CN211957913U

CN211957913U - Monopole antenna

Info

Publication number: CN211957913U
Application number: CN202021001842.6U
Authority: CN
Inventors: 刘若鹏; 赵治亚; 沈艳芳
Original assignee: Xi'an Guangqi Advanced Technology Research Institute
Current assignee: Shenzhen Guangqi High End Equipment Technology Research And Development Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2020-11-17
Anticipated expiration: 2030-06-04

Abstract

The utility model discloses a monopole antenna. The monopole antenna includes: the radiator comprises a feed end; and the metal floor is provided with a groove structure at the position corresponding to the feed end, and at least one part of the feed end extends into the inner space of the groove structure. The utility model discloses a monopole antenna has formed groove structure in metal floor, and this groove structure produces new resonance point at the high-frequency band, has improved monopole antenna's impedance characteristic, has improved monopole antenna's octave to this groove structure's simple structure is favorable to reducing the research and development cost and the debugging cost of product.

Description

Monopole antenna

Technical Field

The utility model relates to an antenna technology field, more specifically relates to a monopole antenna.

Background

At present, in radio frequency systems such as airborne, vehicle-mounted, high-speed mobile data communication transmission, ground anti-interference communication, measurement and control tracking and the like, in order to expand wireless communication distance and suppress multipath interference of ground communication, and simultaneously meet the characteristics of miniaturization, simple and convenient manufacturing and installation and the like, the design of a novel antenna with vertical polarization, wide-band operation and excellent omnidirectional radiation characteristic is increasingly important. The monopole antenna is widely applied to practice as an omnidirectional antenna due to good reliability, high stability, simple structure and lower cost.

In a radio frequency system of a wireless communication device, once the impedance of an antenna is mismatched with the impedance on a radio frequency feeder, energy transmitted on the feeder is reflected, and the problem of energy waste is caused. In the prior art, an impedance matching circuit is usually arranged in an antenna to improve the impedance matching characteristic of the antenna in a wide frequency band, but the introduction of components not only reduces the reliability of the antenna, but also increases the development cost and debugging cycle cost of the product.

Therefore, further improvements to the monopole antenna of the prior art are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a monopole antenna, so as to improve the impedance matching characteristics of the monopole antenna in a wide frequency band.

According to an aspect of the utility model, a monopole antenna is provided, include: a radiator comprising a feed end; and a groove structure is arranged at the position of the metal floor corresponding to the feed end, and at least one part of the feed end extends into the inner space of the groove structure.

Preferably, the cross-sectional shape of the groove structure is rectangular, arched or polygonal.

Preferably, the groove structure is symmetrical along the central axis.

Preferably, the radiating body is of a symmetrical structure along the central axis, and the symmetrical axis coincides with the central axis of the groove structure.

Preferably, the method further comprises the following steps: the top loading plate and the metal floor are parallel to each other, the feed end is formed at a first end of the radiator, a second end of the radiator is connected with the top loading plate, and the first end and the second end are opposite to each other.

Preferably, the radiator has a symmetrical structure along a central axis defined by a line between the midpoint of the first end and the midpoint of the second end.

Preferably, the central axis of the radiator passes through the midpoint of the top load plate and is perpendicular to the top load plate.

Preferably, the width of the radiator is varied in a manner of increasing and then decreasing in a direction along the central axis.

Preferably, the metal floor further comprises: the through hole penetrates through the metal floor, the position of the through hole corresponds to that of the groove structure, and the size of the through hole is smaller than that of the groove structure.

Preferably, the metal floor has a trapezoidal cross section.

The utility model provides a monopole antenna has formed groove structure in metal floor, and this groove structure produces new resonance point at the high-frequency band, has improved monopole antenna's impedance characteristic, has improved monopole antenna's octave, and furtherly, this groove structure's simple structure is favorable to reducing the research and development cost and the debugging cost of product.

Furthermore, in various monopole antennas with different working frequency bands, the impedance matching characteristic of the monopole antenna can be improved by forming groove structures with different shapes and different volumes.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 shows a perspective view of a monopole antenna according to an embodiment of the invention;

fig. 2 shows a front view of a monopole antenna according to an embodiment of the invention;

fig. 3 shows a graph of scattering parameters for a monopole antenna according to an embodiment of the invention;

fig. 4 shows a gain curve of a monopole antenna according to an embodiment of the invention.

