Asymmetric coupling type double-cage short-wave antenna device

Abstract

The utility model discloses an asymmetric coupling type double-cage short-wave antenna device, and belongs to the technical field of radio short-wave communication. The antenna device comprises a self-supporting tower assembly, a coupling lower cage antenna surface assembly, a direct-feed lower cage antenna surface assembly, a distribution box assembly, a feed end insulator assembly, a direct-feed upper cage antenna surface assembly and a main lightning rod assembly. The asymmetric coupling type double-cage short-wave antenna device provided by the utility model has the characteristics of wider working bandwidth and low elevation radiation, and the antenna surface and the self-supporting tower assembly are designed in an integrated conformal manner, so that the influence of performance index reduction caused by the fact that the self-supporting tower assembly passes through the antenna surface is eliminated; the device not only can cover an ultra-wideband short-wave communication frequency band of nearly four times of frequency, but also can realize excellent performance of low return loss, high gain, low radiation elevation angle and omnidirectional radiation.

Description

Technical Field

[0001] This utility model belongs to the field of radio antenna technology, and in particular relates to an asymmetric coupled dual-cage shortwave antenna device. Background Technology

[0002] Shortwave communication has always been a major means in the field of communication. It can use the ionosphere to achieve long-distance skywave communication, and can also use the earth to achieve short-distance groundwave communication or interference. The communication link is relatively quick to establish and not easy to destroy.

[0003] Currently, traditional shortwave electronic countermeasures and jamming antennas are mostly log-periodic antennas, inverted L antennas, and vertical cage antennas, which cannot meet the strategic requirements of small footprint and omnidirectional near-to-medium range signal suppression. Therefore, this application proposes an asymmetric coupled dual-cage shortwave antenna device to solve the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this utility model relates to an asymmetric coupled dual-cage shortwave antenna device. Its purpose is not only to achieve excellent performance such as omnidirectional radiation, high gain, and low radiation elevation angle, but also to conformally integrate with the self-supporting tower assembly, eliminating the technical challenge of reduced electrical performance caused by the self-supporting tower assembly passing through the antenna surface. This ultimately achieves effective suppression of shortwave signals at near and mid-range ranges.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: an asymmetric coupled dual-cage shortwave antenna device. Its purpose is not only to achieve excellent performance such as omnidirectional radiation, high gain, and low radiation elevation angle, but also to conform to the self-supporting tower assembly, eliminating the technical problem of decreased electrical performance caused by the self-supporting tower assembly passing through the antenna surface. This, in turn, achieves effective suppression of shortwave signals at near and mid-range ranges.

[0008] This utility model discloses an asymmetric coupled dual-cage shortwave antenna device, characterized in that the antenna device includes a self-supporting tower assembly, a coupled lower cage antenna surface assembly, a direct-feed lower cage antenna surface assembly, a tuning box assembly, a feed end insulator assembly, a direct-feed upper cage antenna surface assembly, and a main lightning rod assembly. The coupled lower cage antenna surface assembly, the direct-feed lower cage antenna surface assembly, the tuning box assembly, the feed end insulator assembly, the direct-feed upper cage antenna surface assembly, and the main lightning rod assembly are arranged sequentially from bottom to top on the self-supporting tower assembly.

[0009] The coupled lower cage antenna surface assembly and the direct-feed lower cage antenna surface assembly are longer than the direct-feed upper cage antenna surface assembly in the longitudinal direction of the self-supporting tower assembly. Each of the coupled lower cage antenna surface assembly, the direct-feed lower cage antenna surface assembly, and the direct-feed upper cage antenna surface assembly includes multiple metal rings of different diameters and multiple metal wires. The multiple metal rings are arranged parallel and coaxially on the self-supporting tower assembly via multiple parallel support rods. The parallel support rods are reinforced and fixed to the self-supporting tower assembly by diagonal braces. The multiple metal rings are spaced apart axially on the self-supporting tower assembly, and the multiple metal wires are spaced apart circumferentially on the self-supporting tower assembly. By bending and fixing these wires, the coupled lower cage antenna surface assembly, the direct-feed lower cage antenna surface assembly, and the direct-feed upper cage antenna surface assembly are formed into a cage shape. The multiple metal rings are connected by the multiple metal wires.

