CN114843759A

CN114843759A - Monopole water antenna

Info

Publication number: CN114843759A
Application number: CN202210282695.1A
Authority: CN
Inventors: 华昌洲; 张宇新; 黄雪琴; 陈益; 姜菲; 刘锦剑; 王健
Original assignee: Ningbo University
Current assignee: Ningbo University
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2022-08-02
Anticipated expiration: 2042-03-22
Also published as: CN114843759B

Abstract

The invention discloses a monopole water antenna, which comprises a coaxial cable, a metal bottom plate, a Teflon base, a first water tank, a second water tank and four arc-shaped water arms, wherein the Teflon base is positioned above the metal bottom plate, the lower end surface of the Teflon base is attached to the upper end surface of the metal bottom plate, the first water tank is realized by arranging a cylindrical cavity on a cylinder main body, the cylinder main body is positioned above the Teflon base, the lower end surface of the cylinder main body is attached to the upper end surface of the Teflon base, an inner core of the coaxial cable sequentially penetrates through the metal bottom plate, the Teflon base and the bottom of the cylinder main body and then enters the cylindrical cavity, the second water tank is realized by arranging a truncated cone cavity on the truncated cone main body, the small end of the truncated cone main body is attached to the upper end face of the cylindrical main body, four through holes communicated with the truncated cone cavity are uniformly arranged on the side wall of the truncated cone main body at intervals along a circle, and four arc-shaped water arms are correspondingly arranged at the four through holes one by one; the omnidirectional radiation antenna has the advantages of simple structure and capability of realizing omnidirectional radiation in two working frequency bands.

Description

Monopole water antenna

Technical Field

The invention relates to a water antenna, in particular to a monopole water antenna.

Background

Water is one of the essential substances in our lives and plays an important role in daily life. The water has the characteristics of easy acquisition, transparency, fluidity and the like. Compared with the traditional antenna, the water antenna designed based on the water characteristic not only has low cost and convenient access, but also has the characteristics of concealment and emergency response, and is popular in recent years.

The existing monopole water antenna is loaded with water with two different conductivities of seawater and purified water, the seawater and the purified water respectively realize one frequency band work, and never realize dual-frequency band work, wherein the first working frequency band realized by the seawater is a wifi frequency band (2.420-2.4835 GHz) and is used for indoor communication, and the second working frequency band realized by the purified water is an emergency communication frequency band (1.544-1.646GHz) and is used for communication in case of emergency. However, because the existing monopole water antenna needs to load seawater and pure water at the same time, it needs to design the radiation structures of seawater and pure water respectively, so that the structure is relatively complex, and meanwhile, the water columns formed in the radiation structures of seawater and pure water are all cylinders, so that the radiation directions in two frequency bands are not omnidirectional radiation.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a monopole water antenna which is simple in structure and can realize omnidirectional radiation in two working frequency bands.

