CN106229635B - A kind of omnidirectional's dual circularly polarized antenna of ipsilateral feed - Google Patents
A kind of omnidirectional's dual circularly polarized antenna of ipsilateral feed Download PDFInfo
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- CN106229635B CN106229635B CN201610634955.1A CN201610634955A CN106229635B CN 106229635 B CN106229635 B CN 106229635B CN 201610634955 A CN201610634955 A CN 201610634955A CN 106229635 B CN106229635 B CN 106229635B
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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
- 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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Abstract
The present invention provides a kind of omnidirectional's dual circularly polarized antennas of ipsilateral feed, it include: irradiation structure, quasi-coaxial impedance matching structure, RF excited converts T-type connection structure, the quasi-coaxial impedance matching structure is divided into quasi-coaxial impedance matching structure and lower class coaxial impedance mating structure, the irradiation structure it is upper, lower end is separately connected the lower end of quasi-coaxial impedance matching structure and the upper end of lower class coaxial impedance mating structure, it is closed with metal disk the upper end of upper quasi-coaxial impedance matching structure, the lower end connection RF excited of lower class coaxial impedance mating structure converts T-type connection structure, the interface of RF excited conversion T-type connection structure can directly adopt sub-miniature A connector feeder line and carry out RF excited.Omnidirectional's performance of the present invention and axis are than functional, and with certain bandwidth of operation, -10dB bandwidth 600M (5.2GHz-5.8GHz) is greater than 5.2dB, up to 6.7dB with interior gain.
Description
Technical field
The present invention relates to a kind of antennas, and in particular, to a kind of ipsilateral feed realizes the antenna of omnidirectional's double-circle polarization.
Background technique
Circular polarized antenna is since it can receive, emits the characteristic of any polarization incoming wave and obtains more and more extensive answer
With.In many application scenarios, reception, the signal emitted must handle these signals from from all directions in order to preferable, it is necessary to
Realize the circular polarisation performance of omnidirectional.But the decline of the gain as brought by omnidirectional is more obvious.
By literature search, Dan Yu, Shu-Xi Gong et al. 2014 in IEEE Trans.Antennas Propag.
Article " the Wideband Omnidirectional Circularly Polarized Patch Antenna delivered on periodical
Based on Vortex Slots and Shorting Vias " proposes a kind of omnidirectional circular-polarized antenna, although 10dB impedance
Bandwidth reaches 51.7%, 3dB axial ratio bandwidth and has also reached 57.8%, but with interior gain less than 2dBic.
In addition, even if being able to achieve higher omnidirectional gain and double-circle polarization characteristic, it can guarantee between double-circle polarization not phase
Mutually interference is also a problem.Through literature search, Zhou Bin, Junping Geng et al. is published in for 2015
Article " Dual Circularly on International Journal of Antennas and Propagation periodical
Polarized Omnidirectional Antenna with Slot Array on Coaxial Cylinder " is proposed
A kind of omnidirectional's dual circularly polarized antenna, although realizing the gain and good circular polarization characteristics of 5dBic or so in frequency band,
Since its left-right-hand circular polarization feed port is distributed in the both ends of antenna, if antenna will realize horizontal omnidirectional circular polarisation, antenna
Feed mouth cable in lower end connects more convenient when vertical placement, but the hanging portion of upper end feed port institute wiring cable is inherently
Antenna pattern is impacted, so that the circular polarization characteristics of broken loop antenna, need when antenna being caused to need to realize different circular polarisation
It reinstalls, makes troubles to user.
Summary of the invention
For the defects in the prior art, it is double that the object of the present invention is to provide a kind of omnidirectionals with certain bandwidth of operation
Circular polarized antenna.The antenna -10dB bandwidth reaches 10.9%, and horizontal omnidirectional axis ratio is less than 3dB in whole bandwidth, in
Horizontal omnidirectional gain is greater than 5.2dB, and highest-gain reaches 6.7dB.