[0010] The distribution box assembly includes an RF interface, a metal housing, and a wiring assembly. The RF interface can be connected to corresponding transceiver equipment. The two ends of the wiring assembly are respectively connected to the direct-feed lower cage antenna surface assembly and the direct-feed upper cage antenna surface assembly. A gap arrester is fixed on the wiring assembly; when the antenna encounters lightning, the gap arrester conducts, providing lightning protection.

[0011] The feed end insulator assembly includes a feed end insulator assembly and a feed end auxiliary insulator assembly, which provide insulation between the direct feed lower cage antenna surface assembly and the direct feed upper cage antenna surface assembly.

[0012] The main lightning rod assembly includes a main lightning rod flange and a main lightning rod pole. The main lightning rod flange can be connected to the self-supporting tower assembly via standard parts.

[0013] The coupled lower cage antenna surface assembly is insulated from the self-supporting tower assembly through a bottom vibrator insulation assembly, and the coupled lower cage antenna surface assembly is connected to the direct-feed lower cage antenna surface assembly through a coupled vibrator insulation assembly.

[0014] Optionally, the parallel support rod and the diagonal brace include a metal support rod and an epoxy insulating tube.

[0015] Optionally, the self-supporting tower assembly has a plurality of flanges and ladders extending along the length of the self-supporting tower assembly.

[0016] The beneficial effects of the technical solution provided by this utility model embodiment are:

[0017] The asymmetric coupled dual-cage shortwave antenna device provided in this embodiment of the present invention, for the direct-feed upper cage antenna surface assembly, the direct-feed lower cage antenna surface assembly, and the coupled lower cage antenna surface assembly, adopts an asymmetric cage structure design by calculating the antenna surface current. Each antenna surface element includes multiple metal rings with different side lengths and multiple metal lines. The multiple metal rings are arranged on the self-supporting tower assembly through parallel support rods, and the multiple metal rings are arranged at intervals along the axial direction of the self-supporting tower assembly. The multiple metal lines are arranged at intervals along the circumference of the self-supporting tower assembly. The metal rings are connected by multiple metal lines, thereby improving and ensuring the effective electrical length in the vertical direction and the low elevation angle radiation characteristics of the antenna.

[0018] Furthermore, because the direct-fed lower cage antenna surface assembly and the coupled lower cage antenna surface assembly are connected through the coupling vibrator insulation assembly, a high electromagnetic wave radiation gain across the entire frequency band and an electrical length in the low-frequency band are ensured. Simultaneously, reverse current in the high-frequency band is avoided, which would lead to a deterioration in the voltage standing wave ratio (VSWR) and the appearance of multiple sidelobes affecting radiation (the lower the frequency, the longer the required electrical length, and under certain conditions, a longer antenna generally results in higher radiation efficiency and gain; however, if the antenna size exceeds a certain limit, the resonant point will shift, and reverse current will also appear, affecting the antenna's VSWR, causing sidelobes, and impacting radiation). Therefore, the direct-fed upper cage antenna surface assembly, the direct-fed lower cage antenna surface assembly, and the coupled lower cage antenna surface assembly not only have a large radiation range in the vertical direction (the axis of the self-supporting tower assembly) but also achieve 360° omnidirectional electromagnetic signal radiation.

[0019] For the tuning box assembly, since the impedance of the dual-cage antenna cannot be directly matched with the impedance of the 50Ω RF coaxial cable assembly, and the surface current of the RF coaxial cable assembly needs to be suppressed, the tuning box assembly plays a role in impedance matching and surface current suppression, avoiding radiated energy loss and making the radiation pattern more uniform. The impedance matching principle diagram is shown below. Figure 8 The mixing box assembly uses a ferrite transmission line transformer with multiple ferrite magnetic rings arranged in parallel, which has higher withstand voltage and heat dissipation capacity, and can meet the needs of high power applications.

[0020] Regarding the main lightning rod assembly and the gap arrester, the main lightning rod assembly is fixed on the top of the self-supporting tower assembly, and the gap arrester assembly is fixed on the wiring group assembly of the distribution box assembly. When the antenna encounters lightning, the main lightning rod conducts the lightning through the direct feed upper cage antenna surface assembly to the gap arrester. At this time, the gap arrester will be in a conductive state, and then the gap arrester conducts the lightning to the grounding copper strip at the bottom of the self-supporting tower assembly, thus completing the lightning protection work.