List of reference numerals

100 monopole antenna

110 top loading plate

120 radiator

121 feeding end

130 metal floor

131 groove structure

132 dielectric material

Detailed Description

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.

In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples.

Fig. 1 shows a perspective view of a monopole antenna according to an embodiment of the invention; fig. 2 shows a front view of a monopole antenna according to an embodiment of the invention.

As shown in fig. 1 and 2, the monopole antenna 100 includes a radiator 120 and a metal ground 130 for converting a high-frequency oscillation signal into electromagnetic wave radiation or converting received electromagnetic wave radiation into a high-frequency oscillation signal. In this embodiment, the radiator 120 includes a feeding terminal 121, a groove structure 131 is disposed at a position of the metal ground 130 corresponding to the feeding terminal 121, and at least a portion of the feeding terminal 121 extends into an inner space of the groove structure 131. Optionally, the groove structure 131 is a symmetrical structure along the central axis; the radiator 120 is symmetrical along the central axis, and the symmetrical axis coincides with the central axis of the groove structure 131.

As one example, the monopole antenna 100 also includes a top load plate 110. In this embodiment, the top load plate 110 and the metal floor 130 are disposed opposite to each other, the radiator 120 is located between the top load plate 110 and the metal floor 130, a first end of the radiator 120 forms a feeding terminal 121, a second end is connected to the top load plate 110, the first end and the second end are opposite to each other, the metal floor 130 has a groove structure 131 at a position corresponding to the feeding terminal 121, and at least a portion of the feeding terminal 121 extends into an inner space of the groove structure 131.

The top load plate 110 is, for example, rectangular, and the top load plate 110 is preferably disposed parallel to the metal floor 130. The top loading plate 110 is used to distribute loading capacitance, which is beneficial to improving the impedance matching of the antenna, widening the bandwidth of the low frequency band, and reducing the overall height of the antenna. The width of the top loading plate 110 is preferably 0.03 λ, where λ is the wavelength corresponding to the lower limit frequency of the operating band.

The radiator 120 is used to provide radiation and is connected to the top load plate 110 through a second end. Preferably, the radiator 120 has an axisymmetric structure with a line connecting the first end midpoint and the second end midpoint as a central axis. Optionally, the central axis of the radiator 120 passes through the middle point of the top load plate 110 and is perpendicular to the top load plate 110, and the central axis is distributed along the z direction. In this embodiment, the radiator 120 has different widths in the x direction, and optionally, the width of the radiator 120 is varied in a manner that increases and then decreases in a direction along the central axis. For example, referring to fig. 2, the width of the middle portion of the radiator 120 is greater than the width of the first end and the width of the second end, and the width of the first end is less than the width of the second end, and two trapezoidal radiator structures are formed from the widest portion of the radiator 120 to the first end and the second end, respectively. The operating frequency band of the monopole antenna 100 is controlled by at least the shape of the radiator 120.

The metal floor 130 is used to provide a ground plane for adjusting the radiation field parameters of the monopole antenna 100. In this embodiment, the cross-sectional shape of the metal floor 130 in the xz plane is trapezoidal, and in alternate embodiments, the shape and size of the metal floor 130 may be varied according to the desired radiation field parameters of the monopole antenna 100.

In this embodiment, the metal ground 130 has a groove structure 131 at a position corresponding to the feeding terminal 121, and at least a portion of the feeding terminal 121 of the radiator 120 extends into an inner space of the groove structure 131. A dielectric material 132 is filled between the groove structure 131 and the feeding end 121, and the dielectric material 132 is preferably polytetrafluoroethylene. Preferably, the groove structure 131, the metal floor 130, the radiator 120, and the top loading plate 110 coincide with a central axis in the z-direction and have an axisymmetric structure along the central axis.