In order to achieve the above objectives, the technical solution adopted in the present invention is as follows:
A kind of omnidirectional's dual circularly polarized antenna of ipsilateral feed, comprising: irradiation structure, quasi-coaxial impedance matching structure, radio frequency
Excitation conversion T-type connection structure, the quasi-coaxial impedance matching structure are divided into quasi-coaxial impedance matching structure and lower quasi-coaxial
Impedance matching structure, the lower end that the upper and lower end of the irradiation structure is separately connected quasi-coaxial impedance matching structure are similar under
The upper end of the upper end of axis impedance matching structure, upper quasi-coaxial impedance matching structure is closed with metal disk, lower class coaxial impedance
The lower end connection RF excited of distribution structure converts T-type connection structure, and the interface that RF excited converts T-type connection structure can be direct
RF excited is carried out using sub-miniature A connector feeder line.
The irradiation structure includes irradiation structure inner conductor, irradiation structure outer conductor, inner core, is metal cylinder, inner core
Top is connected with metal disk, and irradiation structure inner conductor is spaced a distance to provide energy stream with irradiation structure top
The channel for entering/flowing out.
Between the irradiation structure inner conductor and outer conductor, filled media between irradiation structure inner conductor and inner core.
The irradiation structure outer wall offers and is mutually 90 degree of rectangular aperture two-by-two,
The gap is multiple around opening up for one week for irradiation structure outer wall, the upper and lower outside radiated electromagnetic wave of multiple groups.
The quasi-coaxial impedance matching structure includes mating structure inner conductor, medium, mating structure outer conductor, the matching
Structure inner conductor is more segment outer diameters and the variant metal cylinder of length.
Filled media between the mating structure inner conductor and outer conductor.
There are two ports for the RF excited conversion connecting T-shaped structure, connect wherein lower feedback port is connected with RF excited conversion
Connect T-type structure inner conductor and inner core；Port inner core is presented in side and the RF excited conversion connecting T-shaped structure inner conductor of lower feedback port connects
It connects, side feedback port generally gradual change coaxial line structure, two ports can be connect with standard SMA.
The antenna is fed from T-type connection structure from lower feedback port, energy in the medium between inner core and inner conductor to
The media fraction travelled over between inner conductor and outer conductor (since inner conductor is not connect with top metal disk, makes ectonexine
Connection between medium), pass through gap radiation when propagating still further below, realizes left-hand circular polarization.Port is presented from T-type connection structure side
Feed, energy is transferred into the medium between internal and external conductor from gradual change coaxial line, upwardly propagates on one side, on one side from gap radiation energy
Amount realizes right-handed circular polarization.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, omnidirectional's dual circularly polarized antenna efficiency of the present invention is higher, and isolation is preferable between two-port, thus increasing with higher
Benefit.
2, omnidirectional's performance of the present invention is good.
3, the present invention has wider -10dB bandwidth 10.9%.
4, lower feedback port and side the feedback port of T-type connection structure of the invention can directly connect SMA head, and connection is facilitated to make
With.
5, two feeding points of T-type connection structure of the present invention are closer and are isolated preferably, can according to need and facilitate real
Existing left-right-hand circular polarization.Avoid shadow when feeding point works while antenna both ends are likely to cause to circular polarisation performance
It rings.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram of omnidirectional's dual circularly polarized antenna of the present invention；
Fig. 2 is the exploded view of Fig. 1；
Fig. 3 be Fig. 1 along the sectional view of A-A；
Fig. 4 is cross-sectional view of the Fig. 1 along B-B；
Fig. 5 is the return loss plot of omnidirectional's dual circularly polarized antenna of the embodiment of the present invention；
Fig. 6 is the horizontal omnidirectional axis of three frequency points between 5.2GHz, 5.5GHz, 5.8GHz of the embodiment of the present invention than figure；
Fig. 7 is the horizontal omnidirectional gain diagram of three frequency points between 5.2GHz, 5.5GHz, 5.8GHz of the embodiment of the present invention.
