CN109904593A - A kind of frequency band enhancing Bipolarization antenna for base station - Google Patents
A kind of frequency band enhancing Bipolarization antenna for base station Download PDFInfo
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- CN109904593A CN109904593A CN201910144602.7A CN201910144602A CN109904593A CN 109904593 A CN109904593 A CN 109904593A CN 201910144602 A CN201910144602 A CN 201910144602A CN 109904593 A CN109904593 A CN 109904593A
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Abstract
The invention discloses a kind of frequency bands to enhance Bipolarization antenna for base station, including reflecting plate, support construction, radiating element and parasitic element, the radiating element is fixed on above reflecting plate by support construction, the parasitic element is fixed on above radiating element by insulated column, the radiating element includes four radiation arms and medium substrate, first radiation arm, 4th radiation arm constitutes+45 ° of polarization oscillators, second radiation arm, third radiation arm constitutes -45 ° of polarization oscillators, four radiation arms are constituted by the metal patch for being located at medium substrate upper surface and positioned at the metallic screw of metal patch apex angle, the metal patch end is provided with angle-style gap, the support construction includes the balun coupling circuit plate and medium bottom plate that two pieces of square crossings are placed, the balun coupling circuit plate is fixed on medium bottom plate, it is given an account of Matter bottom plate is fixed on reflecting plate by plastic rivet, and the parasitic element includes circular metal plate and four cross metal arms.The antenna has the advantages that wide bandwidth, high isolation, high-gain, directional diagram horizontal beam width stability is high, is easily assembled welding.
Description
Technical field
The present invention relates to mobile communication fields, and in particular to a kind of width suitable for IMT/2G/3G/4G mobile communication system
Band antenna for base station.
Background technique
With the development of mobile communication technology, commercial city is runed in the compatible IMT(1427MHz- of development deployment in countries in the world
1515MHz) and 2G/3G/4G(1710MHz-2690MHz) communication system.And current Bipolarization antenna for base station is only capable of covering
2G/3G/4G frequency range, if the same antenna can realize IMT/2G/3G/4G frequency range all standing, will greatly reduce antenna amount and
Improve space efficiency utilization.Therefore, the high-performance bipolar antenna for base station for designing a bandwidth covering IMT/2G/3G/4G has
Great commercial value.
The high-performance bipolar antenna for base station for designing a bandwidth covering IMT/2G/3G/4G will not only be such that impedance bandwidth expires
Foot requires, and also needs to ensure radiating antenna directional diagram and heteropolar isolation with interior with good performance.At the same time, it is desirable to
Antenna size compares traditional Bipolarization antenna for base station, and there is only the size increases in frequency transformation.
There are many defects during realizing broadband for traditional Bipolarization antenna for base station.First, traditional is bipolar
Change antenna for base station and utilize coupled resonance characteristic between half-wave dipole resonance and two pairs of orthogonal half-wave dipoles, forms two resonance points, it is real
The covering of existing 1710-2690MHz frequency range.But 1427MHz-2690MHz frequency range is faced, traditional double resonance point can not cover
So wide bandwidth, needs to redesign antenna structure.Second, to guarantee that antenna is interior with good stationary wave characteristic and different in band
Polarization isolation needs to improve using the methods of parasitic, coupling and load the stability and radiation current of antenna feed impedance
Orthogonality.Third, antenna physical size are proportional to lowest operating frequency, as bandwidth of operation low frequency is displaced downwardly to 1427MHz, antenna
Physical size necessarily increases.But the increase of radiating element bore, the horizontal plane beam angle that will lead to high frequency direction figure narrow, drop
Directional diagram stability in low strap.
107799886 A of patent CN discloses a kind of novel spread wideband antenna for base station, U-shaped gap described in the antenna
Arc section is located at the center of radiation arm, and opening direction is towards semicircular patch, and opening width and semicircular patch
It is corresponding；The coupling unit is made of three circular metal plates, three circular metal plate longitudinal arrangements.The invention coupling unit
It is made of three layers of circular metal plate, needs additional mounting fixing parts, increase antenna complex degree.Meanwhile using four radiation arms point
Not Wei Yu medium substrate upper and lower surface, cause coaxial feeder soldering reliability decline.
107196039 A of patent CN discloses a kind of bandwidth expansion wide bandwidth base station antenna, and the first coupling described in the antenna is single
Member 2 includes several parasitic patch 2A and ring polygonized structure 2B；The third coupling unit 4 is a circular ring structure, is located at institute
State the surface of antenna radiator 1；Second coupling unit 3 is four metal rectangular items, vertically stands on first coupling
The surrounding of 2 middle ring polygonized structure 2B of unit.The invention increases the different coupling unit of multiple groups, increases antenna opening diametric plane size,
Lead to obtain antenna structure complexity, is unfavorable for actual product application.
