the substrate to close the cavity, two input connectors 3 and 4 are respectively installed at the left and right ends of the front side of the substrate, and two output connectors 5 and 6 are respectively installed at the left and right ends of the rear side of the substrate, two transmission rods 11 and 12 of the same structure are arranged at intervals in the cavity, one input connector is connected to an output connector via a transmission rod, and the other input connector is connected to the other output connector via another transmission rod, an insulating bracket is installed in the cavity, and the transmission rods are supported by the insulating bracket 13 to prevent the two transmission rods from short-circuiting, waterproof rings 9 and 10 are arranged between the input connector and the substrate, between the output connector and the substrate, and between the cover plate and the substrate, the cover plate seals the inside of the cavity, and under the action of the waterproof ring, the waterproof performance of the inside of the cavity is good.

[0025] In this embodiment, the input connector is connected to the output connector at its diagonal position via a transmission rod.

[0026] In this embodiment, a debugging port is opened on the cover plate above each transmission rod, and an insulating medium debugging rod 8 that matches the thread is passed through the debugging port. By rotating the two insulating medium debugging rods, the product can be fine-tuned to achieve the required indicators.

[0027] In this embodiment, an insulating support groove 14 for supporting the end of the transmission rod is provided at the bottom of each joint side inside the cavity, and the end of the transmission rod is welded to the corresponding joint.

[0028] In this embodiment, the inner end of the input end connector, the inner end of the output end connector, and the top of the cavity are all provided with an annular groove for installing a waterproof ring.

[0029] In this embodiment, the inner ends of the input connector and the output connector are provided with external threads, the base is provided with threaded holes for installing the input connector and the output connector, and the cover plate is locked to the base by screws 7.

[0030] In this embodiment, a copper layer is provided on the inner surface of the cavity and the lower surface of the cover plate, a silver layer is provided on the outer surface of the copper layer, and a silver layer is provided on the outer surface of the transmission rod. The thickness of the copper layer is greater than 3 μm, and the thickness of the silver layer is greater than 1 μm.

[0031] In this embodiment, two isolation window portions 15 extending outward are arranged at intervals along the length direction on the transmission rod. By providing these two windows, a 3dB bridge simulation diagram is established through simulation software such as HFSS for result verification. It can be achieved that the isolation can reach the index requirement of ≥27dB in batches while ensuring that the insertion loss, fluctuation and standing wave meet the operator's index requirements. The actual product verification results are as follows: Figure 5 , Figure 6 shown.

[0032] In this embodiment, the input end connector and the output end connector are both DIN type connectors, the cavity and the cover plate are both made of aluminum alloy, and the transmission rod is made of brass.

[0033] In this embodiment, at least two insulating brackets are arranged at intervals along the length direction in the cavity, and a slot connected to the end of the insulating bracket is vertically opened on the inner wall of the cavity. The insulating bracket includes an upper plate 13A, a partition 13B, and a lower plate 13C arranged from top to bottom, and the two transmission rods are separated by the partition.

[0034] In this embodiment, the operating frequency of the 3db bridge is 800-3700MHz, which meets the operating frequency band requirements of 5G indoor construction of existing telecom, Unicom, Mobile and tower operators.

[0035] If this patent discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (such as connection using bolts or screws), or as: a non-detachable fixed connection (such as riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (such as one-piece manufacturing using a casting process) (except where it is obviously impossible to use an integrated molding process).

[0036] In the description of this patent, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0037] The preferred embodiments listed above further illustrate the objectives, technical solutions and advantages of the present invention in detail. It should be understood that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single cover cavity 3db bridge, characterized by: It comprises a base body with an unclosed cavity at the upper end, and a cover plate arranged on the base body to close the cavity, two input connectors are respectively installed at the left and right ends of the front side of the base body, and two output connectors are respectively installed at the left and right ends of the rear side of the base body, two transmission rods are arranged in the cavity at intervals, one input connector is connected to one output connector via one transmission rod, and the other input connector is connected to the other output connector via another transmission rod, and an insulating bracket is installed in the cavity, and the transmission rod is supported by the insulating bracket; The cover plate is provided with a debugging port above each transmission rod, and an insulating medium debugging rod matched with the thread thereof is inserted into the debugging port; Two outwardly extending isolation window portions are arranged at intervals on the transmission rod along the length direction; At least two insulating brackets are arranged in the cavity along the length direction, and a slot connected to the end of the insulating bracket is vertically opened on the inner wall of the cavity. The insulating bracket includes an upper plate, a partition plate, and a lower plate arranged from top to bottom, and the two transmission rods are separated by the partition plate.

2. The single cover cavity 3db bridge according to claim 1, characterized in that: The input connector is connected to the output connector at its diagonal position via a transmission rod.

3. The single cover cavity 3db bridge according to claim 1, characterized in that: The inside of the cavity is provided with an insulating support groove at the bottom of each joint side for supporting the end of the transmission rod, and the end of the transmission rod is welded to the corresponding joint.

4. The single cover cavity 3db bridge according to claim 1, characterized in that: Waterproof rings are arranged between the input connector and the base, between the output connector and the base, and between the cover plate and the base. The inner end of the input connector, the inner end of the output connector, and the top of the cavity are all provided with an annular groove for installing the waterproof ring.

5. The single cover cavity 3db bridge according to claim 4, characterized in that: The inner ends of the input connector and the output connector are provided with external threads, the base is provided with threaded holes for installing the input connector and the output connector, and the cover plate is fixed to the base by screws.

6. The single cover cavity 3db bridge according to claim 1, characterized in that: The inner surface of the cavity and the lower surface of the cover plate are both provided with a copper layer, the outer surface of the copper layer is provided with a silver layer, and the outer surface of the transmission rod is provided with a silver layer. The thickness of the copper layer is greater than 3μm, and the thickness of the silver layer is greater than 1μm.

7. The single cover cavity 3db bridge according to claim 1, characterized in that: The input connector and the output connector are both DIN type connectors, the cavity and the cover plate are both made of aluminum alloy, and the transmission rod is made of brass.

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