CN207338627U - Dual polarization coupled dipole array antenna - Google Patents
Dual polarization coupled dipole array antenna Download PDFInfo
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- CN207338627U CN207338627U CN201720441202.9U CN201720441202U CN207338627U CN 207338627 U CN207338627 U CN 207338627U CN 201720441202 U CN201720441202 U CN 201720441202U CN 207338627 U CN207338627 U CN 207338627U
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Abstract
The utility model discloses a kind of dual polarization coupled dipole array antenna, antenna element is formed by two single polarization doublet unit Orthogonal Composites of same type, and single polarization doublet unit is then made of interdigitated dipole and feeder line balun, metal floor, wide angle matching layer.Wherein feed Balun is made of three parts：The coplanar striplines part being connected with dipole, the transition portion of the gradual change triangle microstrip transmission line and centre of feed end and coaxial line connection.The utility model expands band bandwidth on the basis of the array antenna of dipoles using the mutual coupling effect between array element, introduces wide angle matching layer to improve the large-angle scanning characteristic of antenna array；And under being fed to coplanar striplines at the specific frequency point existing for common mode resonance caused by common mode current handle, by the resistance that 50 ohm are set between gradual change ground in metal, shunt common mode current, not only common mode resonance is set to disappear, the bandwidth of operation of antenna has also been expanded at the same time, and the performance in whole bandwidth of operation has good lifting.
Description
Technical field
The present invention relates to ultra-wideband antenna technical field, more particularly to it is a kind of based on interdigitated coupled dipole unit
Dual polarization ultra wide bandwidth angle aerial array.
Background technology
Traditional ultra wide band array antenna is because its advantage is grown rapidly, and deepening continuously with research, he
The shortcomings that also gradually show.First, and most important restraining factors, it is the influence for being coupled to performance and bringing between array.
Since the array element of array antenna is often arranged closely, strong coupling can be produced between adjacent cells so that the field of array element point
Cloth is different from single ultra-wideband antenna, and then influences the performance of whole array.In addition to coupled problem, the volume of ultra-wideband antenna
Problem is also enjoyed and denounced, and traditional Vivaldi antenna arrays, back gradual change Slot Antenna Array are in order to realize the gradual change of impedance, often
Need longer length；Traditional flat helical antenna, in order to realize ultra wide band characteristic, it is necessary to larger radius.It can be seen that tradition
Ultra-wideband antenna battle array due to its volume, it is difficult to realize miniaturization, easily conformal etc. require.
Ultra wide band closely coupled antennae battle array, it is ingenious compared to traditional array to have dissolved the influence coupled between array element, with tradition
Array selection suppresses coupling or to eliminate coupling different, the selection of ultra-wideband coupling antennae battle array and using and strengthen coupling and expand day
Tape is wide.Based on the theory for expanding bandwidth using coupling, closely coupled antennae battle array is not Conventional wide band antenna but oscillator is as battle array
Unit, typical sizes are only the half of maximum operation frequency corresponding wavelength, and volume is much smaller than traditional ultra-wideband antenna.
In terms of section height, closely coupled antennae is in order to improve positive radiation, it is necessary in array plane once a quarter centre frequency ripple
Strong point places one piece of metallic reflection plate.Compared to Vivaldi antennas etc., section height has been obtained for greatly compressing.Except
Foregoing 2 advantages, closely coupled antennae battle array also have easily conformal, large-angle scanning, low RCS (Radar Cross Section), intersection
The advantages such as polarization performance is good.
Research shows that this new array has ultrabroad band characteristic, the characteristic of large-angle scanning；Due to antenna electric size pole
Small, group battle array linear array day after tomorrow overall volume is small, and radar scattering bore is small, thus its can be also used for it is conformal, and will not be to conformal
The aeroperformance of object produces considerable influence.For this kind of new array technique, how to design its structure by its characteristic becomes
The direction of research, therefore, conducts a research this novel antenna structure so as to obtain the antenna technology index tool of higher performance
There is important engineering significance.
