A magnetic ring isolated seawater antenna device

Abstract

This invention discloses a magnetic ring-isolated seawater antenna device, belonging to the field of wireless communication technology. It includes a magnetic ring, a hollow tube, and a perforated conductor plate. The perforated conductor plate has a through hole, through which the hollow tube passes and connects, or the hollow tube is located on the top surface of the perforated conductor plate, with the centers of the hollow tube and the through hole coinciding. The perforated conductor plate can float on the sea surface. A magnetic ring is fitted around the outside of the hollow tube, and epoxy resin is filled around the magnetic ring and between the magnetic ring and the hollow tube to form an encapsulation structure. A conductor sheet is provided on the inner wall of the hollow tube, and the conductor sheet is connected to a radio frequency (RF) signal line. One end of the RF signal line is connected to the conductor sheet, and the other end is connected to an antenna signal source. The bottom end of the hollow tube is connected to a flexible hose, which is also connected to a water pump. This invention provides a large dynamic range for antenna height, good broadband matching, effectively suppresses water supply-side current, and improves the radiation efficiency of the seawater antenna.

Description

Technical Field

[0001] This invention belongs to the field of wireless communication technology, and specifically relates to a magnetic ring isolated seawater antenna device. Background Technology

[0002] Modern unmanned surface vessels (USVs) are characterized by their light weight, small size, and shallow draft. The communication and navigation antennas of USVs are located at the highest point of the mast. With the increasing complexity of communication, navigation, and radar functions, the number and weight of antennas have increased dramatically. The limited platform space also presents a complex electromagnetic compatibility environment.

[0003] By using seawater as the antenna radiator and employing real-time controlled water pumps to regulate the antenna height, dynamic seawater antennas can alleviate the complex electromagnetic compatibility issues of unmanned vessels. Furthermore, when not in use, the water pumps can be shut off, and the antenna's low radar cross-section makes it suitable as a stealth antenna.

[0004] However, current dynamic seawater antennas are inefficient, largely because the feed current flows into the water supply side via the water pump, resulting in low antenna radiation efficiency. For example, patent CN105940555A introduces a quarter-wavelength hollow conductor tube, making the antenna equivalent to a quarter-wavelength short-circuit stub in series, thus suppressing the current on the water supply side. Patent CN110994149A proposes bottom feeding and a side-mounted water pipe, making the antenna equivalent to a parallel short-circuit stub. Both methods can suppress the current on the water supply side, but changes in the antenna radiation frequency require changes in the antenna radiation wavelength, necessitating a change in the short-circuit stub length. Therefore, existing methods are only applicable to fixed operating frequencies, limiting the reconfigurability of seawater antennas. Once the antenna is manufactured, it is difficult to precisely change the short-circuit stub length, resulting in poor broadband matching. Furthermore, high-frequency (shortwave) short-circuit stubs can reach several meters in length, leading to large and complex antennas in the aforementioned existing technologies. Summary of the Invention

[0005] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a magnetic ring isolated seawater antenna device with a large dynamic range of antenna height, good broadband matching, which can effectively suppress the water supply side current and improve the radiation efficiency of the seawater antenna.

[0006] To achieve the above objectives, the present invention provides a magnetic ring isolated seawater antenna device, comprising a magnetic ring, a hollow tube, and a perforated conductor plate;

[0007] The perforated conductor plate has a through hole, and the hollow tube passes through and is connected to the through hole of the perforated conductor plate, or the hollow tube is disposed on the top surface of the perforated conductor plate, and the center of the hollow tube and the center of the through hole of the perforated conductor plate coincide; the perforated conductor plate can float on the sea surface when the seawater antenna device is used.

[0008] A magnetic ring is fitted around the outside of the hollow tube, and epoxy resin is filled around the magnetic ring and between the magnetic ring and the hollow tube to form an encapsulation structure.

[0009] The inner wall of the hollow tube is provided with a conductor sheet, which is connected to a radio frequency signal line. One end of the radio frequency signal line is connected to the conductor sheet, and the other end is connected to an antenna signal source.

[0010] The bottom end of the hollow tube is connected to a flexible hose, which in turn is connected to a water pump.

[0011] As a further improvement of the present invention, a nozzle is installed at the top end of the hollow tube.

[0012] As a further improvement of the present invention, the bottom height of the conductor sheet is higher than the top height of the magnetic ring.

[0013] As a further improvement of the present invention, the height of the hollow tube is greater than the sum of the height of the magnetic ring and the height of the conductor sheet.

[0014] As a further improvement of the present invention, the outer diameter of the flexible tube is the same as the inner diameter of the hollow tube.

