CN112993575A - WiFi omnidirectional antenna - Google Patents
WiFi omnidirectional antenna Download PDFInfo
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- CN112993575A CN112993575A CN202110179579.2A CN202110179579A CN112993575A CN 112993575 A CN112993575 A CN 112993575A CN 202110179579 A CN202110179579 A CN 202110179579A CN 112993575 A CN112993575 A CN 112993575A
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- 230000005855 radiation Effects 0.000 claims abstract description 104
- 239000000758 substrate Substances 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 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 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease 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
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- 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
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- 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 side surface and a second side surface, wherein the first side surface and the second side surface are opposite; the first radiation circuit is arranged on the first side face and is a strip-shaped circuit, and load patches are arranged at two ends of the first radiation circuit; the second radiation circuit is symmetrically arranged on the first side surface at two sides of the first radiation circuit and comprises a first radiation patch and a second radiation patch which are connected at one end; the third radiation circuit comprises third radiation patches which are symmetrically arranged on the first side surfaces at two sides of the first radiation circuit; the connecting line is arranged on the second side surface, and two ends of the connecting line are respectively connected with the third radiation patch through the metal through holes; the feeder line is arranged on the second side surface and is connected with a feed point of the first radiation line through a metal through hole; 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 omnidirectional antenna can simultaneously cover 5.15GHz-5.85GHz and 5.925GHz-7.125GHz frequency bands, and has the characteristics of wide bandwidth, low non-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, the popularity of WiFi networks is increasing, and with the emergence of various mobile smart devices such as mobile phones and tablet computers, the WiFi networks are rapidly developing. The data transmission by using the wireless WiFi network is an indispensable function of various mobile devices. The WiFi antenna is one of the most important components in the WiFi network, and the performance of the antenna directly affects or even determines the performance of the WiFi network. With the arrival of the 5G era, wireless WiFi frequency bands are increasing and optimizing, from 5G Wi-Fi, namely, 2.4GHz and 5GHz dual-frequency operation to a new WiFi6 frequency band, the wider and wider frequency band makes the industrial requirement for the performance of a WiFi antenna higher and higher, so it is valuable to design a WiFi antenna covering 5G and 6G frequency bands simultaneously.
The gain of the current high-gain omnidirectional WiFi antenna can reach more than 5dBi, and even if the antenna can reach 5dBi omnidirectional gain, the antenna can only realize narrower bandwidth generally and cannot completely cover the WiFi5GHz (5.15GHz-5.85GHz) frequency band and the WiFi6GHz (5.925GHz-7.125GHz) frequency band. Therefore, it is a difficult point of antenna design to realize high gain and good omni-directionality on the basis of covering WiFi5GHz and WiFi6GHz frequency band bandwidths. In addition, the problems of material selection, size and the like are not negligible when the antenna is designed.
Disclosure of Invention
The present invention is made to solve the above-mentioned technical problems, and an object of the present invention is to provide a wide-bandwidth high-gain WiFi omnidirectional antenna, which can simultaneously cover 5.15GHz-5.85GHz and 5.925GHz-7.125GHz bands, and has the characteristics of wide bandwidth, low out-of-roundness, and high gain.
In order to achieve the above object, the present invention provides a WiFi omnidirectional antenna, which includes a dielectric substrate having a first side surface and a second side surface opposite to each other; 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 circuit is symmetrically arranged on the first side surface at two sides of the first radiation circuit and comprises a first radiation patch and a second radiation patch which are connected at one end; the third radiation line comprises third radiation patches which are symmetrically arranged on the first side surface at two sides of the first radiation line; the connecting line is arranged on the second side face, and two ends of the connecting line are respectively connected with the third radiation patches through metal through holes penetrating through the dielectric substrate; the feeder line is arranged on the second side surface and is connected with a feed point of the first radiation line through a metal through hole penetrating through 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 via holes penetrating through the dielectric substrate.
Preferably, the first radiation patch has a symmetrical stepped notch in the middle, the second radiation patch has a rectangular notch on one side of the middle, and the third radiation patch has a symmetrical stepped notch in the middle.
Preferably, the length and width of the first radiation patch is 23.9mm 6.2mm, the length and width of the second radiation patch is 18.4mm 6.3mm, and the length and width of the third radiation patch is 23.9mm 6.2 mm.
Preferably, the distance between the feeding point and the center of the first radiation line is 1/4 medium wavelengths.
Preferably, the feeding network is arranged on one side of the feeding line, and two connecting lines extending to two ends of the feeding line are arranged in the middle of the feeding network.
Preferably, the load patch is of an "E" shaped configuration.
Preferably, the length and width of the first radiation line is 85mm × 0.61 mm.
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 x 15 mm.
According to the above description and practice, the WiFi omnidirectional antenna of the present invention covers 5.15-5.85GHz and 5.925-7.125GHz bands simultaneously, and its non-circularity is kept below 3.75dBi, which has good omnidirectional radiation performance.