The content of the invention
In view of the above shortcomings of the prior art, the present invention provides one kind and is based on interdigitated dual polarization coupled dipole array
Antenna, is acted on, plus matched feeder line structure, this antenna has more preferable broadband and wideangle using the close coupling between dipole array element
Performance.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of dual polarization coupled dipole array antenna is provided, which includes some dual polarized antenna units,
The dual polarized antenna unit includes orthogonally located single polarization doublet unit, and the single polarization dipole includes interdigital section,
The described interdigital section form for being designed as mutually fastening.
The dual polarization dipole subelement include left and right two orthogonal monopoles, each monopole include dipole arm and
Interdigital section；The dipole arm is half opening, and the outward opening of two dipole arms is set, and the opening connects interdigital section；
Interdigital section of complementation for belonging to same single polarization doublet unit plugs together, and forms coupling.
The single polarization doublet unit includes wide angle matching layer, medium substrate, the doublet unit on medium substrate, gold
Possession and transition balun；The triangle gradual change microstrip line part of the feed Balun including lowermost end and middle transition portion and
The coplanar striplines of latter half, the transition portion balun include upper strata ground wire, gradual change ground wire, signal wire；The upper strata ground wire
It is located at signal wire and doublet unit on the same face of medium substrate, the upper end of upper strata ground wire and signal wire connects idol respectively
The monopole of left and right two of pole subelement；The signal wire is divided into upper and lower two section, and the upper section is almost parallel with upper strata ground wire,
Lower section is microstrip line, and microstrip line line width gradually broadens to realize impedance transformation；The medium substrate is equipped with some cycle metals
Via, upper strata ground wire realizes conducting by cycle metallic vias with being connected positioned at the gradual change ground wire of medium substrate another side, with reality
The impedance matching and field matching of existing gradual change；Gradual change line width from bottom to up with the gradual change of curvature gradient ramp reduce, finally with it is upper
Layer ground wire equivalent width.
The doublet unit upper end sets wide angle matching layer, for improving scan characteristic.
The gradual change ground wire uses curvature gradient ramp
Gradual change, h_down represents the height of whole gradient ramp in formula, and c_down, w_down represent transition line independent variable t's respectively
Constant interval, m represent the curvature of gradient ramp.
Described interdigital section is formed by some Continuous Rectangulars are interdigital.
It is the impedance conversion for reaching coaxial line impedence to signal wire that microstrip line is saved under the signal wire, and micro belt line width is from upper
Gradual change triangular in shape broadens under.
Introduce the common mode current for eliminating between 50 Europe resistor loadeds and gradual change bottom line and metal ground and being produced at specific frequency point
Caused common mode resonance.
The present invention has following innovation：
1. the present invention mainly proposes a kind of dual polarization ultra-wideband antenna based on dipole mutual coupling, by adding
The beamwidth of antenna is widened in coupling between powerful formation member.
2. it is simple in structure, it is easy to process：Structure comes from printed dipole antenna, and whole antenna element is all to be printed on PCB
On plate, feeder line structure is also that simple structure is compact by the conversion of two-wire to micro-strip, convenient processing.
3. strong innovation, technology is perspective good：The present invention has used interdigitated capacitance in dipole array element part, by adding
Coupling between strong dipole array element, realizes broadband character；It can be used cooperatively with Meta Materials, realize the functions such as polarization conversion,
The application range of artificial surface plasma device has been expanded, it is perspective with good technology.
4. broadband and wideangle：5.5 frequency multiplication bandwidth can be realized plus the aerial array of feeder line structure, and the scanning in E, H face can
Reach 45 °.