[0021] This asymmetric coupled dual-cage shortwave antenna device, through the provision of a novel conformal ground wave interference antenna with a folded gain, not only achieves coverage of a wide frequency band but also features high radiation gain and low radiation elevation angle, with a uniform radiation pattern and no blind spots, enabling effective suppression of signals at medium and short ranges. Furthermore, this antenna device has lightning protection grounding functionality, ensuring safety for outdoor use. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a dual-band dual-polarized shortwave antenna device provided in an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the direct-feed lower cage antenna surface assembly, the coupled lower cage antenna surface assembly, and the direct-feed upper cage antenna surface assembly provided in this embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the parallel support rod and diagonal brace structure provided in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the mixing box assembly provided in this embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the feeder end insulator assembly provided in this embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the main lightning rod assembly provided in this embodiment of the utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the self-supporting tower assembly provided in this embodiment of the utility model;

[0029] Figure 8 This is a schematic diagram of the matching principle of the mixing box assembly provided in this embodiment of the utility model;

[0030] Figure 9 This is the starting frequency band radiation pattern provided in this embodiment of the utility model;

[0031] Figure 10 This is the center frequency band radiation pattern provided in this embodiment of the utility model;

[0032] Figure 11 This is the termination frequency band radiation pattern provided in this embodiment of the utility model;

[0033] 1. Self-supporting tower assembly; 11. Flange; 12. Ladder; 2. Coupled lower cage antenna surface assembly; 21. Metal ring; 22. Metal wire; 23. Parallel support rod; 231. Metal support rod; 232. Epoxy insulation tube; 24. Diagonal brace; 25. Bottom vibrator insulation assembly; 26. Coupled vibrator insulation assembly; 3. Direct feed lower cage antenna surface assembly; 4. Distribution box assembly; 41. RF interface; 42. Metal housing; 43. Wiring group assembly; 431. Gap surge arrester; 5. Feed end insulator assembly; 51. Feed end main column insulator; 52. Feed end auxiliary insulator; 6. Direct feed upper cage antenna surface assembly; 7. Main lightning rod assembly; 71. Main lightning rod flange; 72. Main lightning rod rod body. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0035] Figure 1 This is a schematic diagram of the structure of an asymmetric coupled dual-cage shortwave antenna device provided in an embodiment of this utility model, as shown below. Figure 1 As shown, an asymmetric coupled dual-cage shortwave antenna device includes a self-supporting tower 1, a coupled lower cage antenna surface assembly 2, a direct-feed lower cage antenna surface assembly 3, a tuning box 4, a feed end insulator assembly 5, a direct-feed upper cage antenna surface assembly 6, and a main lightning rod assembly 7. The coupled lower cage antenna surface assembly 2, the direct-feed lower cage antenna surface assembly 3, the tuning box 4, the feed end insulator assembly 5, the direct-feed upper cage antenna surface assembly 6, and the main lightning rod assembly 7 are arranged sequentially from bottom to top on the self-supporting tower 1.

[0036] Figure 2 This is a schematic diagram of the structure of the direct-feed lower cage antenna surface assembly, the coupled lower cage antenna surface assembly, and the direct-feed upper cage antenna surface assembly provided in this embodiment of the utility model. Figure 2As shown. The lengths of the coupled lower cage antenna surface assembly 2 and the direct-feed lower cage antenna surface assembly 3 in the longitudinal direction of the self-supporting tower assembly 1 are greater than those of the direct-feed upper cage antenna surface assembly 6. Each of the coupled lower cage antenna surface assembly 2, the direct-feed lower cage antenna surface assembly 3, and the direct-feed upper cage antenna surface assembly 6 includes multiple metal rings 21 of different diameters and multiple metal wires 22. The multiple metal rings 21 are arranged parallel and coaxially on the self-supporting tower assembly 1 via multiple parallel support rods 23. The parallel support rods 23 are reinforced and fixed to the self-supporting tower assembly 1 by diagonal braces 24. The multiple metal rings 21 are spaced apart axially in the self-supporting tower assembly 1, and the multiple metal wires 22 are spaced apart circumferentially in the self-supporting tower assembly 1. Through bending and fixing, the coupled lower cage antenna surface assembly 2, the direct-feed lower cage antenna surface assembly 3, and the direct-feed upper cage antenna surface assembly 6 form a cage shape. The multiple metal rings 21 are connected by the multiple metal wires 22. The coupled lower cage antenna surface assembly 2 is insulated from the self-supporting tower assembly 1 via the bottom vibrator insulation assembly 25. The coupled lower cage antenna surface assembly 2 and the direct-feed lower cage antenna surface assembly 3 are connected via the coupled vibrator insulation assembly 26.

