CN113964497B

CN113964497B - Hidden null-fill omnidirectional antenna

Info

Publication number: CN113964497B
Application number: CN202111263402.7A
Authority: CN
Inventors: 李澍; 丁祥军; 孙健; 陈健; 孔彬彬
Original assignee: Jiangsu Hengxin Technology Co Ltd; Jiangsu Hengxin Wireless Technology Co Ltd
Current assignee: Jiangsu Hengxin Technology Co Ltd; Jiangsu Hengxin Wireless Technology Co Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2023-01-06
Anticipated expiration: 2041-10-28
Also published as: CN113964497A

Abstract

The invention relates to a hidden null-fill omnidirectional antenna, which comprises: a reflector; the radiation assembly is arranged on the upper side of the reflector and comprises a monopole and a conductive spiral body, the monopole is vertically arranged, the lower end of the conductive spiral body is electrically connected with the lower end of the monopole, the conductive spiral body is arranged around the monopole, and the rotating diameter of the conductive spiral body is larger than the outer diameter of the monopole; wherein the conductive spiral radiates along the axial direction thereof to generate a vertically upward electric field. The antenna fills the zero point generated by the monopole in the vertical direction, can better realize indoor signal coverage and is convenient for antenna layout.

Description

Hidden null-fill omnidirectional antenna

Technical Field

The invention relates to the technical field of mobile communication antennas, in particular to a hidden zero-point filling omnidirectional antenna.

Background

With the development of mobile communication technology, the coverage of communication signals by modern mobile communication systems is more demanding. A small omnidirectional antenna is essential for mobile communication in a closed environment such as indoors as a supplement to an antenna of a conventional communication base station or the like.

In order to meet the requirement of indoor communication on horizontal signal coverage, a monopole antenna structure is generally adopted as a structural scheme of an indoor antenna. The structure has the characteristic of wide signal coverage in the horizontal direction.

However, due to the physical characteristics of the monopole antenna, a communication null point is generated in the vertical direction of the antenna, that is, no communication signal is located directly below the antenna layout, which adversely affects indoor signal coverage and antenna layout.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the technical defect that the communication zero point is generated in the vertical direction of the antenna in the prior art to influence the communication.

In order to solve the above technical problem, the present invention provides a hidden null-fill omnidirectional antenna, including:

a reflector;

the radiation assembly is arranged on the upper side of the reflector and comprises a monopole and a conductive spiral body, the monopole is vertically arranged, the lower end of the conductive spiral body is electrically connected with the lower end of the monopole, the conductive spiral body is arranged around the monopole, and the rotating diameter of the conductive spiral body is larger than the outer diameter of the monopole;

wherein the conductive spiral radiates along its axis to generate a vertically upward electric field.

Preferably, the length of the monopole is 1/4 wavelength, and the length of the conductive spiral body which surrounds one circle is 0.8-1.3 wavelength.

Preferably, the reflector is a bowl-shaped reflector, the opening of the bowl-shaped reflector is arranged upwards, the radiation component is arranged at the center of the bowl-shaped reflector, and the bowl-shaped reflector extends outwards to form a dish-shaped edge.

Preferably, the antenna cover is arranged on the reflector to form a cavity, and the radiation component is arranged in the cavity.

Preferably, the conductive spiral body is connected with the monopole through a connecting piece.

Preferably, the monopole antenna also comprises a coaxial connector, wherein a through hole is formed in the middle of the reflector, and the coaxial connector is arranged in the through hole in a penetrating mode and is electrically connected with the lower end of the monopole.

Preferably, the radiation module further comprises a limiting member, and the radiation module is clamped in the through hole through the limiting member.

Preferably, the device further comprises a fixing column, and the lower end of the limiting part is in threaded connection with the fixing column.

Preferably, a plurality of isolation blocks are arranged on the upper side of the limiting part and distributed in the circumferential direction around the central axis of the limiting part, the inner side wall of each isolation block is abutted to the corresponding monopole, and the outer side wall of each isolation block is abutted to the corresponding conductive helical body.

Preferably, the number of turns of the conductive spiral body is 2-3.

Compared with the prior art, the technical scheme of the invention has the following advantages:

1. in the invention, due to the existence of the conductive spiral body, the conductive spiral body can radiate in the axial direction of the monopole to generate a vertically upward electric field, thereby filling the zero point generated by the monopole in the vertical direction.