In addition, the feeding point is selected at a position deviated from the medium wavelength of the first radiation line 1/4, so that 180-degree phase compensation can be generated for one-to-two feeding, the problem that a radiation pattern is deviated along with frequency caused by series feeding is solved, the wide bandwidth is realized, the gain is stable, and the good H-plane omnidirectional radiation performance in the whole bandwidth frequency band is realized.
In addition, the tail end of the first radiation line is connected with the terminal load patch with the E-shaped structure, so that the bandwidth can be improved, the out-of-roundness of a 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 of the present 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 of the present invention.
Fig. 4 is a radiation efficiency graph of a WiFi omni-directional antenna of the present invention.
Fig. 5 is a gain diagram of a WiFi omni-directional antenna of the present invention.
Fig. 6 is a diagram of out-of-roundness of a WiFi omni-directional antenna of the present invention.
Fig. 7 is a directional diagram of the WiFi omni antenna of the present invention at a frequency of 5.6 GHz.
Fig. 8 is a directional diagram of the WiFi omni antenna of the present invention at a frequency of 6.4 GHz.
The reference numbers 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 feed line;
8. and a feed network.
Detailed Description
Exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments, however, may be embodied in many different 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 example 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 their repetitive description will be omitted. In the present disclosure, the terms "include", "arrange", "disposed" and "disposed" are used to mean open-ended inclusion, 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 are not limiting as to the number or order of their objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a schematic structural diagram of a first side of a WiFi omni-directional antenna of the present 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 fig. 2, the WiFi omni-directional antenna includes a dielectric substrate 1, in this embodiment, 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, which can reduce the manufacturing cost of the antenna to some extent, and has a first side and a second side that are oppositely disposed, 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 the first side of the dielectric substrate 1. The first radiation line 2 is a long metal line, is disposed in the middle of the first side surface, and is disposed along the length direction of the first side surface, and in this embodiment, the length and width thereof are 85mm × 0.61 mm. The second radiation line 3 is symmetrically disposed on the first side surfaces 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 respectively symmetrically disposed on both sides of the first radiation line 2, and the adjacent end portions of the first radiation patch 31 and the second radiation patch 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 are 23.9mm × 6.2mm, the length and width of the second radiation patch 32 are 18.4mm × 6.3mm, and the length and width of the third radiation patch are 23.9mm × 6.2 mm.
Referring to fig. 2, a connection line 6 for connecting two third radiation patches is disposed on the second side of the dielectric substrate 1. Two ends of the connecting wire 6 are respectively connected with the third radiation patches on two sides of the first radiation line 2 through metal via holes penetrating through the dielectric substrate 1. Through above-mentioned connecting wire 6, can guarantee the radiation current equilibrium on the third radiation paster to stable 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 radiating line 2 via a metal via passing through the dielectric substrate 1. And the feeding point is arranged at the position of 1/4 medium wavelengths away from the center of the first radiation line 2, and the feeding point is arranged at a proper distance away from the center of the first radiation line 2, so that 180-degree phase compensation can be generated for one-to-two feeding, the problem of radiation pattern deviation along with frequency caused by series feeding is solved, the wide bandwidth is realized, the gain is stable, and the maximum gain direction of the radiation pattern is stabilized.
Furthermore, a feed network 8 is also provided on the second side of the dielectric substrate 1. As shown in fig. 2, the feed network 8 comprises a transverse basic circuit, and two ends of the basic circuit are respectively connected to the second radiation patches 32 on the first side surface through metal vias penetrating through the dielectric substrate 1. Two connecting lines are arranged in the middle of the basic line along the length direction of the dielectric substrate 1, are positioned at two sides of the feeder line 7 and are used for connecting with the ground wire of the antenna feeder line. That is, when the antenna is in use, the core of the antenna feed is connected to the feed line 6 and the ground of the antenna feed is connected to the connection line.
Preferably, the first radiation patch 31 and the third radiation patch are rectangular patches, and stepped notches are symmetrically formed on two sides of the middle portion of the first radiation patch 31 and the third radiation patch, as shown in fig. 1, the depth of the notches gradually decreases from the middle portion to the two ends. The second radiating patch 32 is provided with only one rectangular notch in the middle.
The two ends of the first radiation line 2 are further provided with load patches 5, in this embodiment, the load patches 5 are in an "E" shape structure, and the load patches 5 are used for improving the bandwidth of the antenna and reducing the non-circularity 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 of the present invention. The graph shows a standing-wave ratio curve of the WiFi omnidirectional antenna in a frequency band of 5.0GHz-7.2GHz, and it can be known from the graph that the standing-wave ratios in a WiFi5GHz frequency band (5.15GHz-5.85GHz) and a WiFi6GHz frequency band (5.925GHz-7.125GHz) are both less than 2, so that the omnidirectional wideband WiFi antenna can be applied in the WiFi5GHz and 6GHz frequency bands, and has certain practical value.