[0037] Figure 3 This is a schematic diagram of the parallel support rod and diagonal brace structure provided in an embodiment of this utility model. Figure 3 As shown. The parallel support rod 23 and the diagonal brace 24 include a metal support rod 231 and an epoxy insulating tube 232.

[0038] For the asymmetric coupled dual-cage shortwave antenna device provided in this embodiment of the utility model, for the direct-feed upper cage antenna surface assembly 6, the direct-feed lower cage antenna surface assembly 3, and the coupled lower cage antenna surface assembly 2, it adopts an asymmetric cage structure design by calculating the antenna surface current, and each antenna surface element includes multiple metal rings 21 with different side lengths and multiple metal lines 22. The multiple metal rings 21 are arranged on the self-supporting tower assembly 1 through parallel support rods 23, and the multiple metal rings 21 are arranged at intervals along the axial direction of the self-supporting tower assembly 1. The multiple metal lines 22 are arranged at intervals along the circumference of the self-supporting tower assembly 1. The metal rings 21 are connected by multiple metal lines 22, thereby improving and ensuring the effective electrical length in the vertical direction and the low elevation angle radiation characteristics of the antenna.

[0039] Since the direct-feed lower cage antenna panel assembly 3 and the coupled lower cage antenna panel assembly 2 are connected by the coupled oscillator insulation assembly 26, it ensures a relatively high electromagnetic wave radiation gain across the entire frequency band and the electrical length in the low-frequency band. At the same time, it avoids the occurrence of reverse current in the high-frequency band, which can lead to deterioration of the voltage standing wave ratio and the appearance of multiple side lobes affecting radiation (the lower the frequency, the longer the required electrical length, and under certain conditions, the longer the antenna size, the higher the radiation efficiency and gain. However, when the antenna size exceeds a certain limit, the resonance point will shift, and reverse current will also appear, affecting the antenna voltage standing wave ratio and the appearance of side lobes, affecting radiation). Thus, the direct-feed upper cage antenna panel assembly 6, the direct-feed lower cage antenna panel assembly 3, and the coupled lower cage antenna panel assembly 2 not only have a large radiation range in the vertical direction (the axial direction of the self-supporting tower assembly 1), but also can radiate electromagnetic signals in all directions of 360°.

[0040] Exemplarily, the operating frequency of the direct-feed upper cage antenna panel assembly 6, the direct-feed lower cage antenna panel assembly 3, and the coupled lower cage antenna panel assembly 2 is X MHz to 30 MHz (3 MHz < X < 30 MHz), and they can receive and transmit electromagnetic signals in the vertical polarization mode. The self-supporting tower assembly 1 passes through the direct-feed upper cage antenna panel assembly 6, the direct-feed lower cage antenna panel assembly 3, and the coupled lower cage antenna panel assembly 2. The self-supporting tower assembly 1 is insulated at the feeding point through the high-strength feeding-end insulator assembly 5, and insulation treatment is carried out between the bottom of the coupled lower cage antenna panel assembly 2 and the self-supporting tower assembly 1, eliminating the influence of the self-supporting tower assembly on the antenna performance and realizing the conformal shape of the self-supporting tower assembly and the antenna panel. That is, the antenna device of the present utility model has a small footprint and high integration, and can achieve the function of ultra-wideband signal coverage.

[0041] Exemplarily, the number of metal rings 21 of the direct-feed upper cage antenna panel group 6 and the direct-feed lower cage antenna panel assembly 3 is 3, and the number of metal rings 21 of the coupled lower cage antenna panel assembly is 2. The direct-feed upper cage antenna panel assembly 6 is in the shape of a gem cage, and the direct-feed lower cage antenna panel assembly 3 and the coupled lower cage antenna panel assembly 2 are in the shape of a lantern as a whole.