Brief description of the drawings
Fig. 1 is a period of time cell schematics of the invention；
Fig. 2 is a period of time unit side view of the invention；
Fig. 3 is doublet unit schematic diagram；
Fig. 4 is a period of time unit shown in figure one to deserved S parameter figure；
Fig. 5, Fig. 6 are unit feed Balun structure diagrams in left and right of the present invention；
Fig. 7 is the curvilinear coordinate axis schematic diagram on balun gradual change ground；
Fig. 8, Fig. 9 are the overall structure profiles of the present invention；
Figure 10 is the structural excitation feed port of the present invention corresponding standing-wave ratio figure in phi=0 Surface scans for the moment；
Figure 11 is the structural excitation feed port of the present invention corresponding standing-wave ratio figure in phi=90 Surface scans for the moment；
When Figure 12 is structural excitation feed port two of the present invention in phi=0 Surface scans corresponding standing-wave ratio figure；
Figure 13 is structural excitation feed port two of the present invention corresponding standing-wave ratio figure in phi=90 Surface scans.
Embodiment
Dual polarized antenna unit is made of orthogonally located single polarization doublet unit, and single polarization doublet unit includes
Doublet unit 2, medium substrate 3, transition balun 4, metal on wide angle matching layer 1, medium substrate 5, by coaxial feeding
Port 1 and feed port 27；The half-wave dipole subelement includes two monopoles in left and right, and each monopole includes even
Extremely sub- arm and interdigital section；The dipole arm of left and right two of the doublet unit is in the opening semicircle with opening to the right to the left respectively
Shape, semicircle opening connect interdigital section；Interdigital section of complementation of adjacent dipole subelement plugs together, and forms coupling (dipole impedance
Related to its shape, can be finely adjusted shape makes its impedance reach expected setting value)；The feed Balun by lowermost end triangle
Gradual change microstrip line part and the coplanar striplines of middle changeover portion and latter half, transition balun include upper strata ground wire, gradual change
Ground wire, signal wire；The upper strata ground wire and signal wire are located on the same face of medium substrate with doublet unit, upper strata ground wire
Connect the monopole of left and right two of doublet unit respectively with the upper end of signal wire；The signal wire is divided into two sections, and upper section is square
Shape composition parallel wire parallel with upper strata ground wire, lower section is microstrip line, and microstrip line line width gradually broadens to realize impedance transformation；Institute
State medium substrate and be equipped with some cycle vias, upper strata ground wire is by cycle via and the gradual change for being located at medium substrate another side
Line is connected, to realize that the impedance matching of gradual change and field match；Gradual change line width subtract from bottom to up with curvature gradient ramp gradual change
It is small, finally with upper strata ground wire equivalent width.
And the doublet unit upper end sets wide angle matching layer.
The gradual change ground wire uses curvature CV Curve gradual change, and line width tapers into from the bottom to top, finally with upper strata ground wire
Equivalent width.
Gradual change triangular in shape broadens (impedance from top to bottom from large to small) to the lower section microstrip line of the signal wire from top to bottom.
On the basis of the present invention is printed dipole antenna, by strengthening the coupling between dipole array element, reached with this
To the effect of spread bandwidth.Mainly it is made of two parts of interdigitated dipole array element and feeder line balun, feeder line balun is mainly real
Existing impedance matching and the matched function of electric field.Feeder line balun is mainly made of three parts：Coplanar two-wire part, is mainly
Give doublet unit balanced feeding；Transmission line portions, primarily to alleviating the spy that input impedance changes and changes with frequency
Property；The impedance value of 155 Ω, primarily to realizing impedance transformation, is changed into the output of 50 Ω, finally can by microstrip line part
The feed of more convenient antenna.
Technical scheme is described in further detail below in conjunction with the accompanying drawings.
The medium substrate of antenna array is Rogers 5880 (dielectric constant 2.2), as shown in Figure 1, structure of the present invention is by list
Polarize based on interdigitated close coupling unit, two single polarization units design composition dual-polarization cells by being engaged.And single polarization
Coupled between unit by complementary interdigital formed of rectangle, it is interdigital with a period of time the right and left dipole arm mirror symmetry (direction)
Section is complementary, and interdigital quantity and size are set according to actually required stiffness of coupling.A period of time, lower end connected coplanar two-wire to microstrip line
Transition balun, transition balun top is coplanar two-wire, and lower part is microstrip line input, and microstrip line progressively narrows from the bottom to top, gradually
Become ground line length and depend on working frequency range and bandwidth, gradual change form is curve gradual change.The covering of array element upper end is certain thickness
Dielectric layer, to improve antenna large-angle scanning performance, matches layer thickness and dielectric constant need to be by actual work as wide angle matching layer
Make the selection such as frequency range.
