5G high power low intermodulation broadband load

Abstract

The application discloses a 5G high-power low-intermodulation broadband load, which comprises a shell, a coaxial cable and a connector, wherein a cavity is defined in the shell. The coaxial cable is coiled in the cavity and connected with the connector at one end, and the coaxial cable is used for transmitting and absorbing incident power. The connector is used for receiving external incident power, and the connector comprises a connecting head and an adapter head which are coaxially arranged. The connecting head penetrates through the shell and is fixedly connected with the shell, and the end of the connecting head located in the cavity is connected with the adapter head. The cable inner core of the coaxial cable penetrates through the adapter head and is fixedly welded with the connecting head, and the tin-dipped braided layer of the coaxial cable is fixedly welded with the adapter head. The connection between the connector and the coaxial cable is stable, and the third-order intermodulation index of the load can have good performance in each frequency band.

Description

Technical Field

[0001] This invention relates to the field of mobile communication equipment technology, and in particular to a 5G high-power low-intermodulation broadband load. Background Technology

[0002] With the rapid development of 5G mobile communication, the number and power of carriers in communication systems are constantly increasing, and the requirements for intermodulation of equipment are also becoming more stringent. As a power absorption device in communication systems, low intermodulation loads are becoming increasingly important. Among the common low intermodulation loads, one type is the cable winding load, which achieves its load characteristics through the natural fading of the cable; the other type is the resistive load, in which resistive materials are placed in the radio frequency circuit structure of different frequency bands to form a load at the corresponding frequency.

[0003] For common cable-wound loads, one end of the cable is typically connected to a connector, which then connects to an external communication system. Traditional load designs involve directly soldering the cable to the connector. The connector usually consists of a shell and a cable core; the cable core is soldered to the cable and then crimped onto the connector shell. However, because connectors operate in low-temperature, humid environments with high salt content, a ternary alloy plating layer is typically formed on the connector surface to ensure a good appearance, prevent oxidation, and meet salt spray testing requirements. However, when soldering the cable to a connector with this ternary alloy plating layer, insufficient soldering and weak welds can occur, ultimately leading to poor third-order intermodulation performance and affecting the load's performance. Summary of the Invention

[0004] To overcome the above-mentioned shortcomings, the purpose of this invention is to provide a 5G high-power low intermodulation broadband load with stable connector and coaxial cable connection, ensuring that the load's third-order intermodulation index performs well in all frequency bands.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a 5G high-power low-intermodulation broadband load, comprising a housing, a coaxial cable, and a connector, wherein a cavity is defined within the housing; the coaxial cable is coiled within the cavity, and one end is connected to the connector, the coaxial cable being used to transmit and absorb incident power; the connector being used to receive external incident power, the connector comprising a coaxially arranged connector head and an adapter, the connector head passing through the housing and being fixedly connected to the housing, and the end of the connector head located within the cavity being connected to the adapter, the inner core of the coaxial cable passing through the adapter and being welded and fixed to the connector head, and the tin-plated braided layer of the coaxial cable being welded and fixed to the adapter.

[0006] The beneficial effects of this invention are as follows: the split connector and adapter are welded to the inner core of the cable and the adapter is welded to the tin-plated braided layer, ensuring stable connection and guaranteeing good performance of the third-order intermodulation index in all frequency bands.

[0007] Furthermore, the welded portions of the connector and the cable core, as well as the welded portions of the adapter and the tin-plated braided layer, are all plated with silver by electroplating. The silver plating at both weld points allows for sufficient tin melting, improving weld stability.

[0008] Furthermore, the connector includes an integrally formed inner core and outer shell. The inner core is disposed within the outer shell and coaxially arranged with it. The outer shell is fixed to the housing. A gap is left between the inner core and the inner wall of the outer shell. The inner core and the cable core are welded together. The connector adopts an integral structure composed of the inner core and the outer shell. The outer shell and the housing are fixed to achieve sufficient grounding. Power transmission is achieved by fixing the inner core to the cable core.

