CN112993575B - WiFi omnidirectional antenna - Google Patents
WiFi omnidirectional antenna Download PDFInfo
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- CN112993575B CN112993575B CN202110179579.2A CN202110179579A CN112993575B CN 112993575 B CN112993575 B CN 112993575B CN 202110179579 A CN202110179579 A CN 202110179579A CN 112993575 B CN112993575 B CN 112993575B
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- 230000005855 radiation Effects 0.000 claims abstract description 108
- 239000000758 substrate Substances 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 14
- 238000005388 cross polarization Methods 0.000 description 5
- 230000010287 polarization Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
Abstract
The invention provides a WiFi omnidirectional antenna, which comprises a dielectric substrate, a first antenna and a second antenna, wherein the dielectric substrate is provided with a first side face and a second side face which are opposite; the first radiation circuit is arranged on the first side surface and is a strip-shaped circuit, and load patches are arranged at two ends of the first radiation circuit; the second radiation line is symmetrically arranged on the first side surfaces of the two sides of the first radiation line and comprises a first radiation patch and a second radiation patch, wherein one end of the first radiation patch is connected with the second radiation patch; the third radiation line comprises third radiation patches symmetrically arranged on the first side surfaces at two sides of the first radiation line; the connecting wire is arranged on the second side surface, and two ends of the connecting wire are respectively connected with the third radiation patch through metal through holes; a feeder line disposed on the second side surface and connected to a feeding point of the first radiation line via a metal via; and the feed network is arranged on the second side surface, and two ends of the feed network are respectively connected with the second radiation patch through metal through holes. The WiFi omni-directional antenna can cover the frequency bands of 5.15GHz-5.85GHz and 5.925GHz-7.125GHz simultaneously, and has the characteristics of wide bandwidth, low out-of-roundness and high gain.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a wide bandwidth high-gain WiFi omnidirectional antenna.
Background
With the rapid development of wireless communication technology nowadays, the popularity of WiFi networks is continuously increasing, and with the advent of various mobile intelligent devices such as mobile phones, tablet computers, etc. The realization of data transmission by using a wireless WiFi network is an indispensable function of various mobile devices. The WiFi antenna is one of the most important components in the wireless WiFi network, and the performance of the antenna directly affects or even determines the performance of the WiFi network. With the advent of the 5G era, the wireless WiFi frequency band is also increasing and optimizing, from 5G Wi-Fi, namely 2.4GHz and 5GHz dual frequency operation to a new WiFi6 frequency band, the wider frequency band makes industry requirements on the performance of the WiFi antenna higher and higher, so it is valuable to design a WiFi antenna which covers both the 5G and 6G frequency bands.
The gain of the current high-gain omni-directional WiFi antenna can reach more than 5dBi, even if the antenna can reach the omni-directional gain of 5dBi, the antenna can usually only realize narrower bandwidth and cannot completely cover the WiFi5GHz (5.15 GHz-5.85 GHz) frequency band and the WiFi6GHz (5.925 GHz-7.125 GHz) frequency band. Therefore, the antenna design has a great difficulty in realizing high gain and good omnidirectionality on the basis of covering the WiFi5GHz and WiFi6GHz frequency band bandwidths. In addition, the problems of material selection, size and the like are not negligible in designing an antenna.
Disclosure of Invention
The invention aims to solve the technical problems, and aims to provide a WiFi omni-directional antenna with wide bandwidth and high gain, which can cover frequency bands of 5.15GHz-5.85GHz and 5.925GHz-7.125GHz simultaneously, and has the characteristics of wide bandwidth, low out-of-roundness and high gain.
In order to achieve the above-mentioned purpose, the present invention provides a WiFi omni-directional antenna, including a dielectric substrate, having a first side and a second side opposite to each other; the first radiation circuit is arranged on the first side surface and is a strip circuit, and load patches are arranged at two ends of the first radiation circuit; the second radiation line is symmetrically arranged on the first side surfaces at two sides of the first radiation line and comprises a first radiation patch and a second radiation patch, wherein one end of the first radiation patch is connected with one end of the second radiation patch; the third radiation line comprises third radiation patches symmetrically arranged on the first side surfaces at two sides of the first radiation line; the connecting wires are arranged on the second side surface, and two ends of the connecting wires are respectively connected with the third radiation patch through metal through holes penetrating through the dielectric substrate; a feeder line provided on the second side surface and connected to a feeding point of the first radiation line via a metal via penetrating the dielectric substrate; and the feed network is arranged on the second side surface, and two ends of the feed network are respectively connected with the second radiation patch through metal through holes penetrating through the dielectric substrate.