Fig. 2, Fig. 3 are close coupling a period of time cellular construction of the present invention, and the cycle in x directions and y directions is dx=
8.3mm, dy=10mm, sheet metal thickness h=0.762mm, the length L=23.646mm of dielectric-slab, metallic reflection plate is apart from a period of time
The top spacing hrf=14.823mm, the wide angle matching layer dielectric constant in a period of time upper end are 2.2, thickness h w=6.35mm.Close coupling
A period of time unit is printed on medium substrate intermediate layer, and interdigital section of interdigital number is 4, each interdigital length and width Lf=0.7mm, Wf=
0.5mm, upper and lower gap spacing are g1=0.25mm, between left and right away from for g2=0.2m, it is interdigital after pad width Wb=0.5mm, length Lb
=6mm.Dipole arm radius R=3mm, the center of circle to dipole arm symmetrical centre distance d=4.05mm, step-shaped transition section two-stage
Length and width are respectively W1=0.55mm, W2=1.5mm, L1=0.6mm, and the spacing between the two-arm of left and right is df=0.6mm, copper foil
Thickness t=0.018mm.A period of time Performance Simulation Results as shown in figure 4, close coupling a period of time it is inner in the frequency band of 1.6GHz to 8.5GHz
Oral reflex coefficient S 11 is less than -10dB, realizes 5.3:1 ultra wideband.
Fig. 5, Fig. 6 give a period of time cellular construction after connection balun, and balun upper end double structure is directly connected to dipole
On son, lower end inputs for 50 ohm microstrips.Two-wire spacing gf=0.3mm, line width Wdl=0.4mm, two-wire are located in medium substrate
Interbed, floor are located at substrate bottom, for upper strata the line length Lug=15.725mm on the left of two-wire, by periodicity via with
Bottom gradual change ground wire connects, and crosses pore radius Rt=0.15mm, totally 15, is spaced Lt=1.05mm, right-side signal line can be divided into two
Section, first segment are rectangle, and length Lsg1=14.725mm, width is two-wire line width Wdl, and second saves length Lsg2=5.646mm,
Line width is by the Wdl linear gradients of upside to downside Wms=1mm.Fig. 7 is gradual change ground wire, Transition length Ltr=
14.725mm, upside width are Wdl, downside width Wgnd=3.6mm, using the form of curve gradual change.
Fig. 8, Fig. 9 are the array format of dual-polarization cells composition.
According to above-described embodiment, it is bent that port standing-wave ratio as shown in Figure 10 to Figure 13 can be obtained using electromagnetic simulation software
Line, can be seen that on the premise of port standing-wave ratio is less than 3, the ultra wide bandwidth angle close coupling day shown in example one from the curve
Linear array, can realize the large-angle scanning performance in up to 45 ° of E faces and H faces, completely in the ultra wide band of 1.2GHz to 8.4GHz
Meet design requirement.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. dual polarization coupled dipole array antenna, it is characterised in that the aerial array includes some dual polarized antenna units,
The dual polarized antenna unit includes orthogonally located single polarization doublet unit, and the single polarization dipole includes interdigital section,
The described interdigital section form for being designed as mutually fastening；
The dual polarization dipole subelement includes the two orthogonal monopoles in left and right, and each monopole includes dipole arm and interdigital
Section；The dipole arm is half opening, and the outward opening of two dipole arms is set, and the opening connects interdigital section；Belong to
Interdigital section of complementation of same single polarization doublet unit plugs together, and forms coupling；
The single polarization doublet unit is with including wide angle matching layer, medium substrate, the doublet unit on medium substrate, metal
And feed Balun；The triangle gradual change microstrip line part of the feed Balun including lowermost end and middle transition portion and later half
Partial coplanar striplines, the transition portion balun include upper strata ground wire, gradual change ground wire, signal wire；The upper strata ground wire and letter
Number line is located on the same face of medium substrate with doublet unit, and the upper end of upper strata ground wire and signal wire connects dipole respectively
The monopole of left and right two of unit；The signal wire is divided into upper and lower two section, the upper section, lower section almost parallel with upper strata ground wire
For microstrip line, microstrip line line width gradually broadens to realize impedance transformation；The medium substrate is equipped with some cycle metallic vias,
Upper strata ground wire realizes conducting by cycle metallic vias with being connected positioned at the gradual change ground wire of medium substrate another side, to realize gradual change
Impedance matching and field matching；Gradual change line width from bottom to up with the gradual change of curvature gradient ramp reduce, finally with upper strata ground wire
Equivalent width.
