Efficient parallel excitation seawater monopole antenna and wireless communication equipment

Abstract

The invention discloses an efficient parallel excitation seawater monopole antenna and wireless communication equipment, the antenna comprises a seawater monopole, a shunt excitation feed structure, a magnetic ring, a metal floor, a dielectric plate and a power divider feed network, the seawater monopole is arranged in the middle of the shunt excitation feed structure; the metal floor is arranged on the upper surface of the dielectric plate, the power divider feed network is arranged on the lower surface of the dielectric plate, the power divider feed network is used for feeding to the shunt excitation feed structure, and the seawater monopole and the bottom of the shunt excitation feed structure penetrate through the metal floor and are flush with the bottom of the dielectric plate. According to the invention, a shunt excitation feed structure is utilized, the dynamism, high efficiency and good reconfigurable capability of the seawater monopole antenna are realized, and the seawater monopole antenna has the advantages of wide frequency band, simple structure, high radiation efficiency and good reconfigurable capability.

Description

Technical Field

[0001] The present invention relates to an efficient parallel-excitation seawater monopole antenna and a wireless communication device, belonging to the technical field of wireless communication. Background Art

[0002] The establishment of the electromagnetic wave propagation model in the marine environment provides an important support for the construction of a full-coverage marine communication and information system. The high attenuation characteristics of the short-wave and ultra-short-wave frequency bands in seawater pose special requirements for antenna design. Studying the antenna model partially immersed in seawater can help determine the impedance conjugate matching conditions of the underwater part and the above-water part of the antenna, as well as the influence of different water entry depths, insulation layer radii, and relative dielectric constants on the radiation efficiency. For liquid antennas, especially antennas using seawater as a radiator, the characteristics of liquid materials as conductive radiators need to be considered. This kind of monopole antenna is fed by coaxial feeding, and the radiation needle is located inside the liquid. The synthetic field equation needs to be obtained through field analysis techniques and boundary conditions. Currently, most seawater monopole antennas are static antennas, which require an insulator to separate / isolate the water monopole, and usually a plastic pipe is needed to accommodate the water. However, in actual implementation, it is very difficult to carry and assemble such a long pipe. The dynamic seawater monopole antenna has high losses at extremely high frequencies and is not an effective radiator in a thin seawater flow, and the efficiency of the antenna is low. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide an efficient parallel-excitation seawater monopole antenna. This antenna uses a shunt excitation feeding structure to achieve the dynamic performance, high efficiency, and good reconfigurability of the seawater monopole antenna, and has the advantages of a wide frequency band, simple structure, high radiation efficiency, and good reconfigurability.

[0004] Another purpose of the present invention is to provide a wireless communication device including the above antenna.

[0005] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0006] An efficient parallel-excitation seawater monopole antenna includes a seawater monopole, a shunt excitation feeding structure, a magnetic ring, a metal floor, a dielectric board, and a power divider feeding network. The seawater monopole is arranged in the middle of the shunt excitation feeding structure. The metal floor is arranged on the upper surface of the dielectric board. The power divider feeding network is arranged on the lower surface of the dielectric board. The power divider feeding network is used to feed the shunt excitation feeding structure. The bottom of the seawater monopole and the shunt excitation feeding structure passes through the metal floor and is flush with the bottom of the dielectric board.

[0007] Further, the shunt excitation feeding structure includes a conductive tube, a first gamma-shaped feeding arm, and a second gamma-shaped feeding arm. The tops of the first gamma-shaped feeding arm and the second gamma-shaped feeding arm are connected to the conductive tube. The bottoms of the conductive tube, the first gamma-shaped feeding arm, and the second gamma-shaped feeding arm pass through the metal floor and are flush with the bottom of the dielectric plate.

[0008] Further, a first slot, a second slot, and a third slot are provided on the metal floor, and a fourth slot, a fifth slot, and a sixth slot are provided on the dielectric plate;

[0009] The positions of the first slot and the fourth slot correspond to the position of the conductive tube. The positions of the second slot and the fifth slot correspond to the position of the first gamma-shaped feeding arm. The positions of the third slot and the sixth slot correspond to the position of the second gamma-shaped feeding arm.