Preferably, the middle part of the first radiation patch is provided with a ladder-shaped notch which is symmetrically arranged, one side of the middle part of the second radiation patch is provided with a rectangular notch, and the middle part of the third radiation patch is provided with a ladder-shaped notch which is symmetrically arranged.
Preferably, the length and width of the first radiation patch are 23.9mm by 6.2mm, the length and width of the second radiation patch are 18.4mm by 6.3mm, and the length and width of the third radiation patch are 23.9mm by 6.2mm.
Preferably, the distance between the feeding point and the center of the first radiation line is 1/4 of the medium wavelength.
Preferably, the feed network is disposed at one side of the feeder, and two connection lines extending to two ends of the feeder toward one side are disposed in the middle of the feed network.
Preferably, the load patch has an "E" shape.
Preferably, the length and width of the first radiation line are 85mm x 0.61mm.
Preferably, the dielectric substrate is an FR4 board with a dielectric constant of 4.4 and a thickness of 1.6 mm.
Preferably, the length and width of the dielectric substrate are 130mm to 15mm.
According to the description and practice, the WiFi omni-directional antenna disclosed by the invention covers 5.15-5.85GHz and 5.925-7.125GHz frequency bands simultaneously, and the out-of-roundness of the WiFi omni-directional antenna is kept below 3.75dBi, so that the WiFi omni-directional antenna has good omni-directional radiation performance.
In addition, by selecting the feeding point at the position deviated from the 1/4 medium wavelength of the first radiation line, 180-degree phase compensation can be generated for one-to-two feeding, the problem that the radiation pattern is deviated along with the frequency caused by series feeding is overcome, the wide bandwidth is realized, meanwhile, the gain stability is kept, and the good omnidirectional radiation performance of the H surface in the whole bandwidth frequency band is realized.
In addition, by connecting the terminal load patch with the E-shaped structure at the tail end of the first radiation line, the bandwidth can be improved, the out-of-roundness of the radiation pattern can be reduced, and good omnidirectional radiation can be realized.
Drawings
Fig. 1 is a schematic structural diagram of a first side of a WiFi omni-directional antenna according to the invention.
Fig. 2 is a schematic structural diagram of a second side of the WiFi omni-directional antenna of the present invention.
Fig. 3 is a standing wave ratio diagram of a WiFi omni-directional antenna according to the present invention.
Fig. 4 is a radiation efficiency diagram of a WiFi omni-directional antenna of the present invention.
Fig. 5 is a gain diagram of a WiFi omni-directional antenna according to the invention.
Fig. 6 is a non-circularity plot of a WiFi omni-directional antenna of the present invention.
Fig. 7 is a pattern of a WiFi omni-directional antenna of the present invention at a frequency of 5.6 GHz.
Fig. 8 is a directional diagram of a WiFi omni-directional antenna of the present invention at a frequency of 6.4 GHz.
The reference numerals in the figures are:
1. a dielectric substrate;
2. a first radiation line;
3. a second radiation line 31, a first radiation patch 32, a second radiation patch;
4. a third radiation line;
5. loading a patch;
6. a connecting wire;
7. a feeder line;
8. and a feed network.
Detailed Description
Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. In the present disclosure, the terms "comprising," "including," "having," "disposed in" and "having" are intended to be open-ended and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and the like, are used merely as labels, and do not limit the number or order of their objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a first side of a WiFi omni-directional antenna according to the invention. Fig. 2 is a schematic structural diagram of a second side of the WiFi omni-directional antenna of the present invention.
Referring to fig. 1 and 2, the WiFi omni-directional antenna includes a dielectric substrate 1, where the dielectric substrate 1 is an FR4 board with a dielectric constant of 4.4, a length of 130mm, a width of 15mm, and a thickness of 1.6mm in this embodiment, so as to reduce the manufacturing cost of the antenna to some extent, and the antenna has a first side and a second side disposed opposite to each other, fig. 1 shows a structure on the first side, and fig. 2 shows a structure on the second side.
A first radiation line 2, a second radiation line 3 and a third radiation line 4 are provided on a first side of the dielectric substrate 1. The first radiation circuit 2 is an elongated metal circuit, and is disposed in the middle of the first side surface, along the length direction of the first side surface, and in this embodiment, the length and width of the first radiation circuit are 85mm x 0.61mm. The second radiation line 3 is symmetrically disposed on a first side surface of both sides of the first radiation line 2, and the second radiation line 3 includes two first radiation patches 31 and two second radiation patches 32. As shown in fig. 1, two first radiation patches 31 and two second radiation patches 32 are symmetrically disposed on both sides of the first radiation line 2, respectively, and adjacent end portions of the first radiation patches 31 and the second radiation patches 32 on the same side are directly connected by a copper-clad line. The third radiation line 4 is composed of two third radiation patches symmetrically arranged on both sides of the first radiation line 2. Specifically, in this embodiment, the length and width of the first radiation patch 31 is 23.9mm by 6.2mm, the length and width of the second radiation patch 32 is 18.4mm by 6.3mm, and the length and width of the third radiation patch is 23.9mm by 6.2mm.
