CN106785405A - A kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates - Google Patents
A kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates Download PDFInfo
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- CN106785405A CN106785405A CN201710023780.5A CN201710023780A CN106785405A CN 106785405 A CN106785405 A CN 106785405A CN 201710023780 A CN201710023780 A CN 201710023780A CN 106785405 A CN106785405 A CN 106785405A
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- reflecting plates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- 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
-
- 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
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/108—Combination of a dipole with a plane reflecting surface
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
The invention discloses a kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates, including dual polarization plane dipole antenna, plastic support post, the part of AMC reflecting plates three.Dual polarization plane dipole antenna includes being from top to bottom successively coupled microstrip line, top dielectric plate, irradiation structure, coaxial line；AMC reflecting plates include from top to bottom be successively periodic arrangement rectangular patch, layer dielectric plate, air dielectric, metal support column, metallic plate；Coupled microstrip line and irradiation structure are located at the upper and lower both sides of top dielectric plate respectively by same placing direction, and ± 45 ° of dual polarizations are realized by the way of coaxial feeding.The dual polarization plane dipole antenna is fixed on AMC reflecting plates by four plastic support posts.The present invention replaces original metallic reflection plate using AMC reflecting plates, makes antenna section height from 0.264 λ2.2GHzIt is reduced to 0.132 λ2.2GHz, while the features such as remaining its broadband, high-isolation, low-cross polarization and low cost.Meet the application demand of present communications industry, meet the miniaturization trend of current base station antenna, with practical reference value.
Description
Technical field
The invention belongs to mobile communication technology field, particularly antenna of mobile communication base station design and manufacturing technology field,
It is related to a kind of low section dual polarization of loading AMC (Artificial Magnetic Conductor, artificial magnetic conductor) reflecting plate
Dipole antenna for base station.
Background technology
Antenna for base station as mobile base station core, the quality of its performance directly affects the matter of whole communication system
Amount.With the continuous expansion of wireless information transfer demand, the complexity of communication system also gradually increases.In order to adapt to current multiple
The nervous present situation of mobile communication standard long-term co-existence and base station covering of the fan position, antenna for base station is progressively towards dual polarization, wideband
And miniaturization, this is also the trend of following 5G Research on Communication Technology.The principle of dual polarized antenna is two secondary polarised direction phases
Mutually orthogonal antenna works in transmission duplex pattern simultaneously, is effective against multipath fading, increases capacity of communication system.
Traditional dual polarized antenna form typically has microband paste unit and doublet unit, and it respectively has excellent lacking.Micro-strip is pasted
Although blade unit section is relatively low, its narrower bandwidth, loss is larger, and application in a base station is restricted.And dipole list
Unit can meet the band limits demand of present communications by rationally design at aspects such as bandwidth.But according to image theory, all need
It is placed in the height apart from floor λ/4 and just can guarantee that the uniformity of its electric current, so as to obtains good performance.Such section high
The development trend of base station miniaturization is not met, the miniaturization for then studying dual polarized antenna turns into current focus.Dual polarization
The Miniaturization Design of dipole antenna is intended to reduce section height or reduces horizontal area.
AMC structures are a kind of periodic structures, and used as special electromagnetic material, its same phase reflection characteristic having can be used
The height of section is reduced in dual polarization dipole sub-antenna.But traditional AMC structures are narrower with mutually reflection phase bandwidth, 0
Degree reflected phase frequency is higher.Want to obtain broadband character with the loading of dual polarization dipole sub-antenna, while taking into account base station again
The features such as applying frequency scope of antenna, high-isolation, low-cross polarization, still in the presence of very big difficulty.
The content of the invention
In view of this, it is an object of the invention to provide a kind of low section dual polarization dipole subbase of loading AMC reflecting plates
Station antenna, it is therefore intended that the section height of dual polarization dipole subbase station antenna is reduced using the same phase reflection characteristic of AMC structures,
Therefore, proposing a kind of new A MC reflection board structures, the Miniaturization Design of the antenna is realized, maintain dual polarized antenna
The features such as broadband, high-isolation, low-cross polarization, enable to meet the application of current mobile communications base station.
