CN104505578A - Omnidirectional dual circularly polarized antenna - Google Patents
Omnidirectional dual circularly polarized antenna Download PDFInfo
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- CN104505578A CN104505578A CN201410855494.1A CN201410855494A CN104505578A CN 104505578 A CN104505578 A CN 104505578A CN 201410855494 A CN201410855494 A CN 201410855494A CN 104505578 A CN104505578 A CN 104505578A
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Abstract
The invention provides an omnidirectional dual circularly polarized antenna which is an integrally coaxial structure; a medium is filled between inner and outer conductors which are coaxially arranged; rectangular gaps (with an included angle of 90 degrees) which are perpendicular with one another are formed in the conductor wall of the outer conductor of an antenna radiation structure; the upper and the lower gaps which are perpendicular with one another are divided into a group to form a gap pair; four groups of gaps are formed in the periphery of the conductor wall to form a radiation unit; the four groups of the radiation units are arranged up and down to form a radiation array which is an antenna radiation section. Upper and lower ends of the antenna radiation structure are respectively used as dual circularly polarized two feeder ports; a coaxial tapered transmission line structure is adopted for changing the interface into a practical SMA interface dimension for performing radio frequency feeder. According to the embodiment disclosed by the invention, the omnidirectional performances and the dual circularly polarized performances are good, the working frequency band is 5.1-5.9GHZ, -15dB isolation bandwidth is 12.8%, a reflection coefficient in the isolation bandwidth is smaller than (-)10dB, omnidirectional surface gain within the band is 3dBic-dBic, and the omnidirectional average axial ratio is smaller than 3dB.
Description
Technical field
The present invention relates to the antenna of communication technical field, particularly, relate to a kind of omnidirectional's dual circularly polarized antenna realizing omnidirectional's double-circle polarization.
Background technology
Along with the development of modern communication technology, simple linear polarization is difficult to meet communicating requirement.Circular polarized antenna has the incoming wave that can receive any polarization mode, and the antenna that its radiated wave also can go out any polarization mode receives, and has rotation direction orthogonality, can suppress the advantage such as sexual intercourse interference and anti-multipath reflection.Due to the superior function of circular polarized antenna in modern communications, be subject to people and more and more pay close attention to.Circular polarized omni-directional realizes the omnidirectional radiation characteristic of antenna under the condition ensureing circular polarization, can omnibearing transmitting or receive the electromagnetic wave of any polarization of any direction.Have a wide range of applications in fields such as RFDI, radio and television, mobile base station, remote sensing remote measurement, Aero-Space, electronic countermeasures, electronic jamming.
In present research, the implementation for omnidirectional circular-polarized antenna has a lot, can be to use the circular polarized antenna of directed radiation to carry out array combination, makes each antenna element in array cover certain angular range, adds up and realizes omnidirectional's covering; Also can be use the antenna of linear polarization omnidirectional radiation to realize circular polarization by controlling feed form or loading parasitic element.But these are only single circular polarization implementations, the antenna form realizing omnidirectional's double-circle polarization is little.And dual circularly polarized antenna has larger advantage and the degree of freedom relative to single circular polarization, for user, there is larger value.Due to up to the present, omnidirectional's dual circularly polarized antenna research is still less, and the design load of omnidirectional's dual circularly polarized antenna must be furtherd investigate.
Summary of the invention
For above shortcomings in prior art, provide a kind of omnidirectional dual circularly polarized antenna, this omnidirectional's dual circularly polarized antenna has certain bandwidth of operation, have that structure is simple, omnidirectional's performance and double-circle polarization feature of good performance,-15dB isolation bandwidth 12.8%, isolation bandwidth reflection coefficient is less than-10dB, and Dai Nei omnidirectional face gain 3dBic-7dBic, the average axial ratio in omnidirectional face is less than 3dB.
For achieving the above object, the present invention is achieved by the following technical solutions.
A kind of omnidirectional dual circularly polarized antenna, comprise coaxial aerial radiation structure and RF excited structure, described RF excited structure comprises upper end RF excited structure and lower end RF excited structure, described upper end RF excited structure and lower end RF excited structure are arranged at the top and bottom of aerial radiation structure respectively, carry out RF excited; Described upper end RF excited structure adopts a SMA feeder head to carry out feed and forms left-hand circular polarization mode SMA RF excited port, described lower end RF excited structure adopts the 2nd SMA feeder head to carry out the SMA RF excited port of feed formation right-handed circular polarization mode, realizes left-handed and dextrorotation double-circle polarization characteristic;
Described aerial radiation structure comprises inner wire I and the outer conductor I of coaxial setting, the conducting wall of the outer conductor of described aerial radiation structure has and organizes radiating element more, wherein, each group radiating element includes four groups of gaps pair, each group slot pairs includes two orthogonal rectangular apertures, four pairs of rectangular apertures in each group radiating element are arranged along cylindrical circle Monday of the outer conductor conducting wall of aerial radiation structure, realize the omnidirectional radiation of antenna; Many groups radiating element forms the radiating curtain be arranged above and below.