[0009] Furthermore, the connector inner core includes an inner connecting part located inside the cavity. The inner connecting part has a fixing groove at its end near the adapter for inserting the cable inner core. The cable inner core is inserted into the fixing groove and welded and fixed within it. The fixing groove not only fixes the cable inner core but also increases the contact area with the cable inner core, ensuring power transmission. The inner connecting part also has a solder inlet that communicates with the fixing groove, through which solder is introduced for welding.

[0010] Furthermore, the adapter includes a connecting part and a welding part that are connected sequentially and coaxially. The connecting part is sleeved outside the connecting head and threadedly connected to it, allowing for quick installation and removal of the adapter. The welding part has a channel for the coaxial cable to pass through, and the welding part is welded to the tin-plated braided layer. The connecting part has a protective cavity communicating with the channel. The protective cavity effectively protects the coaxial cable, preventing breakage due to rotation.

[0011] Furthermore, the outer wall of the connecting part has a polygonal structure, preferably hexagonal, to facilitate rotation of the connecting part from various angles.

[0012] Furthermore, a low intermodulation (LIMO) plate load is soldered and fixed to the other end of the coaxial cable, and the LIMO plate load is grounded. The LIMO plate load is used to absorb power. Its operating frequency is DC-6 (GHz). Using this LIMO plate load effectively absorbs signals that cannot be attenuated by the coaxial cable, ensuring that the load's operating frequency band starts from 0Hz, thus expanding the operating bandwidth. Simultaneously, because the LIMO plate load can absorb some power, it also avoids the need for multiple coils of coaxial cable, saving space and reducing costs.

[0013] Furthermore, a winding post and a cable baffle are fixed inside the cavity. The winding post is fixed to the bottom plate of the housing, and the cable baffle is fixed to the upper end face of the winding post. The coaxial cable is coiled on the winding post and located between the bottom plate and the cable baffle. The winding post and cable baffle are designed to facilitate the coiling of the coaxial cable.

[0014] Furthermore, it also includes a heat dissipation device, which comprises an upper heat sink and a lower heat sink. The upper heat sink is fixed to the upper opening of the housing, and the lower heat sink is fixed to the lower end face of the housing and abuts against the bottom plate of the housing. The two heat sinks dissipate heat from the upper and lower sides, ensuring heat dissipation for the load during long-term operation.

[0015] Furthermore, a second sealing ring is provided between the upper heat sink and the housing to seal their connection, and a first sealing ring is provided between the connector and the housing to seal their connection. Sealing rings are provided at all openings of the housing. The first and second sealing rings improve the load's water resistance, preventing moisture from entering the load during use and affecting its operation. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0017] Figure 2 This is a cross-sectional view of an embodiment of the present invention;

[0018] Figure 3 This is an exploded view of an embodiment of the present invention;

[0019] Figure 4 This is a cross-sectional view of the connection state between the connector and the coaxial cable in an embodiment of the present invention;

[0020] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0021] Figure 6 This is a three-dimensional structural diagram of the connector in an embodiment of the present invention;

[0022] Figure 7 This is a cross-sectional view of the connector in an embodiment of the present invention;

[0023] Figure 8 This is a three-dimensional structural diagram of the adapter in an embodiment of the present invention;

[0024] Figure 9 This is a cross-sectional view of the adapter in an embodiment of the present invention;

[0025] Figure 10 This is a three-dimensional structural diagram of the coaxial cable in an embodiment of the present invention.