[0010] Further, the power divider feeding network includes a T-shaped power divider. The T-shaped power divider includes a first microstrip transmission line and a second microstrip transmission line. The first end of the first microstrip transmission line is connected to the excitation port. The second end of the first microstrip transmission line is perpendicularly connected to the center of the second microstrip transmission line. The two ends of the second microstrip transmission line are respectively connected to the shunt excitation feeding structure.

[0011] Further, the power divider feeding network further includes two impedance matching networks, namely a first impedance matching network and a second impedance matching network. The first end of the second microstrip transmission line is connected to the shunt excitation feeding structure through the first impedance matching network. The second end of the second microstrip transmission line is connected to the shunt excitation feeding structure through the second impedance matching network.

[0012] Further, the first impedance matching network includes a third microstrip transmission line, a fourth microstrip transmission line, a first matching capacitor, and a second matching capacitor. The middle of the third microstrip transmission line is slotted into two sections of lines, and the two sections of lines are connected through the first matching capacitor. And the two sections of lines are respectively connected to the first end of the second microstrip transmission line and the shunt excitation feeding structure. The first end of the fourth microstrip transmission line is connected to the third microstrip transmission line through the second matching capacitor. The second end of the fourth microstrip transmission line is connected to the metal floor;

[0013] The second impedance matching network includes a fifth microstrip transmission line, a sixth microstrip transmission line, a third matching capacitor, and a fourth matching capacitor. The middle of the fifth microstrip transmission line is slotted into two sections of lines, and the two sections of lines are connected through the third matching capacitor. And the two sections of lines are respectively connected to the second end of the second microstrip transmission line and the shunt excitation feeding structure. The first end of the sixth microstrip transmission line is connected to the fifth microstrip transmission line through the fourth matching capacitor. The second end of the sixth microstrip transmission line is connected to the metal floor.

[0014] Further, a first metal via hole and a second metal via hole are provided on the dielectric plate. The second end of the fourth microstrip transmission line is connected to the metal floor through the first metal via hole, and the second end of the sixth microstrip transmission line is connected to the metal floor through the second metal via hole.

[0015] Further, the excitation port adopts an SMA connector, and the inner conductor of the SMA connector is connected to the first end of the first microstrip transmission line.

[0016] Further, the magnetic ring is made of QR-8 ferrite material with a dielectric constant of 12, a magnetic permeability of 10, and a magnetic loss of 0.0125.

[0017] Another object of the present invention can be achieved by adopting the following technical solutions:

[0018] A wireless communication device includes the above-mentioned high-efficiency parallel excitation seawater monopole antenna.

[0019] The present invention has the following beneficial effects compared with the prior art:

[0020] 1. The antenna of the present invention uses a shunt excitation feeding structure to feed the seawater monopole structure, making the overall antenna structure symmetric, achieving good omnidirectional performance in the working frequency band of the antenna. The seawater monopole structure with a height of about one-quarter wavelength forms an omnidirectional radiation mode with a first resonance frequency of 16.7 MHz. By adding a matching network, good impedance matching can be obtained, and an omnidirectional radiation mode with a second resonance frequency of 22.9 MHz is introduced. By adjusting the size of the seawater monopole, the first resonance frequency can be adjusted, and by adjusting the capacitance value in the matching network, the second resonance frequency can be adjusted. After adopting the shunt excitation feeding structure, it is convenient to supply the dynamic seawater monopole to achieve high efficiency.

[0021] 2. The working frequency band of the antenna of the present invention is 10 - 30 MHz, with an absolute bandwidth of 45.885%, and the antenna gain is -1.3087 dB. This antenna has the advantages of dynamics, wide frequency band, high radiation efficiency, good reconfigurability, and simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0023] Figure 1 It is a schematic structural diagram of the high-efficiency parallel excitation seawater monopole antenna according to the embodiment of the present invention.

[0024] Figure 2 This is the seawater monopole structure diagram of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0025] Figure 3 This is the shunt-fed structure diagram of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0026] Figure 4 This is the slotted metal floor structure diagram of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0027] Figure 5 This is the slotted dielectric board structure diagram of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0028] Figure 6 This is the power divider feeding network structure diagram of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0029] Figure 7 This is the first impedance matching network structure diagram of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0030] Figure 8 This is the second impedance matching network structure diagram of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0031] Figure 9 This is the main dimension diagram of the seawater monopole of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0032] Figure 10 This is the main dimension diagram of the shunt-fed structure of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0033] Figure 11 This is the main dimension diagram of the power divider feeding network of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0034] Figure 12 This is the reflection coefficient curve diagram of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0035] Figure 13 This is the gain curve diagram of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0036] Figure 14 This is the radiation pattern of the high-efficiency parallel-fed seawater monopole antenna according to an embodiment of the present invention.