[0015] As a further improvement of the present invention, when the hollow tube passes through and connects to the through hole of the perforated conductor plate, the outer diameter of the hollow tube is equal to the diameter of the through hole of the perforated conductor plate.

[0016] When the hollow tube is disposed on the top surface of the perforated conductor plate, the diameter of the through hole of the perforated conductor plate is greater than or equal to the inner diameter of the hollow tube, and the diameter of the through hole of the perforated conductor plate is less than the outer diameter of the hollow tube.

[0017] As a further improvement of the present invention

[0018] The magnetic ring is made of iron powder core or ferrite soft magnetic material; and / or,

[0019] The conductor sheet is made of a conductive metal resistant to seawater corrosion; and / or,

[0020] The hollow tube is made of Teflon, PVC; and / or,

[0021] The perforated conductor plate is made of a conductive metal resistant to seawater corrosion; and / or,

[0022] The hose is made of flexible plastic.

[0023] As a further improvement of the present invention, the nozzle is made of a non-conductive material.

[0024] As a further improvement of the present invention, one or more magnetic rings are provided.

[0025] In summary, the technical solutions conceived by this invention have the following beneficial effects compared with the prior art:

[0026] (1) The magnetic ring-isolated seawater antenna device of the present invention, through the inductive reactance formed by the magnetic ring set on the conductor plate and the choking method of the base magnetic ring, achieves the effect of isolating the upper seawater antenna radiator from the lower seawater. The present invention has a large dynamic range of antenna height, good broadband matching, and can effectively suppress the current on the water supply side, thereby improving the radiation efficiency of the seawater antenna. The present invention has a simple structure and can be used for maritime wireless communication.

[0027] (2) In order to meet the requirements of marine communication and further improve the broadband matching, the magnetic ring isolated seawater antenna device of the present invention can select low-loss nickel-zinc ferrite as the magnetic ring material within a certain frequency band (such as the range of 1MHz to 100MHz).

[0028] (3) The magnetic ring isolated seawater antenna device of the present invention encapsulates the magnetic ring inside the encapsulation structure with epoxy resin, which enables the magnetic ring to not come into direct contact with seawater, and at the same time fixes the magnetic ring and the hollow tube.

[0029] (4) The magnetic ring isolated seawater antenna device of the present invention can improve signal reception by 6 / 7 dBm at the same resonant frequency compared with the antenna without magnetic isolation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the magnetic ring isolated seawater antenna device according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the encapsulated magnetic ring cross-sectional structure of the magnetic ring-isolated seawater antenna device according to an embodiment of the present invention.

[0032] Figure 3 This is the equivalent current diagram of magnetic ring isolation in this embodiment of the invention.

[0033] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1, magnetic ring; 2, packaging structure; 3, radio frequency signal line; 4, conductor sheet; 5, nozzle; 6, hollow tube; 7, perforated conductor plate; 8, flexible tube; 9, water pump. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention 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 and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] As a preferred embodiment of the present invention, the magnetic ring-isolated seawater antenna device of the present invention is suitable for maritime wireless communication. It includes a magnetic ring 1, a hollow tube 6, and a perforated conductor plate 7. The perforated conductor plate 7 has a through hole, through which the hollow tube 6 passes and connects, or the hollow tube 6 is disposed on the top surface of the perforated conductor plate 7, and the centers of the hollow tube 6 and the through hole of the perforated conductor plate 7 coincide. The perforated conductor plate 7 can float on the sea surface when the seawater antenna device is in use. A magnetic ring 1 is sleeved on the outside of the hollow tube 6, and epoxy resin is filled around the outside of the magnetic ring 1 and between the magnetic ring 1 and the hollow tube 6 to form an encapsulation structure 2, thereby encapsulating the magnetic ring 1 inside the encapsulation structure 2, preventing the magnetic ring 1 from directly contacting seawater, and simultaneously fixing the magnetic ring 1 and the hollow tube 6.

[0040] Furthermore, a conductor sheet 4 is provided on the inner wall of the hollow tube 6, and the conductor sheet 4 is connected to the radio frequency signal line 3. Specifically, one end of the radio frequency signal line 3 is connected to the conductor sheet 4, and the other end is connected to the antenna signal source. In this embodiment of the invention, the antenna signal source is not specifically limited; for example, a signal generator commonly used in the art can be used. The function of the conductor sheet 4 is to ensure uniform seawater feeding. The bottom height of the conductor sheet 4 is slightly higher than the top height of the magnetic ring 1, that is, the feeding position is located above the magnetic ring 1, so that the magnetic ring 1 has a choking effect. Preferably, the conductor sheet 4 is made of a conductive metal resistant to seawater corrosion, including but not limited to copper alloys, aluminum alloys, etc. The shape of the conductor sheet 4 is not limited; in this embodiment of the invention, it is preferably ring-shaped.