[0026] In the picture:

[0027] 1. Housing; 11. Cavity; 2. Coaxial cable; 21. Cable core; 22. Tin-plated braided layer; 23. Dielectric layer; 3. Connector; 31. Connector head; 311. Connector core; 3111. Inner connection part; 3111a. Fixing groove; 3111b. Soldering port one; 3112. Outer connection part; 312. Housing; 3121. Connecting plate; 32. Adapter; 321. Connection part; 3211. Protective cavity; 322. Soldering part; 3221. Channel; 3222. Soldering port two; 4. Low intermodulation plate load; 5. Winding post; 6. Cable baffle; 61. Cable clearance groove; 71. Upper heat sink; 72. Lower heat sink; 81. Second sealing ring; 82. First sealing ring. Detailed Implementation

[0028] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0029] See appendix Figure 1 As shown, a 5G high-power low-intermodulation broadband load of the present invention includes a housing 1, a coaxial cable 2, and a connector 3. A cavity 11 is defined within the housing 1, and the coaxial cable 2 is coiled within the cavity 11, with one end connected to the connector 3. The coaxial cable 2 is used for transmitting and absorbing incident power. The coaxial cable 2 is an RG-402 RF cable. The connector 3 passes through the housing 1 and is fixedly connected to it. The connector 3 is used to receive external incident power.

[0030] See appendix Figure 3 As shown, the housing 1 includes an integrally formed bottom plate and side wall, and a cavity 11 is defined between the bottom plate and the side plate. The connector 3 is fixed on a side wall, and a through hole is provided on the side wall for the connector to pass through.

[0031] See attached document Figure 10 As shown, the coaxial cable 2 includes a cable core 21, a dielectric layer 23, and a tin-impregnated braided layer 22 arranged coaxially from the inside out. To facilitate the connection of the coaxial cable 2, the coaxial cable 2 is cut so that the end of the dielectric layer 23 extends out of the tin-impregnated braided layer 22, and the end of the cable core 21 extends out of the dielectric layer 23. The cable core 21, dielectric layer 23, and tin-impregnated braided layer 22 form a stepped structure.

[0032] See attached document Figure 2 and 4As shown, connector 3 includes a coaxially arranged connector head 31 and adapter 32, both made of brass, and detachably connected. Connector head 31 passes through housing 1, and its end located within cavity 11 connects to adapter 32. Adapter 32 has a channel 3221 for the coaxial cable 2 to pass through. The inner core 21 of the coaxial cable 2 passes through channel 3221 and is soldered to connector head 31. The tin-plated braided layer 22 of the coaxial cable 2 is also soldered to adapter 32. The portions of connector head 31 and adapter 32 soldered to the inner core 21 and tin-plated braided layer 22, respectively, are electroplated with silver to form a silver plating layer. This silver plating layer allows for sufficient tin melting, improving the stability of the coaxial cable 2 soldering and ensuring good performance of third-order intermodulation characteristics across all frequency bands.

[0033] See attached document Figure 6 and 7 As shown, the connector 31 includes an integrally formed connector inner core 311 and a housing 312. The connector inner core 311 is disposed inside the housing 312 and is coaxially arranged with the housing 312. The housing 312 is fixed to the housing 1. Since the housing 1 is grounded, the housing 1 fixed to the housing 312 is also fully grounded. The connector inner core 311 and the cable inner core 21 are welded together.

[0034] The connector core 311 includes an inner connecting part 3111 located inside the cavity 11 and an outer connecting part 3112 located outside the cavity 11. The inner connecting part 3111 is welded to the cable core 21, and the outer connecting part 3112 is connected to external equipment. Gaps are left between the outer walls of both the inner connecting part 3111 and the outer connecting part 3112 and the inner wall of the outer casing 312. A fixing part is fixed inside the outer casing 312, and the inner connecting part 3111 and the outer connecting part 3112 are respectively fixed on both sides of the fixing part.

