Vehicle-mounted biconical antenna

Abstract

The utility model discloses a vehicle-mounted biconical antenna, and relates to the technical field of biconical antennas, in particular to a vehicle-mounted biconical antenna. The antenna comprises an upper cone, a lower cone, a coaxial cable, an upper cone crimping plate and a lower cone crimping plate, the upper cone and the lower cone are connected through a cone connecting piece, the coaxial cable is arranged in the lower cone and penetrates through the upper cone and the lower cone, and the coaxial cable comprises an inner conductor, an outer conductor and an insulating medium between the inner conductor and the outer conductor. The inner conductor is conductively connected with the upper cone through an inner conductor conductive flange, and the outer conductor is conductively connected with the lower cone through an outer conductor conductive flange; the upper cone crimping plate and the lower cone crimping plate are respectively used for fixing the inner conductor conductive flange and the outer conductor conductive flange on the upper cone and the lower cone; according to the utility model, the coaxial cable feeds downwards from the lower cone, so that the problems of eccentric torque and wind load additional couple caused by a traditional supporting rod suspension structure are avoided, and the structural stability and the mechanical property of the antenna are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of biconical antenna technology, specifically a vehicle-mounted biconical antenna. Background Technology

[0002] A biconical antenna is a typical broadband antenna, consisting of two opposing conical or triangular conductors. It is usually fed by a coaxial cable and has advantages such as wide impedance bandwidth, stable radiation characteristics, and good omnidirectionality. Therefore, it is widely used in communication, radar, electronic countermeasures, and electromagnetic testing.

[0003] In existing technologies, biconical antennas generally employ a center-fed structure, where the outer conductor of the coaxial cable is connected to the lower cone, and the inner conductor is connected to the upper cone, thereby achieving broadband matching and signal transmission. In fixed or laboratory environments, this structure can meet most usage requirements.

[0004] However, in automotive applications, if the traditional center-axis feeding method is still used, it is usually necessary to use a support rod with a coaxial cable to suspend the antenna body a certain distance above the vehicle's lifting mast to avoid the lifting mast affecting the antenna's electrical performance. This structure has the following drawbacks:

[0005] 1. The support rod needs to be bent downwards after it is extended to lay a coaxial cable, which increases the structural length and installation difficulty.

[0006] 2. Because the antenna's center of gravity is off-center from the central axis of the lifting mast, the lifting mast needs to withstand a large bending moment, which can easily cause deformation or fatigue damage to the mast.

[0007] 3. Significant impact of wind load: When the antenna is suspended, the windward area increases, causing torque to be generated on the mast and reducing structural stability; moreover, the support mast not only has to bear the weight of the antenna, but also has to resist the wind force, so its strength must be improved, which further increases the load-bearing pressure on the lifting mast.

[0008] In summary, existing vehicle-mounted biconical antennas have shortcomings in terms of stress structure, wind resistance, installation complexity, and long-term stability, making it difficult to meet the comprehensive requirements of vehicle environments for lightweighting, stability, and reliability. Utility Model Content

[0009] The technical problem to be solved by this utility model is to overcome the existing defects and provide a vehicle-mounted biconical antenna. By feeding power from the lower cone of the antenna through a coaxial cable, the antenna axis can be ensured to coincide with the lifting rod, thereby improving the load on the lifting rod and enhancing stability. This can effectively solve the problems in the background art.

[0010] To achieve the above objectives, this utility model provides the following technical solution: a vehicle-mounted biconical antenna, comprising an upper cone, a lower cone, a coaxial cable, an upper cone pressing plate, and a lower cone pressing plate. The upper and lower cones are connected by a cone connector. The coaxial cable is disposed within the lower cone and passes through both the upper and lower cones. The coaxial cable includes an inner conductor, an outer conductor, and an insulating medium between the inner and outer conductors. The antenna also includes an inner conductor conductive flange and an outer conductor conductive flange. The inner conductor conductive flange is electrically connected to the inner conductor of the cable, and has a conductive surface for conductive contact with the upper cone. The outer conductor conductive flange is electrically connected to the outer conductor of the cable, and has a conductive surface for conductive contact with the lower cone. The upper and lower cone pressing plates are respectively used to press and fix the inner and outer conductor conductive flanges onto the upper and lower cones.

[0011] Furthermore, the inner conductor conductive flange is provided with a boss, which is fixed to the inner conductor of the cable by crimping or welding.

[0012] Furthermore, the outer conductor conductive flange is provided with a flange that extends toward the inner conductor conductive flange. This flange is used to extend the outer conductor of the cable to ensure a smaller gap between the outer conductor and the inner conductor of the coaxial cable, thereby achieving better antenna performance.

[0013] Furthermore, it also includes an outer conductor conductive sheet, which is clamped to the outer conductor conductive flange and welded to the outer conductor of the cable.

[0014] Furthermore, the outer conductor conductive sheet and the outer conductor conductive flange are fixed only by compression, without welding.