Summary of the invention
In order to overcome the shortcomings of the prior art, the present invention provides a kind of novel frequency bands to enhance double-polarized base station day
Line, the Antenna Operation bandwidth cover 1400MHz-2800MHz, have wide bandwidth, high isolation, high-gain, directional diagram horizontal beam
The high advantage of width stability.
The present invention adopts the following technical scheme:
A kind of frequency band enhancing Bipolarization antenna for base station, including reflecting plate, support construction, radiating element and parasitic element, the spoke
Unit to be penetrated to be fixed on above reflecting plate by support construction, the parasitic element is fixed on above radiating element by insulated column,
It is characterized by: the radiating element include medium substrate and the first radiation arm on medium substrate, the second radiation arm,
Third radiation arm and the 4th radiation arm, first radiation arm, the second radiation arm, third radiation arm and the 4th radiation arm are about spoke
Penetrate unit center rotational symmetry；First radiation arm and third radiation arm constitute+45 ° of polarization oscillators, second radiation arm
- 45 ° of polarization oscillators are constituted with the 4th radiation arm；Four radiation arms are inside by metal patch and positioned at metal patch apex angle
The metal column of first position is constituted, and the inside second position of the apex angle of the metal patch, which is also provided with the second position, is
The gap with symmetrical structure of the heart, the gap have the extended segment for being parallel to the metal patch side, symmetrical two extensions
Section is crossed to form with towards the opening at radiating element center；The parasitic element includes circular metal plate and four metal arms, institute
Four metal arms are stated about circular metal plate rotational symmetry；Four metal arms are corresponding with the position of four radiation arms.
The present invention on metal patch by opening up the seam that there is opening to be directed toward radiating element center formed by extended segment
Gap changes terminal current distribution excitation third higher mode, is expanding bandwidth with interior generation third resonance point.Pass through metal patch top
Welded corner joint metal column increases current path and reduces antenna size, and stabilising direction figure horizontal beam width increases gain simultaneously.
The first position and the second position are respectively positioned on the line between radiating element center and metal patch apex angle, institute
The distance for stating first position to the metal patch apex angle is less than the second position to the distance of the metal patch apex angle.
The parasitic element center and radiating element center are located on same axis, and the parasitic element is solid by insulated column
It is scheduled on above radiating element, distance is 0.15-0.25 λ；The circular metal plate diameter is 0.15-0.25 λ, and λ is Antenna Operation
Centre frequency 2.1GHz corresponds to vacuum wavelength.It is designed using parasitic circular metal plate, while improving band internal impedance stationarity
Parasitic element height and complexity are reduced, is reduced because pattern distortion caused by parasitic element and horizontal beam width deteriorate.
The gap length is 0.25-0.55 λ, and width is 0.001-0.1 λ.
The radiating element and reflecting plate distance are 0.2-0.4 λ.
Distance is gradually increased outward by radiating element center between adjacent two metal patch, on the metal patch side
At edge, increase range rate.Pass through the design of radiation arm spacing gradual change, stabilized zone internal impedance change rate.
The support construction includes the first balun coupling circuit plate, the second balun coupling circuit plate and medium bottom plate；It is described
First balun coupling circuit plate and the second balun coupling circuit plate square crossing are placed, and axis is aligned with radiating element center；
The first balun coupling circuit plate include the first Γ shape metal patch, the first rectangular metal, third rectangular metal and the
One medium substrate, the second balun coupling circuit plate include the 2nd Γ shape metal patch, the second rectangular metal, the 4th rectangle
Metal and second medium substrate, the first Γ shape metal patch and the first rectangular metal, third rectangular metal respectively
Be printed on first medium substrate front and rear surfaces, the 2nd Γ shape metal patch and the second rectangular metal, the 4th rectangular metal
Ground is printed on second medium substrate front and rear surfaces respectively, and the first balun coupling circuit plate and the second balun coupling circuit plate are solid
It is scheduled on medium bottom plate, the medium bottom plate is fixed on reflecting plate；The first rectangular metal overground part, third rectangular metal
Overground part is connect with first radiation arm, third radiation arm respectively, the second rectangular metal overground part, the 4th rectangular metal
Overground part is connected respectively at second radiation arm, the 4th radiation arm, the first rectangular metal underground part, the second rectangular metal
Underground part, third rectangular metal underground part and the 4th rectangular metal underground part are connect with medium lower surface of base plate；First Γ
Shape metal patch by the first rectangular metal, third rectangular metal ground couple feed, realize that+45 ° of polarization oscillators motivate；
The 2nd Γ shape metal patch by the second rectangular metal, the 4th rectangular metal ground couple feed, realize -45 ° of polarization
Oscillator excitation.By coupling feed way solve electric current it is non-equilibrium-balance conversion on the basis of, simplify assemble welding mistake
Journey, it is ensured that soldering reliability reduces and the cascade complexity of secondary circuit simultaneously.
