CN108448253B - High-isolation dual-frequency dual-polarization omnidirectional antenna - Google Patents
High-isolation dual-frequency dual-polarization omnidirectional antenna Download PDFInfo
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- CN108448253B CN108448253B CN201810324238.8A CN201810324238A CN108448253B CN 108448253 B CN108448253 B CN 108448253B CN 201810324238 A CN201810324238 A CN 201810324238A CN 108448253 B CN108448253 B CN 108448253B
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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
- H01Q5/10—Resonant antennas
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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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
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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
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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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
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a high-isolation dual-frequency dual-polarized omnidirectional antenna, which comprises an antenna radiation unit, a horizontal feed unit and a vertical feed unit, wherein the antenna radiation unit is formed by a cuboid with an opening on the caliber surface and a slotted trapezoidal back cavity, the right side surface of the cuboid is attached to the left side surface of the trapezoidal back cavity, the horizontal feed unit is a gradual change type metal sheet with a U-shaped groove, the horizontal feed unit is positioned in the cuboid with the opening on the caliber surface, and the vertical feed unit is positioned in the slotted trapezoidal back cavity. The antenna can realize better omnidirectional coverage characteristics of horizontal and vertical dual polarization in two frequency bands of 2.32-2.52GHz and 5.09-5.97GHz, and is suitable for the field of mobile communication.
Description
Technical Field
The invention relates to the technical field of mobile communication antennas, in particular to a high-isolation dual-frequency dual-polarization omnidirectional antenna.
Background
With the progress of science and technology, mobile communication plays an increasingly non-replaceable role in the life of people, and antennas are also rapidly developed as an indispensable part in mobile communication. The new generation of technical standards continuously propose that 2G, 3G, 4G and 5G coexist, which necessitates the communication equipment to support more frequency bands, and the antenna is required to have the characteristic of multifrequency. The multi-frequency antenna is not only beneficial to reducing the number of antennas in a mobile communication system, thereby realizing miniaturization, integration and multifunctionality of equipment, but also meeting the requirement of high-speed transmission of a large amount of information among users. The IEEE 802.11n standard is defined by the IEEE official of 9 months 2009, which specifies: 2.4-2.4835GHz and 5.15-5.85GHz are used as wireless WiFi working frequency bands. Nowadays, wiFi has become an indispensable communication technology for people's life, so it has become extremely necessary and significant to study dual-band dual-polarized omni-directional antennas covering the above frequency bands.
The dual polarized antenna is an application of polarization diversity technology, and utilizes two orthogonal polarized electromagnetic signals which are not related to each other to obtain a certain diversity gain. Besides, the dual-polarized antenna can effectively improve the system capacity and the utilization rate of wireless spectrum resources under the condition that the output power and the bandwidth of the equipment are kept unchanged.
The omnidirectional antenna is an antenna which uniformly radiates at 360 degrees on a horizontal plane and has a certain beam width in the vertical plane, so that the transmitted signal can be received by a receiving end in any direction on the horizontal plane, and meanwhile, the omnidirectional antenna can receive signals in all directions on the horizontal plane, and has wide application in the wireless communication fields of broadcast television, mobile communication base stations, WLAN, satellite communication, high-speed aircrafts and the like.
At present, in the field of mobile communication related antennas, the antennas are mainly a double-frequency single-polarization omnidirectional antenna, a single-frequency dual-polarization omnidirectional antenna and a double-frequency dual-polarization directional antenna, and the research on the double-frequency dual-polarization omnidirectional antenna is little.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a high-isolation dual-frequency dual-polarized omnidirectional antenna.
The aim of the invention can be achieved by adopting the following technical scheme:
the high-isolation dual-frequency dual-polarized omnidirectional antenna comprises an antenna radiation unit, a horizontal feed unit and a vertical feed unit, wherein the antenna radiation unit consists of a cuboid with an opening on a caliber surface and a slotted trapezoid back cavity, the right side surface of the cuboid is attached to the left side surface of the trapezoid back cavity, and the horizontal feed unit is a gradual change type metal sheet with a U-shaped groove and is arranged in the cuboid with the opening on the caliber surface; the vertical feed unit consists of a plurality of branches with different thicknesses, wherein the middle branch feeds, two ends are branched to open a circuit and feed a gap of the trapezoid back cavity, and the vertical feed unit is positioned in the slotted trapezoid back cavity; the horizontal feed unit and the vertical feed unit are respectively connected with the coaxial line.
Further, the gradual change form metal sheet is elliptic gradual change, circular gradual change or parabolic gradual change.