Preferably, described radiating element is four groups, and four groups of radiating elements form the radiating curtain be arranged above and below.
Preferably, described RF excited structure adopts coaxial transition line structure.
Preferably, described RF excited structure includes inner wire II and the outer conductor II of coaxial setting, is equipped with filled media between described inner wire I and outer conductor I and between inner wire II and outer conductor II.
Preferably, described filled media adopts Teflon, and the dielectric constant of filled media is 2.1.
Preferably, described outer conductor I is directly connected with outer conductor II, and the diameter of link position is identical; Described inner wire I is directly connected with inner wire II, and the diameter of link position is identical.
Preferably, described inner wire I, outer conductor I, inner wire II and outer conductor II are metal cylinder structure, and Construction integration is shaping.
Compared with prior art, the present invention has following beneficial effect:
1, the present invention improves radiation efficiency and the gain of omnidirectional's dual circularly polarized antenna by the form of rectangular aperture composition radiating curtain.
2, omnidirectional of the present invention performance and double-circle polarization performance are very good.
3, the present invention has wider bandwidth of operation, and-15dB isolation bandwidth is 12.8%, and in band, S11 is less than-10dB.
4, be of the present inventionly metal Construction integration and integrated SMA feeding interface, facilitate feed, and have that mechanical strength is large, stability is high, long-lived feature.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the structural representation of omnidirectional of the present invention dual circularly polarized antenna, and wherein, (a) is overall structure schematic diagram, and (b) is exploded view;
Fig. 2 is omnidirectional of the present invention dual circularly polarized antenna view, and wherein, (a) is front view, and (b) is A-A cutaway view, and (c) is B-B cutaway view;
Fig. 3 be omnidirectional's dual circularly polarized antenna of the embodiment of the present invention band in S parameter curve;
Fig. 4 is the embodiment of the present invention in the gain of 5.1GHz-5.9GHz frequency band internal antenna horizontal omnidirectional H plane (Theta=90 °) and average axial ratio value, wherein, a () is left-hand circular polarization result, (b) is right-handed circular polarization result;
Fig. 5 is the antenna pattern of the embodiment of the present invention at 5.5GHz frequency, wherein, a () is horizontal omnidirectional H plane (XOY plane in Theta=90 ° of rectangular coordinate system) antenna pattern during left-hand circular polarization port feed, b () is vertical E plane (the XOZ plane in Phi=0 ° of rectangular coordinate system) antenna pattern during left-hand circular polarization port feed, c () is horizontal omnidirectional H plane (Theta=90 °) antenna pattern during right-handed circular polarization port feed, d () is vertical E plane (Phi=0 °) antenna pattern during right-handed circular polarization port feed,
In figure: 1 is aerial radiation structure, 2 is upper end RF excited structure, 3 is lower end RF excited structure, 4 is rectangular aperture, 5 is radiating curtain, 6 is the outer conductor of aerial radiation structure, 7 is the filled media of aerial radiation structure, 8 is the inner wire of aerial radiation structure, 9 is the outer conductor of RF excited structure, and 10 is the filled media of RF excited structure, and 11 is the inner wire of RF excited structure, 12 for left-hand circular polarization mode SMA RF excited port, and 13 is the SMA RF excited port of right-handed circular polarization mode.
Embodiment
Below embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Please refer to Fig. 1 to Fig. 5.
A kind of omnidirectional dual circularly polarized antenna, comprise coaxial aerial radiation structure and RF excited structure, described RF excited structure comprises upper end RF excited structure and lower end RF excited structure, described upper end RF excited structure and lower end RF excited structure are arranged at the top and bottom of aerial radiation structure respectively, carry out RF excited; Described upper end RF excited structure adopts a SMA feeder head to carry out feed and forms left-hand circular polarization mode SMA RF excited port, described lower end RF excited structure adopts the 2nd SMA feeder head to carry out the SMA RF excited port of feed formation right-handed circular polarization mode, realizes left-handed and dextrorotation double-circle polarization characteristic.
Further, described RF excited structure adopts coaxial transition line structure.
Further, described aerial radiation structure and RF excited structure include inner wire and the outer conductor of coaxial setting, are provided with filled media between described inner wire and outer conductor.