[0035] See appendix Figure 7 As shown, one end of the inner connecting part 3111 is fixed to the outer shell 312, and the other end extends out of the outer shell 312. The inner connecting part 3111 extending out of the outer shell 312 has a fixing groove 3111a at its end for inserting the cable inner core 21. See attached drawing. Figure 5 As shown, the cable core 21 is inserted into and welded to the fixing groove 3111a. The inner connecting part 3111 extends out of the housing 1 to facilitate welding of the cable core 21. The inner connecting part 3111 has a solder inlet 3111b that communicates with the fixing groove 3111a. Solder is introduced through the solder inlet 3111b to facilitate welding of the inner connecting part 3111 and the cable core 21. A silver plating layer is electroplated on the surface of the inner connecting part 3111.

[0036] The diameter of the fixing groove 3111a is smaller than the outer diameter of the dielectric layer 23, and the end of the dielectric layer 23 can abut against the end of the inner connection part 3111. Insert the inner core 21 of the cable into the fixing groove 3111a. When the end of the dielectric layer 23 abuts against the inner connection part 3111, it means that it is inserted in place and soldering can begin.

[0037] See attached document Figure 8 As shown, the adapter 32 includes a connecting part 321 and a welding part 322 that are connected sequentially and coaxially. The connecting part 321 is sleeved on the outer shell and connected to the connector 31. A channel 3221 is formed inside the welding part 322, and a protective cavity 3211 communicating with the channel 3221 is formed on the connecting part 321. The end of the inner connecting part 3111 can extend into the protective cavity 3211. The protective cavity 3211 can protect the inner core 21 of the cable located therein.

[0038] See appendix Figure 5 and 9 As shown, the tin-plated braided layer 22 is soldered to the soldering part 322, and the silver plating layer is electroplated on the surface of the soldering part 322. The soldering part 322 has a second solder inlet 3222 that communicates with the channel 3221. Solder is introduced from the second solder inlet 3222 to facilitate the soldering of the inner connection part 3111 and the inner core 21 of the cable.

[0039] To facilitate quick assembly and disassembly of the adapter 32 and the connector 31, the connector 31 and the adapter 32 are connected by threads. The connecting part 321 is provided with internal threads, and the outer shell 312 located inside the cavity 11 is provided with external threads that match the internal threads.

[0040] During assembly, the coaxial cable 2 and its connector 31 are fixed to the housing 1 to ground the connector 31. After the coaxial cable 2 is coiled around the cavity 11, it passes through the adapter 32, and the inner core 21 of the cable is welded to the inner connecting part 3111 of the connector 31. Then, the adapter 32 is rotated to fix it to the connector 31, ensuring that the adapter 32, connector 31, and housing 312 are grounded completely. Finally, the tin-plated braided layer 22 is welded to the soldering part 322 of the adapter 32. Since both the soldering part 322 and the inner connecting part 3111 are silver-plated, the solder is fully melted, improving the third-order intermodulation index and ensuring that the third-order intermodulation of the entire load is <-165dBc (2*43dB), the voltage standing wave is <1.2, and the power reaches 200W. Meanwhile, the dielectric layer 23 extending from the tin-plated braided layer 22 is located inside the protective cavity 3211, and the inner core 21 extending from the dielectric layer 23 is located inside the fixing groove 3111a, which effectively protects the inner core 21 of the cable, prevents it from breaking, and improves its stability.

[0041] In one embodiment, to facilitate rotation of the adapter 32 and achieve a quick threaded connection between the adapter 32 and the connector 31, the outer wall of the connector 321 is a polygonal structure, such as a triangle, quadrilateral, or hexagon, to facilitate hand gripping and rotation of the connector 31 from multiple angles. See Appendix. Figure 8 As shown, the outer wall of the connecting part 321 is hexagonal, which facilitates the application of force from multiple angles and the rotation of the adapter 32.

[0042] In one embodiment, in order to limit the distance between the adapter 32 and the connector 31, a protruding ring is provided on the inner wall of the connecting part 321. When the protruding ring abuts against the end of the housing 312, the adapter 32 can no longer be rotated, indicating that the adapter 32 has been rotated into place and the assembly with the connector 31 is completed.