The technical scheme adopted by the invention for solving the technical problems is as follows: a monopole water antenna comprises a coaxial cable, a metal base plate, a Teflon base, a first water tank, a second water tank and four identical arc water arms, wherein the arc water arms are realized by adopting arc water pipes with openings at the upper ends and closed lower ends, the metal base plate is a circular plate with the radius of 30mm, the Teflon base is cylindrical and is positioned above the metal base plate, the Teflon base is coaxial with the metal base plate, the lower end surface of the Teflon base is attached to the upper end surface of the metal base plate, the radius of the Teflon base is smaller than that of the metal base plate, the first water tank is realized by arranging a cylindrical cavity on the cylinder body, the cylindrical cavity is coaxial with the cylinder body, the upper end surface of the cylindrical cavity is flush with the upper end surface of the cylinder body, the height of the cylindrical cavity is equal to that of the cylinder body, the radius of the cylindrical cavity is smaller than that of the cylinder body by 3mm, the cylinder body is positioned above the Teflon base, the cylinder body is coaxial with the Teflon base, the lower end face of the cylinder body is attached to the upper end face of the Teflon base, the Teflon base seals the lower end face of the cylinder body, the radius of the cylinder body is smaller than that of the Teflon base, an inner core of a coaxial cable sequentially penetrates through the metal bottom plate, the Teflon base and the bottom of the cylinder body and then enters the cylindrical cavity, the second water tank is realized by arranging a cone platform cavity on the cone platform body, and the cone platform body is provided with a large head end and a small head end, the radius of the small head end of the truncated cone main body is equal to the radius of the cylindrical main body, the small head end of the truncated cone main body is positioned below the large head end of the truncated cone main body, the truncated cone main body is coaxial with the cylindrical main body, the small head end of the truncated cone main body is attached to the upper end face of the cylindrical main body, the truncated cone cavity is coaxial with the truncated cone main body, the truncated cone cavity is provided with a large head end and a small head end, the small head end of the truncated cone cavity is flush with the small head end of the truncated cone main body, the large head end of the truncated cone cavity is flush with the large head end of the truncated cone main body, the truncated cone cavity is coaxial with the truncated cone main body, the radius of the small head end of the truncated cone cavity is equal to the radius of the cylindrical cavity, four through holes communicated with the truncated cone cavity are uniformly arranged on the side wall of the truncated cone main body along a circle at intervals, the four arc-shaped water arms are correspondingly arranged at the four through holes one by one, and are communicated with the cavity of the cone frustum; the thickness of the side wall of the arc-shaped water arm is 2mm, and the thickness of the closed part at the lower end of the arc-shaped water arm is 1 mm; recording an included angle between the arc-shaped water arm and the metal bottom plate as alpha, wherein the value range of the alpha is 45-60 degrees; recording the height of the Teflon base as H1, the value range of H1 as 1-4mm, the height of the inner core of the coaxial cable entering the cylindrical cavity as H2, the value range of H2 as 8-12mm, the height of the cylindrical cavity as H3, the value range of H3 as 45-65mm, the distance from the center of the through hole to the plane of the lower end face of the metal bottom plate as H4, the value range of H4 as 55-65mm, the height of the cone table main body as H5, the value range of H5 as 15-25mm, the radius of the metal bottom plate as R1, the value range of R1 as 20-60mm, the inner diameter of the arc water arm as R2, the value range of R2 as 1-1.5mm, the outer diameter of the arc water arm as 3-3.5mm, the value range of R3 as D1 mm, the diameter of D1 is 6-8mm, the diameter of the cylindrical main body is recorded as D2, the diameter of D2 is recorded as 4-6mm, the diameter of the big head end of the truncated cone cavity is recorded as D3, the diameter of D3 is recorded as 10-16mm, the diameter of the big head end of the truncated cone main body is recorded as D4, and the diameter of D4 is recorded as 20-30 mm.

The material of the metal bottom plate is copper, the materials of the cylindrical main body, the truncated cone main body and the four arc-shaped water arms are all dielectric constant of 2.75, loss of all the materials is 0.023D printing material washed xc11122, the diameter of the coaxial cable core with alpha being 56.5 degrees is 1.27mm, H1 being 1mm, H2 being 10mm, H3 being 50mm, H4 being 61.5mm, H5 being 20mm, R1 being 30mm, R2 being 1mm, R3 being 3mm, D1 being 6mm, D2 being 14mm, D3 being 14mm, and D4 being 28 mm.

Compared with the prior art, the invention has the advantages that the monopole water antenna is formed by the coaxial cable, the metal bottom plate, the Teflon base, the first water tank, the second water tank and the four identical arc-shaped water arms, the arc-shaped water arms are realized by adopting the arc-shaped water pipes, the first water tank is realized by arranging the cylindrical cavity on the cylindrical main body, the second water tank is realized by arranging the cone-frustum cavity on the cone-frustum main body, when the monopole water antenna works, the first water tank, the second water tank and the four arc-shaped water arms are filled with purified water, the coaxial cable is connected with external excitation electromagnetic waves, the electromagnetic waves enable most of the excitation electromagnetic waves to be gathered at the bottom of the first water tank through the Telfon base and further to be transmitted outwards through the first water tank, the second water tank and the four arc-shaped water arms in sequence, and in the transmission process of the electromagnetic waves, the transmission boundary of the electromagnetic waves is changed due to the size change of the first water tank and the second water tank, and then two working frequency bands of a wifi frequency band and an emergency communication frequency band are generated, under the matching of the four arc-shaped water arms, electromagnetic waves can enter the arc-shaped water arms to radiate outwards after passing through the first water tank and the second water tank, so that the radiation directions in the two working frequency bands can be compensated, and the two working frequency bands can realize omnidirectional radiation.