The first Γ shape metal patch and the 2nd Γ shape metal patch are in same rotation direction.
The metal arm is cross metal arm, and four cross metal arms are located at right above four radiation arms, institute
Cross metal arm is stated to be aligned with radiation arm axis.
Four cross metal arms are located at right above four radiation arms, the cross metal arm and radiation arm
Axis alignment, the design connected using cross metal arm with circular metal plate generate orthogonal induced current, inhibit near field heteropolar
Change radiation, improves heteropolar interport isolation；
The present invention has the following advantages and effects with respect to the prior art:
1,1400-2800MHz is completely covered in bandwidth of the present invention, is applicable not only to 2G/3G/LTE (4G) system and applies also for IMT
System.
2, structure of the invention is novel, have wide bandwidth, high isolation, high-gain, directional diagram horizontal beam width stability it is high,
The advantages of being easily assembled welding.
3, the design between the logical metal patch of the present invention apart from gradual change, stabilized zone internal impedance change rate, optimization band standing internal wave
Characteristic.
4, the present invention opens up angle-style gap by metal patch end, is not increasing radiating element complexity and is deteriorating surface electricity
Under the premise of stream, change terminal current distribution excitation third higher mode, expands bandwidth realizing with interior generation third resonance point
Target.
5, the present invention increases current path and reduces antenna size, surely by metal patch apex angle welding metal column such as screw
Determine directional diagram horizontal beam width while increasing gain.
6, the present invention is reduced parasitic while improving band internal impedance stationarity using the design of parasitic circular metal plate
Cell height and complexity are reduced because pattern distortion caused by parasitic element and horizontal beam width deteriorate.
7, the design that the present invention is connected using cross metal arm with circular metal plate, the orthogonal induced current of generation, suppression
The heteropolar radiation near field processed, improves heteropolar interport isolation.
8, the present invention use balun coupling feed way, solve electric current it is non-equilibrium-balance conversion on the basis of, simplify
Welding and assembling process, it is ensured that soldering reliability reduces and the cascade complexity of secondary circuit simultaneously.
Detailed description of the invention
Fig. 1 show a kind of tomograph of the enhanced Bipolarization antenna for base station of frequency band of the present invention；
Fig. 2 show a kind of side view of the enhanced Bipolarization antenna for base station of frequency band of the present invention；
Fig. 3 show a kind of top view of the enhanced Bipolarization antenna for base station of frequency band of the present invention；
It is a kind of hardened composition of couple feed of the enhanced Bipolarization antenna for base station of frequency band of the present invention described in Fig. 4, wherein a is first
The hardened composition of balun couple feed, b are the second hardened composition of balun couple feed；
Fig. 5 show the standing wave of the embodiment of the present invention；
Fig. 6 show the isolation of the embodiment of the present invention；
Fig. 7 show the horizontal radiation pattern of the embodiment of the present invention；
Fig. 8 show the standing wave of following three kinds of situations: situation 1: having angle-style gap to have parasitic element (embodiment of the present invention), situation
2 have angle-style gap without parasitic element, and situation 3 is without angle-style gap without parasitic element；
Fig. 9 show standing wave of the embodiment of the present invention and angle-style gap length change curve；
Figure 10 show standing wave of the embodiment of the present invention and parasitic element height change curve；
Figure 11 show standing wave of the embodiment of the present invention and parasitic element radius change curve.
Specific embodiment
Below with reference to examples and drawings, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
A kind of novel enhanced Bipolarization antenna for base station of frequency band shown in Fig. 1-3, including reflecting plate 1, support construction 2, radiation
Unit 3 and parasitic element 4, the radiating element 3 are fixed on 1 top of reflecting plate by support construction 2, and the parasitic element 4 is logical
It crosses insulated column and is fixed on 3 top of radiating element.
Radiating element 3 includes the first radiation arm 31A, the second radiation arm 31B, third radiation arm 31C, the 4th radiation arm 31D
With medium substrate 32, medium substrate 32 uses TXL high frequency plate, dielectric constant 2.65, thickness 1mm.