Further, the gradual change form sheetmetal opens a way near the one end of cuboid open face, and the midpoint is the feed point at the other end to be connected with coaxial line.
Further, the line length of the gradual change type metal sheet is 0.35 lambda h -0.75λ h Line width of 0.2λ h -0.6λ h Wherein lambda is h For the high-frequency band center resonant frequency f of the antenna h The corresponding wavelength in free space.
Further, the gradual change type metal sheet with the U-shaped groove has symmetrical transverse midlines, and the total length of the U-shaped groove is 0.3lambda h -0.6λ h The width of the groove is 0.5mm-1mm, wherein lambda h For the high-frequency band center resonant frequency f of the antenna h The corresponding wavelength in free space.
Further, the opening direction of the U-shaped groove on the horizontal feeding unit is opposite to the feeding point.
Further, the length of the caliber surface of the cuboid is 0.5lambda L -0.8λ L Width of 0.08λ L -0.25λ L Depth of 0.15 lambda L -0.35λ L ；
The height of the trapezoid back cavity is 0.4lambda L -0.7λ L Depth of 0.1 lambda L -0.3λ L The upper bottom of the trapezoid back cavity is 0.01lambda long L -0.1λ L The bottom length is 0.1 lambda L -0.3λ L Wherein lambda is L For the low-frequency band center resonant frequency f of the antenna L The corresponding wavelength in free space.
Further, the three sides of the trapezoid back cavity are provided with two gaps with different lengths, wherein the width of the short gap is 0.01λ L -0.03λ L The total length of the short gap is 0.45 lambda h -0.65λ h A long slit width of 0.01λ L -0.03λ L The total length of the long slot is 0.3lambda L -0.5λ L Wherein lambda is L For the low-frequency band center resonant frequency f of the antenna L In free spaceCorresponding wavelength lambda h For the high-frequency band center resonant frequency f of the antenna h The corresponding wavelength in free space.
Further, the vertical feeding unit is vertically arranged on the right side surface close to the trapezoid back cavity.
Further, the width of the branch for feeding the short slot in the vertical feeding unit is 0.01lambda h -0.02λ h The width of the branch for feeding the long slot is 0.02lambda L -0.03λ L Wherein lambda is h For the high-frequency band center resonant frequency f of the antenna h Wavelength lambda corresponding to free space L For the low-frequency band center resonant frequency f of the antenna L The corresponding wavelength in free space.
Compared with the prior art, the invention has the following advantages and effects:
1) The dual-frequency vertical omni-directional polarization antenna is composed of two radiating units, wherein the horizontal radiating units are rectangular bodies with caliber surfaces open, omni-directional radiation is formed through the caliber surface opening, the vertical radiating units are trapezoid back cavities, and two horizontal bending gaps are formed to realize dual-frequency vertical omni-directional polarization.
2) The horizontal polarization part of the antenna can realize a double-frequency resonance mode which is well matched and controllable in frequency by adjusting the feeding part of the U-shaped groove and the cuboid radiator and adjusting the length of a gap and the width of a feeding branch knot of the vertical polarization part.
3) The gain of a traditional omni-directional antenna is generally low, and the maximum gain of the antenna can reach 6.3dBi.
4) The isolation of the antenna is good, the polarization isolation in the low frequency band is better than 36.6dB, and the polarization isolation in the high frequency band is better than 40dB.
Drawings
Fig. 1 is a perspective view of a high isolation dual-frequency dual-polarized omnidirectional antenna disclosed by the invention;
fig. 2 is a top view of the high isolation dual-frequency dual-polarized omnidirectional antenna disclosed by the invention;
fig. 3 is a front view of a horizontal feed unit of the high-isolation dual-frequency dual-polarized omnidirectional antenna disclosed by the invention;
fig. 4 is a front view of a vertical feed unit of the high isolation dual-frequency dual-polarized omnidirectional antenna disclosed in the present invention;
fig. 5 is a bandwidth diagram of the high isolation dual-frequency dual-polarized omnidirectional antenna disclosed by the invention;
FIG. 6 is a radiation pattern of an XOY plane at 2.45GHz of a rectangular parallelepiped with an open aperture face in an antenna radiating element of the present disclosure;
FIG. 7 is a radiation pattern of an XOY plane at 5.5GHz of a rectangular parallelepiped with an open aperture face in an antenna radiating element of the present disclosure;
FIG. 8 is a radiation pattern of the XOY plane at 2.45GHz for a trapezoidal back cavity in an antenna radiating element of the present disclosure;
FIG. 9 is a radiation pattern of the XOY plane at 5.5GHz for a trapezoidal back cavity in an antenna radiating element of the present disclosure;
wherein, the reference numerals are as follows:
r- - -antenna radiating element, HF- - -horizontal feed element, VF- - -vertical feed element, C- - -coaxial line.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in fig. 1-4, a high-isolation dual-frequency dual-polarized omnidirectional antenna comprises an antenna radiation unit R, a horizontal feed unit HF and a vertical feed unit VF, wherein the horizontal feed unit HF and the vertical feed unit VF are respectively connected with a 50 ohm coaxial line C.