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates, the antenna for base station is flat including dual polarization
Face dipole antenna, four plastic support posts, the parts of AMC reflecting plates three；
The dual polarization plane dipole antenna include set gradually from top to bottom coupled microstrip line, top dielectric plate,
Irradiation structure, coaxial line；The coupled microstrip line and coaxial line constitute the feed structure of the antenna；The coupled microstrip line and spoke
Penetrate structure and be located at top dielectric plate upper and lower surface respectively by same placing direction；The coaxial line passes through AMC reflecting plates, its inner core
It is connected with coupled microstrip line, outer core is connected with irradiation structure；
The AMC reflecting plates include set gradually from top to bottom rectangular patch part, layer dielectric plate, air dielectric,
Four metal support columns, metallic plates；The dual polarization plane dipole antenna is fixed on AMC and reflects by four plastic support posts
On plate.
Further, the coupled microstrip line includes+45 ° of T-shape coupled microstrip lines and -45 ° of T-shape coupled microstrip lines, hangs down
Orthogonal misplaces in top dielectric plate upper table face diagonal center, and T-shape end is connected with two coaxial line inner cores respectively；
- 45 ° of T-shapes coupled microstrip line is in order to avoid the weight with+45 ° of T-shape coupled microstrip lines geographically
It is folded, it is divided into microstrip line one, probe one, microstrip line two, three or five parts of probe two and microstrip line；The microstrip line one, microstrip line
Three are overlying on top dielectric plate upper surface, and microstrip line two is located at the 1mm of top dielectric plate lower section；The probe one and probe two pass through
Two non-metallic through holes being provided with top dielectric plate, the two ends of microstrip line two are connected with microstrip line one, microstrip line three respectively
Connect.
Further, the top dielectric plate is rectangle, and thickness is 0.5mm, and area is 60mm × 60mm；On top dielectric plate
Face is provided with four non-metallic through holes of identical two-by-two, and the small through hole of two of which passes through probe one and probe two, and two big
Through hole passes through two coaxial lines.
Further, the irradiation structure includes+45 ° of butterfly oscillators and -45 ° of butterfly oscillators, and coupled microstrip line by correspondence
Direction vertical interlaced is located at top dielectric plate lower surface；Each butterfly oscillator includes two oscillator arms being centrosymmetric, upper
Layer dielectric-slab lower surface is put centrally along diagonal positions；
The oscillator arms constitute class sector structure, semicircle diameter by a semicircular patch and an isosceles trapezoid paster
Coincided with isosceles trapezoid base；According to dipole antenna principle, the sum high of semicircular radius and isosceles trapezoid is
27mm；
" U " type groove is all etched in the oscillator arms, its recess points to center；Wherein ,+45 ° of butterfly oscillators and-
45 ° of butterfly oscillators respectively have an oscillator arms to be connected with the outer core of coaxial line.
Further, four plastic support posts are hexagonal prism, are separately fixed under four drift angles of top dielectric plate
Side, its height (i.e. the distance of top dielectric plate and layer dielectric plate) is consistent, and value is 4.5mm.
Further, the rectangular patch part is located at the upper surface of layer dielectric plate, is pasted by 11 × 11 identical rectangles
Piece is formed in periodic arrangement；For convenience of feeding, cast out the rectangular patch at the row of the 6th row the 6th.The length of side of each rectangular patch is
12mm, spacing span is in 3.3mm between rectangular patch.
Further, the layer dielectric plate is rectangle, and thickness is 1mm, and area is 171.6mm × 171.6mm；It is provided with above
Two non-metallic through holes of identical, may pass through two coaxial lines.
Further, the air dielectric Thickness is 13mm.
Further, four metal support columns are hexagonal prism, are separately fixed under four drift angles of layer dielectric plate
Side, its height (i.e. the distance of layer dielectric plate and metallic plate) is consistent, and identical with air dielectric thickness, value is 13mm.
Further, the metallic plate is rectangular planar structure, and area is 171.6mm × 171.6mm；Two phases are provided with thereon
Same non-metallic through hole, it is corresponding with two lead to the hole site on layer dielectric plate, it is used to through two coaxial lines；The metallic plate
Using aluminum material, also can be using the metal material such as copper.
The beneficial effects of the present invention are：
1) coupled microstrip line uses T-shape structure, is conducive to the expansion of antenna operating band.To avoid physically
Overlap, two ± 45 ° of T-shape coupled microstrip lines are staggered in the form of air bridges, also dropped while isolation between antennas is improved
Low traditional base station antenna using multilayer stack structure complexity.Additionally, coaxial line directly feeds to it so that processing system
Make more simple.