[0042] Figure 4 It is a schematic structural diagram of the matching box assembly provided by an embodiment of the present utility model. As Figure 4 shown, the matching box assembly 4 includes a radio frequency interface 41, a metal housing 42, and a wiring group assembly 43. The radio frequency interface 41 can be connected to the corresponding transceiver device. Both ends of the wiring group assembly 43 are respectively connected to the direct-feed lower cage antenna panel assembly 3 and the direct-feed upper cage antenna panel assembly 6. A gap lightning arrester 431 is fixed on the wiring group assembly 43. When the antenna encounters lightning, the gap lightning arrester 431 conducts to achieve the lightning protection function.

[0043] For the matching box assembly, the impedance of the dual-cage antenna cannot be directly matched with the impedance of the 50Ω RF coaxial cable assembly, and the surface current of the RF coaxial cable assembly needs to be suppressed. The matching box assembly serves to perform impedance matching and surface current suppression, avoiding radiated energy loss and making the radiation pattern more uniform. The impedance matching principle diagram is shown below. Figure 8 The mixing box assembly uses a ferrite transmission line transformer with multiple ferrite magnetic rings arranged in parallel, which has higher withstand voltage and heat dissipation capacity, and can meet the needs of high-power applications.

[0044] Figure 5 This is a schematic diagram of the structure of the feeder end insulator assembly provided in an embodiment of this utility model, as shown below. Figure 5 As shown, the feed-end insulator assembly 5 includes a feed-end main post insulator 51 and a feed-end auxiliary insulator 52. The feed-end main post insulator 51 and the feed-end auxiliary insulator 52 provide insulation between the direct-feed lower cage antenna surface assembly 3 and the direct-feed upper cage antenna surface assembly 6.

[0045] Figure 6 This is a schematic diagram of the structure of the main lightning rod assembly 7 provided in this embodiment of the utility model, as shown below. Figure 6 As shown, the main lightning rod assembly 7 includes a main lightning rod flange 71 and a main lightning rod body 72. The main lightning rod flange 71 can be connected to the self-supporting tower assembly 1 through standard parts.

[0046] Figure 7 This is a structural schematic diagram of the self-supporting tower assembly provided in an embodiment of the present invention, as shown below. Figure 7 As shown, the self-supporting tower assembly 1 has a plurality of flanges 11 and ladders 12, which extend along the length of the self-supporting tower assembly 1.

[0047] In other words, the novel conformal ground wave interference antenna device with high gain provided by this invention not only covers a wide range of communication frequencies but also features high radiation gain and low radiation elevation angle, with a uniform radiation pattern and no blind spots, enabling effective suppression of signals at medium and short ranges. Furthermore, this antenna device has lightning protection grounding functionality, ensuring safety for outdoor use.

[0048] The beneficial effects of this utility model are as follows:

[0049] The direct-feed upper cage antenna surface assembly 6 adopts a sapphire cage shape, and the direct-feed lower cage antenna surface assembly 3 and the coupled lower cage antenna surface assembly 2 form a lantern shape. The direct-feed upper cage antenna surface assembly 3 and the coupled lower cage antenna surface assembly 2 are connected by a coupling vibrator insulation assembly 26 to ensure an insulation gap, so that the current distribution is uniform and there is no reverse current, the impedance curve is flat, and the voltage standing wave ratio characteristics are achieved over a wide range.

[0050] The direct-feed upper cage antenna surface assembly 6 adopts a jewel cage shape, and the direct-feed lower cage antenna surface assembly 3 and the coupled lower cage antenna surface assembly 2 form a lantern shape. The direct-feed upper cage antenna surface assembly 3 and the coupled lower cage antenna surface assembly 2 are connected by a coupling vibrator insulation assembly 26 to ensure an insulation gap, so that the current distribution is uniform and there is no reverse direction. The antenna radiation elevation angle is 2° to 5°. Furthermore, by utilizing ground wave propagation, it can effectively suppress shortwave signals at near and mid-range distances.

[0051] The direct-feed upper cage antenna surface assembly 6 adopts a sapphire cage shape, and the direct-feed lower cage antenna surface assembly 3 and the coupled lower cage antenna surface assembly 2 form a lantern shape, which has two polarization components, horizontal and vertical. This can solve the communication polarization loss under shortwave time-varying channel to a certain extent and improve the signal transmission capability of shortwave system.