In this embodiment, the groove structure 131 is a rectangular parallelepiped having a length in the x, y, z directions of about 2cm, 1.5cm, 4cm, respectively, and in alternative embodiments, the groove structure 131 has a rectangular, arched, arcuate, or polygonal cross-sectional shape in the xz plane. The shape and volume of the groove structure 131 are respectively adapted to the operating frequency band of the monopole antenna 100, that is, in a plurality of monopole antennas 100 having different operating frequency bands, the groove structure 131 having different shapes and/or different volumes may be disposed in the metal floor 130 to improve the impedance matching characteristic of the monopole antenna 100.

In this embodiment, the material of the metal floor 130 is selected from, for example, aluminum, copper, silver, and any combination thereof. Preferably, in the metal floor 130, a material of a portion adjacent to the groove structure 131 is aluminum to improve the high power capacity characteristic of the monopole antenna 100.

In one or more embodiments, the metal floor 130 further includes a via (not shown) penetrating the metal floor 130, the location of the via corresponding to the location of the groove structure 131 to provide a path for a power feed line to be connected to the feeding terminal 121.

Compared with the traditional monopole antenna, the utility model discloses a monopole antenna 100 has formed the groove structure 131 that is used for improving the impedance matching characteristic in metal floor 130 and the corresponding position of feed end 121, can show the impedance matching characteristic of improving monopole antenna 100 in the wide band to the octave bandwidth is greater than 3.5. Further, the groove structure 131 of the monopole antenna 100 is simple and easy to implement, which is beneficial to reducing the development cost and the debugging cost of the product. Further, for example, the groove structure 131 is formed on the surface of the metal floor 130 by using an etching process, thereby avoiding increasing the complexity of the antenna structure and the complexity of the process, and ensuring the high reliability of the antenna without damaging the miniaturization of the antenna.

Fig. 3 shows a graph of scattering parameters for a monopole antenna according to an embodiment of the invention; fig. 4 shows a gain curve of a monopole antenna according to an embodiment of the invention.

As shown in fig. 3, a graph of the S11 parameter for a monopole antenna is shown, with the S11 parameter being one of a plurality of scattering parameters characterizing the return loss characteristics of the antenna. It can be seen from fig. 3 that, the utility model discloses a work of this design antenna of monopole antenna is at VHF (Very High Frequency,30Mhz-300MHz) and UHF (Ultra High Frequency, 300) 3000MHz) Frequency channel, under the no matching network condition, through form groove structure in metal floor, the S11 parameter has reached and has been less than-30 Db, the impedance matching characteristic of monopole antenna in the broadband scope has been obviously improved, octave bandwidth is greater than 3.5, greatly reduced monopole antenna' S return loss. As shown in fig. 4, the monopole antenna has about 2dB up to about 4dB at 150MHz to 750MHz, and has good radiation characteristics.

In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A monopole antenna, comprising:

a radiator comprising a feed end; and

the metal floor is provided with a groove structure at the position corresponding to the feed end, and at least one part of the feed end extends into the inner space of the groove structure.

2. The monopole antenna of claim 1 wherein said groove structure has a cross-sectional shape that is rectangular, arcuate, or polygonal.

3. The monopole antenna of claim 2 wherein said groove structure is symmetrical along a central axis.

4. The monopole antenna of claim 3 wherein said radiator is symmetrical along a central axis and the axis of symmetry coincides with the central axis of said slot structure.

5. The monopole antenna of claim 1, further comprising: the top of the loading plate is provided with a loading plate,

the top loading plate and the metal floor are parallel to each other, the feed end is formed at a first end of the radiator, a second end of the radiator is connected with the top loading plate, and the first end and the second end are opposite to each other.

6. The monopole antenna of claim 5, wherein the radiator has a symmetrical configuration about a central axis that is a line connecting the midpoint of the first end and the midpoint of the second end.

7. The monopole antenna of claim 6, wherein a central axis of said radiator passes through a midpoint of said top load plate and is perpendicular to said top load plate.

8. The monopole antenna of claim 7, wherein a width of said radiator varies in an increasing and decreasing manner along said central axis.

9. The monopole antenna of claim 1, wherein said metal floor further comprises: the through hole penetrates through the metal floor, the position of the through hole corresponds to that of the groove structure, and the size of the through hole is smaller than that of the groove structure.

10. The monopole antenna of claim 9, wherein said metal floor is trapezoidal in cross-section.