2. The invention can better realize indoor signal coverage and is convenient for antenna layout.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

fig. 2 is a schematic structural diagram of the antenna with the radome removed;

fig. 3 is a schematic structural diagram of a radiation assembly, a limiting member and a fixing column;

FIG. 4 is a schematic diagram of the structure of the conductive spiral, the monopole and the connecting piece;

fig. 5 is a schematic diagram illustrating the operation principle of the omnidirectional antenna of the present invention;

FIG. 6 is a diagram of directivity coefficients obtained by CST simulation of the antenna of the present invention and a conventional antenna;

fig. 7 is a schematic view of the antenna mounted on a ceiling.

The specification reference numbers indicate: 10. a reflector; 11. an antenna cover; 30. a monopole; 31. a conductive spiral body; 32. a connecting member; 40. a stopper; 401. an isolation block; 41. fixing a column; 42. mounting a nut; 50. a coaxial connector; 60. a suspended ceiling.

Detailed Description

The present invention is further described below in conjunction with the drawings and the embodiments so that those skilled in the art can better understand the present invention and can carry out the present invention, but the embodiments are not to be construed as limiting the present invention.

Referring to fig. 1 to 7, the present invention discloses a concealed null-fill omnidirectional antenna, which includes a reflector 10 and a radiation assembly.

The reflector 10 is used to reflect the signal. The radiation assembly is arranged on the upper side of the reflector 10, the radiation assembly comprises a monopole 30 and a conductive spiral body 31, the monopole 30 is vertically arranged, the lower end of the conductive spiral body 31 is electrically connected with the lower end part of the monopole 30, the conductive spiral body 31 is arranged around the monopole 30, and the rotating diameter of the conductive spiral body 31 is larger than the outer diameter of the monopole 30; wherein the conductive spiral 31 radiates along its axial direction to generate a vertically upward electric field.

When the conventional monopole 30 operates, a communication zero point is generated in the vertical direction of the antenna, i.e., no communication signal is present directly below the antenna layout, which adversely affects the indoor signal coverage and the antenna layout. In the present invention, due to the existence of the conductive spiral body 31, it can radiate in the axial direction of the monopole 30, generating a vertically upward electric field, thereby filling the zero point generated in the vertical direction by the monopole 30.

Preferably, the monopole 30 has a longitudinal dimension of 1/4 wavelength, and the conductive spiral 31 has a length of 0.8-1.3 wavelength around one circle. In this state, the conductive spiral 31 can well fill the zero point generated in the vertical direction by the monopole 30.

The reflector 10 is a bowl-shaped reflector 10, the opening of the bowl-shaped reflector 10 is arranged upwards, and the radiation assembly is arranged at the center of the bowl-shaped reflector 10. The bowl-shaped reflector 10 is better able to reflect the signal generated by the radiating element, with better symmetry and uniformity.

The bowl-shaped reflector 10 is made of metal, and the bowl-shaped reflector 10 extends outwards to form a dish-shaped edge, which can improve the influence of the bowl-shaped reflector 10 on the horizontal directivity coefficient of the antenna and is used for the overall installation and fixation of the antenna. The combination of the bowl-shaped reflector and the dish-shaped edge facilitates the installation and layout of the antenna.

The invention further comprises an antenna housing 11, the antenna housing 11 is covered on the reflector 10 to form a cavity, and the radiation component is arranged in the cavity. The radome 11 may be made of PVC, which may protect the whole antenna.

The conductive spiral body 31 is connected with the monopole 30 through a connecting piece 32. The connecting member 32 can realize the electrical connection between the conductive spiral body 31 and the monopole 30, and the connecting member 32 and the monopole 30 can be fixed by welding or clamping. The connecting member 32 may be made of a conductive metal material.

The invention further comprises a coaxial connector 50, wherein a through hole is formed in the middle of the reflector 10, and the coaxial connector 50 penetrates through the through hole and is electrically connected with the lower end of the monopole 30.

The invention further comprises a limiting piece 40, and the radiation assembly is clamped in the through hole through the limiting piece 40. The limiting member 40 is made of plastic, and can be used for mounting and fixing the radiation component. The invention also comprises a fixed column 41, and the lower end part of the limiting part 40 is in threaded connection with the fixed column 41. The fixing post 41 can be sleeved with a mounting nut 42, so that the antenna can be conveniently mounted.