[0052] Figure 9 This is the starting frequency band radiation pattern provided in this embodiment of the utility model. Figure 10 This is the center frequency band radiation pattern provided in this embodiment of the utility model. Figure 11 The termination frequency band radiation pattern provided in this embodiment of the utility model is shown in the figure. Through electromagnetic simulation software simulation calculation, the antenna can achieve effective beam coverage in the range of 2° to 5° in each working frequency band without obvious directional depression, and can achieve signal suppression without blind spots in the corresponding beam coverage range.

[0053] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An asymmetric coupled dual-cage shortwave antenna device, characterized in that, The antenna device includes a self-supporting tower assembly (1), a coupled lower cage antenna surface assembly (2), a direct feed lower cage antenna surface assembly (3), a tuning box assembly (4), a feed end insulator assembly (5), a direct feed upper cage antenna surface assembly (6), and a main lightning rod assembly (7). The coupled lower cage antenna surface assembly (2), the direct feed lower cage antenna surface assembly (3), the tuning box assembly (4), the feed end insulator assembly (5), the direct feed upper cage antenna surface assembly (6), and the main lightning rod assembly (7) are arranged sequentially from bottom to top on the self-supporting tower assembly (1). The lengths of the coupled lower cage antenna surface assembly (2) and the direct-feed lower cage antenna surface assembly (3) in the longitudinal direction of the self-supporting tower assembly (1) are greater than those of the direct-feed upper cage antenna surface assembly (6). The coupled lower cage antenna surface assembly (2), the direct-feed lower cage antenna surface assembly (3), and the direct-feed upper cage antenna surface assembly (6) all include multiple metal rings (21) of different diameters and multiple metal wires (22). The multiple metal rings (21) are arranged parallel and coaxially on the self-supporting tower assembly (1) via multiple parallel support rods (23). The parallel support rods (23) are reinforced and fixed to the self-supporting tower assembly (1) by diagonal braces (24), and the multiple metal rings (21) are arranged in a parallel and coaxial manner on the self-supporting tower assembly (1). The self-supporting tower assembly (1) is arranged axially at intervals, and a plurality of metal wires (22) are arranged circumferentially at intervals along the self-supporting tower assembly (1). By bending and fixing, the coupled lower cage antenna surface assembly (2), the direct feed lower cage antenna surface assembly (3), and the direct feed upper cage antenna surface assembly (6) are presented in a cage shape; the plurality of metal rings (21) are connected to each other by the plurality of metal wires (22); the coupled lower cage antenna surface assembly (2) is insulated from the self-supporting tower assembly (1) through the bottom vibrator insulation assembly (25); the coupled lower cage antenna surface assembly (2) and the direct feed lower cage antenna surface assembly (3) are connected through the coupled vibrator insulation assembly (26).

2. The asymmetric coupled dual-cage wave antenna device according to claim 1, characterized in that: The parallel support rod (23) and the diagonal brace (24) include a metal support rod (231) and an epoxy insulating tube (232).

3. The asymmetric coupled dual-cage shortwave antenna device according to claim 2, characterized in that: The distribution box assembly (4) includes a radio frequency interface (41), a metal housing (42), and a wiring assembly (43); the radio frequency interface (41) can be connected to the corresponding transceiver equipment; the two ends of the wiring assembly (43) are respectively connected to the direct feed lower cage antenna surface assembly (3) and the direct feed upper cage antenna surface assembly (6); a gap arrester (431) is fixed on the wiring assembly (43), and when the antenna encounters lightning, the gap arrester (431) is turned on to realize the lightning protection function.

4. The asymmetric coupled dual-cage shortwave antenna device according to claim 3, characterized in that: The feed end insulator assembly (5) includes a feed end main post insulator (51) and a feed end auxiliary insulator (52); the feed end main post insulator (51) and the feed end auxiliary insulator (52) realize the insulation between the direct feed lower cage antenna surface assembly (3) and the direct feed upper cage antenna surface assembly (6).

5. An asymmetric coupled dual-cage shortwave antenna device according to claim 4, characterized in that: The main lightning rod assembly (7) includes a main lightning rod flange (71) and a main lightning rod body (72). The main lightning rod flange (71) can be connected to the self-supporting tower assembly (1) via standard parts.

6. An asymmetric coupled dual-cage shortwave antenna device according to claim 5, characterized in that: The self-supporting tower assembly (1) has a plurality of flanges (11) and ladders (12) extending along the length of the self-supporting tower assembly (1).

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