[0015] Furthermore, the upper and lower conical pressing plates are respectively provided with grooves for accommodating the inner conductor conductive flange and the outer conductor conductive flange. The inner conductor conductive flange and the outer conductor conductive flange are respectively pressed and fixed to the upper and lower cones by screws, thereby ensuring the strength of the connection position and improving stability. This antenna realizes that the coaxial cable feeds downward from the lower cone, so that the antenna axis is arranged coaxially with the axis of the vehicle-mounted lifting pole.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This utility model eliminates the traditional cantilever support rod structure, allowing the antenna body to be directly coaxially arranged with the lifting rod; since the center of gravity coincides with the axis of the lifting rod, the eccentric moment is effectively eliminated, avoiding the deformation of the lifting rod due to bending moment in the traditional structure; no force couple is formed under wind load, the lifting rod is subjected to uniform force, and the structural stability is significantly improved.

[0018] 2. The crimping and conductive connection of the inner and outer conductor conductive flanges ensures a reliable electrical connection between the inner and outer conductors of the coaxial cable and the upper and lower cones, achieving better impedance matching and ensuring the broadband characteristics and omnidirectional radiation performance of the biconical antenna.

[0019] 3. The use of crimping plates, grooves, and screws enhances the fixing strength between the conductive flange and the upper and lower cones, avoiding poor contact problems. Welding or crimping is used to connect the inner and outer conductors to the flange, ensuring the stability of the electrical connection and reducing the risk of failure under vibration. The overall structure is compact and can withstand vibration, impact, and wind impact in a vehicle environment. This utility model breaks through the traditional vehicle-mounted biconical antenna's reliance on a support rod for offset installation, realizing a coaxial design of the bottom feed and the lifting rod, achieving significant improvements in mechanical performance, electrical performance, and engineering applicability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the conical connector structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the installation structure of the outer conductor conductive flange of this utility model;

[0022] Figure 3 This is a schematic diagram of the connection structure between the antenna and the lifting rod of this utility model.

[0023] In the diagram: 1. Coaxial cable, 2. Outer conductor of cable, 3. Lower conical crimping plate, 4. Upper conical crimping plate, 5. Inner conductor of cable, 6. Inner conductor conductive flange, 7. Outer conductor conductive flange, 8. Outer conductor conductive sheet, 9. Upper cone, 10. Lower cone, 11. Conical connector, 12. Screw, 13. Groove, 14. Flange. Detailed Implementation

[0024] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0025] Please see Figure 1-3This utility model provides a technical solution: a vehicle-mounted biconical antenna, including an upper cone 9, a lower cone 10, a coaxial cable 1, an upper cone pressing plate 4, and a lower cone pressing plate 3. The upper cone 9 and the lower cone 10 are connected by a cone connector 11. The coaxial cable 1 is disposed inside the lower cone 10 and passes through the upper cone 9 and the lower cone 10. The coaxial cable 1 is composed of an inner conductor 5, an outer conductor 2, and an insulating medium between them. The antenna further includes an inner conductor conductive flange 6 and an outer conductor conductive flange 7. The inner conductor conductive flange 6 is electrically connected to the inner conductor 5 of the cable and has a conductive surface that is conductively attached to the upper cone 9. The outer conductor conductive flange 7 is electrically connected to the outer conductor 2 of the cable and has a conductive surface that is conductively attached to the lower cone 10. The upper cone pressing plate 4 and the lower cone pressing plate 3 respectively press and fix the inner conductor conductive flange 6 and the outer conductor conductive flange 7 onto the upper cone 9 and the lower cone 10, thereby ensuring structural stability and reliable electrical connection.

[0026] In this embodiment, a boss can be provided on the inner conductor conductive flange 6. The boss is firmly fixed to the inner conductor 5 of the cable by crimping or welding to form a stable electrical path. The boss structure increases the contact area and reduces the contact resistance, which can effectively avoid poor contact and improve conductivity stability. A flange 14 can be provided on the outer conductor conductive flange 7. The flange 14 extends towards the inner conductor conductive flange 6, thereby extending the effective length of the outer conductor 2 of the cable, maintaining a small gap between the outer conductor 2 and the inner conductor 5 of the cable, optimizing the electric field distribution, improving impedance transition, and thus improving the overall performance of the antenna.

[0027] In another embodiment, the antenna also includes an outer conductor conductive sheet 8, which is clamped between the outer conductor conductive flange 7 and the outer conductor 2 of the cable and fixed by welding to form a stable conductive connection, ensuring the conductivity continuity of the outer conductor under vibration or environmental changes. In some cases, the outer conductor conductive sheet 8 can also be fixed by compression without welding, thereby avoiding thermal damage to the insulation layer caused by welding, simplifying the assembly process, and improving maintainability.

[0028] Grooves 13 can be provided on the upper conical pressing plate 4 and the lower conical pressing plate 3 respectively to accommodate the inner conductor conductive flange 6 and the outer conductor conductive flange 7; the conductive flanges 6 and 7 are pressed and fixed on the upper conical 9 and the lower conical 10 by screws 12 to achieve precise positioning and reliable fastening; this structure not only improves the assembly accuracy, but also ensures the long-term stability of the conductive connection; since the power supply path extends downward from the lower conical 10, the antenna and the axis of the vehicle-mounted lifting pole are kept coaxial, which can significantly improve mechanical stability and electrical performance.