Drawings

Fig. 1 is a perspective view of a monopole water antenna of the present invention;

fig. 2 is an exploded view of the monopole water antenna of the present invention;

fig. 3 is a cross-sectional view of a monopole water antenna of the present invention;

FIG. 4 is a return loss diagram of the monopole water antenna of the invention at two resonance points of 1.68GHz and 2.51 GHz;

FIG. 5 is a two-dimensional gain pattern for a monopole water antenna of the present invention at a 1.68GHz resonance point;

fig. 6 is a two-dimensional gain pattern of the monopole water antenna of the present invention at the 2.51GHz resonance point.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Example (b): as shown in fig. 1 to 3, a monopole water antenna comprises a coaxial cable 1, a metal base plate 2, a Teflon base 3, a first water tank 4, a second water tank 5 and four identical arc-shaped water arms 6, wherein the arc-shaped water arms 6 are realized by arc-shaped water pipes with openings at the upper ends and closed lower ends, the metal base plate 2 is a circular plate with the radius of 30mm, the Teflon base 3 is cylindrical, the Teflon base 3 is positioned above the metal base plate 2, the Teflon base 3 is coaxial with the metal base plate 2, the lower end surface of the Teflon base 3 is attached to the upper end surface of the metal base plate 2, the radius of the Teflon base 3 is smaller than that of the metal base plate 2, the first water tank 4 is realized by arranging a cylindrical cavity 42 on the cylinder body 41, the cylindrical cavity 42 is coaxial with the cylinder body 41, the upper end surface of the cylindrical cavity 42 is flush with the upper end surface of the cylinder body 41, the height of the cylindrical cavity 42 is equal to that of the cylinder body 41, the radius of the cylindrical cavity 42 is 3mm smaller than that of the cylinder body 41, the cylinder body 41 is positioned above the Teflon base 3, the cylinder body 41 and the Teflon base 3 are coaxial, the lower end face of the cylinder body 41 is attached to the upper end face of the Teflon base 3, the lower end face of the cylinder body 41 is sealed by the Teflon base 3, the radius of the cylinder body 41 is smaller than that of the Teflon base 3, an inner core of the coaxial cable 1 sequentially penetrates through the metal base plate 2, the Teflon base 3 and the bottom of the cylinder body 41 and then enters the cylindrical cavity 42, the second water tank 5 is realized by arranging a cone frustum cavity 52 on the cone frustum body 51, the cone frustum body 51 is provided with a large head end and a small head end, the radius of the small head end of the cone frustum body 51 is equal to that of the cylindrical body, the small head end of the cone frustum body 51 is positioned below the large head end, the cone frustum body 51 is coaxial with the cylindrical body, the small head end of the cone frustum body 51 is attached to the upper end face of the cylindrical body, the truncated cone cavity 52 is coaxial with the truncated cone main body 51, the truncated cone cavity 52 has a big head end and a small head end, the small head end of the truncated cone cavity 52 is flush with the small head end of the truncated cone main body 51, the big head end of the truncated cone cavity 52 is flush with the big head end of the truncated cone main body 51, the truncated cone cavity 52 is coaxial with the truncated cone main body 51, the radius of the small head end of the truncated cone cavity 52 is equal to the radius of the cylindrical cavity 42, four through holes communicated with the truncated cone cavity 52 are uniformly arranged on the side wall of the truncated cone main body 51 at intervals along a circle, the four arc-shaped water arms 6 are correspondingly arranged at four through holes one by one, and the four arc-shaped water arms 6 are communicated with the truncated cone cavity 52; the thickness of the side wall of the arc-shaped water arm 6 is 2 mm; the thickness of the sealing position of the lower end of the arc-shaped water arm 6 is 1 mm; recording an included angle between the arc-shaped water arm 6 and the metal bottom plate 2 as alpha, wherein the value range of the alpha is 45-60 degrees; recording the height of the Teflon base 3 as H1, the value range of H1 as 1-4mm, the height of an inner core of the coaxial cable 1 entering the cylindrical cavity 42 as H2, the value range of H2 as 8-12mm, the height of the cylindrical cavity 42 as H3, the value range of H3 as 45-65mm, the distance from the center of the through hole to the plane of the lower end face of the metal bottom plate 2 as H4, the value range of H4 as 55-65mm, the height of the cone table main body 51 as H5, the value range of H5 as 15-25mm, the radius of the metal bottom plate 2 as R1, the value range of R1 as 20-60mm, the inner diameter of the arc water arm 6 as R2, the value range of R2 as 1-1.5mm, the outer diameter of the arc water arm 6 as R3 as 3-3.5mm, the diameter of the cylindrical cavity 42 as D1, and the value range of D1 as 6-8mm, the diameter of the cylindrical main body is recorded as D2, the value range of D2 is 4-6mm, the diameter of the large head end of the truncated cone cavity 52 is recorded as D3, the value range of D3 is 10-16mm, the diameter of the large head end of the truncated cone main body 51 is recorded as D4, and the value range of D4 is 20-30 mm.

