Waterproof device, use method and time domain antenna

Abstract

The invention discloses a waterproof device, a use method and a time domain antenna. The waterproof device comprises a foam body, a sealing colloid and a waterproof box which are sequentially arranged from inside to outside in a space around an antenna feeding point. A traditional antenna cover is not needed, the overall weight and size of the antenna are reduced, the thin-wall waterproof box and the glue pouring layer protect and wrap the periphery of the feeding point area, moisture is effectively prevented from entering the antenna, meanwhile, negative effects on the electrical performance of the antenna are avoided, radiation matching can be optimized through the design of the foam material layer, the electrical performance is further improved, and the antenna is suitable for large-scale popularization and application. And the normal work of the antenna is ensured.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a waterproof device, a use method, and a time domain antenna. Background Art

[0002] Antennas are essential equipment in fields such as wireless communications, radar systems, and satellite communications. However, antennas are exposed to outdoor environments for long periods of time and are susceptible to environmental factors such as rain and moisture, which can lead to corrosion or water ingress at the feed point, thus affecting the normal operation of the antenna. Traditional waterproofing methods typically use radomes to protect the entire antenna, but radomes are not only bulky and expensive, but can also adversely affect the antenna's electrical performance (such as standing wave ratio, gain, radiation efficiency, radiation pattern, etc.), especially in terms of time-domain pulse characteristics, which can cause signal distortion or a decrease in waveform conformity factor. Therefore, how to maintain the antenna's excellent electrical performance while being waterproof has become an urgent problem to be solved.

[0003] In the prior art, the invention patent with patent application publication number CN114204269A discloses a lightweight composite logarithmic periodic antenna and its manufacturing method. The article discloses a coaxial line feed structure provided with a quartz fiber pre-coated cloth, a first adhesive film, a lower array, and a supporting foam. The supporting foam in the patent is a low-density composite material with low dielectric loss, used to support the arrays on both sides, solving the lightweight problem. The quartz fiber pre-coated cloth is a non-woven fabric made of quartz glass fiber material, pre-coated with resin material, and has good resistance to temperature shock and chemical corrosion. It is wrapped around the outermost side of the antenna. After vacuuming and high-temperature curing, all parts of the antenna are condensed into a whole. The resulting antenna structure has light weight, good strength, high power resistance, and waterproof and corrosion resistance. However, this patent protects a manufacturing method of an antenna, and the materials involved are all antenna body. If the supporting foam or quartz fiber pre-coated cloth is removed, it will not be a complete antenna, and the antenna in use cannot be waterproofed. Also, this patent is for a log-periodic antenna, which only needs to meet the ultra-wide and ultra-wideband characteristics. However, for a time domain antenna, the time domain antenna must be ultra-wideband, but ultra-wideband is not necessarily time domain. After the waterproof device of the time domain antenna is added, compared with before it is added, two conditions must be met: first, the frequency domain ultra-wideband characteristics must be maintained; second, it must have conformal characteristics for the time domain waveform. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a waterproof measure for a time domain antenna in use without causing adverse effects on the electrical performance of the time domain antenna.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A waterproof device suitable for a time domain antenna in use comprises a foam body 11, a sealing body 12 and a waterproof box 13 which are sequentially arranged from the inside to the outside in the space around the antenna feeding point.

[0007] Technical Effect: The foam layer design optimizes radiation matching, further improving electrical performance and ensuring the proper functioning of the antenna. The sealant formed by the waterproof box and potting seal protects the antenna feed point area, effectively preventing moisture ingress without negatively impacting the antenna's electrical performance.

[0008] In this embodiment, the filling space of the foam body 11 around the antenna feeding point is ≥1e-5·λ max 3 ; Among them, λ max is the maximum operating wavelength in the band, and e is the exponential part of scientific notation.

[0009] In this embodiment, the wall thickness of the waterproof box 13 is 2 mm to 3 mm.

[0010] The present invention also provides a method for using a waterproof device suitable for a time domain antenna in use, wherein foam is filled in the space around the antenna feeding point to form a foam body 11; a waterproof box 13 is arranged on the periphery of the foam body 11, and a gap is reserved between the waterproof box 13 and the foam body 11; and a sealant is poured into the reserved gap to form a sealing body 12.

