Seawater antenna device isolated by magnetic ring

Abstract

The invention discloses a seawater antenna device isolated by a magnetic ring, which belongs to the technical field of wireless communication and comprises the magnetic ring, a hollow tube and a conductor plate with holes. The perforated conductor plate is provided with a through hole, the hollow pipe penetrates through the through hole of the perforated conductor plate and is connected with the perforated conductor plate, or the hollow pipe is arranged on the top surface of the perforated conductor plate, and the circle center of the hollow pipe coincides with the circle center of the through hole of the perforated conductor plate; the porous conductor plate can float on the sea surface; a magnetic ring is sleeved outside the hollow pipe, and epoxy resin is filled outside the magnetic ring and between the magnetic ring and the hollow pipe to form a packaging structure; a conductor sheet is arranged on the inner wall of the hollow pipe and connected with a radio frequency signal line, one end of the radio frequency signal line is connected with the conductor sheet, and the other end of the radio frequency signal line is connected with an antenna signal source. The bottom end of the hollow pipe is connected with a hose which is connected with a water pump. The dynamic range of the height of the antenna is large, the broadband matching performance is good, water supply side current can be effectively restrained, and the radiation efficiency of the seawater antenna is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wireless communications, and in particular relates to a seawater antenna device with magnetic ring isolation. Background Art

[0002] Modern unmanned marine ships are characterized by light weight, small size and shallow draft. The communication and navigation antennas of unmanned marine ships are located at the highest point of the mast. Faced with the growing complex functions such as communication, navigation, and radar, the number and weight of antennas have increased dramatically. The narrow platform space faces a complex electromagnetic compatibility environment.

[0003] By using seawater as the antenna radiator and using a real-time control water pump to control the antenna height, the dynamic seawater antenna can alleviate the complex electromagnetic compatibility issues of unmanned ships. At the same time, when the dynamic seawater antenna is not in use, the water pump can be turned off. It has the characteristics of low radar scattering cross section and can be used as a stealth antenna.

[0004] However, the current dynamic seawater antenna is inefficient. One important reason is that the feeding current will flow into the water supply side with the water pump, making the antenna radiation efficiency low. For example, the patent with publication number CN105940555A introduces a quarter-wavelength hollow conductor tube, which makes the antenna equivalent to a quarter-wavelength short-circuit branch in series, thereby curbing the current on the water supply side of the antenna. The patent with publication number CN110994149A proposes bottom feeding and the introduction of a water pipe on the side, making the antenna equivalent to a parallel short-circuit branch. Both methods can curb the current on the water supply side, but due to the change in the antenna radiation frequency, the antenna radiation wavelength can change, which requires the length of the short-circuit branch tube to change. Therefore, the method of the prior art is only applicable to fixed operating frequencies, which limits the reconfigurability of the seawater antenna. After the antenna is manufactured, it is difficult to accurately change the length of the short-circuit branch, and the broadband matching is poor. In addition, the high-frequency (short-wave) short-circuit branch tube can reach several meters, so the antenna in the above-mentioned prior art is large and complex in structure. Summary of the invention

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

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

[0007] The perforated conductor plate has a through hole, the hollow tube passes through the through hole of the perforated conductor plate and is connected thereto, or the hollow tube is arranged on the top surface of the perforated conductor plate, and the center of the hollow tube and the through hole of the perforated conductor plate coincide with each other; the perforated conductor plate can float on the sea surface when the seawater antenna device is in use;

[0008] The outer part of the hollow tube is sleeved with a magnetic ring, and the outer part of the magnetic ring and the space between the magnetic ring and the hollow tube are filled with epoxy resin to form a packaging structure;

[0009] The inner wall of the hollow tube is provided with a conductive sheet, the conductive sheet is connected to the radio frequency signal line, one end of the radio frequency signal line is connected to the conductive sheet, and the other end is connected to the antenna signal source;

[0010] The bottom end of the hollow tube is connected to a hose, and the hose 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 hose 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 the through hole of the perforated conductor plate and is connected thereto, 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 arranged 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 smaller than the outer diameter of the hollow tube.

[0017] As a further improvement of the present invention,

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

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

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

[0021] The material of the perforated conductor plate is 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 non-conductive material.

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

[0025] In general, the above technical solution conceived by the present invention has the following beneficial effects compared with the prior art:

[0026] (1) The magnetic ring-isolated seawater antenna device of the present invention uses the inductive reactance formed by the magnetic ring set on the conductor plate and the base magnetic ring choke to isolate the upper seawater antenna radiator and the lower seawater. The antenna height of the present invention has a large dynamic range and good broadband matching, which can effectively curb the current on the water supply side and improve the radiation efficiency of the seawater antenna. The present invention has a simple structure and can be used for wireless communications at sea.

[0027] (2) To meet the requirements of marine communications, the magnetic ring-isolated seawater antenna device of the present invention further improves broadband matching. Low-loss nickel-zinc ferrite can be selected as the magnetic ring material within a certain frequency band (such as within the range of 1 MHz to 100 MHz).

