Metal cavity isolation wall structure of a multi-band combiner

Abstract

The utility model discloses a kind of metal cavity isolation wall structures of multi-band combiner, including metal cavity;Metal cavity, its inside is separated into two or more than two resonant cavities by at least one H-shaped isolation wall;Isolation wall is integrally formed by central vertical board and wing plate symmetrically arranged on the both sides of the vertical board;Central vertical board is provided with horizontal long circle through-hole, a rotatable coupling rod passes through the through-hole and extends into adjacent resonant cavity, realizes coupling amount adjustment;The outer surface of wing plate is covered with wave-absorbing coating, to absorb leakage electromagnetic wave and improve port isolation degree;By adopting the isolation wall design of the section of "H", the utility model significantly improves the isolation degree of multi-band combiner.Central vertical board and the three-dimensional structure formed by two side wing plates effectively block the leakage of high-frequency signal, so that the isolation degree between adjacent frequency bands reaches more than 60dB, meets the requirement of 5G communication to high isolation degree, improves the overall performance and reliability of system.

Description

Technical Field

[0001] This utility model relates to the field of combiner technology, specifically to a metal cavity isolation wall structure for a multi-band combiner. Background Technology

[0002] Patent publication number CN201708232U discloses a multi-frequency combiner, which includes: an outer wall panel and a cover plate fixed above the outer wall panel; the outer wall panel is provided with a partition for isolating five frequency band cavities; one side of the outer wall panel is equipped with signal input ports for the five frequency bands, and the other side is equipped with a combined signal output port. This multi-frequency combiner has a simple structure, low cost, can achieve five-frequency combining, and is easy to manufacture.

[0003] While the prior art achieves five-band combining, it still suffers from the following shortcomings: the partition is a simple, flat metal plate with uniform thickness and no surface absorbing treatment. As the operating frequency increases (≥3GHz), surface current diffraction becomes significant, resulting in port-to-port isolation of only 42–45dB, which is insufficient to meet the ≥60dB isolation requirement of the 5G NR 3.5GHz / 4.9GHz band; the top of the partition is in rigid contact with the cover plate, lacking an elastic grounding structure; after long-term temperature cycling, the gaps increase, further deteriorating the isolation; the coupling can only be discretely adjusted via the fixed coupling window between the oscillators and the cover plate tuning screw, making continuous and repeatable online adjustment of the cross-cavity coupling impossible; the lack of reinforcing ribs between the partition and the base plate results in low bending stiffness, and temperature-cycled deformation leads to significant resonant frequency drift. Therefore, the structure in the prior art still has significant deficiencies in terms of high-frequency band performance, high isolation, and online adjustable coupling in 5G, necessitating a metal cavity isolation wall structure for a multi-band combiner to meet these needs. Utility Model Content

[0004] The purpose of this invention is to provide a metal cavity isolation wall structure for a multi-band combiner to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a metal cavity isolation wall structure for a multi-band combiner, comprising a metal cavity; wherein the metal cavity is internally divided into two or more resonant cavities by at least one H-shaped isolation wall; The isolation wall is integrally formed from a central vertical plate and wing plates symmetrically arranged on both sides of the vertical plate; The central vertical plate has a horizontal elongated through hole, through which a rotatable coupling rod passes and extends into the adjacent resonant cavity to adjust the coupling amount. The outer surface of the wing plate is covered with a wave-absorbing coating to absorb leaked electromagnetic waves and improve port isolation.

[0006] Preferably, the top of the central vertical plate is provided with a threaded adjustment hole, into which a non-magnetic screw is screwed and abuts against the coupling rod.

[0007] Preferably, a continuous beryllium copper spring is slidably mounted on the wing plate, and the spring elastically abuts against the cover plate of the metal cavity.

[0008] Preferably, the beryllium copper spring has an "Ω" shaped folded structure with a compression of 0.3mm to 1.0mm to ensure good grounding even after long-term temperature cycling.

[0009] Preferably, an L-shaped reinforcing rib is welded between the central vertical plate and the bottom plate of the metal cavity to improve the rigidity of the cavity and suppress thermal deformation.

[0010] Preferably, the microwave absorbing coating is a carbonyl iron powder-silicone rubber composite layer with a thickness of 0.2 mm to 0.4 mm.

[0011] Preferably, the coupling rod is a cylindrical silver-plated brass rod with a flat indicator surface. The coupling amount can be continuously changed by rotating it from 0° to 90°, and it is locked in the threaded adjustment hole by a non-magnetic screw.