In this embodiment, the metal base plate 2 is made of copper, the cylindrical body, the truncated cone body 51 and the four arc-shaped water arms 6 are made of materials having a dielectric constant of 2.75, a loss of 0.023D printed material water milled xc11122, a ═ 56.5 ° coaxial cable 1 core having a diameter of 1.27mm, H1 ═ 1mm, H2 ═ 10mm, H3 ═ 50mm, H4 ═ 61.5mm, H5 ═ 20mm, R1 ═ 30mm, R2 ═ 1mm, R3 ═ 3mm, D1 ═ 6mm, D2 ═ 14mm, D3 ═ 14mm, and D4 ═ 28 mm. The emergency communication device has the advantages of meeting the requirements of emergency communication frequency bands and wifi frequency bands, having the requirement of omnidirectional radiation, and being small in size.

The return loss diagrams of the monopole water antenna in the wifi frequency band and the emergency communication frequency band are shown in fig. 4, and the analysis of fig. 4 shows that: the maximum return loss frequency of the invention in two working frequency bands is respectively corresponding to 1.68GHz and 2.51GHz, the-10 dB working bandwidth is 1.53GHz-1.94GHz when 1.68GHz, the absolute bandwidth is 410MHz, the-10 dB working bandwidth is 2.34GHz-2.60GHz when 2.51GHz, the absolute bandwidth is 260MHz, the maximum gain corresponding to the maximum return loss frequency is respectively 1.6dBi and 2.3dBi, and the depth is respectively-24.9 dB and-19.6 dB. Therefore, the invention can well meet the working requirements of two working frequency bands.

The two-dimensional gain directional pattern of the monopole water antenna of the invention under the frequency of 1.68GHz is shown in figure 5, and the two-dimensional gain directional pattern of the monopole water antenna of the invention under the frequency point of 2.51GHz is shown in figure 6, wherein E _ Plane is a yoz surface in a 3D coordinate, and H _ Plane is an xoy surface in the 3D coordinate. As can be seen from the analysis of fig. 5 and 6: the maximum return loss frequencies respectively corresponding to the two working frequency bands are respectively 1.68Hz and 2.51Hz, and the maximum gain values are respectively 1.6dBi and 2.3 dBi. Therefore, the invention has higher gain on the basis of realizing omnidirectional radiation.