[0028] (3) The seawater antenna device with magnetic ring isolation of the present invention uses epoxy resin to encapsulate the magnetic ring inside the packaging structure, so that the magnetic ring does not come into direct contact with the seawater, and at the same time the magnetic ring and the hollow tube are fixed.

[0029] (4) The seawater antenna device with magnetic ring isolation of the present invention can improve the signal reception by 6 / 7dBm compared with the antenna without magnetic isolation at the same resonant frequency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 2 Schematic diagram of the cross-sectional structure of the packaged magnetic ring involved in the seawater antenna device with magnetic ring isolation according to an embodiment of the present invention

[0032] Figure 3 1 is an equivalent current diagram of magnetic ring isolation in an embodiment of the present invention.

[0033] In all the drawings, the same figure marks represent 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. hose; 9. water pump. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] As a preferred embodiment of the present invention, the seawater antenna device with magnetic ring isolation of the embodiment of the present invention is suitable for marine wireless communication, which includes a magnetic ring 1, a hollow tube 6, and a perforated conductor plate 7; wherein the perforated conductor plate 7 has a through hole, and the hollow tube 6 passes through the through hole of the perforated conductor plate 7 and is connected thereto, or the hollow tube 6 is arranged on the top surface of the perforated conductor plate 7, and the centers of the through holes of the hollow tube 6 and the perforated conductor plate 7 coincide; the perforated conductor plate 7 can float on the sea surface when the seawater antenna device is used. The outer part of the hollow tube 6 is provided with a magnetic ring 1, and the outer part of the magnetic ring 1 and the space between the magnetic ring 1 and the hollow tube 6 are filled with epoxy resin to form a packaging structure 2, so that the magnetic ring 1 is packaged inside the packaging structure 2, so that the magnetic ring 1 is not in direct contact with the seawater, and the magnetic ring 1 and the hollow tube 6 are fixed at the same time.

[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 RF signal line 3. Specifically, one end of the RF signal line 3 is connected to the conductor sheet 4, and the other end is connected to the antenna signal source. The antenna signal source is not specifically limited in the embodiment of the present invention. For example, a signal generator commonly used in the field can be used. The function of the conductor sheet 4 is to make the seawater feed uniform. 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 material of the conductor sheet 4 is a conductive metal resistant to seawater corrosion, including but not limited to copper alloy, aluminum alloy, etc. The shape of the conductor sheet 4 is not limited, and it is preferably ring-shaped in the embodiment of the present invention.

[0041] Furthermore, a nozzle 5 is installed at the top of the hollow tube 6, and the bottom of the hollow tube 6 is connected to a hose 8, and the hose 8 is connected to a water pump 9. The hose 8 and the water pump 9 are located in the seawater below the perforated conductor plate 7. The seawater flows in from the water pump 9, passes through the hose 8 and the hollow tube 6 in sequence, and finally flows out from the nozzle 5. Among them, the nozzle 5 is used to spray the dispersed seawater in a concentrated manner so that the shape of the water column is continuous. Of course, if the radiation energy is concentrated, the nozzle 5 may not be provided 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 material of the hose 8 is preferably flexible plastic, the length of the hose 8 is not limited, and the outer diameter of the hose 8 is preferably the same as the inner diameter of the hollow tube 6 so that it fits tightly. Furthermore, the water pump 9 is preferably a real-time adjustable water pump, so as to achieve the change of the antenna height.

[0042] In a preferred embodiment, the material of the magnetic ring 1 is selected from soft magnetic materials such as iron powder core and ferrite. For example, for the iron powder core soft magnetic material, it is preferred to use -8 material carbonyl iron powder magnetic ring which is less affected by frequency. Since the magnetic permeability of the iron powder core is generally not more than 100, when there are higher requirements for the magnetic permeability, it is preferred to use manganese zinc ferrite with high magnetic permeability. In addition, when there are higher requirements for the operating frequency, for example, if the operating frequency is required to be between 1MHz and 100MHz, low-loss nickel zinc ferrite can be selected. Those skilled in the art can make a choice according to actual needs.

[0043] In addition, the inner diameter of the magnetic ring 1 only needs to be larger than the outer diameter of the hollow tube 6, and the outer diameter is not limited, and the height and number of the magnetic ring 1 are not limited. In the embodiment shown in the drawings, one magnetic ring 1 is provided, and in other embodiments, multiple magnetic rings 1 can be provided outside the hollow tube 6, and multiple magnetic rings can increase the overall height of the magnetic rings, thereby increasing the inductance.

[0044] Further preferably, the height of the hollow tube 6 is slightly larger than the sum of the height of the magnetic ring 1 and the height of the conductor sheet 4, so that the overall structure of the antenna device is compact and more miniaturized; the material of the hollow tube 6 is preferably Teflon or PVC, and its outer diameter is smaller than the inner diameter of the magnetic ring 1.