[0012] Compared with the prior art, the beneficial effects of this utility model are: (1) By adopting the “H”-shaped cross-section isolation wall design, this utility model significantly improves the isolation of the multi-band combiner. The three-dimensional structure formed by the central vertical plate and the two side wing plates effectively blocks the leakage of high-frequency signals, so that the isolation between adjacent frequency bands reaches more than 60dB, which meets the requirements of 5G communication for high isolation and improves the overall performance and reliability of the system.

[0013] (2) The isolation wall structure design in this utility model allows for online adjustment of the coupling amount, and continuous adjustable coupling within the range of 0dB to -10dB can be achieved by rotating the coupling rod. This design provides greater flexibility, enabling the combiner to adapt to different signal combinations and network configuration requirements, simplifying the debugging process, and improving the convenience of maintenance and upgrades. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the metal cavity isolation wall structure of a multi-band combiner proposed in this utility model; Figure 2 This is a cross-sectional structural diagram of the metal cavity isolation wall structure of a multi-band combiner proposed in this utility model; Figure 3 This is a schematic diagram of the structure of the metal cavity isolation wall and beryllium copper spring sheet of the multi-band combiner proposed in this utility model; Figure 4This is a schematic diagram of the internal structure of the metal cavity of a multi-band combiner with a metal cavity isolation wall structure proposed in this utility model.

[0015] In the diagram: 1. Metal cavity; 2. Isolation wall; 21. Central vertical plate; 22. Wing plate; 23. Elongated through hole; 24. Wave-absorbing coating; 25. Threaded adjustment hole; 3. Coupling rod; 4. Non-magnetic screw; 6. Beryllium copper spring; 5. L-shaped reinforcing rib. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example: Please refer to Figure 1-4 This utility model provides a technical solution: a metal cavity isolation wall structure for a multi-band combiner, including a metal cavity 1; the metal cavity 1 is divided into two or more resonant cavities by at least one H-shaped isolation wall 2; The isolation wall 2 is integrally formed from a central vertical plate 21 and wing plates 22 symmetrically arranged on both sides of the vertical plate; A horizontal elongated through hole 23 is opened in the central vertical plate 21. A rotatable coupling rod 3 passes through the through hole and extends into the adjacent resonant cavity to realize the adjustment of the coupling amount. The outer surface of the wing plate 22 is covered with a wave-absorbing coating 24 to absorb leaked electromagnetic waves and improve port isolation.

[0018] The metal cavity 1 consists of a housing and a cover, which are connected by threads. In this paper, four non-magnetic screws are threaded onto the cover, while all other parts are installed inside the housing.

[0019] To achieve effective isolation and coupling adjustment of signals from different frequency bands in a multi-band combiner, a threaded adjustment hole 25 is provided at the top of the central vertical plate 21. A non-magnetic screw 4 is screwed into this hole and abuts against the coupling rod 3. A continuous beryllium copper spring 6 is slidably installed on the wing plate 22. This spring elastically abuts against the cover plate of the metal cavity 1. The beryllium copper spring 6 has an "Ω" shaped folded structure with a compression of 0.3mm to 1.0mm to ensure good grounding even after long-term temperature cycling. The central vertical plate 21 and the metal cavity 1... L-shaped reinforcing ribs 5 are welded between the base plates to improve the rigidity of the cavity and suppress thermal deformation. The microwave absorbing coating 24 is a carbonyl iron powder-silicone rubber composite layer with a thickness of 0.2mm to 0.4mm. The coupling rod 3 is a cylindrical silver-plated brass rod with a flat indicator surface. The coupling amount can be continuously changed by rotating 0° to 90° and is locked in the threaded adjustment hole 25 by a non-magnetic screw 4. The "H"-shaped isolation wall 2 is vertically inserted into the pre-made groove of the metal cavity 1 and fixed by spot welding with the L-shaped reinforcing ribs 5. After the cover plate is pressed down, the beryllium copper spring sheet 6 on the wing plate 22 is compressed to achieve 360° radio frequency grounding between the cover plate, cavity and isolation wall, suppressing leakage.

[0020] The vertical plate 21 forms a metallic electrical shield, initially providing ≥45dB isolation. The absorbing coating 24 on the surface of the wing plate 22 absorbs residual high-order modes, increasing the port isolation from 3.5GHz to 4.9GHz to ≥68dB. The beryllium copper spring sheet 6 eliminates the gap in the cover plate, further reducing the surface current coupling path. The coupling rod 3 runs through the two cavities, and its flat surface rotation angle changes the effective overlap area with the adjacent resonant pillar. It is locked by a non-magnetic screw 4, achieving continuous adjustment from 0° to 90° to meet the online debugging requirements of different frequency band combinations.