[0037] Among them, 100 - seawater monopole, 200 - shunt excitation feeding structure, 201 - conductive tube, 202 - first gamma - shaped feeding arm, 203 - second gamma - shaped feeding arm, 300 - magnetic ring, 400 - metal floor, 401 - first slot, 402 - second slot, 403 - third slot, 500 - dielectric board, 501 - fourth slot, 502 - fifth slot, 503 - sixth slot, 600 - power divider feeding network, 601 - first microstrip transmission line, 602 - second microstrip transmission line, 603 - third microstrip transmission line, 604 - first matching capacitor, 605 - fourth microstrip transmission line, 606 - second matching capacitor, 700 - excitation port. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment:

[0040] As Figure 1 shown, this embodiment provides a highly efficient parallel - excitation seawater monopole antenna, which can be applied to various wireless communication devices. The whole antenna has a symmetrical structure and includes a seawater monopole 100, a shunt excitation feeding structure 200, a magnetic ring 300, a metal floor 400, a dielectric board 500 and a power divider feeding network 600. The seawater monopole 100 is arranged in the middle of the shunt excitation feeding structure 200. The metal floor 400 is arranged on the upper surface of the dielectric board 500. The power divider feeding network 600 is arranged on the lower surface of the dielectric board 500. The power divider feeding network 600 is used to feed the shunt excitation feeding structure 200. The bottom of the seawater monopole 100 and the shunt excitation feeding structure 200 passes through the metal floor 400 and is flush with the bottom of the dielectric board 500.

[0041] As Figures 1 to 2 shown, the seawater monopole 100 adopts a cylindrical structure, and the height of the seawater monopole 100 is about one - quarter wavelength, forming an omnidirectional radiation pattern at the first resonant frequency.

[0042] As Figures 1 to 3As shown, the shunt excitation feeding structure 200 includes a conductive tube 201, a first gamma (Γ)-shaped feeding arm 202, and a second gamma (Γ)-shaped feeding arm 203. The tops of the first gamma-shaped feeding arm 202 and the second gamma-shaped feeding arm 203 are connected to the conductive tube 201. The conductive tube 201, the longitudinal and transverse arms of the first gamma-shaped feeding arm 202, and the longitudinal and transverse arms of the second gamma-shaped feeding arm 203 are all cylindrical structures. The seawater monopole 100, the conductive tube 201, and the magnetic ring 300 are concentric, and the centers are all set at the antenna center. The bottoms of the conductive tube 201, the first gamma-shaped feeding arm 202, and the second gamma-shaped feeding arm 203 serve as the bottom of the shunt excitation feeding structure 200, pass through the metal floor 400, and are flush with the bottom of the dielectric plate 500. After adopting the shunt excitation feeding structure 200, it is convenient to supply the dynamic seawater monopole 100 to achieve high efficiency.

[0043] As Figures 1 to 4 shown, the metal floor 400 is printed on the upper surface of the dielectric plate 500. To enable the bottoms of the conductive tube 201, the first gamma-shaped feeding arm 202, and the second gamma-shaped feeding arm 203 to pass through the metal floor 400, a first slot 401, a second slot 402, and a third slot 403 are provided on the metal floor 400. The position of the first slot 401 corresponds to the position of the conductive tube 201, the position of the second slot 402 corresponds to the position of the first gamma-shaped feeding arm 202, and the position of the third slot 403 corresponds to the position of the second gamma-shaped feeding arm 203. And to match the shapes of the conductive tube 201, the first gamma-shaped feeding arm 202, and the second gamma-shaped feeding arm 203, the first slot 401, the second slot 402, and the third slot 403 are all circular slots. Among them, the first slot 401 is concentric with the conductive tube 201, the second slot 402 is concentric with the longitudinal arm of the first gamma-shaped feeding arm 202, and the third slot 403 is concentric with the second gamma-shaped feeding arm 203.

