Transmission system and antenna structure

Abstract

The utility model relates to the technical field of antenna signal transmission, discloses a transmission system and an antenna structure, and aims to improve the antenna performance and solve the problems of resonance and third-order cross modulation in the prior art. The transmission system comprises a reflecting plate and a coaxial cable, the coaxial cable comprises an inner conductor and an outer conductor, the outer conductor is directly connected with the reflecting plate in a welding mode, and effective transmission of radio frequency signals and shielding of electromagnetic interference are guaranteed. The antenna structure integrates the transmission system and an antenna radiation element, and efficient signal transmitting and receiving are achieved. The system is suitable for various antenna forms, such as a plastic electroplating antenna and an air microstrip antenna, an innovative connection mode is provided, and the performance and reliability of the communication system are enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antenna signal transmission, and further relates to a transmission system and an antenna structure. BACKGROUND

[0002] With the rapid development of mobile communication technology, the requirements for antenna performance are increasingly stringent, especially in terms of signal transmission efficiency, stability and frequency coverage range. As a widely used transmission medium in communication systems, the connection mode and welding quality of coaxial cables have a direct impact on the performance of antennas.

[0003] The existing coaxial cable connection mode usually welds the coaxial cable to a metal sheet, and then fixes the metal sheet to a reflector plate, but such a setting has the risk of generating third-order intermodulation distortion, which can reduce the quality of signals and the reliability of the system. In addition, some designs use a coupling method to connect the outer conductor of the coaxial cable to the reflector plate, but due to unstable contact surface, this scheme can still cause resonance or third-order intermodulation distortion, thereby affecting the performance of the antenna. CONTENT OF THE INVENTION

[0004] In view of the above technical problems, the present application aims to provide a transmission system and an antenna structure, which can ensure stable connection of the coaxial cable and reduce resonance and third-order intermodulation distortion.

[0005] To achieve the above-mentioned purpose, the present application provides a transmission system for an antenna, comprising:

[0006] a reflector plate;

[0007] a coaxial cable for transmitting radio frequency signals, comprising an inner conductor and an outer conductor, the outer conductor being wrapped around at least part of the outer periphery of the inner conductor, and the outer conductor and the reflector plate being weldedly connected.

[0008] In some embodiments, the outer conductor is directly welded and fixed to the surface of the reflector plate.

[0009] In some embodiments, the reflector plate has a bending portion, and the outer conductor is welded and fixed to the bending portion.

[0010] In some embodiments, the reflector plate is formed by cutting at least one movable spring sheet, and the spring sheet forms the bending portion by at least one bending;

[0011] The tail section of the bending portion forms a preset included angle with the surface of the reflector plate.

[0012] In some embodiments, the transmission system further comprises a dielectric substrate and a transmission line structure, the dielectric substrate is arranged on one side or both sides of the reflecting plate, the transmission line structure is arranged on the dielectric substrate, the inner conductor is connected to the dielectric substrate and forms an electrical connection with the transmission line structure.

[0013] In some embodiments, the inner conductor is connected to the transmission line structure in direct current.

[0014] In some embodiments, the inner conductor is welded to a preset pad or a preset soldering point of the dielectric substrate.

[0015] Alternatively, a mechanical and electrical connection is formed between the inner conductor and the transmission line structure through crimping.

[0016] Alternatively, a socket or a connector is arranged on the dielectric substrate, and the inner conductor forms an electrical connection with the transmission line structure through the socket or the connector.

[0017] In some embodiments, the inner conductor is coupled to the transmission line structure.

[0018] In some embodiments, the transmission line structure is coupled to a conductive element, and the conductive element is directly or indirectly connected to the dielectric substrate.

[0019] The inner conductor is welded to the conductive element to achieve electrical connection with the transmission line structure.

[0020] In some embodiments, the transmission system further comprises a PCB board, the PCB board is fixed to the dielectric substrate, the transmission line structure is coupled to the PCB board, and the inner conductor is welded to the PCB board.

[0021] In some embodiments, a fixing structure is arranged on the dielectric substrate, the fixing structure is matched with the outer conductor of the coaxial cable, and is used to relatively fix the coaxial cable and the dielectric substrate.