2. dual polarization coupled dipole array antenna according to claim 1, it is characterised in that the doublet unit
Upper end sets wide angle matching layer, for improving scan characteristic.
3. dual polarization coupled dipole array antenna according to claim 2, it is characterised in that the gradual change ground wire makes
With curvature gradient rampGradual change, h_down in formula
Represent the height of whole gradient ramp, c_down, w_down represent the constant interval of transition line independent variable t respectively, and m represents gradual change
Bent curvature of a curve.
4. dual polarization coupled dipole array antenna according to claim 2, it is characterised in that if described interdigital section by
The dry interdigital composition of Continuous Rectangular.
5. dual polarization coupled dipole array antenna according to claim 2, it is characterised in that saved under the signal wire
Microstrip line is that the impedance for reaching coaxial line impedence to signal wire converts, and gradual change triangular in shape broadens micro belt line width from top to bottom.
6. dual polarization coupled dipole array antenna according to claim 2, it is characterised in that introduce 50 Europe resistance and add
Carry common mode resonance caused by the common mode current for eliminating between gradual change bottom line and metal ground and being produced at specific frequency point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720441202.9U CN207338627U (en) | 2017-04-25 | 2017-04-25 | Dual polarization coupled dipole array antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720441202.9U CN207338627U (en) | 2017-04-25 | 2017-04-25 | Dual polarization coupled dipole array antenna |
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| CN207338627U true CN207338627U (en) | 2018-05-08 |
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| CN201720441202.9U Expired - Fee Related CN207338627U (en) | 2017-04-25 | 2017-04-25 | Dual polarization coupled dipole array antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104277A (en) * | 2017-04-25 | 2017-08-29 | 南京航空航天大学 | Dual polarization coupled dipole array antenna |
| CN112467400A (en) * | 2020-11-20 | 2021-03-09 | 中国电子科技集团公司第三十八研究所 | Ultra-wideband dual-polarized phased array antenna |
| CN115117608A (en) * | 2022-07-05 | 2022-09-27 | 湖南航祥机电科技有限公司 | Tightly-coupled ultra-wideband dual-polarized phased array antenna |
-
2017
- 2017-04-25 CN CN201720441202.9U patent/CN207338627U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104277A (en) * | 2017-04-25 | 2017-08-29 | 南京航空航天大学 | Dual polarization coupled dipole array antenna |
| CN107104277B (en) * | 2017-04-25 | 2023-10-24 | 南京航空航天大学 | Dual polarized tightly coupled dipole array antenna |
| CN112467400A (en) * | 2020-11-20 | 2021-03-09 | 中国电子科技集团公司第三十八研究所 | Ultra-wideband dual-polarized phased array antenna |
| CN115117608A (en) * | 2022-07-05 | 2022-09-27 | 湖南航祥机电科技有限公司 | Tightly-coupled ultra-wideband dual-polarized phased array antenna |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180508 Termination date: 20210425 |
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| CF01 | Termination of patent right due to non-payment of annual fee |