Further, described filled media adopts Teflon, and the dielectric constant of filled media is 2.1.
Further, the outer conductor of described aerial radiation structure is directly connected with the outer conductor of RF excited structure, and the diameter of link position is identical; The inner wire of described aerial radiation structure is directly connected with the inner wire of RF excited structure, and the diameter of link position is identical.
Further, the conducting wall of the outer conductor of described aerial radiation structure has and organizes radiating element more, wherein, each group radiating element includes four groups of gaps pair, each group slot pairs includes two orthogonal rectangular apertures, four pairs of rectangular apertures in each group radiating element are arranged along cylindrical circle Monday of the outer conductor conducting wall of aerial radiation structure, realize the omnidirectional radiation of antenna.
Further, described radiating element is four groups, and four groups of radiating elements form the radiating curtain be arranged above and below.
Further, described inner wire and outer conductor are metal cylinder structure.
Below in conjunction with accompanying drawing, the present embodiment is further described.
Please refer to Fig. 1 (a), Fig. 1 (b), Fig. 2 (a), Fig. 2 (b) and Fig. 2 (c), a kind of omnidirectional dual circularly polarized antenna that the present embodiment provides, comprising: aerial radiation structure 1, upper end RF excited structure 2 and lower end RF excited structure 3.Aerial radiation structure is coaxial configuration, upper and lower two ends are directly connected with upper end RF excited structure 2 and lower end RF excited structure 3 respectively, directly adopt SMA feeder head to carry out RF excited in the port of upper end RF excited structure 2 and lower end RF excited structure 3 respectively again, working method is respectively left-hand circular polarization and right-handed circular polarization.
Further, aerial radiation structure 1 is coaxial line structure, the outer conductor 6 external diameter 29.4mm of aerial radiation structure, length is 180mm, the outer conductor 6 of aerial radiation structure is opened the rectangular aperture 4 of orthogonal (angle 90 degree), the long 24.9mm of rectangular aperture, stitch wide being about and stitch 1/5th of length, be one group of gap group with upper and lower like this two orthogonal rectangular apertures, outer conductor 6 excircle of aerial radiation structure is opened four groups of such gaps pair, become a radiating element, upper and lower 4 radiating elements composition radiating curtain 5.The inner wire 8 of aerial radiation structure, its external diameter is 8.4mm, and outer conductor 6 equal length with aerial radiation structure, is provided with filled media 7 between internal and external conductor, this filled media is Teflon, and dielectric constant is 2.1.
Further, upper end RF excited structure 2 and lower end RF excited structure 3 all adopt coaxial transition line, the outer conductor 9 of the upper and lower end RF excited structure of diameter change, be directly connected respectively, and junction diameter is identical with the outer conductor 6 of aerial radiation structure.The inner wire 11 of upper and lower end RF excited structure, is directly connected with radiant section coaxial inner conductor 8 respectively, and diameter is 8.4mm.Diameter and the aerial radiation structure inner and outer conductor diameter of inner and outer conductor the inner of RF excited structure are consistent.Be equipped with filled media 10 between inner and outer conductor, filled media 10 is Teflon.The SMA RF excited port of left-hand circular polarization mode SMA RF excited port one 2 and right-handed circular polarization mode all adopts sub-miniature A connector.
The operation principle of omnidirectional of the present invention double-circle polarization is as follows:
As shown in Fig. 1 (a), Fig. 1 (b), Fig. 2 (a), Fig. 2 (b) He Fig. 2 (c), be front view and the planing surface view of embodiment omnidirectional dual circularly polarized antenna.Rf excitation signal is by SMA RF excited port one 3 pairs of antenna feeds of the left-hand circular polarization mode SMA RF excited port one 2 in Fig. 2 and right-handed circular polarization mode, and signal is from the radiating curtain 5 aerial radiation structure 1 to external radiation.Each rectangular aperture radiation polarized wave on the outer conductor 6 of aerial radiation structure, two vertical rectangular aperture radiation are two vertical line polarization waves, due to upper and lower two vertical rectangular apertures apart
the electric current flowing through two vertical clearance gap is made to produce 90 degree of phase differences, thus two gaps form one group of gap pair to external radiation circularly polarised wave, the circular polarization mode that feed direction difference produces is just different, therefore from two ports respectively feed define double-circle polarization working method.Four groups of gaps are opened to formation one group of radiating element, so realize the omnidirectional radiation of antenna at outer conductor 6 circumference one circle of aerial radiation structure.To be arranged above and below composition radiating curtain 5 with four such radiating elements, the spacing of the radiating element in radiating curtain is λ
g(medium wavelength), each gap is made to be equivalent to homophase feed, directional diagram superposes in far field, control the spacing of radiating element in the size in gap in radiating curtain each radiating element and radiating curtain simultaneously, the radiating element of radiating curtain is made to realize homophase feed, and select dielectric constant be 2.1 medium, make radiating element spacing λ
g-0.7 ×λ
0, wherein, λ
0for air wavelength, make antenna have higher bore utilance, thus have comparatively high radiation efficiency.