[0041] Furthermore, a nozzle 5 is installed at the top of the hollow tube 6, and the bottom end of the hollow tube 6 is connected to a flexible hose 8, which in turn is connected to a water pump 9. The flexible hose 8 and the water pump 9 are located in seawater below the perforated conductor plate 7. Seawater flows in from the water pump 9, passes through the flexible hose 8 and the hollow tube 6 in sequence, and finally flows out from the nozzle 5. The nozzle 5 is used to concentrate the dispersed seawater, making the water column shape continuous. Of course, if the radiation energy is concentrated, the nozzle 5 may not be required when the pressure of the water pump 9 is sufficient. Preferably, the nozzle 5 is made of a non-conductive material, such as Teflon plastic. Furthermore, the flexible hose 8 is preferably made of flexible plastic, and its length is not limited. The outer diameter of the flexible hose 8 is preferably the same as the inner diameter of the hollow tube 6 to ensure a tight fit. Furthermore, the water pump 9 is preferably a real-time adjustable water pump, thereby enabling changes in antenna height.

[0042] In a preferred embodiment, the magnetic ring 1 is made of soft magnetic materials such as iron powder core and ferrite. For example, for iron powder core soft magnetic materials, a carbonyl iron powder magnetic ring with low frequency sensitivity is preferred. Since the permeability of iron powder core is generally no more than 100, high-permeability manganese-zinc ferrite is preferred when higher permeability is required. Furthermore, when higher operating frequency is required, such as between 1MHz and 100MHz, low-loss nickel-zinc ferrite can be selected. Those skilled in the art can make selections based on actual needs.

[0043] Furthermore, the inner diameter of the magnetic ring 1 only needs to be larger than the outer diameter of the hollow tube 6, and its outer diameter is not limited. The height and number of magnetic rings 1 are also not limited. In the embodiment shown in the attached figure, one magnetic ring 1 is provided. In other embodiments, multiple magnetic rings 1 can be fitted around the hollow tube 6. Multiple magnetic rings can increase the overall height of the magnetic rings, thereby increasing the inductance.

[0044] More preferably, the height of the hollow tube 6 is slightly greater than the sum of the height of the magnetic ring 1 and the height of the conductor sheet 4, which makes the overall structure of the antenna device more compact and smaller; the hollow tube 6 is preferably made of Teflon or PVC, and its outer diameter is smaller than the inner diameter of the magnetic ring 1.

[0045] More preferably, the diameter of the through hole in the perforated conductor plate 7 is greater than or equal to the inner diameter of the hollow tube 6, and the diameter of the through hole in the perforated conductor plate 7 is less than the outer diameter of the hollow tube 6.

[0046] More preferably, the material of the perforated conductor plate 7 is a conductive metal resistant to seawater corrosion, including but not limited to copper alloys, aluminum alloys, etc., and its shape is not limited.

[0047] The principle of isolation using a magnetic ring in this invention is as follows: by connecting a magnetic ring at the base of the seawater antenna, the inductive reactance formed is isolated between the upper seawater antenna radiator and the lower seawater. This seawater inductance and the magnetic ring exhibit sufficiently large reactance characteristics within the operating frequency range, and their function is equivalent to that of the insulator at the bottom of a typical metal rod monopole antenna. The equivalent circuit diagram is shown below. Figure 3 As shown.

[0048] For magnetic materials: L = A L ×N 2

[0049] In the formula, L is the inductance value; A L The inductance coefficient depends on the material, height, inner and outer diameters of the magnetic ring, as well as the actual operating frequency and temperature. N is the number of coil turns. Since the current passing through the seawater through the magnetic ring and the displacement current radiated by the antenna form an inductance of 1 turn with the magnetic ring, the number of coil turns here is 1.

[0050] Furthermore, due to Where I1 is the current below the feed point, I2 is the signal source current, and I3 is the antenna radiated current. The antenna radiated current I3 needs to be as large as possible. R1 and R2 are the water supply side resistance and the signal source grounding resistance, respectively. X L is the inductance value of the magnetic ring. U is the signal source voltage.

[0051] but

[0052] This shows that the amplitude of I3 varies with the inductance X.L The larger the inductance of magnetic ring 1, the better the isolation effect.