In figure: 1 is the irradiation structure of antenna, and 2 be antenna quasi-coaxial impedance matching structure, and 3, which convert T-type for RF excited, connects
Binding structure, 4 for wherein one group of radiating element gap up and down, 5 be radiating slot array, and 6 be aerial radiation structure outer conductor, 7
For aerial radiation structure filling medium (including the medium between the medium and inner conductor and inner core between outer conductor and inner conductor),
8 be aerial radiation structure inner conductor, and 9 convert T-type connection structure outer conductor for RF excited, and 10, which convert T-type for RF excited, connects
Binding structure filled media, 11 convert T-type connection structure inner conductor for RF excited, and 12 convert T-type connection structure for RF excited
Lower feedback port, 13, which convert T-type connection structure side for RF excited, presents port, and 14 be upper mating structure inner conductor, and 15 be lower matching
Structure inner conductor.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
Please refer to FIG. 1 to FIG. 4, omnidirectional's dual circularly polarized antenna of ipsilateral feed provided by the present invention, comprising: 1, day
Beta radiation structure, 2, quasi-coaxial impedance matching structure, 3, RF excited conversion T-type connection structure.Upper quasi-coaxial impedance matching knot
Structure upper end is closed with metal disk, lower termination aerial radiation structure.Aerial radiation structure lower end connects lower quasi-coaxial mating structure again.
RF excited is terminated under lower quasi-coaxial mating structure converts T-type connection structure.RF excited converts T-type connection structure lower end, side
End can directly adopt sub-miniature A connector feeder line and carry out RF excited.
Further, aerial radiation structure 1 is class (seemingly) double coaxial line structure, and irradiation structure face outer conductor 6 is metal, thick
1.5mm, diameter 25mm, length 150.9mm are spent, the rectangle of orthogonal (90 degree of angle) is opened on irradiation structure face outer conductor 6
Gap 4, one week 4, upper and lower 4 groups of compositions radiating slot battle array.8 be aerial radiation structure inner conductor, diameter 1.5mm, with outer conductor
Equal length is equal, filled media 7 between internal and external conductor, which is Teflon, dielectric constant 2.1.Inner core radius is
0.46mm, length are equal with outer conductor.
Further, class (seemingly) coaxial impedance mating structure 2, mating structure are all directly connected in 1 top and bottom of irradiation structure
Outer conductor and irradiation structure outer conductor 6, inner core, inner conductor etc. are connect.The upper mating structure of upper and lower quasi-coaxial impedance matching structure
Inner conductor 14 and lower mating structure inner conductor 15 are three sections of different metal cylinders of diameter, and internal diameter is equal to inner conductor outer diameter, on
3 of quasi-coaxial impedance matching structure are respectively 3.7mm, 6.0mm, 6.5mm as the metal ring diameter of mating structure inner conductor,
Length is respectively 7.9mm, 6.0mm, 6.5mm；3 metal ring diameters of lower class coaxial impedance mating structure be respectively 3.2mm,
7.4mm, 6.9mm, length are respectively 8.1mm, 5.5mm, 8.1mm, they are connected directly, and realize that impedance becomes with transmission line theory
It changes.Filled media 10 is Teflon between mating structure inner conductor and outer conductor.
Further, RF excited is connected below lower class coaxial impedance mating structure convert T-type connection structure 3, lower class
Coaxial impedance mating structure outer conductor is connect with T connector lower end cylinder-shaped joint by the structure of gradual change, and thickness and quasi-coaxial hinder
Anti- mating structure outer conductor is identical.The outer conductor 9 and inner core internal diameter thickness that T connector lower end cylinder-shaped joint includes are tied with radiation
It is identical in structure, quasi-coaxial impedance matching structure.The connector of T connector side is gradual change coaxial line structure, inner core and T connector lower end
Outer conductor 9 in connector connects, and diameter is identical as outer conductor, then is gradient to the SMA interface of standard.End connector and side under T connector
End connector can directly be connect with sub-miniature A connector.