Referring to fig. 2, a connection line 6 for connecting the two third radiation patches is disposed on the second side surface of the dielectric substrate 1. Both ends of the connecting wire 6 are respectively connected with the third radiation patches on both sides of the first radiation line 2 through metal vias penetrating through the dielectric substrate 1. Through the above-mentioned connecting line 6, it is possible to ensure that the radiation current on the third radiation patch is balanced, thereby stabilizing the radiation performance.
A feed line 7 is also provided on the second side of the dielectric substrate 1, the feed line 7 being connected to a feed point on the first radiation line 2 via a metal via penetrating said dielectric substrate 1. The feeding point is arranged at the position 1/4 of the medium wavelength away from the center of the first radiation line 2, 180-degree phase compensation can be generated for one-to-two feeding by arranging the feeding point at a proper distance away from the center of the first radiation line 2, the problem that the radiation pattern is offset along with the frequency caused by series feeding is solved, the wide bandwidth is realized, the gain stability is maintained, and the maximum gain direction of the radiation pattern is stabilized.
Furthermore, a feed network 8 is provided on the second side of the dielectric substrate 1. As shown in fig. 2, the feeding network 8 includes a transverse base line, and two ends of the base line are respectively connected to the second radiation patches 32 on the first side via metal vias penetrating the dielectric substrate 1. Two connecting lines are arranged in the middle of the basic line along the length direction of the medium substrate 1, and are positioned at two sides of the feeder 7 and are connected with the ground wire of the antenna feeder. That is, when the antenna is in use, the core wire of the antenna feeder is connected to the feeder 6, and the ground wire of the antenna feeder is connected to the connection line.
Preferably, the first radiating patch 31 and the third radiating patch are rectangular patches, and two sides of the middle part of the patches are symmetrically provided with step-shaped notches, as shown in fig. 1, and the depths of the notches gradually decrease from the middle part to two ends. The middle part of the second radiating patch 32 is provided with only one rectangular notch.
The two ends of the first radiation line 2 are further provided with load patches 5, in this embodiment, the load patches 5 have an E-shaped structure, and the load patches 5 function to increase the bandwidth of the antenna and reduce the out-of-roundness of the radiation pattern, so as to achieve good omnidirectional radiation.
Fig. 3 is a standing wave ratio diagram of a WiFi omni-directional antenna according to the present invention. The graph shows standing wave ratio curves of the WiFi omni-directional antenna in the frequency range of 5.0GHz-7.2GHz, and the graph shows that the standing wave ratios in the WiFi5GHz frequency range (5.15 GHz-5.85 GHz) and the WiFi6GHz frequency range (5.925 GHz-7.125 GHz) are smaller than 2, so that the omni-directional broadband WiFi antenna can be applied to the WiFi5GHz and 6GHz frequency ranges, and has certain practical value.
Fig. 4 is a radiation efficiency diagram of a WiFi omni-directional antenna of the present invention. The graph shows the radiation efficiency curve diagram of the WiFi omni-directional antenna in the frequency range of 5.0GHz-7.2GHz, and the radiation efficiency in the WiFi5GHz frequency range (5.15 GHz-5.85 GHz) and the WiFi6GHz frequency range (5.925 GHz-7.125 GHz) is known to be greater than 0.85, so that the omni-directional broadband WiFi antenna is ensured to have higher radiation efficiency when being applied to the WiFi5GHz and 6GHz frequency ranges.
Fig. 5 is a gain diagram of a WiFi omni-directional antenna according to the invention. The graph shows the gain curve diagram of the WiFi omni-directional antenna in the frequency range of 5.0GHz-7.2GHz, and the gains in the WiFi5GHz frequency range (5.15 GHz-5.85 GHz) and the WiFi6GHz frequency range (5.925 GHz-7.125 GHz) are above 5 dBi.
Fig. 6 is a non-circularity plot of a WiFi omni-directional antenna of the present invention. The graph shows that the non-circularity curve of the WiFi omni-directional antenna in the frequency range of 5.0GHz-7.2GHz, the non-circularity in the frequency range of 5.15GHz-5.85GHz of WiFi is less than 1.75dBi, and the non-circularity in the frequency range of 6GHz of WiFi (5.925 GHz-7.125 GHz) is less than 3.75dBi, so that the WiFi omni-directional antenna has good omni-directional radiation performance.