The S parameter curve chart that the emulation of the present embodiment obtains as shown in Figure 3.As can be seen from the figure, in 5.1GHz-5.9GHz, return loss is less than-10dB, and isolation is greater than 15dB.
That the gain in the horizontal omnidirectional H face (Theta=90 °) in 5.1GHz-5.9GHz frequency band that the emulation of this example obtains and average axial ratio figure, Fig. 4 (a) and Fig. 4 (b) are respectively left-hand circular polarization and right-handed circular polarization result as shown in Fig. 4 (a) He Fig. 4 (b).As can be seen from the figure, in 5.1GHz-5.9GHz, the average axial ratio of horizontal plane of two kinds of polarization modes is all less than 3dB, and gain is from 3-7dBic.
H face (Theta=90 °) and E face (Phi=0 °) directional diagram of the left-hand circular polarization at 5.5GHz frequency that obtains of the emulation of this example and right-handed circular polarization radiation as shown in Fig. 5 (a), Fig. 5 (b), Fig. 5 (c) He Fig. 5 (d).As can be seen from the figure, the omnidirectional of antenna when left-hand circular polarization and right-handed circular polarization is functional, and polarization isolation is greater than 15dB.
A kind of omnidirectional dual circularly polarized antenna that the present embodiment provides, be applied to communication technical field, entire physical is coaxial configuration, filled media between the inner and outer conductor of coaxial setting, the outer conductor conducting wall of aerial radiation structure is opened the rectangular aperture of orthogonal (angle 90 degree), it is one group with orthogonal upper and lower gap, form gap pair, cylindrical circle Monday of conducting wall opens four groups of gaps to composition radiating element, four groups of radiating elements are arranged above and below composition radiating curtain, and this is aerial radiation section.The two ends up and down of aerial radiation structure, respectively as two feed port of double-circle polarization, adopt coaxial transition line structure interface to be become actual SMA interface size and carry out radio-frequency feed.The present embodiment omnidirectional performance and double-circle polarization functional, working band is from 5.1-5.9GHz ,-15dB isolation bandwidth 12.8%, and isolation bandwidth reflection coefficient is less than-10dB, and Dai Nei omnidirectional face gain 3dBic-7dBic, the average axial ratio in omnidirectional face is less than 3dB.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (7)
1. omnidirectional's dual circularly polarized antenna, it is characterized in that, comprise coaxial aerial radiation structure and RF excited structure, described RF excited structure comprises upper end RF excited structure and lower end RF excited structure, described upper end RF excited structure and lower end RF excited structure are arranged at the top and bottom of aerial radiation structure respectively, carry out RF excited; Described upper end RF excited structure adopts a SMA feeder head to carry out feed and forms left-hand circular polarization mode SMA RF excited port, described lower end RF excited structure adopts the 2nd SMA feeder head to carry out the SMA RF excited port of feed formation right-handed circular polarization mode, realizes left-handed and dextrorotation double-circle polarization characteristic;
Described aerial radiation structure comprises inner wire I and the outer conductor I of coaxial setting, the conducting wall of the outer conductor of described aerial radiation structure has and organizes radiating element more, wherein, each group radiating element includes four groups of gaps pair, each group slot pairs includes two orthogonal rectangular apertures, four pairs of rectangular apertures in each group radiating element are arranged along cylindrical circle Monday of the outer conductor conducting wall of aerial radiation structure, realize the omnidirectional radiation of antenna; Many groups radiating element forms the radiating curtain be arranged above and below.
2. omnidirectional according to claim 1 dual circularly polarized antenna, is characterized in that, described radiating element is four groups, and four groups of radiating elements form the radiating curtain be arranged above and below.
3. omnidirectional according to claim 1 dual circularly polarized antenna, is characterized in that, described RF excited structure adopts coaxial transition line structure.
4. omnidirectional according to claim 3 dual circularly polarized antenna, it is characterized in that, described RF excited structure includes inner wire II and the outer conductor II of coaxial setting, is equipped with filled media between described inner wire I and outer conductor I and between inner wire II and outer conductor II.