Fig. 4 is a radiation efficiency graph of a WiFi omni-directional antenna of the present invention. The graph shows the radiation efficiency curve of the WiFi omnidirectional antenna in the frequency band of 5.0GHz-7.2GHz, and it can be known from the graph that the radiation efficiency in the WiFi5GHz frequency band (5.15GHz-5.85GHz) and the WiFi6GHz frequency band (5.925GHz-7.125GHz) is greater than 0.85, so that the omnidirectional wideband WiFi antenna is ensured to have higher radiation efficiency when applied to the WiFi5GHz and 6GHz frequency bands.
Fig. 5 is a gain diagram of a WiFi omni-directional antenna of the present invention. The graph shows the gain curve of the WiFi omnidirectional antenna in the 5.0GHz-7.2GHz band, and it can be known that the gains in the WiFi5GHz band (5.15GHz-5.85GHz) and the WiFi6GHz band (5.925GHz-7.125GHz) are both above 5 dBi.
Fig. 6 is a diagram of out-of-roundness of a WiFi omni-directional antenna of the present invention. The graphs of the unroundness of the WiFi omnidirectional antenna in the 5.0GHz-7.2GHz band are shown in the figure, and it can be known from the graphs that the unroundness in the WiFi5GHz band (5.15GHz-5.85GHz) is less than 1.75dBi, and the unroundness in the WiFi6GHz band (5.925GHz-7.125GHz) is less than 3.75dBi, and the good omnidirectional radiation performance is achieved.
Fig. 7 is a directional diagram of the WiFi omni antenna of the present invention at a frequency of 5.6 GHz. The graphs of main polarization and cross polarization of the H plane (a plane parallel to the first side face) and the E plane (a plane perpendicular to the length direction of the dielectric substrate) of the WiFi omnidirectional antenna at the frequency of 5.6GHz are shown in the figure, and it can be known that the variation range from the minimum gain to the maximum gain of the main polarization of the H plane 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 below-25 dBi, which is controlled in an ideal range.
Fig. 8 is a directional diagram of the WiFi omni antenna of the present invention at a frequency of 6.4 GHz. The graphs of main polarization and cross polarization of the H-plane (a plane parallel to the first side face) and the E-plane (a plane perpendicular to the length direction of the dielectric substrate) of the WiFi omnidirectional antenna at the frequency of 6.4GHz are shown in the figure, and it can be known that the variation range from the minimum gain to the maximum gain of the main polarization of the H-plane 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, which is controlled in the ideal range.
In conclusion, the WiFi omnidirectional antenna has the advantages that H-plane out-of-roundness is small (smaller than 2.5dBi) at two frequency points (5.6GHz and 6.4GHz) in the whole target frequency band, cross polarization is low (lower than-20 dBi), and the WiFi omnidirectional antenna has good omnidirectional 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 attributes 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-shaped circuit, and load patches are arranged at two ends of the first radiation circuit;
the second radiation circuit is symmetrically arranged on the first side surface at two sides of the first radiation circuit and comprises a first radiation patch and a second radiation patch which are connected at one end;
the third radiation line comprises third radiation patches which are symmetrically arranged on the first side surface at two sides of the first radiation line;
the connecting line is arranged on the second side face, and two ends of the connecting line are respectively connected with the third radiation patches through metal through holes penetrating through the dielectric substrate;
the feeder line is arranged on the second side surface and is connected with a feed point of the first radiation line through a metal through hole penetrating through 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 via holes penetrating through the dielectric substrate.
2. The WiFi omnidirectional antenna of claim 1,
the middle part of the first radiation patch is provided with symmetrically arranged step-shaped gaps, one side of the middle part of the second radiation patch is provided with a rectangular gap, and the middle part of the third radiation patch is provided with symmetrically arranged step-shaped gaps.
3. The WiFi omni directional antenna of claim 1, wherein the first radiating patch has a length and width of 23.9mm 6.2mm, the second radiating patch has a length and width of 18.4mm 6.3mm, and the third radiating patch has a length and width of 23.9mm 6.2 mm.
4. The WiFi omni directional antenna of claim 1, wherein the feed point is located a distance 1/4 medium wavelength from the first radiating line center.
5. The WiFi omni directional antenna according to claim 1, wherein the feeding network is disposed at one side of the feeding line, and two connection lines extending to both ends of the feeding line are disposed at the middle of the feeding 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 one of claims 1 to 6, wherein the length and width of the first radiating line is 85mm x 0.61 mm.
8. The WiFi omnidirectional antenna of any one of claims 1-6, 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 by 15 mm.
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|---|---|---|---|
| CN202110179579.2A CN112993575B (en) | 2021-02-07 | 2021-02-07 | WiFi omnidirectional antenna |
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|---|---|---|---|
| CN202110179579.2A CN112993575B (en) | 2021-02-07 | 2021-02-07 | WiFi omnidirectional antenna |
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| CN112993575A true CN112993575A (en) | 2021-06-18 |
| CN112993575B CN112993575B (en) | 2024-04-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| Publication number | Publication date |
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| CN112993575B (en) | 2024-04-09 |
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