[0022] Another aspect of the present application also provides an antenna structure, comprising the transmission system and an antenna radiation element, the antenna radiation element is connected to the transmission system and is used to transmit or receive radio frequency signals.

[0023] Compared with the prior art, the transmission system and the antenna structure provided by the present application have the following beneficial effects:

[0024] 1. By directly soldering the outer conductor of the coaxial cable to the reflector plate, a common ground design is achieved. First, the direct soldering method simplifies the structure, eliminates the need for additional adapters, and thus reduces the complexity and cost of the system. In addition, by providing a continuous ground path, the direct soldering connection between the outer conductor of the coaxial cable and the reflector plate reduces the third-order intermodulation distortion during signal transmission, thereby improving the overall performance of the system.

[0025] 2. By soldering the inner conductor of the coaxial cable to the conductive element and coupling the conductive element to the transmission line structure, the manufacturing process is simplified, the stability and reliability of the connection are improved, and the problem of the antenna structure and the inner conductor connection part being unsustainable or requiring multiple soldering in the traditional connection method is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above-mentioned features, technical characteristics, advantages and implementation methods of the present application will be further described in a clear and understandable manner in combination with the preferred embodiments and the accompanying drawings.

[0027] Figure 1 is an exploded structure diagram of an embodiment of the present application;

[0028] Figure 2 is a schematic diagram of the overall structure of an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of the local exploded structure of an embodiment of the present application;

[0030] Figure 4 is a local detail view of the inner conductor DC connection to the transmission line structure in an embodiment of the present application;

[0031] Figure 5 is a schematic diagram of the local exploded structure of an embodiment of the present application;

[0032] Figure 6 is a local detail view of the inner conductor coupling connection to the transmission line structure in an embodiment of the present application.

[0033] BRIEF DESCRIPTION OF DRAWINGS: Reflector plate 1; bending part 100; coaxial cable 2; inner conductor 21; outer conductor 22; dielectric substrate 3; first via hole 300; transmission line structure 4; PCB board 5; PCB coupling trace 51; metal pin 60; second via hole 70; fixing screw 80; fixing clamping slot 81. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0035] In order to make the drawing simple, only the parts related to the application are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0036] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0037] In this paper, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation to the present application.

[0039] In addition, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] In the field of mobile communication, with the rapid development of technology and the increasing demand of users, the requirement for antenna performance is also increasing. As a key component in the communication system, the performance of the antenna directly affects the transmission efficiency and communication quality of the signal. Coaxial cable is widely used to connect the antenna and the transmitting / receiving device due to its stable signal transmission characteristics and good shielding effect. However, the connection method of the coaxial cable, especially the welding quality, has a decisive influence on the performance of the antenna.

[0041] In the existing technology, the welding scheme of the traditional PCB microstrip antenna is relatively mature, which can provide stable radio frequency signal transmission. However, for new antenna designs such as plastic plated antennas and air microstrip antennas, the problem of direct current grounding of the outer conductor is still a design difficulty. Due to the particularity of the material and structure of these antennas, it is difficult to achieve stable grounding of the outer conductor, which affects the efficiency and reliability of the antenna.

[0042] In addition, the existing welding scheme usually involves welding the coaxial cable to a metal sheet, and then fixing the metal sheet to the reflector plate. Although this scheme achieves the connection of the coaxial cable and the antenna structure to some extent, it inevitably increases the risk of third-order intermodulation distortion, thereby reducing the quality of the signal and the reliability of the system. In some designs, in order to reduce the third-order intermodulation distortion, a coupling method is used to connect the outer conductor of the cable and the reflector plate, but due to the instability of the contact surface, there is still a possibility of resonance or third-order intermodulation distortion.

[0043] In one embodiment, referring to the accompanying drawings Figure 1 The transmission system provided by the present application can avoid the problems in the prior art, and can provide a scheme for stable direct current grounding, reducing resonance and third-order intermodulation distortion, thereby improving the transmission efficiency and quality of the transmission system.

[0044] Referring to the accompanying drawings Figure 1 and Figure 2 The transmission system for the antenna provided by the present application mainly includes a reflector plate 1 and a coaxial cable 2, and the coaxial cable 2 is used to transmit radio frequency signals.