5. omnidirectional according to claim 4 dual circularly polarized antenna, is characterized in that, described filled media adopts Teflon, and the dielectric constant of filled media is 2.1.
6. omnidirectional according to claim 4 dual circularly polarized antenna, is characterized in that, described outer conductor I is directly connected with outer conductor II, and the diameter of link position is identical; Described inner wire I is directly connected with inner wire II, and the diameter of link position is identical.
7. omnidirectional according to claim 3 dual circularly polarized antenna, is characterized in that, described inner wire I, outer conductor I, inner wire II and outer conductor II are metal cylinder structure, and Construction integration is shaping.
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| CN201410855494.1A CN104505578A (en) | 2014-12-31 | 2014-12-31 | Omnidirectional dual circularly polarized antenna |
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| CN201410855494.1A CN104505578A (en) | 2014-12-31 | 2014-12-31 | Omnidirectional dual circularly polarized antenna |
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Cited By (8)
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| CN106229635A (en) * | 2016-08-04 | 2016-12-14 | 上海交通大学 | A kind of omnidirectional dual circularly polarized antenna of homonymy feed |
| CN106252878A (en) * | 2016-08-04 | 2016-12-21 | 上海交通大学 | Space diversity based on circular polarized antenna covers receive-transmit system |
| CN106252879A (en) * | 2016-08-31 | 2016-12-21 | 安徽四创电子股份有限公司 | A kind of band wire feed cross seam double-circle polarization linear array |
| CN108777366A (en) * | 2018-04-18 | 2018-11-09 | 西安电子科技大学 | A kind of slotted coaxial antenna for realizing 45 ° of inclined polarizations of horizontal omnidirectional radiation |
| CN112003001A (en) * | 2020-08-12 | 2020-11-27 | 上海交通大学 | Omnidirectional dual-circular polarization based phased random multi-polarization antenna and multi-polarization channel communication system |
| CN112768927A (en) * | 2021-01-22 | 2021-05-07 | 吉林大学 | Coaxial heating microwave antenna with H-shaped cracks and beam-collecting type microwave antenna |
| CN112838358A (en) * | 2020-12-31 | 2021-05-25 | 华南理工大学 | Two-way radiation co-rotation direction double circular polarized antenna based on 3D printing technology |
| CN114976656A (en) * | 2022-05-25 | 2022-08-30 | 西安电子科技大学 | Miniaturized log-periodic antenna with n-shaped bending unit |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229635A (en) * | 2016-08-04 | 2016-12-14 | 上海交通大学 | A kind of omnidirectional dual circularly polarized antenna of homonymy feed |
| CN106252878A (en) * | 2016-08-04 | 2016-12-21 | 上海交通大学 | Space diversity based on circular polarized antenna covers receive-transmit system |
| CN106229635B (en) * | 2016-08-04 | 2019-10-08 | 上海交通大学 | A kind of omnidirectional's dual circularly polarized antenna of ipsilateral feed |
| CN106252878B (en) * | 2016-08-04 | 2020-07-28 | 上海交通大学 | Space diversity covering transmitting-receiving system based on circularly polarized antenna |
| CN106252879A (en) * | 2016-08-31 | 2016-12-21 | 安徽四创电子股份有限公司 | A kind of band wire feed cross seam double-circle polarization linear array |
| CN106252879B (en) * | 2016-08-31 | 2021-07-20 | 安徽四创电子股份有限公司 | Double-circular-polarization linear array with line-fed cross-shaped seam |
| CN108777366A (en) * | 2018-04-18 | 2018-11-09 | 西安电子科技大学 | A kind of slotted coaxial antenna for realizing 45 ° of inclined polarizations of horizontal omnidirectional radiation |
| CN112003001A (en) * | 2020-08-12 | 2020-11-27 | 上海交通大学 | Omnidirectional dual-circular polarization based phased random multi-polarization antenna and multi-polarization channel communication system |
| CN112003001B (en) * | 2020-08-12 | 2022-01-11 | 上海交通大学 | Omnidirectional dual-circular polarization based phased random multi-polarization antenna and multi-polarization channel communication system |
| CN112838358A (en) * | 2020-12-31 | 2021-05-25 | 华南理工大学 | Two-way radiation co-rotation direction double circular polarized antenna based on 3D printing technology |
| CN112768927A (en) * | 2021-01-22 | 2021-05-07 | 吉林大学 | Coaxial heating microwave antenna with H-shaped cracks and beam-collecting type microwave antenna |
| CN114976656A (en) * | 2022-05-25 | 2022-08-30 | 西安电子科技大学 | Miniaturized log-periodic antenna with n-shaped bending unit |
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