The antenna is vertically placed, an antenna radiating unit R of the antenna is composed of a cuboid with an opening on an aperture surface and a slotted trapezoid back cavity, a plate of the antenna radiating unit R is a copper plate, and the thickness of the plate is 0.2mm. The horizontal feed unit HF is located in the cuboid and is located in the middle of the vertical direction of the cuboid, the vertical feed unit VF is vertically placed in the trapezoid back cavity, plates of the two feed units are copper plates, and the thickness of the plates is 0.2mm.
In the present embodiment, the rectangular parallelepiped with the aperture surface open realizes horizontal polarization, and the aperture surface length h1=0.64λ L Wide ab=0.13 λ L Rectangular parallelepiped depth ae=0.23λ L Wherein lambda is L For the low-frequency band center resonant frequency f of the antenna L The corresponding wavelength in free space. The horizontal feed unit HF is a graded form of sheet metal, in particular an elliptical, circular or parabolic grading. In this embodiment, an elliptical gradual change is adopted, where the major axis of the ellipse is a=16 mm, the minor axis is b=11.5 mm, the width of the gradual change metal sheet is h_w=18 mm, the gradual change metal sheet is open at one end close to the aperture plane, the other end is away from the antenna radiating element junction d1=12.7 mm, and the midpoint thereof is connected with the 50 ohm coaxial line C, the open U-shaped slot is away from the short-circuited end d2=0.4 mm of the gradual change metal sheet, the slit width s_u=0.9 mm, and the total length is 0.46 λ h Wherein lambda is h For the high-frequency band center resonant frequency f of the antenna h The corresponding wavelength in free space.
In this embodiment, the trapezoid back cavity is used for realizing vertical polarization, the trapezoid back cavity has slits on three sides except the surface connected with the cuboid, the long slits formed on two isosceles vertical surfaces of the trapezoid back cavity have a length of l1=14 mm, and the short slits have a length of l2=4.5 mm, so the total length of the long slits is 0.41 λ L The total length of the short gap is 0.56 lambda h Wherein lambda is L For the low-frequency band center resonant frequency f of the antenna L Wavelength lambda corresponding to free space h For the high-frequency band center resonant frequency f of the antenna h The corresponding wavelength in free space. The upper base length fg=4.4 mm, the lower base length hi=22 mm, and the two slit widths w=3 mm. The vertical feeding unit feeds short slots with a branch width vd3=1 mm and long slots with a branch width vd1=4 mm. The vertical feed unit is verticalIs placed straight to the horizontal plane, the two ends are open, the width of the middle branch is vd 2=3mm, and the middle branch is connected with a 50 ohm coaxial line C. The vertical plane formed by the vertical feeding unit at the distance d=1.6mm from the lower bottom edge of the trapezoid back cavity, and the horizontal feeding unit and the vertical feeding unit are not connected with other objects except the coaxial line.