[0045] Further preferably, the diameter of the through hole of 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 of the perforated conductor plate 7 is smaller than the outer diameter of the hollow tube 6 .

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

[0047] The principle of the present invention using a magnetic ring for isolation is: by connecting a magnetic ring at the root of the seawater antenna to form an inductive reactance, the upper seawater antenna radiator and the lower seawater are isolated. The seawater inductance and the magnetic ring show a sufficiently large reactance characteristic within the operating frequency range, and their role is equivalent to the role of the insulator at the bottom of an ordinary metal rod monopole antenna. Its equivalent circuit diagram is shown in the figure below. Figure 3 shown.

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

[0049] Where L is the inductance value; A L is the inductance, which depends on the material, height, inner and outer diameters of the magnetic ring, as well as the actual working frequency, temperature, etc.; N is the number of coil turns. Since the current of the seawater passing 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 feeding point, I2 is the signal source current, and I3 is the antenna radiation current. The antenna radiation 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. L is the inductance of the magnetic ring. U is the signal source voltage.

[0051] but

[0052] It can be seen from this that the amplitude of I3 varies with the inductance XL Therefore, the greater the inductance value formed by the magnetic ring 1, the better the isolation effect.

[0053] The seawater antenna device of the embodiment of the present invention uses the inductive reactance formed by the magnetic ring set on the conductor plate and adopts the base magnetic ring choke method to isolate the upper seawater antenna radiator and the lower seawater; the seawater antenna device of the present invention has a large dynamic range of antenna height, which is related to the conductivity of the magnetic ring, and has good broadband matching. When the antenna height changes (the antenna resonant frequency changes), its magnetic ring always maintains the effect of curbing the current on the water supply side, thereby improving the radiation efficiency of the seawater antenna. In addition, the present invention can select low-loss nickel-zinc ferrite as the magnetic ring material within a certain frequency band (such as within the range of 1MHz to 100MHz), which can further improve broadband matching and meet the requirements of marine communications.

[0054] In the following examples, a comparison is made between using magnetic ring isolation and not using magnetic ring isolation, and a G39DCC high-end software-based wide-band receiver based on modern software radio technology is used for reception to illustrate the reception effect. The results are shown in Table 1 below.

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

[0056] Table 1 Comparison results of receiving field strength with and without magnetic ring isolation

[0057]

[0058] The results show that at the same resonant frequency (16MHz, 42MHz, 60MHz), the use of magnetic rings can increase the signal reception field strength by 6 / 7dBm.

[0059] It will be easily understood by those skilled in the art that the above description is only 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 in the protection scope of the present invention.

Claims

1. A seawater antenna device with magnetic ring isolation, characterized in that: Including magnetic ring, hollow tube, conductor plate with holes; The perforated conductor plate has a through hole, the hollow tube passes through the through hole of the perforated conductor plate and is connected thereto, or the hollow tube is arranged on the top surface of the perforated conductor plate, and the center of the hollow tube and the through hole of the perforated conductor plate coincide with each other; the perforated conductor plate can float on the sea surface when the seawater antenna device is in use; The outer part of the hollow tube is sleeved with a magnetic ring, and the outer part of the magnetic ring and the space between the magnetic ring and the hollow tube are filled with epoxy resin to form a packaging structure; The inner wall of the hollow tube is provided with a conductive sheet, the conductive sheet is connected to the radio frequency signal line, one end of the radio frequency signal line is connected to the conductive sheet, and the other end is connected to the antenna signal source; The bottom end of the hollow tube is connected to a hose, and the hose is connected to a water pump.

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

3. The seawater antenna device with magnetic ring isolation according to claim 1, characterized in that: The bottom height of the conductor sheet is higher than the top height of the magnetic ring.

4. The seawater antenna device with magnetic ring isolation according to any one of claims 1 to 3, 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.

5. The seawater antenna device with magnetic ring isolation according to any one of claims 1 to 3, characterized in that: The outer diameter of the hose is the same as the inner diameter of the hollow tube.

6. The seawater antenna device with magnetic ring isolation according to any one of claims 1 to 3, characterized in that: When the hollow tube passes through the through hole of the perforated conductor plate and is connected thereto, 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 arranged 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 smaller than the outer diameter of the hollow tube.

7. The seawater antenna device with magnetic ring isolation according to any one of claims 1 to 3, characterized in that: The material of the magnetic ring is iron powder core or ferrite soft magnetic material; and / or, The conductor sheet is made of a conductive metal that is resistant to seawater corrosion; and / or, The hollow tube is made of Teflon or PVC; and / or, The material of the perforated conductor plate is a conductive metal resistant to seawater corrosion; and / or, The hose is made of flexible plastic.

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

9. The seawater antenna device with magnetic ring isolation according to any one of claims 1 to 3, characterized in that: The magnetic ring is provided in one or more forms.

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