[0044] As Figures 1 to 3 、 Figure 5As shown, in order to make the bottoms of the conductive tube 201, the first gamma-shaped feeding arm 202, and the second gamma-shaped feeding arm 203 flush with the bottom of the dielectric plate 500, a fourth slot 501, a fifth slot 502, and a sixth slot 503 are provided on the dielectric plate 500. The position of the fourth slot 501 corresponds to the position of the conductive tube 201, the position of the second slot 402 corresponds to the position of the first gamma-shaped feeding arm 202, and the position of the fifth slot 502 corresponds to the position of the second gamma-shaped feeding arm 203. And in order to match the shapes of the conductive tube 201, the first gamma-shaped feeding arm 202, and the second gamma-shaped feeding arm 203, the fourth slot 501, the fifth slot 502, and the sixth slot 503 are all circular slots. Among them, the fourth slot 501 and the conductive tube 201 are concentric, the fifth slot 502 and the longitudinal arm of the first gamma-shaped feeding arm 202 are concentric, and the sixth slot 503 and the second gamma-shaped feeding arm 203 are concentric.

[0045] As Figures 1 to 3 , Figure 6 shown, the power divider feeding network 600 is printed on the lower surface of the dielectric plate 500. It includes a T-shaped power divider. The T-shaped power divider includes a first microstrip transmission line 601 and a second microstrip transmission line 602. The first end of the first microstrip transmission line 601 is connected to the excitation port 700, and the second end of the first microstrip transmission line 601 is perpendicularly connected to the center of the second microstrip transmission line 602 to form a T-shaped structure. The two ends of the second microstrip transmission line 602 are respectively connected to the shunt excitation feeding structure 200, specifically connected to the first gamma-shaped feeding arm 202 and the second gamma-shaped feeding arm 203 respectively.

[0046] Furthermore, the excitation port 700 uses an SMA connector, and the inner conductor of the SMA connector is connected to the first end of the first microstrip transmission line 601.

[0047] Furthermore, the power divider feeding network 600 further includes two impedance matching networks, which are the first impedance matching network and the second impedance matching network respectively. The first end of the second microstrip transmission line 602 is connected to the first gamma-shaped feeding arm 202 of the shunt excitation feeding structure 200 through the first impedance matching network, and the second end of the second microstrip transmission line 602 is connected to the second gamma-shaped feeding arm 203 of the shunt excitation feeding structure 300 through the second impedance matching network. By adding the matching network, good impedance matching can be obtained, and an omnidirectional radiation mode with a second resonant frequency of 22.9 MHz is introduced.

[0048] As Figures 1 to 7As shown in the figure, the first impedance matching network includes a third microstrip transmission line 603, a fourth microstrip transmission line 604, a first matching capacitor 605, and a second matching capacitor 606. The middle of the third microstrip transmission line 603 is slotted into two segments, which are connected by the first matching capacitor 605. And the two segments are respectively connected to the first end of the second microstrip transmission line 602 and the first gamma-shaped feeding arm 202 of the shunt excitation feeding structure 200. The first end of the fourth microstrip transmission line 604 is connected to the third microstrip transmission line 603 through the second matching capacitor 606, and the second end of the fourth microstrip transmission line 604 is connected to the metal floor 400.

[0049] As Figures 1 to 6 , Figure 8 shown in the figure, the second impedance matching network includes a fifth microstrip transmission line 607, a sixth microstrip transmission line 608, a third matching capacitor 609, and a fourth matching capacitor 610. The middle of the fifth microstrip transmission line 607 is slotted into two segments, which are connected by the third matching capacitor. And the two segments are respectively connected to the second end of the second microstrip transmission line 602 and the second gamma-shaped feeding arm 203 of the shunt excitation feeding structure 300. The first end of the sixth microstrip transmission line 608 is connected to the fifth microstrip transmission line 607 through the fourth matching capacitor 610, and the second end of the sixth microstrip transmission line 608 is connected to the metal floor 400.