[0021] The L-shaped reinforcing rib 5 increases the connection rigidity between the vertical plate 21 and the base plate, and after 1000 temperature cycles from -40℃ to +85℃, it meets the long-term reliable operation requirements of 5G outdoor poles.

[0022] The working principle is as follows: The "H"-shaped isolation wall 2 is vertically inserted into the pre-fabricated groove of the metal cavity 1 and fixed by spot welding with the L-shaped reinforcing rib 5. After the cover plate is pressed down, the beryllium copper spring 6 on the wing plate 22 is compressed, realizing 360° radio frequency grounding between the cover plate, cavity and isolation wall, and suppressing leakage.

[0023] The vertical plate 21 forms a metallic electrical shield, initially providing ≥45dB isolation. The absorbing coating 24 on the surface of the wing plate 22 absorbs residual high-order modes, increasing the port isolation from 3.5GHz to 4.9GHz to ≥68dB. The beryllium copper spring sheet 6 eliminates the gap in the cover plate, further reducing the surface current coupling path. The coupling rod 3 runs through the two cavities, and its flat surface rotation angle changes the effective overlap area with the adjacent resonant pillar. It is locked by a non-magnetic screw 4, achieving continuous adjustment from 0° to 90° to meet the online debugging requirements of different frequency band combinations.

[0024] The coupling rod 3 is similar to a "volume knob". When the flat indicator surface is completely parallel to the partition at 0°, the coupling rod 3 hardly blocks the signal. At this time, the coupling is the weakest and the reading is close to 0dB. When the flat indicator surface is rotated 90° and perpendicular to the partition, the flat surface produces the maximum "blocking and reflection" of the signal. At this time, the coupling is the strongest and the reading drops to -10dB. At any angle in between, the coupling amount changes continuously between 0dB and -10dB, just like the volume of a knob is different when it is turned to different positions.

[0025] The L-shaped reinforcing rib 5 increases the connection rigidity between the vertical plate 21 and the base plate, and after 1000 temperature cycles from -40℃ to +85℃, it meets the long-term reliable operation requirements of 5G outdoor poles.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal cavity isolation wall structure for a multi-band combiner, comprising a metal cavity (1); characterized in that: The metal cavity (1) is divided into two or more resonant cavities by at least one H-shaped isolation wall (2); The isolation wall (2) is integrally formed by a central vertical plate (21) and wing plates (22) symmetrically arranged on both sides of the vertical plate; The central vertical plate (21) has a horizontal elongated through hole (23), through which a rotatable coupling rod (3) passes and extends into the adjacent resonant cavity to achieve coupling adjustment; The outer surface of the wing plate (22) is covered with a wave-absorbing coating (24) to absorb leaked electromagnetic waves and improve port isolation.

2. The metal cavity isolation wall structure of a multi-band combiner according to claim 1, characterized in that: The top of the central vertical plate (21) is provided with a threaded adjustment hole (25), and a non-magnetic screw (4) is screwed into the hole and abuts against the coupling rod (3).

3. The metal cavity isolation wall structure of a multi-band combiner according to claim 2, characterized in that: A continuous beryllium copper spring sheet (6) is slidably mounted on the wing plate (22), and the spring sheet elastically abuts against the cover plate of the metal cavity (1).

4. The metal cavity isolation wall structure of a multi-band combiner according to claim 3, characterized in that: The beryllium copper spring (6) has an "Ω" shaped folded structure with a compression of 0.3mm to 1.0mm to ensure good grounding even after long-term temperature cycling.

5. The metal cavity isolation wall structure of a multi-band combiner according to claim 1, characterized in that: An L-shaped reinforcing rib (5) is welded between the central vertical plate (21) and the bottom plate of the metal cavity (1) to improve the rigidity of the cavity and suppress thermal deformation.

6. The metal cavity isolation wall structure of a multi-band combiner according to claim 1, characterized in that: The microwave absorbing coating (24) is a carbonyl iron powder-silicone rubber composite layer with a thickness of 0.2 mm to 0.4 mm.

7. The metal cavity isolation wall structure of a multi-band combiner according to claim 1, characterized in that: The coupling rod (3) is a cylindrical silver-plated brass rod with a flat indicator surface. The coupling amount can be continuously changed by rotating it from 0° to 90°, and it is locked in the threaded adjustment hole (25) by a non-magnetic screw (4).

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