A plurality of isolation blocks 401 are arranged on the upper side of the limiting member 40, the isolation blocks 401 are distributed around the circumference direction of the central axis of the limiting member 40, the inner side wall of each isolation block 401 is abutted to the monopole 30, and the outer side wall of each isolation block 401 is abutted to the conductive screw 31. Through the arrangement of the isolation block 401, the conductive screw 31 and the monopole 30 can be relatively fixed, and good coaxiality between the conductive screw 31 and the monopole 30 is ensured, so that the antenna is ensured to transmit uniform, stable and symmetrical signals.

When the number of turns of the conductive spiral 31 is 2-3 turns, the vertical upward electric field generated by the conductive spiral 31 can better fill the zero point generated by the monopole 30 in the vertical direction.

Fig. 5 is a schematic diagram illustrating the operation of the hidden zero-filling monopole 30 antenna according to the present invention. When the monopole 30 has a longitudinal dimension of 1/4 wavelength, the electric field of the monopole 30 goes from the monopole 30 end to the bowl-mounted reflector 10, creating a null at the vertical position. The conductive spiral 31 is axially radiated when the circumference of the conductive spiral is 0.8-1.3 of the wavelength, and generates a vertically upward electric field, thereby filling the zero point generated by the monopole 30 in the vertical direction.

Fig. 6 is a directivity coefficient diagram of a hidden null-fill omni-directional antenna according to the present invention obtained through CST simulation, wherein the solid line is the radiation pattern of the conventional monopole 30, and the dotted line is the radiation pattern of the antenna according to the present invention. The conventional monopole 30 radiation pattern a shows that it produces a null at the phi i =0 degree position. The hidden null-fill omnidirectional antenna radiation pattern B of the present invention shows that the null generated by the conventional monopole 30 at the position ph i =0 degrees is filled to more than 0dBi, and it has a wide beam characteristic with a directivity coefficient of more than 0dBi in the range ph i = +/-82 degrees.

As shown in fig. 7, the dish-shaped edge and the antenna housing 11 of the hidden type null-fill omnidirectional antenna of the present invention have small thickness, and are embedded in the indoor ceiling 60 by screws. Compared with the traditional monopole 30, the antenna is completely exposed and arranged below the suspended ceiling 60, so that the layout and installation are more convenient.

In summary, the null-fill omnidirectional antenna provided by the invention effectively improves the problem that a null exists in the vertical direction of the existing omnidirectional antenna through an innovative design, and plays a key role in solving signal coverage and antenna layout in a closed space.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Various other modifications and alterations will occur to those skilled in the art upon reading the foregoing description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A concealed null-fill omni directional antenna, comprising:

a reflector;

wherein the conductive spiral body radiates along the axial direction thereof to generate a vertically upward electric field;

the length of the monopole is 1/4 wavelength, and the length of the conductive spiral body surrounding one circle is 0.8-1.3 wavelength.

2. The hidden null-fill omnidirectional antenna of claim 1, wherein the reflector is a bowl-shaped reflector, wherein the opening of the bowl-shaped reflector is disposed upward, wherein the radiating element is disposed at the center of the bowl-shaped reflector, and wherein the bowl-shaped reflector extends outward to form a dish-shaped rim.

3. The concealed null-fill omnidirectional antenna of claim 2, further comprising a radome, the antenna cover disposed over the reflector to form a cavity, the radiating assembly disposed within the cavity.

4. The concealed null-fill omnidirectional antenna of claim 1, wherein the conductive spiral and the monopole are connected by a connector.

5. The hidden null-fill omnidirectional antenna of claim 1, further comprising a coaxial connector, wherein a through hole is formed in the middle of the reflector, and the coaxial connector is inserted into the through hole and electrically connected to the lower end of the monopole.

6. The hidden null-fill omnidirectional antenna of claim 5, further comprising a stop, wherein the radiating element is captured within the through hole by the stop.

7. The hidden null-fill omnidirectional antenna of claim 6, further comprising a fixed post, wherein a lower end of the stop is in threaded connection with the fixed post.

8. The hidden zero-filling omnidirectional antenna according to claim 6, wherein a plurality of spacers are disposed on an upper side of the position-limiting element, the spacers are distributed around a circumferential direction of a central axis of the position-limiting element, an inner sidewall of each spacer abuts against the monopole, and an outer sidewall of each spacer abuts against the conductive helix.

9. The concealed null-fill omnidirectional antenna of claim 1, wherein the number of turns of the conductive spiral is 2-3.