[0045] Further referring to the accompanying drawings Figure 3 The coaxial cable 2 includes an inner conductor 21 located inside and an outer conductor 22 wrapped outside the inner conductor 21, the inner conductor 21 is used to conduct the main radio frequency current, and the outer conductor 22 is mainly used to provide shielding to protect the signal from external electromagnetic interference. The outer conductor 22 and the reflector plate 1 are connected by welding.

[0046] It is understood that in traditional connection methods, the outer conductor 22 of the coaxial cable 2 often needs to be connected to the reflector plate 1 through an adapter or a complex coupling mechanism, which not only increases the complexity of the system, but also introduces potential failure points. However, in the present embodiment, by directly welding the outer conductor 22 of the coaxial cable 2 to the reflector plate 1, the connection process is simplified, and the stability and reliability of the system are improved.

[0047] Specifically, the direct welding connection method in the present embodiment eliminates the need for an adapter, thereby reducing the cost and complexity of the system; secondly, the welded connection provides a stable electrical and mechanical connection point, reducing the risk of signal loss and system failure due to poor contact or loose connection; in addition, this connection method also improves the electromagnetic compatibility of the system, providing a continuous ground path, which helps to reduce electromagnetic interference.

[0048] Meanwhile, in the specific implementation process, a predetermined welding area can be provided on the reflector plate 1, and the operator or the system will control and position the outer conductor 22 of the coaxial cable 2 to align with the predetermined welding area of the reflector plate 1; in some embodiments, shielding material can also be added around the welding area to further enhance the shielding effect of the system.

[0049] Based on the above embodiments, further, as shown in Figure 5 The transmission system further includes a dielectric substrate 3 and a transmission line structure 4, and the transmission line structure 4 is arranged on the dielectric substrate 3.

[0050] In the above, the inner conductor 21 of the coaxial cable 2 is connected to the dielectric substrate 3 and forms an electrical connection with the transmission line structure 4, and in the present embodiment, the connection method of the inner conductor 21 and the transmission line structure 4 is not limited, which can be direct welding or realized through a dedicated connector or socket. In some embodiments, the inner conductor 21 can be in contact with the transmission line structure 4 through a transition piece, such as a metal spring or a conductive gasket, to ensure good electrical connection.

[0051] It should also be noted that in the implementation of the present solution, different materials and structures can be selected to optimize the performance of the transmission line structure 4. For example, the transmission line structure 4 can be designed as a microstrip line or a strip line, depending on the required impedance matching and frequency characteristics. In addition, in order to improve the electromagnetic compatibility of the system, optionally, a ground layer can be added on the other side of the dielectric substrate 3 to provide better shielding effect.

[0052] As shown in the accompanying drawings of the present application, Figure 2As shown, the dielectric substrate 3 is disposed on one side of the reflector plate 1, such that the dielectric substrate 3 forms a single-sided contact with the reflector plate 1, thereby providing a stable mechanical support and electrical connection path. The connection between the dielectric substrate 3 and the reflector plate 1 can be achieved in various ways, including but not limited to soldering, adhesion, or using mechanical fasteners such as screws and clamps.

[0053] However, in other embodiments, dielectric substrates 3 and corresponding transmission line structures 4 can be disposed on both sides of the reflector plate 1, and multiple coaxial cables 2 can be used, with different cables connected independently to the transmission line structures 4 on both sides, to achieve more efficient signal transmission and distribution in the system.

[0054] It can be noted that in the present application, the outer conductor 22 of the coaxial cable 2 is soldered to the reflector plate 1, while the inner conductor 21 of the coaxial cable 2 is electrically connected to the outer conductor 22 through the transmission line structure 4 on the dielectric substrate 3, ensuring electrical continuity between the inner and outer conductors 21 and 22 and between the entire system and the ground, thereby achieving common ground.

[0055] Specifically, the soldered connection between the outer conductor 22 of the coaxial cable 2 and the reflector plate 1 not only provides shielding effect, but also establishes a stable ground reference point.

[0056] This ground reference point is crucial because it provides a common ground point for the inner and outer conductors 21 and 22. During signal transmission from the coaxial cable 2 to the antenna radiating element, the transmission line structure 4 on the dielectric substrate 3 acts as a bridge, indirectly connecting the inner and outer conductors 21 and 22. This design ensures that the inner and outer conductors 21 and 22 share the same ground point, i.e. the reflector plate 1, in terms of electricity, thereby achieving common ground, reducing the risk of resonance and third-order intermodulation distortion caused by discontinuity of the ground point, and improving the stability of signal transmission and communication quality.