[0029] The overall working principle of this vehicle-mounted biconical antenna is as follows: a complete feeding circuit is formed by the conductive bonding of the inner conductor conductive flange 6 with the upper cone 9 and the conductive bonding of the outer conductor conductive flange 7 with the lower cone 10; the coaxial cable 1 is fed into the lower cone 10, and the electrical signal is transmitted to the upper cone 9 through the inner conductor conductive flange 6. At the same time, the outer conductor conductive flange 7 and the lower cone 10 form a good ground connection, thereby realizing the wideband impedance matching and omnidirectional radiation characteristics of the antenna; the pressure plate and groove structure ensure reliable flange positioning and fastening, and the design of the boss, flange and conductive sheet further improves the electrical performance and mechanical stability, making the antenna highly reliable in the vehicle environment.

[0030] Compared to traditional cantilever support rod antennas, this implementation eliminates the cantilever support rod structure, allowing the antenna body to be directly coaxially arranged with the lifting rod. Since the center of gravity coincides with the axis of the lifting rod, deformation or fatigue damage to the rod caused by eccentric torque is effectively avoided. Under wind loads, the structure experiences more uniform stress, significantly enhancing stability. The flange crimping and conductive bonding design ensures reliable electrical connections between the inner and outer conductors and the upper and lower cones, achieving excellent impedance matching and radiation characteristics. The conductors are fixed by welding or crimping, combined with screw locking and groove positioning, avoiding contact loosening issues under vehicle vibration environments, significantly improving long-term reliability and durability. The overall structure is compact and of moderate weight, capable of withstanding vibration, impact, and wind effects under complex vehicle operating conditions, possessing high practicality and engineering application value.

[0031] Under different application conditions, this vehicle-mounted biconical antenna can be appropriately replaced or modified as needed: for example, the connection between the flange and the cone can be changed from crimping to welding, threaded fastening, or plugging; the connection between the boss and the inner conductor of the cable can be brazing, cold pressure welding, or conductive adhesive bonding; the length and shape of the flange can be adjusted according to the operating frequency band; different materials and connection methods can be selected for the conductive sheet; screws can also be replaced with rivets or quick-locking parts; the insulation medium of the coaxial cable can be made of polytetrafluoroethylene, polyethylene, or ceramic materials; the upper and lower cones can be made of aluminum alloy, copper, or stainless steel to balance lightweight and conductivity; through these replacement and modification methods, the antenna can maintain good performance and stability under different operating environments and electrical requirements.

[0032] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A vehicle-mounted biconical antenna, comprising an upper cone (9), a lower cone (10), a coaxial cable (1), an upper cone pressing plate (4), and a lower cone pressing plate (3), characterized in that: The upper cone (9) and the lower cone (10) are connected by a cone connector (11). A coaxial cable (1) is disposed inside the lower cone (10) and passes through the upper cone (9) and the lower cone (10). The coaxial cable (1) includes an inner conductor (5), an outer conductor (2), and an insulating medium between the inner conductor (5) and the outer conductor (2). The antenna also includes an inner conductor conductive flange (6) and an outer conductor conductive flange (7). The inner conductor conductive flange (6) is connected to the inner conductor (5) of the cable. The inner conductor conductive flange (6) is electrically connected to the outer conductor (2) of the cable, and the outer conductor conductive flange (7) is electrically connected to the outer conductor (2) of the cable, and the outer conductor conductive flange (7) is electrically connected to the lower cone (10); the upper cone pressing plate (4) and the lower cone pressing plate (3) are respectively used to press and fix the inner conductor conductive flange (6) and the outer conductor conductive flange (7) on the upper cone (9) and the lower cone (10).

2. The vehicle-mounted biconical antenna according to claim 1, characterized in that: The inner conductor conductive flange (6) is provided with a boss, which is fixed to the inner conductor (5) of the cable by crimping or welding.

3. The vehicle-mounted biconical antenna according to claim 1, characterized in that: The outer conductor conductive flange (7) is provided with a flange (14), which extends toward the inner conductor conductive flange (6).

4. The vehicle-mounted biconical antenna according to claim 1, characterized in that: It also includes an outer conductor conductive sheet (8), which is clamped to the outer conductor conductive flange (7) and welded to the outer conductor (2) of the cable.

5. A vehicle-mounted biconical antenna according to claim 4, characterized in that: The outer conductor conductive sheet (8) and the outer conductor conductive flange (7) are fixed by compression only, without welding.

6. A vehicle-mounted biconical antenna according to claim 1, characterized in that: The upper conical pressing plate (4) and the lower conical pressing plate (3) are respectively provided with grooves (13) for accommodating the inner conductor conductive flange (6) and the outer conductor conductive flange (7). The inner conductor conductive flange (6) and the outer conductor conductive flange (7) are respectively pressed by screws (12) onto the upper conical (9) and the lower conical (10).

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