[0043] In one embodiment, see Appendix Figure 6 As shown, a connecting plate 3121 is provided circumferentially on the outer wall of the outer casing 312. The connecting plate 3121 abuts against the casing 1 and is fixedly connected to the casing 1 by bolts. To improve the waterproof effect, a first sealing ring 82 is also provided between the connecting plate 3121 and the casing 1. A first embedding groove is provided on the connecting plate 3121 for the first sealing ring 82 to be inserted. The first sealing ring 82 is arranged around the through hole to achieve a seal between the connector 3 and the casing 1.

[0044] In one embodiment, see Appendix Figure 2 and 3 As shown, the other end of the coaxial cable 2 is also connected to a low intermodulation (LIMO) plate load 4. The LIMO plate load 4 is soldered and fixed to the coaxial cable 2, and the LIMO plate load 4 is grounded. To achieve grounding of the LIMO plate load 4, it is only necessary to connect the LIMO plate load 4 to the grounded housing 1. The operating frequency of the LIMO plate load 4 is DC-6 (GHz). Using this LIMO plate load 4 can effectively absorb signals that cannot be attenuated by the coaxial cable 2, ensuring that the operating frequency band of this load starts from 0Hz, thus expanding the operating frequency bandwidth. At the same time, since the LIMO plate load 4 can absorb some power, it also avoids the need for multiple coils of the coaxial cable 2, saving space and reducing costs.

[0045] Inside the housing 1, there is also a winding post 5, which is fixed at the center of the cavity 11. The coaxial cable 2 is coiled on the winding post 5, which makes it easy for the coaxial cable 2 to be quickly fixed inside the cavity 11.

[0046] The winding post 5 is fixedly connected to the base plate by bolts. The winding post 5 is made of aluminum, which facilitates heat conduction and directs the heat generated by the coaxial cable 2 into the housing 1 for heat dissipation.

[0047] See appendix Figure 1 and 3As shown, an upper heat sink 71 is fixed to the upper opening of the housing 1. The upper heat sink 71 covers the opening and is fixedly connected to the side wall of the housing 1 by bolts. The upper heat sink 71 is used for heat dissipation and includes a horizontal plate fixedly connected to the housing 1 and several heat dissipation fins fixedly connected to the horizontal plate. The heat dissipation fins are vertically arranged on the horizontal plate, and the multiple heat dissipation fins are arranged parallel and spaced apart. The upper heat sink 71 can quickly dissipate the heat generated inside the housing 1.

[0048] A second sealing ring 81 is provided between the heat sink and the housing 1 to seal the connection between the two, which improves the waterproof performance of the load. A second embedding groove is provided on the upper end face of the side wall for the second sealing ring 81 to be embedded.

[0049] See appendix Figure 2 and 3 As shown, a cable baffle 6 is also fixed at the upper end of the winding post 5, located above the coaxial cable 2. The cable baffle 6 abuts against the horizontal plate of the upper heat sink 71. The cable baffle 6 serves two purposes: firstly, it limits the coaxial cable 2, confining it between the cable baffle 6 and the base plate; secondly, it facilitates heat conduction, transferring the heat generated by the coaxial cable 2 to the upper heat sink 71 for rapid heat dissipation.

[0050] See attached document Figure 3 As shown, the cable baffle 6 is also provided with a cable clearance groove 61, from which the coaxial cable 2 extends and connects.

[0051] In one embodiment, to facilitate the fixing of the low intermodulation plate load 4, the low intermodulation plate load 4 can also be fixed on the cable baffle 6. That is, after the coaxial cable is wound along the winding post 5, the low intermodulation plate load 4 is directly fixed on the cable baffle 6, and then the cable baffle 6 is fixed on the winding post 5, achieving rapid conversion. Since the cable baffle 6 is connected to the housing 1 through the winding post 5, the cable baffle 6 is also grounded at this time, that is, the low intermodulation plate load 4 is also grounded.