[0057] On the other hand, it also reduces the potential difference between the inner and outer conductors 21 and 22 due to different ground points, which helps to reduce interference during signal transmission.

[0058] In other embodiments, to further optimize the common ground effect, additional ground paths can be added between the dielectric substrate 3 and the reflector plate 1, such as through conductive glue or conductive pads, which can provide additional ground continuity and ensure the stability and reliability of the system under various environmental conditions.

[0059] In one embodiment, the outer conductor 22 is directly soldered and fixed to the surface of the reflector plate 1, ensuring electrical and physical continuity between the outer conductor 22 and the reflector plate 1, which is typically made of metal and serves as part of the antenna structure to reflect radio waves and enhance the antenna's radiation pattern.

[0060] As shown in Figure 3 and Figure 4 , the reflector plate 1 is provided with one or more bending portions 100 for welding and fixing with the outer conductor 22 of the coaxial cable 2, so that the outer conductor 22 can be adjusted in geometry and position through the bending portion 100 to adapt to different installation environments and angle, height requirements, making the antenna production process more simple and fast, reducing the installation time and cost.

[0061] Specifically, by introducing the bending portion 100, the contact area between the reflector plate 1 and the outer conductor 22 of the coaxial cable 2 is significantly increased, not only providing a larger welding area, but also providing more support points, making the connection between the outer conductor 22 and the reflector plate 1 more secure, reducing the risk of connection loosening due to vibration or impact. At the same time, it is beneficial to improve the effectiveness of electrical connection, reduce the contact resistance, and thus improve the efficiency of signal transmission.

[0062] Further, as shown in Figure 3 , at least one first via hole 300 is provided on the dielectric substrate 3, which is used to enable the bending portion 100 of the reflector plate 1 to pass from one side of the dielectric substrate 3 to the other side, so that the bending portion 100 directly contacts the outer conductor 22 of the coaxial cable 2 and is welded and fixed on the other side.

[0063] In addition, by providing the first via hole 300, a flexible connection mode is provided to adapt to the connection requirements of the inner and outer conductors 22 of the coaxial cable 2 at different positions on the dielectric substrate 3. The bending portion 100 on the reflector plate 1 can be selected to pass through the first via hole 300 or directly connect with the outer conductor 22 according to the specific position of the connection point of the inner conductor 21. For example, in the case of the figure, if the connection point of the inner conductor 21 is located on the side of the dielectric substrate 3 away from the reflector plate 1, the bending portion 100 can pass through the first via hole 300 to this side and be welded and connected with the outer conductor 22; if the connection point of the inner conductor 21 is located on the side of the dielectric substrate 3 close to the reflector plate 1, the bending portion 100 does not need to pass through the via hole and can be directly connected with the outer conductor 22.

[0064] In one embodiment, based on the above embodiment, the reflector plate 1 is formed by cutting at least one movable spring, and the spring is formed by bending at least once to form the bending portion 100. By using the material of the reflector plate 1 itself to form the spring and the bending portion 100, no additional adapter or complex mechanical structure is needed, simplifying the overall design.

[0065] The tail section of the bending part 100 forms a preset angle with the surface of the reflecting plate 1, so that the spring sheet can be directly welded and fixed with the outer conductor 22 of the coaxial cable 2 without adding additional components. Different settings of the preset angle enable the bending part 100 to adapt to different installation angles and height requirements, providing greater design flexibility and adaptability. In the drawings of the present application, the preset angle is basically 90°, but in other embodiments, it can also be a smaller angle, depending on different needs, cable size, and other factors during connection.

[0066] In summary, the size, shape of the spring sheet, and the angle of the bending part 100 can be optimized according to specific design requirements and installation conditions. For example, the spring sheet can be designed with different lengths and widths to accommodate coaxial cables 2 of different sizes, or the angle of the bending part 100 can be adjusted to achieve optimal installation results.