[0011] In this embodiment, the filling space of the foam body 11 around the antenna feeding point is ≥1e-5·λ max 3 ; Among them, λ max is the maximum operating wavelength in the band, and e is the exponential part of scientific notation.

[0012] In this embodiment, the wall thickness of the waterproof box 13 is 2 mm to 3 mm.

[0013] The present invention also provides a time domain antenna, comprising an antenna feed arm 21, a ground arm 22 and an antenna floor 23; the antenna feed arm 21 and the ground arm 22 are both connected to the antenna floor 23; and the antenna feed arm 21 is also connected to a feed coaxial dielectric ring 31; at the connection between the antenna feed arm 21, the feed coaxial dielectric ring 31 and the antenna floor 23, the above-mentioned waterproof device suitable for the time domain antenna in use is provided.

[0014] In this embodiment, the side walls of the waterproof box 13 are connected to the ground arm 22 to enclose the antenna feed arm 21 ; the bottom wall of the waterproof box 13 is connected to the antenna floor 23 , and the top of the waterproof box 13 is open.

[0015] In this embodiment, the time domain antenna includes a first electric radiation structure plate 24, a second electric radiation structure plate 25, a first parallel plate 26, and a second parallel plate 27;

[0016] The first electric radiation structure plate 24, the ground arm 22, the antenna ground plate 23 and the first parallel plate 26 are connected in a loop;

[0017] The second electric radiation structure plate 25, the antenna feeding arm 21, the antenna ground plate 23 and the second parallel plate 27 are connected in a loop.

[0018] In this embodiment, the outer conductor 32 is connected via a feeding coaxial dielectric ring 31 .

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention ensures the waterproofing of the antenna feeding point by using a glue-filling sealing method. The design scheme of directly wrapping the feeding point with an intermediate layer of foam ensures that the radiation impedance of electromagnetic wave propagation outside the antenna feeding point is minimally affected, and the electrical performance of the antenna (such as standing wave ratio, gain, radiation efficiency, radiation pattern, etc.) is almost unaffected, especially in terms of time domain pulse characteristics, the signal fidelity or waveform conformality coefficient is almost unaffected. The use of a thinner glue layer in conjunction with a thin-walled Teflon waterproof box ensures both the waterproof sealing effect and good electromagnetic wave penetration. The volume of the entire waterproof device is less than 1 / 300 of that of a traditional antenna cover, which reduces the volume of the entire antenna unit, reduces weight and saves costs. The present invention does not require the use of a traditional antenna cover, reducing the overall weight and volume of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a waterproof device suitable for a time domain antenna in use according to an embodiment of the present invention.

[0021] Figure 2 This is an enlarged view of the waterproof device according to an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of antenna standing wave ratio according to an embodiment of the present invention.

[0023] Figure 4 4 is a gain curve diagram of an embodiment of the present invention.

[0024] Figure 5 FIG. 4 is a radiation efficiency curve diagram of an embodiment of the present invention.

[0025] Figure 6 : This is the E-plane gain lobe diagram of an embodiment of the present invention.

[0026] Figure 7 : This is the H-plane gain lobe diagram of an embodiment of the present invention.

[0027] Figure 8 Schematic diagram of the far-field time-domain pulse waveform according to an embodiment of the present invention.

[0028] Figure 9Schematic diagram of the standing wave ratio of a bare antenna according to an embodiment of the present invention.

[0029] Figure 10 4 is a bare antenna gain curve diagram of an embodiment of the present invention.

[0030] Figure 11 4 is a curve diagram of the radiation efficiency of a bare antenna according to an embodiment of the present invention.

[0031] Figure 12 1 is the E-plane gain lobe diagram of the bare antenna according to an embodiment of the present invention.

[0032] Figure 13 1 is the H-plane gain lobe diagram of the bare antenna according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] To facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described with reference to the accompanying drawings.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0035] Example 1

[0036] See also Figure 1 、 2 As shown, the present invention provides a waterproof device suitable for a time domain antenna in use, comprising: a foam body 11, a sealing body 12 and a waterproof box 13 arranged in sequence from the inside to the outside in the space around the antenna feeding point.