[0053] The seawater antenna device of this invention utilizes the inductive reactance formed by a magnetic ring on a conductor plate and employs a base magnetic ring choke to isolate the upper seawater antenna radiator from the lower seawater. The seawater antenna device of this invention exhibits a large dynamic range of antenna height, which is related to the conductivity of the magnetic ring. It also demonstrates good broadband matching. Even when the antenna height changes (antenna resonant frequency changes), the magnetic ring consistently maintains its ability to suppress the current on the water supply side, thus improving the radiation efficiency of the seawater antenna. Furthermore, within a certain frequency band (e.g., 1MHz to 100MHz), this invention can select low-loss nickel-zinc ferrite as the magnetic ring material, further enhancing broadband matching and adapting to maritime communication requirements.

[0054] In the examples listed below, two methods are compared: one using magnetic ring isolation and the other not using magnetic ring isolation. The reception effect is illustrated using a high-end software-defined wideband receiver based on modern software-defined radio technology, G39DCC. The results are shown in Table 1 below.

[0055] In this specific embodiment, a NaCl solution with a conductivity of 4 S / m is used as the conductive solution to simulate seawater in the experiment; the perforated conductor plate 7 is made of copper sheet, is rectangular in shape, has a circular through hole in the center, is 500 mm long, 500 mm wide, and 0.5 mm thick, and the central circular hole is a circle with a diameter of 40 mm; the magnetic ring 1 is a manganese-zinc magnetic ring with an inner diameter of 57 mm, an outer diameter of 107 mm, a height of 40 mm, and a permeability of 2000. The nozzle 5 has an inlet diameter of 40 mm and an outlet diameter of 18 mm; the hose 8 has an outer diameter of 38 mm; the conductor sheet 4 has a height of 15 mm; the hollow tube 6 is made of PVC, has an inner diameter of 38 mm, an outer diameter of 42 mm, and a height of 60 mm.

[0056] Table 1 Comparison of received field strength with and without magnetic ring isolation.

[0057]

[0058] The results show that at the same resonant frequencies (16MHz, 42MHz, 60MHz), using a magnetic ring can increase the signal receiving field strength by 6 / 7dBm.

[0059] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A magnetically isolated seawater antenna device, characterized in that, Including magnetic rings, hollow tubes, and perforated conductor plates; The perforated conductor plate has a through hole, and the hollow tube passes through and is connected to the through hole of the perforated conductor plate, or the hollow tube is disposed on the top surface of the perforated conductor plate, and the center of the hollow tube and the center of the through hole of the perforated conductor plate coincide; the perforated conductor plate can float on the sea surface when the seawater antenna device is used. A magnetic ring is fitted around the outside of the hollow tube, and epoxy resin is filled around the magnetic ring and between the magnetic ring and the hollow tube to form an encapsulation structure. The inner wall of the hollow tube is provided with a conductor sheet, which is connected to a radio frequency signal line. One end of the radio frequency signal line is connected to the conductor sheet, and the other end is connected to an antenna signal source. The bottom height of the conductor sheet is higher than the top height of the magnetic ring. The bottom end of the hollow tube is connected to a flexible hose, which in turn is connected to a water pump.

2. The magnetic ring-isolated seawater antenna device according to claim 1, characterized in that, A nozzle is installed at the top of the hollow tube.

3. The magnetically isolated seawater antenna device according to claim 1 or 2, characterized in that, The height of the hollow tube is greater than the sum of the height of the magnetic ring and the height of the conductor sheet.

4. The magnetically isolated seawater antenna device according to claim 1 or 2, characterized in that, The outer diameter of the flexible tube is the same as the inner diameter of the hollow tube.

5. The magnetically isolated seawater antenna device according to claim 1 or 2, characterized in that, When the hollow tube passes through and connects to the through hole of the perforated conductor plate, the outer diameter of the hollow tube is equal to the diameter of the through hole of the perforated conductor plate. When the hollow tube is disposed on the top surface of the perforated conductor plate, the diameter of the through hole of the perforated conductor plate is greater than or equal to the inner diameter of the hollow tube, and the diameter of the through hole of the perforated conductor plate is less than the outer diameter of the hollow tube.

6. The magnetically isolated seawater antenna device according to claim 1 or 2, characterized in that, The magnetic ring is made of iron powder core or ferrite soft magnetic material; and / or, The conductor sheet is made of a conductive metal resistant to seawater corrosion; and / or, The hollow tube is made of Teflon, PVC; and / or, The perforated conductor plate is made of a conductive metal resistant to seawater corrosion; and / or, The hose is made of flexible plastic.

7. The magnetic ring-isolated seawater antenna device according to claim 2, characterized in that, The nozzle is made of a non-conductive material.

8. The magnetically isolated seawater antenna device according to claim 1 or 2, characterized in that, One or more magnetic rings are provided.

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