[0067] In addition, according to specific circumstances, as shown in Figure 5 One or more second vias 70 can be provided on the dielectric substrate 3 and the reflecting plate 1, providing a routing path for the coaxial cable 2, which helps to reduce cable bending and twisting, thereby reducing signal loss. At the same time, the installation of the cable can be adjusted according to the actual installation environment and space conditions.

[0068] Based on the above embodiments, the present application further provides connection methods for the inner conductor 21 and the transmission line structure 4: direct current connection and coupling connection, to adapt to different application scenarios and performance requirements.

[0069] Regarding direct current connection, in one embodiment, the first method is to directly weld and fix the inner conductor 21 to the preset pad or preset solder point on the dielectric substrate 3. The preset solder point can be a metal pin 60 pre-buried in the dielectric substrate 3, providing a stable contact point for welding, as shown in the accompanying Figure 3 This welding connection ensures long-term stability and low contact resistance of the electrical connection, suitable for applications requiring high strength and high reliability.

[0070] The second method is to form a mechanical and electrical connection through crimping. Specifically, the connection between the inner conductor 21 and the transmission line structure 4 does not rely on welding, but rather the mechanical pressure makes the two in close contact, thereby achieving electrical connection. Crimping connection provides a quick and reliable connection method, suitable for applications requiring quick assembly or disassembly.

[0071] The third way is to provide sockets or connectors on the dielectric substrate 3, and the inner conductor 21 is electrically connected to the transmission line structure 4 through these sockets or connectors, so that the quick plug-in and plug-out between the inner conductor 21 and the transmission line structure 4 facilitates on-site maintenance and replacement. In this scheme, a standardized connection mode is provided through the sockets or connectors, which helps to improve the compatibility and flexibility of the system.

[0072] Regarding the coupling connection, in one embodiment, the transmission system uses a conductive element as an intermediary to achieve the coupling connection between the inner conductor 21 and the transmission line structure 4. Specifically, the transmission line structure 4 and the conductive element are coupled, and the conductive element is directly or indirectly connected to the dielectric substrate 3.

[0073] In this scheme, the coupling connection between the conductive element and the transmission line structure 4 can be achieved in various ways, including but not limited to capacitive coupling, inductive coupling, or electromagnetic coupling, which allows the communication signal to be transmitted without physical contact. At the same time, the conductive element can be any shape of conductor.

[0074] The connection between the inner conductor 21 and the conductive element is achieved by welding, which ensures the stability and reliability of the electrical connection and facilitates efficient transmission of signals. In addition, the welded connection also provides good mechanical stability, ensuring the durability of the connection under various environmental conditions.

[0075] It should also be noted that "the conductive element is directly or indirectly connected to the dielectric substrate 3" involves two connection methods, each with its own specific application scenarios and technical advantages.

[0076] Among them, the direct connection method is to have a clear and direct physical connection between the conductive element and the dielectric substrate 3, for example, the conductive element can be attached to the dielectric substrate 3 using conductive glue or other adhesives, or the conductive element can be fixed to the dielectric substrate 3 through screws, rivets, or other mechanical fasteners; while the indirect connection method is to connect the conductive element to the dielectric substrate 3 through intermediate components, for example, using a conductive bridge or other conductive paths such as conductive traces or conductive foils to connect the conductive element to the dielectric substrate 3, or using springs or elastic sheets and other elastic elements to form a stable electrical connection between the conductive element and the dielectric substrate 3.

[0077] Based on the above embodiments, the conductive element in the above content can be any one or a combination of several of the metal strip, metal block, metal sheet, or metal ring.

[0078] It can be understood that the selection and shape of the conductive elements depend on the specific application requirements and design optimization. Metal strips and metal blocks can provide stronger mechanical stability due to their larger contact area, while metal sheets and metal rings are more flexible and easy to shape. By reasonably selecting and combining these conductive elements, efficient coupling connection with the transmission line structure 4 can be achieved.

[0079] In one embodiment, as shown in Figure 5 and Figure 6 The transmission system also includes a PCB board 5, which is fixed to the dielectric substrate 3, while as known above, the transmission line structure 4 is also arranged on the dielectric substrate 3, responsible for transmitting radio frequency signals on the dielectric substrate 3. The transmission line structure 4 can be custom designed according to the required electrical characteristics and signal path to meet specific frequency and impedance requirements.