[0037] In this embodiment, a certain space (0.05λ) is formed around the antenna feeding point. max ≥a≥0.01λ max ,0.05λ max ≥b≥0.01λ max ,0.05λ max ≥c≥0.01λ max ), fill with foam to form a foam body 11, ensure that the antenna feeding point is completely sealed, and the filling space around the antenna feeding point is ≥1e-5·λ max 3 Among them, λ max is the maximum operating wavelength in the band, e is the exponent in scientific notation, and a×b×c are the length, width, and height of the filled space, respectively.

[0038] In this embodiment, a thin-walled waterproof box 13 is provided in a larger space outside the foam body 11, with a gap reserved between the waterproof box 13 and the foam body 11. Specifically, the waterproof box 13 is made of ultra-high molecular weight polyethylene (UHMWPE), polyamide (PA), polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), etc., with a wall thickness of 2mm to 3mm and a reserved gap of 10mm to 15mm.

[0039] In this embodiment, sealant is poured into the reserved gap to form a sealant body 12 , ensuring that the sealant body 12 wraps around the antenna feeding point outside the foam body 11 and does not contact the antenna feeding point.

[0040] Example 2

[0041] See also Figure 1 、 2 As shown, the present invention provides a method for using the waterproof device of Example 1, comprising: filling the space around the antenna feed point with foam to form a foam body 11. arranging a waterproof box 13 around the foam body 11, with a gap reserved between the waterproof box 13 and the foam body 11, and filling the reserved gap with sealant to form a sealant body 12.

[0042] Example 3

[0043] See also Figure 1 、 2 As shown, the present invention also provides a time domain antenna, including an antenna feeding arm 21, a ground arm 22, an antenna ground 23, a first electric radiation structure plate 24, a second electric radiation structure plate 25, a first parallel plate 26, and a second parallel plate 27.

[0044] The antenna feed arm 21 and ground arm 22 are both connected to the antenna ground plane 23. The antenna feed arm 21 is also connected to the feed coaxial dielectric ring 31. A waterproofing device is installed at the junction of the antenna feed arm 21, the feed coaxial dielectric ring 31, and the antenna ground plane 23. The antenna feed point is the junction between the antenna feed arm 21 and the feed coaxial inner conductor A, which is inserted into the feed coaxial dielectric ring 31. The antenna feed arm 21 is not connected to the outer conductor 32; instead, it is separated by the feed coaxial dielectric ring 31.

[0045] In this embodiment, the foam body 11 wraps around the antenna feed point A, and the side walls of the waterproof box 13 are connected to the ground arm 22, enclosing the antenna feed arm 21. At this point, the antenna feed arm 21 is within the enclosed area, and a gap is reserved between the foam body 11 and the waterproof box 13. Furthermore, the bottom wall of the waterproof box 13 is connected to the antenna ground 23, and the top of the waterproof box 13 is open, thus forming an open cavity. Sealant is then poured into the cavity to form the sealing body 12.

[0046] In this embodiment, the first electric radiation structure plate 24, the ground arm 22, the antenna floor 23 and the first parallel plate 26 are connected in a loop. The second electric radiation structure plate 25, the antenna feed arm 21, the antenna floor 23 and the second parallel plate 27 are connected in a loop.

[0047] Example 4

[0048] In this embodiment, the time-domain antenna has a center frequency of 0.8 GHz, a bandwidth of 0.2 GHz to 1.4 GHz, a free-space wavelength λ of 1500 mm to 214 mm, and an all-metal structure. The 30 mm x 50 mm x 25 mm space surrounding the antenna feed point is filled with foam to form a foam body 11. A waterproof box 13 is located in a larger space, 40 mm x 65 mm x 25 mm, surrounding the foam body 11. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

[0049] The above model was created in HFSS18 for frequency-domain simulation and then imported into CST 2019 for time-domain simulation. During the CST 2019 time-domain simulation, a Gaussian pulse waveform was fed and a probe was placed 10 meters from the far-field point. After the simulation, the far-field signal was obtained.