2) butterfly oscillator of two ± 45 ° of intersections represents ± 45 ° of polarization respectively.When a polarization job, another polarization
Representative butterfly oscillator adds oscillator arms with the fan-shaped structure design of class equivalent to parasitic patch, is all conducive to Antenna Operation
The expansion of frequency band.
3) " U " type groove in oscillator arms, thus it is possible to vary the current path of chip surface, by reasonable adjusting " U " type groove
Physical dimension, can be effectively improved the impedance matching of antenna.
4) the AMC reflecting plates are improved in traditional AMC structures, to meet the low frequency wide band characteristic of point, this
Based on invention proposition is used without via AMC structures, middle medium substrate is changed into air dielectric, while considering in kind adding
, it is necessary to by the top layer of air dielectric layer dielectric plate, bottom is realized with metallic plate, both rely on four metal column branch to work
Support.Such design causes that processing is relatively simple, and cost is substantially reduced.
5) the antenna All Media plate all uses FR4 sheet materials, low manufacture cost.And dual polarization dipole sub-antenna uses plane
Structure so that antenna compact overall structure.
6) antenna replaces original metallic reflection plate using improved AMC reflecting plates, there is substantially drop on whole height
It is low, highly from 0.264 λ2.2GHzIt is reduced to 0.132 λ2.2GHz.And the working band of antenna, isolation, cross polarization and gain are simultaneously
Do not therefore suffer from having a strong impact on, still disclosure satisfy that the application of current mobile communications base station.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carries out
Explanation：
Fig. 1 is overall structure diagram of the present invention；
Fig. 2 is dual polarization plane dipole antenna configuration schematic diagram of the present invention；
Fig. 3 is coupled microstrip line schematic diagram of the present invention；
Fig. 4 is irradiation structure schematic diagram of the present invention；
Fig. 5 is AMC reflection board structures schematic diagram of the present invention；
Fig. 6 is the standing-wave ratio (VSWR) and gain (Gain) curve map of embodiment of the present invention middle port one and port two；
Fig. 7 is isolation (S between two-port in the embodiment of the present invention21) curve map；
Fig. 8 is embodiment of the present invention middle port one in the E faces of 2.2GHz and H faces directional diagram.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 is overall structure diagram of the present invention, as shown in figure 1, a kind of loading AMC reflecting plates of present invention offer is low
Profile dual-polarized dipole antenna for base station, including dual polarization plane dipole antenna 1, plastic support post 2, AMC reflecting plates 3 three
Point.The dual polarization plane dipole antenna includes it being successively from top to bottom coupled microstrip line 11, top dielectric plate 12, radiation knot
Structure 13, coaxial line 14.The AMC reflecting plates include from top to bottom be successively periodic arrangement rectangular patch 31, layer dielectric plate
32nd, air dielectric 33, metal support column 34, metallic plate 35.The dual polarization plane dipole antenna 1 relies on four identical plastics
Support column 2 is fixed on AMC reflecting plates 3.The plastic support post 2 is hexagonal prism, is highly 4.5mm.
As shown in Fig. 2 the dual polarization plane dipole antenna includes being from top to bottom successively coupled microstrip line 11, upper strata
Dielectric-slab 12, irradiation structure 13, coaxial line 14.The coupled microstrip line 11 is mutual along the diagonal of top dielectric plate 2 including two
The orthogonal T-shape microstrip line put, positioned at the center of top dielectric plate 12.The top dielectric plate 12 uses FR4 sheet materials, is situated between
Electric constant is 4.4, and loss tangent angle is 0.02, and thickness is 0.5mm, is shaped as the rectangle of 60mm × 60mm.Four are provided with thereon
The non-metallic through hole of identical two-by-two, two small through holes pass through probe 112 and probe 114, two big through holes to pass through two
Coaxial line 14.The irradiation structure 13 includes two secondary mutually orthogonal butterfly oscillators, vertical by the correspondence direction of coupled microstrip line 11
Staggeredly it is located at the lower surface of top dielectric plate 12.During feed, coupled by coupled microstrip line 11 and form ± 45 ° of dual polarizations.Described two
Root coaxial line 14 directly feeds through AMC reflecting plates 3 to coupled microstrip line 11.Lower termination feed, upper end inner core with couple
Microstrip line 11 is welded, and outer core is welded with irradiation structure 13.Its characteristic impedance is 50 ohm.