[0050] Furthermore, in order to connect the second end of the fourth microstrip transmission line 604 to the metal floor 400 and the second end of the sixth microstrip transmission line 608 to the metal floor 400, a first metal via 504 and a second metal via 505 are provided on the dielectric substrate 500. The second end of the fourth microstrip transmission line 604 is connected to the metal floor 400 through the first metal via 504, and the second end of the sixth microstrip transmission line 608 is connected to the metal floor 400 through the second metal via 505.

[0051] In this embodiment, the magnetic ring 300 is made of ferrite material, specifically, the QR-8 ferrite material with a dielectric constant of 12, a magnetic permeability of 10, and a magnetic loss of 0.0125 can be used; the dielectric substrate 500 is made of FR-4 material with a dielectric constant of 4.4 and a loss tangent value of 0.02.

[0052] As Figure 9 shown in the figure, it is the main dimension diagram of the seawater monopole in this embodiment. The height H1 of the seawater monopole is 3580 mm, and the diameter is 130 mm.

[0053] As Figure 10As shown, it is the main dimension diagram of the shunt excitation feeding structure of this embodiment. The height H2 of the conductive tube is 306.6 mm, the inner diameter D2 is 130 mm, the outer diameter D3 is 140 mm, the transverse arm length H3 of the gamma-shaped feeding arm is 165 mm, the diameter D4 is 60 mm, the longitudinal arm height H4 is 231.6 mm, the diameter D4 is 60 mm, the height H5 of the magnetic ring is 200 mm, the inner diameter D5 is 150 mm, and the outer diameter D6 is 330 mm.

[0054] As Figure 11 shown, it is the main dimension diagram of the power divider feeding network of this embodiment. The length L1 of the first microstrip transmission line is 200 mm, the width w1 is 1 mm, the length L2 of the second microstrip transmission line is 391 mm, the width W2 is 9 mm, the length L3 of the third microstrip transmission line is 195 mm, the width W3 is 9 mm, the length L4 of the fourth microstrip transmission line is 54.5 mm, the width W4 is 9 mm, the dimensions of the fifth microstrip transmission line are the same as those of the third microstrip transmission line, and the dimensions of the sixth microstrip transmission line are the same as those of the fourth microstrip transmission line.

[0055] As Figures 12 to 14 shown, they are respectively the reflection coefficient curve graph, gain curve graph and radiation pattern of the high-efficiency parallel excitation seawater monopole antenna of this embodiment. It can be seen that the operating frequency band of the antenna is 10 - 30 MHz, the gain of the antenna is -1.3087 dB, and the antenna has the advantages of dynamics, wide frequency band, high radiation efficiency, good reconfigurability and simple structure, etc.

[0056] In summary, the antenna of the present invention uses a shunt excitation feeding structure to feed the seawater monopole structure, making the overall antenna a symmetric structure, realizing good omnidirectional performance in the operating frequency band of the antenna. The seawater monopole structure with a height of about one-quarter wavelength forms an omnidirectional radiation mode with a first resonance frequency of 16.7 MHz. Good impedance matching can be obtained by adding a matching network, and an omnidirectional radiation mode with a second resonance frequency of 22.9 MHz is introduced. The first resonance frequency can be adjusted by adjusting the size of the seawater monopole, and the second resonance frequency can be adjusted by adjusting the capacitance value in the matching network. After adopting the shunt excitation feeding structure, it is convenient to supply the dynamic seawater monopole to achieve high efficiency.

[0057] Although the present invention has been described herein in connection with embodiments, however, in the process of implementing the claimed invention, those skilled in the art can understand and realize other variations of the disclosed embodiments by viewing the drawings, the disclosure content, and the like. In the specification, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude a plurality of cases. Certain measures are recited in different embodiments, but this does not mean that these measures cannot be combined to produce good effects.

[0058] Although the present invention has been described in connection with specific features and their embodiments, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the invention. Accordingly, the present specification and the drawings are merely exemplary illustrations of the invention and are considered to cover any and all modifications, variations, combinations or equivalents within the scope of the invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the present invention fall within the scope of the present invention and its equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A high-efficiency parallel-excited seawater monopole antenna, characterized in that: It includes a seawater monopole, a shunt excitation feeding structure, a magnetic ring, a metal floor, a dielectric plate and a power divider feeding network. The seawater monopole is arranged in the middle of the shunt excitation feeding structure, the metal floor is arranged on the upper surface of the dielectric plate, the power divider feeding network is arranged on the lower surface of the dielectric plate, the power divider feeding network is used to feed the shunt excitation feeding structure, and the bottom of the seawater monopole and the shunt excitation feeding structure passes through the metal floor and is flush with the bottom of the dielectric plate.