[0050] Figures 3 to 7 , are the frequency domain parameters of the HFSS simulation of the present invention in which a waterproof device is set on the time domain antenna, which are respectively the standing wave ratio, gain curve, radiation efficiency curve, E-plane gain lobe diagram, and H-plane gain lobe diagram.

[0051] Figures 9 to 13 , are the frequency domain parameters of the original bare time domain antenna (without waterproof device) simulated by HFSS, which are standing wave ratio, gain curve, radiation efficiency curve, E-plane gain lobe diagram, and H-plane gain lobe diagram.

[0052] By comparison, it can be seen that the frequency domain electrical performance of the time domain antenna, such as standing wave ratio, gain, radiation efficiency, radiation pattern, etc., is almost unaffected. Figure 6 、 Figure 7 、 Figure 12 and Figure 13 The right side of the figure is not incomplete, but a direct screenshot of the software simulation result.

[0053] Figure 8 This is a far-field time-domain pulse comparison chart. The solid line shows the case with a conventional radome, while the dashed line shows the case with the waterproof device of the present invention. It can be seen that the signal with the waterproof device of the present invention has a 0.12ns delay, but a 7% field strength advantage over the conventional radome. The waveform retention characteristic is >0.95, and the pulse tailing is <3ns.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0055] The above-mentioned embodiments merely represent the implementation methods of the invention. The protection scope of the present invention is not limited to the above-mentioned embodiments. For those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention, which all fall within the protection scope of the present invention.

Claims

1. A waterproof device suitable for a time domain antenna in use, characterized in that: The invention comprises a foam body (11), a sealing body (12) and a waterproof box (13) which are sequentially arranged from the inside to the outside in the space around the antenna feeding point.

2. The waterproof device for a time domain antenna in use according to claim 1, characterized in that: The filling space of the foam (11) around the antenna feeding point is ≥1e-5·λ max 3 ; Among them, λ max is the maximum operating wavelength in the band, and e is the exponential part of scientific notation.

3. The waterproof device for a time domain antenna in use according to claim 1, characterized in that: The wall thickness of the waterproof box (13) is 2 mm to 3 mm.

4. A method for using the waterproof device for a time domain antenna in use according to any one of claims 1 to 3, characterized in that: The space around the antenna feeding point is filled with foam to form a foam body (11); a waterproof box (13) is arranged on the periphery of the foam body (11), and a gap is reserved between the waterproof box (13) and the foam body (11); and a sealant is poured into the reserved gap to form a sealant body (12).

5. The method for using the waterproof device according to claim 4, characterized in that: The filling space of the foam (11) around the antenna feeding point is ≥1e-5·λ max 3 ; Among them, λ max is the maximum operating wavelength in the band, and e is the exponential part of scientific notation.

6. The method for using the waterproof device according to claim 4, characterized in that: The wall thickness of the waterproof box (13) is 2 mm to 3 mm.

7. A time domain antenna, characterized in that: The invention comprises an antenna feed arm (21), a ground arm (22) and an antenna floor (23); the antenna feed arm (21) and the ground arm (22) are both connected to the antenna floor (23); and the antenna feed arm (21) is also connected to a feed coaxial dielectric ring (31); at the connection between the antenna feed arm (21), the feed coaxial dielectric ring (31) and the antenna floor (23), a waterproof device suitable for an in-use time domain antenna as described in any one of claims 1 to 3 is provided.

8. The time domain antenna according to claim 7, characterized in that The side wall of the waterproof box (13) is connected to the ground arm (22) to enclose the antenna feed arm (21); The bottom wall of the waterproof box (13) is connected to the antenna floor (23), and the top of the waterproof box (13) is open.

9. The time domain antenna according to claim 7, wherein: The time domain antenna comprises a first electric radiation structure plate (24), a second electric radiation structure plate (25), a first parallel plate (26), and a second parallel plate (27); The first electric radiation structure plate (24), the ground arm (22), the antenna floor (23) and the first parallel plate (26) are connected in a loop; The second electric radiation structure plate (25), the antenna feeding arm (21), the antenna ground (23) and the second parallel plate (27) are connected in a loop.

10. The time domain antenna according to claim 7, wherein: It is connected to the outer conductor (32) via a feeding coaxial dielectric ring (31).

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