As shown in figure 3, the coupled microstrip line 11 includes two T-shape coupled microstrip lines.Intersect in ± 45 ° and be located at upper strata
- 45 ° of T-shape coupled microstrip lines to avoid overlap physically, therefore are divided into micro-strip by the upper surface center of dielectric-slab 12
Line 1, probe 1, microstrip line 2 113,3 115 5 parts of probe 2 114 and microstrip line.The microstrip line 1,
Microstrip line 3 115 is overlying on top dielectric plate upper surface, and microstrip line 2 113 is located at hanging at the lower section 1mm of top dielectric plate 12.It is described
Probe 1 and probe 2 113 through top dielectric plate 12 by microstrip line 1 and microstrip line 3 115 respectively with microstrip line two
113 two ends are connected.
As shown in figure 4, the irradiation structure 13 includes two mutually orthogonal ± 45 ° butterfly oscillators, wherein oscillator arms 131
It is+45 ° of butterfly oscillators with 133, oscillator arms 132 and 134 are -45 ° of butterfly oscillators.Each oscillator arms shape is identical, is all by one
Individual isosceles trapezoid and a class sector structure for semicircle composition, according to half-wave dipole principle, take a height of 11.9mm of isosceles trapezoid, and half
Radius of circle is 15.1mm." U " type groove 135,136,137,138 is etched in oscillator arms 131,132,133,134 respectively, and recess refers to
To center." U " type groove side 14.7mm long, bottom side length 17.5mm, line width is 2.1mm.One is also respectively provided with oscillator arms 131,132
Individual circular hole 130,139, is used to weld two big non-metallic through holes pair of the outer core of coaxial line, position and top dielectric plate 12
Should.Wherein circular hole 130 represents+45 ° of polarization, is defined as port one；Circular hole 139 represents -45 ° of polarization, is defined as port two.
As shown in figure 5, the AMC reflecting plates are including being successively from top to bottom that the rectangular patch 31, lower floor of periodic arrangement is situated between
Scutum 32, air dielectric 33, metal support column 34, metallic plate 35.The rectangular patch 31 includes 11 × 11 identical rectangles
Chip unit, overlays on the upper surface of layer dielectric plate 32, wherein being disturbed in view of feed, casts out the rectangular patch at the row of the 6th row the 6th
Unit.The a length of 12mm of rectangular patch element sides, adjacent cells spacing 3.3mm.Layer dielectric plate 32 uses FR4 sheet materials, and dielectric is normal
Number is 4.4, and loss tangent angle is 0.02, and thickness is 1mm, is shaped as the rectangle of 171.6mm × 171.6mm.Two are provided with thereon
The non-metallic through hole 321,322 of identical, it is corresponding with circular hole 130,139, it is used to through coaxial line.The air dielectric 33 is located at
In the middle of layer dielectric plate 32 and metallic plate 35, thickness is 13mm., it is necessary to 4 metal columns are used as layer dielectric in reality processing
Support between plate 32 and metallic plate 35.The metal support column 34 is hexagonal prism, is highly 13mm, is fixed on layer dielectric plate
32 four drift angles lower section.The metallic plate 35 is shaped as the rectangle of 171.6mm × 171.6mm, and two identicals are provided with thereon
Non-metallic through hole, corresponds with through hole 321,322, is also used to through coaxial line.The metallic plate uses aluminum material, also may be used
Metal material is waited using copper.
Fig. 6, Fig. 7, Fig. 8 are the correlated performance measured datas of the embodiment of the present invention.Fig. 6 be embodiment of the present invention port one,
The standing-wave ratio and gain measured curve figure of port two.As can be seen that port one, two can in 1.65GHz-2.82GHz frequency ranges
Meet VSWR<2, relative bandwidth is 52.3%, and two-port actual measurement average gain is 7.76dBi, and its consistency is preferable.Fig. 7 is
The interport isolation S21 measured curve figures of the embodiment of the present invention, in 1.7GHz-2.7GHz frequency ranges, the simulation results are all small
In -30dB, isolation characteristic is good.Fig. 8 is actual measurement directional diagram of the embodiment of the present invention middle port one in 2.2GHz, due to the antenna
The symmetry of structure, two-port difference is smaller, can be seen in the E faces of 2.2GHz and H faces directional diagram only to exit port one here
Go out, antenna cross-polarization be less than -27dB, a width of 60 ° ± 5 ° of half-power beam band, each test index disclosure satisfy that present communications
Industry requirement.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment to be described in detail the present invention, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (10)
1. a kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates, it is characterised in that：The antenna for base station includes
Dual polarization plane dipole antenna, four plastic support posts, the parts of AMC reflecting plates three；
The dual polarization plane dipole antenna includes the coupled microstrip line, top dielectric plate, the radiation that set gradually from top to bottom
Structure, coaxial line；The coupled microstrip line and coaxial line constitute the feed structure of the antenna；The coupled microstrip line and radiation are tied
Structure is located at top dielectric plate upper and lower surface respectively by same placing direction；The coaxial line passes through AMC reflecting plates, its inner core and coupling
Close microstrip line to be connected, outer core is connected with irradiation structure；
The AMC reflecting plates include set gradually from top to bottom rectangular patch part, layer dielectric plate, air dielectric, four
Metal support column, metallic plate；The dual polarization plane dipole antenna is fixed on AMC reflecting plates by four plastic support posts
On.