Claims

1. A monopole water antenna is characterized by comprising a coaxial cable, a metal bottom plate, a Teflon base, a first water tank, a second water tank and four identical arc-shaped water arms, wherein the arc-shaped water arms are realized by arc-shaped water pipes with openings at the upper ends and closed lower ends, the metal bottom plate is a circular plate with the radius of 30mm, the Teflon base is cylindrical and is positioned above the metal bottom plate, the Teflon base is coaxial with the metal bottom plate, the lower end surface of the Teflon base is attached to the upper end surface of the metal bottom plate, the radius of the Teflon base is smaller than that of the metal bottom plate, the first water tank is realized by arranging a cylindrical cavity on the cylinder body, the cylindrical cavity is coaxial with the cylinder body, and the upper end surface of the cylindrical cavity is flush with the upper end surface of the cylinder body, the height of the cylindrical cavity is equal to that of the cylinder body, the radius of the cylindrical cavity is smaller than that of the cylinder body by 3mm, the cylinder body is positioned above the Teflon base, the cylinder body is coaxial with the Teflon base, the lower end face of the cylinder body is attached to the upper end face of the Teflon base, the Teflon base seals the lower end face of the cylinder body, the radius of the cylinder body is smaller than that of the Teflon base, an inner core of a coaxial cable sequentially penetrates through the metal bottom plate, the Teflon base and the bottom of the cylinder body and then enters the cylindrical cavity, the second water tank is realized by arranging a cone platform cavity on the cone platform body, and the cone platform body is provided with a large head end and a small head end, the radius of the small head end of the truncated cone main body is equal to the radius of the cylindrical main body, the small head end of the truncated cone main body is positioned below the large head end of the truncated cone main body, the truncated cone main body is coaxial with the cylindrical main body, the small head end of the truncated cone main body is attached to the upper end face of the cylindrical main body, the truncated cone cavity is coaxial with the truncated cone main body, the truncated cone cavity is provided with a large head end and a small head end, the small head end of the truncated cone cavity is flush with the small head end of the truncated cone main body, the large head end of the truncated cone cavity is flush with the large head end of the truncated cone main body, the truncated cone cavity is coaxial with the truncated cone main body, the radius of the small head end of the truncated cone cavity is equal to the radius of the cylindrical cavity, four through holes communicated with the truncated cone cavity are uniformly arranged on the side wall of the truncated cone main body along a circle at intervals, the four arc-shaped water arms are correspondingly arranged at the four through holes one by one, and are communicated with the cavity of the cone frustum; the thickness of the side wall of the arc-shaped water arm is 2mm, and the thickness of the closed part at the lower end of the arc-shaped water arm is 1 mm;

recording an included angle between the arc-shaped water arm and the metal bottom plate as alpha, wherein the value range of the alpha is 45-60 degrees; recording the height of the Teflon base as H1, the value range of H1 as 1-4mm, the height of the inner core of the coaxial cable entering the cylindrical cavity as H2, the value range of H2 as 8-12mm, the height of the cylindrical cavity as H3, the value range of H3 as 45-65mm, the distance from the center of the through hole to the plane of the lower end face of the metal bottom plate as H4, the value range of H4 as 55-65mm, the height of the cone table main body as H5, the value range of H5 as 15-25mm, the radius of the metal bottom plate as R1, the value range of R1 as 20-60mm, the inner diameter of the arc water arm as R2, the value range of R2 as 1-1.5mm, the outer diameter of the arc water arm as 3-3.5mm, the value range of R3 as D1 mm, the diameter of D1 is 6-8mm, the diameter of the cylindrical main body is recorded as D2, the diameter of D2 is recorded as 4-6mm, the diameter of the big head end of the truncated cone cavity is recorded as D3, the diameter of D3 is recorded as 10-16mm, the diameter of the big head end of the truncated cone main body is recorded as D4, and the diameter of D4 is recorded as 20-30 mm.

2. The monopole water antenna as claimed in claim 1, wherein the metal base plate is made of copper, the cylindrical body, the truncated cone body and the four arc-shaped water arms are made of printed materials with dielectric constant of 2.75 and loss of 0.023D, the coaxial cable core with diameter of 56.5 ° is 1.27mm, H1 is 1mm, H2 is 10mm, H3 is 50mm, H4 is 61.5mm, H5 is 20mm, R1 is 30mm, R2 is 1mm, R3 is 3mm, D1 is 6mm, D2 is 14mm, D3 is 14mm, and D4 is 28 mm.