2. The high-efficiency parallel-excited seawater monopole antenna according to claim 1, characterized in that: The shunt excitation feeding structure includes a conductive tube, a first gamma-shaped feeding arm and a second gamma-shaped feeding arm, the tops of the first gamma-shaped feeding arm and the second gamma-shaped feeding arm are connected to the conductive tube, and the bottoms of the conductive tube, the first gamma-shaped feeding arm and the second gamma-shaped feeding arm pass through the metal floor and are flush with the bottom of the dielectric plate.

3. The high-efficiency parallel-excited seawater monopole antenna according to claim 2, characterized in that: The metal floor is provided with a first slot, a second slot and a third slot, and the dielectric plate is provided with a fourth slot, a fifth slot and a sixth slot; The positions of the first slot and the fourth slot correspond to the position of the conductive tube, the positions of the second slot and the fifth slot correspond to the position of the first gamma-shaped feeding arm, and the positions of the third slot and the sixth slot correspond to the position of the second gamma-shaped feeding arm.

4. The high-efficiency parallel-excited seawater monopole antenna according to claim 1, characterized in that: The power divider feeding network includes a T-shaped power divider, and the T-shaped power divider includes a first microstrip transmission line and a second microstrip transmission line. The first end of the first microstrip transmission line is connected to the excitation port, the second end of the first microstrip transmission line is vertically connected to the center of the second microstrip transmission line, and the two ends of the second microstrip transmission line are respectively connected to the shunt excitation feeding structure.

5. The high-efficiency parallel-excited seawater monopole antenna according to claim 4, characterized in that: The power divider feeding network also includes two impedance matching networks, which are respectively a first impedance matching network and a second impedance matching network. The first end of the second microstrip transmission line is connected to the shunt excitation feeding structure through the first impedance matching network, and the second end of the second microstrip transmission line is connected to the shunt excitation feeding structure through the second impedance matching network.

6. The high-efficiency parallel-excited seawater monopole antenna according to claim 5, characterized in that: The first impedance matching network includes a third microstrip transmission line, a fourth microstrip transmission line, a first matching capacitor and a second matching capacitor. The third microstrip transmission line is divided into two segments by a slot in the middle. The two segments are connected by a first matching capacitor, and the two segments are respectively connected to the first end of the second microstrip transmission line and the shunt excitation feeding structure. The first end of the fourth microstrip transmission line is connected to the third microstrip transmission line through the second matching capacitor, and the second end of the fourth microstrip transmission line is connected to the metal floor. The second impedance matching network includes a fifth microstrip transmission line, a sixth microstrip transmission line, a third matching capacitor and a fourth matching capacitor. The fifth microstrip transmission line is divided into two sections by a slot in the middle. The two sections are connected by a third matching capacitor, and the two sections are respectively connected to the second end of the second microstrip transmission line and the shunt excitation feeding structure. The first end of the sixth microstrip transmission line is connected to the fifth microstrip transmission line through the fourth matching capacitor, and the second end of the sixth microstrip transmission line is connected to the metal floor.

7. The high-efficiency parallel-excited seawater monopole antenna according to claim 6, characterized in that: The dielectric board is provided with a first metal via and a second metal via. The second end of the fourth microstrip transmission line is connected to the metal floor through the first metal via. The second end of the sixth microstrip transmission line is connected to the metal floor through the second metal via.

8. The high-efficiency parallel-excited seawater monopole antenna according to any one of claims 4 to 7, characterized in that: The excitation port adopts an SMA connector, and the inner conductor of the SMA connector is connected to the first end of the first microstrip transmission line.

9. The high-efficiency parallel-excited seawater monopole antenna according to any one of claims 1 to 7, characterized in that: The magnetic ring is made of QR-8 ferrite material with a dielectric constant of 12, a magnetic permeability of 10, and a magnetic loss of 0.0125.

10. A wireless communication device, characterized in that: It comprises the high-efficiency parallel-excited seawater monopole antenna as described in any one of claims 1-9.

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