[0080] Importantly, the PCB board 5 is provided with a PCB coupling trace 51, which is coupled to the transmission line structure 4 on the dielectric substrate 3. The coupling connection can be capacitive, inductive, or based on the principle of electromagnetic induction, so that the radio frequency signal can be transmitted between the two different conductive paths without physical contact.

[0081] Based on the arrangement in this embodiment, the system realizes efficient signal transmission while maintaining electrical isolation, reducing signal interference and loss that may be caused by direct contact. In addition, the coupling connection between the PCB coupling trace 51 and the transmission line structure 4 provides design flexibility, which can adjust the coupling strength and characteristics according to different application requirements.

[0082] In this embodiment, the PCB board 5 is connected to the dielectric substrate 3 by fixing bolts 80, but in other embodiments, the PCB board 5 can also be connected to the dielectric substrate 3 by other connection methods to adapt to different installation environments and design requirements, including but not limited to bonding, snap connection, clamp fixing, etc.

[0083] Among them, the use of the PCB board 5 in this embodiment integrates multiple circuit elements and functions into a compact space, improving the integration of the system. Moreover, the inner conductor 21 of the coaxial cable 2 is fixed to the preset welding point of the PCB board 5 by welding, which provides a stable electrical and mechanical connection point, ensuring the continuity and stability of signal transmission from the coaxial cable 2 to the transmission line structure 4.

[0084] It should also be noted that the above content mentions the connection between the inner conductor 21 of the coaxial cable 2 and the transmission line structure 4. In traditional connection schemes, due to material characteristics and structural limitations, antenna types such as plastic electroplated antennas often face the problem of unsustainable welding or the need for repeated welding when connecting to the inner conductor 21 of the coaxial cable 2. This not only increases manufacturing costs but also reduces product reliability.

[0085] In summary, in this embodiment, the inner conductor 21 of the coaxial cable 2 is fixed to the PCB board 5 by welding, and the PCB coupling trace 51 of the PCB board 5 is coupled to the transmission line structure 4 on the dielectric substrate 3, thereby establishing a stable electrical connection between the inner conductor 21 and the transmission line structure 4, avoiding the need for direct welding on materials that are difficult to weld, such as plastic electroplated antennas. The setting of conductive components mentioned above also avoids this problem, which will not be repeated here.

[0086] In one embodiment, in order to ensure the stability and reliability between the coaxial cable 2 and the dielectric substrate 3, a fixing structure is provided on the dielectric substrate 3. The fixing structure can be adapted to the outer conductor 22 of the coaxial cable 2 to achieve relative fixation between the coaxial cable 2 and the dielectric substrate 3.

[0087] The design of the fixing structure takes into account the size and shape of the outer conductor 22 of the coaxial cable 2, ensuring a precise fit between the two. This fixing method can take various forms, including but not limited to fixing clamps, fixing slots 81, fixing rings, or specially designed fixing holes. These structures can be used independently or in combination to tightly hold the outer conductor 22 of the coaxial cable 2, thereby providing stable mechanical support and effectively fixing the coaxial cable 2 to the dielectric substrate 3, reducing the risk of displacement or detachment due to vibration or external forces.

[0088] Among them, the appendix Figure 5 The mounting structure shown is a mounting slot 81, which is generally suitable for the straight section of the coaxial cable 2, providing a channel for guiding and fixing the cable and ensuring that the cable is laid along a predetermined path; the mounting rings are suitable for the bends or turns of the cable, and they can form a ring structure around the cable to accommodate the bending radius of the cable while maintaining the stability of the cable; the mounting clamps provide direct clamping and fixing of the cable, and are suitable for occasions that require strong fixing or frequent disassembly.

[0089] Based on the content of this embodiment, the fixing structure can be made of the same or different materials as the dielectric substrate 3, such as plastic, metal, or composite materials, to meet different mechanical and electrical performance requirements. The installation of the fixing structure can be permanent or removable to facilitate maintenance and replacement.

[0090] In one embodiment, according to another aspect of the present application, the present application further provides an antenna structure mainly comprising the transmission system and the antenna radiating element as described above.

[0091] The antenna radiating element is connected with the transmission system and is responsible for transmitting or receiving radio frequency signals. Through the integration of the transmission system as described above, the embodiment effectively solves the problems of resonance and the risk of third-order intermodulation, ground discontinuity and the like in the prior art, thereby improving the performance and reliability of the antenna structure.