2. a kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates according to claim 1, its feature
It is：The coupled microstrip line includes+45 ° of T-shape coupled microstrip lines and -45 ° of T-shape coupled microstrip lines, and vertical interlaced is located at
Top dielectric plate upper table face diagonal center, T-shape end is connected with two coaxial line inner cores respectively；
- 45 ° of T-shapes coupled microstrip line in order to avoid with+45 ° of T-shape coupled microstrip lines geographically overlap, point
It is microstrip line one, probe one, microstrip line two, three or five parts of probe two and microstrip line；The microstrip line one, microstrip line three are overlying on
Top dielectric plate upper surface, microstrip line two is located at the 1mm of top dielectric plate lower section；The probe one and probe two are situated between by upper strata
Two non-metallic through holes being provided with scutum, the two ends of microstrip line two are connected with microstrip line one, microstrip line three respectively.
3. a kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates according to claim 2, its feature
It is：The top dielectric plate is rectangle, and thickness is 0.5mm, and area is 60mm × 60mm；Four are provided with above top dielectric plate
The non-metallic through hole of identical two-by-two, the small through hole of two of which passes through probe one and probe two, two big through holes to pass through two
Root coaxial line.
4. a kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates according to claim 3, its feature
It is：The irradiation structure includes+45 ° of butterfly oscillators and -45 ° of butterfly oscillators, and coupled microstrip line is vertically handed over by correspondence direction
Misplace in top dielectric plate lower surface；Each butterfly oscillator includes two oscillator arms being centrosymmetric, under top dielectric plate
Centre of surface diagonally put by position；
The oscillator arms constitute class sector structure by a semicircular patch and an isosceles trapezoid paster, semicircle diameter with etc.
The trapezoidal base of waist coincides；The sum high of semicircular radius and isosceles trapezoid is 27mm；
" U " type groove is all etched in the oscillator arms, its recess points to center；Wherein ,+45 ° of butterfly oscillators and -45 ° of butterflies
Shape oscillator respectively has an oscillator arms to be connected with the outer core of coaxial line.
5. a kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates according to claim 4, its feature
It is：Four plastic support posts are hexagonal prism, are separately fixed at four drift angles lower section of top dielectric plate, its height one
Cause, value is 4.5mm.
6. a kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates according to claim 5, its feature
It is：The rectangular patch part is located at the upper surface of layer dielectric plate, by 11 × 11 identical rectangular patches in periodically
Arrangement is formed；The length of side of each rectangular patch is 12mm, and spacing span is in 3.3mm between rectangular patch.
7. a kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates according to claim 6, its feature
It is：The layer dielectric plate is rectangle, and thickness is 1mm, and area is 171.6mm × 171.6mm；Two identicals are provided with above
Non-metallic through hole, may pass through two coaxial lines.
8. a kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates according to claim 7, its feature
It is：The air dielectric Thickness is 13mm.
9. a kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates according to claim 8, its feature
It is：Four metal support columns are hexagonal prism, are separately fixed at four drift angles lower section of layer dielectric plate, its height one
Cause, identical with air dielectric thickness, value is 13mm.
10. the low section dual polarization dipole subbase station antenna of a kind of loading AMC reflecting plates according to claim 9, it is special
Levy and be：The metallic plate is rectangular planar structure, and area is 171.6mm × 171.6mm；Two non-gold of identical are provided with thereon
Categoryization through hole, it is corresponding with two lead to the hole site on layer dielectric plate, it is used to through two coaxial lines；The metallic plate uses aluminum
Material, also can be using the metal material such as copper.
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