As shown in fig. 5, the bandwidth of the antenna obtained by simulation in this embodiment can be concluded from the graph that the high-isolation dual-frequency dual-polarized omnidirectional antenna of the present invention has bandwidths of 2.32-2.52GHz and 5.09-5.97GHz, and the return loss reaches-10 dB on the bandwidths, covering the WIFI frequency band; and on the bandwidth, the polarization isolation is more than 36.6dB, and the isolation is high. Fig. 6-9 are graphs of XOY plane radiation patterns of the antenna obtained by simulation at different frequencies, and it can be concluded from the graphs that the high-isolation dual-frequency dual-polarized omnidirectional antenna of the invention has better horizontal omnidirectional radiation characteristics.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (6)
1. The high-isolation dual-frequency dual-polarized omnidirectional antenna is characterized by comprising an antenna radiation unit, a horizontal feed unit and a vertical feed unit, wherein the antenna radiation unit is formed by a cuboid with an opening on a caliber surface and a slotted trapezoid back cavity, the right side surface of the cuboid is attached to the left side surface of the trapezoid back cavity, and the horizontal feed unit is a gradual change type metal sheet with a U-shaped groove and is arranged in the cuboid with the opening on the caliber surface; the vertical feed unit consists of a plurality of branches with different thicknesses, wherein the middle branch feeds, the two ends of the branch feed are open and feed a gap of the trapezoid back cavity, and the vertical feed unit is positioned in the slotted trapezoid back cavity; the horizontal feed unit and the vertical feed unit are respectively connected with a coaxial line; the three sides of the trapezoid back cavity are provided with two gaps with different lengths, whereinShort gap width of 0.01λ L -0.03λ L The total length of the short gap is 0.45 lambda h -0.65λ h A long slit width of 0.01λ L -0.03λ L The total length of the long slot is 0.3lambda L -0.5λ L Wherein lambda is L For the low-frequency band center resonant frequency f of the antenna L Wavelength lambda corresponding to free space h For the high-frequency band center resonant frequency f of the antenna h A wavelength corresponding to the free space;
the width of the branch for feeding the short slot in the vertical feeding unit is 0.01lambda h -0.02λ h The width of the branch for feeding the long slot is 0.02lambda L -0.03λ L Wherein lambda is h For the high-frequency band center resonant frequency f of the antenna h Wavelength lambda corresponding to free space L For the low-frequency band center resonant frequency f of the antenna L A wavelength corresponding to the free space;
the gradual change type metal sheet is in an elliptic gradual change, a circular gradual change or a parabolic gradual change;
the gradual change form sheetmetal is opened a way in the one end that is close to the cuboid open face, and the midpoint of the other end is the feed point to be connected with coaxial line.
2. The high isolation dual-frequency dual-polarized omnidirectional antenna of claim 1, wherein the graded-form metal sheet has a line length of 0.35 λ h -0.75λ h Line width of 0.2λ h -0.6λ h Wherein lambda is h For the high-frequency band center resonant frequency f of the antenna h The corresponding wavelength in free space.
3. The high isolation dual-frequency dual-polarized omnidirectional antenna of claim 1, wherein the graded metal sheet with U-shaped slot has a transverse centerline symmetry, and the total length of the U-shaped slot is 0.3λ h -0.6λ h The width of the groove is 0.5mm-1mm, wherein lambda h For the high-frequency band center resonant frequency f of the antenna h The corresponding wavelength in free space.
4. The high-isolation dual-frequency dual-polarized omnidirectional antenna of claim 1, wherein the U-shaped slot on the horizontal feed unit is open in a direction opposite to the feed point.
5. The high-isolation dual-frequency dual-polarized omnidirectional antenna of claim 1, wherein the caliber surface of the cuboid is 0.5λ long L -0.8λ L Width of 0.08λ L -0.25λ L Depth of 0.15 lambda L -0.35λ L ；
The height of the trapezoid back cavity is 0.4lambda L -0.7λ L Depth of 0.1 lambda L -0.3λ L The upper bottom of the trapezoid back cavity is 0.01lambda long L -0.1λ L The bottom length is 0.1 lambda L -0.3λ L Wherein lambda is L For the low-frequency band center resonant frequency f of the antenna L The corresponding wavelength in free space.
6. The high isolation dual-frequency dual-polarized omnidirectional antenna of claim 1, wherein the vertical feed unit is disposed vertically adjacent to the right side of the trapezoidal back cavity.
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| CN201810324238.8A CN108448253B (en) | 2018-04-12 | 2018-04-12 | High-isolation dual-frequency dual-polarization omnidirectional antenna |
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| CN201810324238.8A CN108448253B (en) | 2018-04-12 | 2018-04-12 | High-isolation dual-frequency dual-polarization omnidirectional antenna |
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| CN108448253B true CN108448253B (en) | 2023-07-18 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449346A (en) * | 2015-12-11 | 2016-03-30 | 华南理工大学 | Ultra-high isolation broadband dual-polarized omnidirectional antenna |
| CN105449357A (en) * | 2015-12-11 | 2016-03-30 | 华南理工大学 | Knife-shaped dual-frequency horizontal polarization omnidirectional antenna |
| CN208299046U (en) * | 2018-04-12 | 2018-12-28 | 华南理工大学 | A kind of high-isolation dual-band and dual-polarization omnidirectional antenna |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449346A (en) * | 2015-12-11 | 2016-03-30 | 华南理工大学 | Ultra-high isolation broadband dual-polarized omnidirectional antenna |
| CN105449357A (en) * | 2015-12-11 | 2016-03-30 | 华南理工大学 | Knife-shaped dual-frequency horizontal polarization omnidirectional antenna |
| CN208299046U (en) * | 2018-04-12 | 2018-12-28 | 华南理工大学 | A kind of high-isolation dual-band and dual-polarization omnidirectional antenna |
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