[0092] As described above, the design of the transmission system establishes a stable electrical connection between the inner conductor 21 of the coaxial cable 2 and the transmission line structure 4 on the dielectric substrate 3, while ensuring that the outer conductor 22 of the coaxial cable 2 forms a firm ground with the reflecting plate 1. This design not only provides a low-impedance grounding path, reducing electromagnetic interference, but also reduces the risk of resonance and third-order intermodulation distortion through the common ground design.

[0093] In addition, the transmission system as described above can be widely used in various antennas, i.e. the antenna structure includes but is not limited to plastic plated antennas and air microstrip antennas, etc., and different embodiments in the above content can also be used in combination with the specific structure and form of the antenna.

[0094] For example, plastic plated antennas are favored due to their lightness and cost-effectiveness, but traditional connection methods often have difficulty providing stable and durable connections. The designs in the above embodiments, such as providing a fixing structure on the dielectric substrate 3 that is adapted to the outer conductor 22 of the coaxial cable 2, and welding the inner conductor 21 to the PCB 5, etc., effectively solve the challenges of plastic plated antennas in terms of connection stability.

[0095] Air microstrip antennas are widely used due to their advantages in high-frequency applications. The combination of the transmission system of the present application can further ensure efficient energy transmission between the air microstrip antenna and the coaxial cable 2, while reducing the risk of resonance and third-order intermodulation.

[0096] Whether it is a plastic plated antenna or an air microstrip antenna, or any other form of antenna structure, the transmission system of the present application can be used to improve the performance of the antenna, enhance the reliability and durability of the system.

[0097] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered within the scope of protection of the present application.

Claims

1. A transmission system for an antenna, characterized by The transmission system comprises: a reflecting plate; a coaxial cable for transmitting radio frequency signals, comprising an inner conductor and an outer conductor, the outer conductor being wrapped around at least part of the outer circumference of the inner conductor, and the outer conductor and the reflecting plate being welded together.

2. The transmission system according to claim 1, wherein the outer conductor is directly welded to the surface of the reflecting plate.

3. The transmission system according to claim 1, wherein the reflecting plate has a bent portion, and the outer conductor is welded to the bent portion.

4. The transmission system according to claim 3, wherein the reflecting plate is formed by cutting to form at least one movable spring piece, and the spring piece is formed by bending at least once to form the bent portion; the tail section of the bent portion forms a preset angle with the surface of the reflecting plate.

5. The transmission system according to any one of claims 1-4, wherein the transmission system further comprises a dielectric substrate and a transmission line structure, the dielectric substrate is arranged on one side or both sides of the reflecting plate, the transmission line structure is arranged on the dielectric substrate, the inner conductor is connected to the dielectric substrate and electrically connected to the transmission line structure.

6. The transmission system according to claim 5, wherein the inner conductor is directly connected to the transmission line structure in DC.

7. The transmission system according to claim 6, wherein the inner conductor is welded to a preset pad or a preset welding point of the dielectric substrate; or, the inner conductor and the transmission line structure are mechanically and electrically connected by crimping; or, the dielectric substrate is provided with a socket or a connector, and the inner conductor is electrically connected to the transmission line structure through the socket or the connector.

8. The transmission system according to claim 5, wherein the inner conductor is coupled to the transmission line structure.

9. The transmission system according to claim 8, wherein the transmission line structure is coupled to a conductive element, and the conductive element is directly or indirectly connected to the dielectric substrate; the inner conductor is welded to the conductive element to realize electrical connection with the transmission line structure.

10. The transmission system according to claim 8, wherein the transmission system further comprises a PCB board, the PCB board is fixed to the dielectric substrate, and the transmission line structure is coupled to the PCB board; wherein the inner conductor is welded to the PCB board.

11. The transmission system according to claim 5, wherein the dielectric substrate is provided with a fixing structure, the fixing structure is matched with the outer conductor of the coaxial cable, and is used to relatively fix the coaxial cable and the dielectric substrate.

12. An antenna structure, characterized by The transmission system according to any one of claims 1-11; an antenna radiation element connected to the transmission system, used for transmitting or receiving radio frequency signals. ​

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