The working principle of omnidirectional's double-circle polarization of the present invention is as follows:
As shown in Figure 1 to 4, omnidirectional's dual circularly polarized antenna of ipsilateral feed provided by the present invention turns from RF excited
The lower feedback port and side feedback port for changing T-type connection structure are motivated respectively can realize left-handed and dextrorotation circular polarisation performance respectively.
Antenna is fed from the lower feedback port of T-type connection structure, and energy is upwardly propagated to interior from the medium between inner core and inner conductor and led
Media fraction between body and outer conductor (since inner conductor is not connect with top metal disk, makes to join between ectonexine medium
It is logical), pass through gap radiation when propagating still further below, realizes left-hand circular polarization.It is fed from T-type connection structure side feedback port, energy
It is transferred into the medium between internal and external conductor from gradual change coaxial line, upwardly propagates on one side, on one side from gap radiation energy, realize right
Hand circular polarization.
Specifically as shown in figure 4, rf excitation signal feeds antenna by feedback port 12 lower in Fig. 4, signal first passes through interior
The similar axis structure that core and RF excited conversion T-type connection structure inner conductor 11 and the medium 10 between them form passes upwards
It broadcasts, reaches the quasi-coaxial knot formed to external diffusion, beginning along inner conductor, outer conductor and the medium between them after aerial head
Structure is propagated downwards.Due to inside and outside quasi-coaxial structural impedance mismatch, quasi-coaxial impedance matching structure is first passed through, so that S11
It is less than -10dB within the scope of 5.2GHz-5.8GHz, realizes impedance matching.Signal is from the outside spoke of gap array on irradiation structure 1
It penetrates, to there is higher gain.Energy since first gap to external radiation, it is seldom at the 4th gap, so only
There is little energy to enter T-type structure side feedback port, to keep the isolation of two ports preferable.If desired higher increasing is realized
Benefit can suitably increase the number of radiating slot.
Similar, rf excitation signal is presented port 13 by side in Fig. 4 and is fed to antenna, and signal is passed by gradual change coaxial line
Enter radiator, coaxial line structure upwardly propagates outside the class of the medium composition into inner conductor and outer conductor and between them, Bian Chuan
Side is broadcast from the outside radiation energy in gap.Due to the outer coaxial configuration impedance of gradual change coaxial line (T-type structure) and class mismatch, first pass through
Quasi-coaxial mating structure is crossed down, so that S22 is less than -10dB, the design of quasi-coaxial mating structure within the scope of 5.2GHz-5.8GHz
Based on transmission line theory, impedance matching is realized.Signal from four groups of gap arrays 5 on irradiation structure 1 to external radiation, thus
There is higher gain.Energy since the 4th gap to external radiation, seldom at first gap, energy only seldom in this way
Amount enters interior similar axle construction, until lower feedback port 12, to keep the isolation of two ports preferable.
It is the return loss plot that the emulation of the present embodiment obtains as shown in Figure 5.It can be seen from the figure that in 5.2GHz-
Return loss is less than -10dB in 5.8GHz frequency range.
Be as shown in Figure 6 this example emulation obtain in tri- frequency point horizontal omnidirectionals of 5.2GHz, 5.5GHz, 5.8GHz
The axis of (Theta=90 °) is than figure.It can be seen from the figure that axis is substantially all than Largest Mean in 5.2GHz-5.8GHz frequency range
In 3dB or less.