Fig. 7 is a pattern of a WiFi omni-directional antenna of the present invention at a frequency of 5.6 GHz. The main polarization curve graph and the cross polarization curve graph of the WiFi omni-directional antenna at the frequency of 5.6GHz are shown, the range of the variation from the minimum gain to the maximum gain of the main polarization of the H surface at the frequency of 5.6GHz is not more than 2dBi, namely, the out-of-roundness is less than 2dBi, and the cross polarization is also below-25 dBi, so that the range is controlled to be in an ideal range.
Fig. 8 is a directional diagram of a WiFi omni-directional antenna of the present invention at a frequency of 6.4 GHz. The main polarization curve graph and the cross polarization curve graph of the WiFi omni-directional antenna at the frequency of 6.4GHz are shown, the variation range from the minimum gain to the maximum gain of the main polarization of the H surface at the frequency of 6.4GHz is not more than 2.5dBi, namely, the out-of-roundness is less than 2.5dBi, and the cross polarization is also below-20 dBi, so that the range is controlled to be in an ideal range.
In summary, the WiFi omni-directional antenna has the advantages that the out-of-roundness of the H surface is small (less than 2.5 dBi) on two frequency points (5.6 GHz and 6.4 GHz) in the whole target frequency band, the cross polarization is low (-20 dBi), and the omni-directional antenna has better omni-directional radiation performance.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. A WiFi omni-directional antenna, comprising:
a dielectric substrate having a first side and a second side opposite to each other;
the first radiation circuit is arranged on the first side surface and is a strip circuit, and load patches are arranged at two ends of the first radiation circuit;
the second radiation line is symmetrically arranged on the first side surfaces at two sides of the first radiation line and comprises a first radiation patch and a second radiation patch, wherein one end of the first radiation patch is connected with one end of the second radiation patch;
the third radiation line comprises third radiation patches symmetrically arranged on the first side surfaces at two sides of the first radiation line;
the connecting wires are arranged on the second side surface, and two ends of the connecting wires are respectively connected with the third radiation patch through metal through holes penetrating through the dielectric substrate;
a feeder line provided on the second side surface and connected to a feeding point of the first radiation line via a metal via penetrating the dielectric substrate; and
and the feed network is arranged on the second side surface, and two ends of the feed network are respectively connected with the second radiation patch through metal through holes penetrating through the dielectric substrate.
2. The WiFi omni-directional antenna of claim 1,
the first radiation patch middle part has the echelonment breach that the symmetry set up, one side at second radiation patch middle part has the rectangle breach, the third radiation patch middle part has the echelonment breach that the symmetry set up.
3. The WiFi omni-directional antenna of claim 1 wherein the first radiating patch has a length and width of 23.9mm by 6.2mm, the second radiating patch has a length and width of 18.4mm by 6.3mm, and the third radiating patch has a length and width of 23.9mm by 6.2mm.
4. The WiFi omni-directional antenna of claim 1 wherein the feed point is a distance of 1/4 of a dielectric wavelength from the center of the first radiating line.
5. The WiFi omni-directional antenna according to claim 1, wherein the feed network is disposed at one side of the feed line, and two connection lines extending to one side to two ends of the feed line are disposed at the middle of the feed network.
6. The WiFi omni-directional antenna of claim 1 wherein the load patch is an "E" shaped structure.
7. The WiFi omni-directional antenna of any of claims 1 to 6, wherein the length and width of the first radiating line is 85mm x 0.61mm.
8. The WiFi omni directional antenna of any of claims 1 to 6, wherein the dielectric substrate is an FR4 board with a dielectric constant of 4.4 and a thickness of 1.6 mm.
9. The WiFi omni-directional antenna of claim 8 wherein the dielectric substrate has a length and width of 130mm x 15mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110179579.2A CN112993575B (en) | 2021-02-07 | 2021-02-07 | WiFi omnidirectional antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110179579.2A CN112993575B (en) | 2021-02-07 | 2021-02-07 | WiFi omnidirectional antenna |
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| CN112993575A CN112993575A (en) | 2021-06-18 |
| CN112993575B true CN112993575B (en) | 2024-04-09 |
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| CN202110179579.2A Active CN112993575B (en) | 2021-02-07 | 2021-02-07 | WiFi omnidirectional antenna |
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| CN114883788A (en) * | 2022-05-17 | 2022-08-09 | Oppo广东移动通信有限公司 | Antenna, radio frequency front-end module and communication equipment |
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| "一种应用于WIFI及蓝牙的水平极化全向天线";侯甲等;《2013年全国微波毫米波会议论文集中国电子学会微波分会》;20130521;第1909-1911页 * |
| "一种用于煤矿井下无线通信的多频段微带天线的设计";于涵等;《华北科技学院学报》;20191104;第16卷(第4期);第71-76页 * |
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