[0052] In one embodiment, a lower heat sink 72 is also fixed to the lower end of the housing 1. The structure of the lower heat sink 72 is the same as that of the upper heat sink 71, which dissipates heat from the upper and lower sides of the housing 1 to ensure heat dissipation of the load during long-term operation.

[0053] This load uses a split connector 31 and adapter 32, which can be quickly disassembled. Connector 31 is welded to the cable core, and adapter 32 is welded to the tin-plated braided layer 22. Both welds are electroplated with silver to form a silver plating layer, which allows for sufficient tin melting and ensures good performance of the third-order intermodulation index across all frequency bands.

[0054] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A 5G high-power low-intermodulation broadband load, comprising a housing, a coaxial cable, and a connector, characterized in that: in A cavity is defined within the housing; The coaxial cable is coiled inside the cavity, with one end connected to a connector. The coaxial cable is used to transmit and absorb incident power. The connector is used to receive external incident power. The connector includes a coaxially arranged connector head and an adapter. The connector head passes through the housing and is fixedly connected to the housing. The end of the connector head located inside the cavity is connected to the adapter. The inner core of the coaxial cable passes through the adapter and is welded and fixed to the connector head. The tin-impregnated braided layer of the coaxial cable is welded and fixed to the adapter head. The connector includes an integrally formed inner core and outer shell. The inner core includes an inner connecting part located inside the cavity. One end of the inner connecting part extends out of the outer shell. The inner connecting part has a fixing groove for inserting the cable inner core from its end near the adapter. The cable inner core is inserted into the fixing groove and welded and fixed in the fixing groove. The inner connecting part has a soldering port that communicates with the fixing groove. The adapter includes a connecting part and a welding part that are connected in sequence and coaxially arranged. The welding part has a channel for the coaxial cable to pass through, and the welding part has a soldering port that communicates with the channel.

2. The 5G high-power low-intermodulation broadband load according to claim 1, characterized in that: The welded portions of the connector and the cable core, and the welded portions of the adapter and the tin-plated braided layer, are all plated with silver by electroplating.

3. The 5G high-power low-intermodulation broadband load according to claim 1, characterized in that: The connector inner core is disposed inside the outer shell and is coaxially arranged with the outer shell. The outer shell is fixed on the housing. A gap is left between the connector inner core and the inner wall of the outer shell. The connector inner core and the cable inner core are welded together.

4. The 5G high-power low-intermodulation broadband load according to claim 1, characterized in that: The connecting part is sleeved outside the connecting part and threadedly connected to the connecting head, and the welding part is welded to the tin-plated braided layer. A protective cavity communicating with the channel is opened on the connecting part.

5. The 5G high-power low-intermodulation broadband load according to claim 4, characterized in that: The outer wall of the connecting part has a polygonal structure.

6. The 5G high-power low-intermodulation broadband load according to any one of claims 1-5, characterized in that: The other end of the coaxial cable is welded and fixed with a low intermodulation plate load, which is grounded.

7. The 5G high-power low-intermodulation broadband load according to claim 1, characterized in that: The cavity also contains a winding post and a cable baffle. The winding post is fixed to the bottom plate of the housing, and the cable baffle is fixed to the upper end face of the winding post. The coaxial cable is wound on the winding post and located between the bottom plate and the cable baffle.

8. The 5G high-power low-intermodulation broadband load according to claim 1, characterized in that: It also includes a heat dissipation device, which includes an upper heat sink and a lower heat sink. The upper heat sink is fixed at the upper opening of the housing, and the lower heat sink is fixed at the lower end face of the housing and abuts against the bottom plate of the housing.

9. The 5G high-power low-intermodulation broadband load according to claim 8, characterized in that: A second sealing ring is provided between the upper heat sink and the housing to seal the connection between the two, and a first sealing ring is provided between the connector and the housing to seal the connection between the two.

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