Be as shown in Figure 7 this example emulation obtain in tri- frequency point horizontal omnidirectionals of 5.2GHz, 5.5GHz, 5.8GHz
The gain diagram of (Theta=90 °).It can be seen from the figure that gain minimum value is all larger than in 5.2GHz-5.8GHz frequency range
5.2dB, the maximum omnidirectional to 5.7dB and antenna are functional.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (2)
1. a kind of omnidirectional's dual circularly polarized antenna of ipsilateral feed characterized by comprising irradiation structure, quasi-coaxial impedance matching
Structure, RF excited convert T-type connection structure, the quasi-coaxial impedance matching structure be divided into quasi-coaxial impedance matching structure and
Lower class coaxial impedance mating structure, the upper and lower end of the irradiation structure are separately connected the lower end of quasi-coaxial impedance matching structure
Closed with the upper end of the upper end of lower class coaxial impedance mating structure, upper quasi-coaxial impedance matching structure with metal disk, under it is similar
The lower end connection RF excited of axis impedance matching structure converts T-type connection structure, and the RF excited conversion T-type connection structure has
Two ports, wherein T-type connection structure inner conductor and inner core are converted by RF excited in lower feedback port；Port inner core is presented under in side
The RF excited conversion T-type connection structure inner conductor connection of port is presented, port generally gradual change coaxial line structure, two ends are presented in side
Mouth can directly adopt sub-miniature A connector feeder line and carry out RF excited；
The irradiation structure includes irradiation structure inner conductor, irradiation structure outer conductor, inner core, is metal cylinder, inner core top
It is connected with metal disk, irradiation structure inner conductor is spaced a distance to provide energy inflow/stream with irradiation structure top
Channel out is filled between the irradiation structure inner conductor and irradiation structure outer conductor, between irradiation structure inner conductor and inner core
Medium, the irradiation structure outer wall offer and are mutually 90 degree of rectangular aperture two-by-two；
The quasi-coaxial impedance matching structure includes mating structure inner conductor, medium, mating structure outer conductor, the mating structure
Inner conductor is more segment outer diameters and the variant metal cylinder of length, the mating structure inner conductor and mating structure outer conductor it
Between filled media.
2. omnidirectional's dual circularly polarized antenna of ipsilateral feed according to claim 1, which is characterized in that the rectangular aperture around
One week of irradiation structure outer wall opens up multiple, the upper and lower outside radiated electromagnetic wave of multiple groups.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108256368B (en) * | 2016-12-28 | 2021-10-26 | 航天信息股份有限公司 | Method and device for generating dual-port network |
| CN108258426A (en) * | 2018-01-10 | 2018-07-06 | 西安电子工程研究所 | A kind of Circular polarized omni-directional Spiral slot antenna |
| 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 |
| CN110854519B (en) * | 2019-11-23 | 2022-08-12 | 武汉市联华飞创科技有限公司 | Conformal antenna device |
| CN112086371B (en) * | 2020-08-19 | 2023-03-14 | 中国电子科技集团公司第二十九研究所 | Broadband radio frequency board level interconnection integration method, structure and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201741801U (en) * | 2009-11-17 | 2011-02-09 | 上海航天测控通信研究所 | Small-sized high-gain circular polarized antenna |
| CN103022705A (en) * | 2012-12-27 | 2013-04-03 | 北京理工大学 | Dielectric loaded wideband miniature dual circularly polarized antenna |
| CN104505578A (en) * | 2014-12-31 | 2015-04-08 | 上海交通大学 | Omnidirectional dual circularly polarized antenna |
-
2016
- 2016-08-04 CN CN201610634955.1A patent/CN106229635B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201741801U (en) * | 2009-11-17 | 2011-02-09 | 上海航天测控通信研究所 | Small-sized high-gain circular polarized antenna |
| CN103022705A (en) * | 2012-12-27 | 2013-04-03 | 北京理工大学 | Dielectric loaded wideband miniature dual circularly polarized antenna |
| CN104505578A (en) * | 2014-12-31 | 2015-04-08 | 上海交通大学 | Omnidirectional dual circularly polarized antenna |
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