First radiation arm 31A, third radiation arm 31C constitute+45 ° of polarization oscillators, the second radiation arm 31B, the 4th radiation arm
31D constitutes -45 ° of polarization oscillators.
Four radiation arms are by the metal patch 311 for being located at 32 upper surface of medium substrate and positioned at the gold of metal patch apex angle
Belong to screw 312 to constitute, is provided with angle-style gap 313 in 311 end of metal patch, metal patch diagonal line length is 49mm.
Support construction 2 includes the first balun coupling circuit plate 21A, the second balun coupling circuit plate 21B and medium bottom plate 22.
The first balun coupling circuit plate 21A includes the first Γ shape metal patch 211A, the first rectangular metal ground 212A, third rectangle
Metal 212C and first medium substrate 213A, the second balun coupling circuit plate 21B include the 2nd Γ shape metal patch
211B, the second rectangular metal ground 212B, the 4th rectangular metal ground 212D and second medium substrate 213B, the first Γ shape metal
Patch 211A and first, third rectangular metal 212A, 212C be printed on first medium substrate 213A front and rear surfaces respectively, it is described
2nd Γ shape metal patch 211B and second, the 4th rectangular metal 212B, 212D be printed on second medium substrate 213B respectively
Front and rear surfaces, described first, second balun coupling circuit plate 21A, 21B are fixed on medium bottom plate 22, the medium bottom plate 22
It is fixed on reflecting plate 1 by plastic rivet；
The parasitic element 4 includes circular metal plate 41 and four cross metal arms 41, four cross metal arms 42
About 41 rotational symmetry of circular metal plate.
The first radiation arm 31A, the second radiation arm 31B, third radiation arm 31C, the 4th radiation arm 31D are single about radiation
First center rotational symmetry.
Distance is gradually increased outward by radiating element center between the metal patch, in the metal patch edge,
Increase range rate, passes through the design of radiation arm spacing gradual change, stabilized zone internal impedance change rate.
The angle-style gap 313 is located at 311 axial end of metal patch, and opening direction is towards in radiating element
The heart, 313 length of angle-style gap are that 44mm, width 2mm change terminal current distribution and motivate by opening up angle-style gap
Third higher mode, with generation third resonance point near interior 2.7GHz.
The metallic screw 312 is 9mm long to be welded in metal patch apex angle, and vertical with metal patch 311, is pasted by metal
Piece apex angle welding metal screw increases current path and reduces antenna size, stabilising direction figure horizontal beam width and increase gain.
The first Γ shape metal patch 211A and the 2nd Γ shape metal patch 211B are in same rotation direction.
The first balun coupling circuit plate 21A and the second balun coupling circuit plate 21B square crossing are placed, axis with
The alignment of 3 center of radiating element；
Described first, third rectangular metal the top 212A, 212C respectively at described first, third radiation arm 31A, 31C connect,
Described second, the 4th rectangular metal the top 212B, 212D respectively at described second, the 4th radiation arm 31B, 31D connection, it is described
First, second, third, fourth rectangular metal the lower part 212A, 212B, 212C, 212D connect with 22 lower surface of medium bottom plate；
The first Γ shape metal patch 211A by first, third rectangular metal 212A, 212C couple feed, realize+
45 ° of polarization oscillator excitations, the 2nd Γ shape metal patch 211B pass through to the second, the 4th rectangular metal 212B, 212D coupling
Close feed, realize the excitation of -45 ° of polarization oscillators, by coupling feed way solve electric current it is non-equilibrium-basis of conversion that balances
On, simplify welding and assembling process, it is ensured that soldering reliability reduces and the cascade complexity of secondary circuit simultaneously；
The parasitic element 4 is fixed on the top of radiating element 3 by insulated column, and distance is 22mm, 4 center of parasitic element with
3 center of radiating element is located on same axis, and 41 diameter of circular metal plate is 32mm, is set using parasitic circular metal plate
On the one hand meter reduces parasitic element height and complexity while improving band internal impedance stationarity, realizes 1427-2690MHz
On the other hand band standing internal wave < 1.4 is reduced because pattern distortion caused by parasitic element and horizontal beam width deteriorate.
Four cross metal arms 42 are located at right above four radiation arms 31, the cross metal arm 42 with
The alignment of radiation arm axis, cross metal arm lengths 15mm, the width 2mm, using cross metal arm and circular metal plate
The design of connection generates orthogonal induced current, inhibits the heteropolar radiation near field to improve heteropolar interport isolation, with interior isolation
< -37dB is much better than similar antenna；
The radiating element 3 and reflecting plate 1 are apart from for 37mm.
The present invention compares 107799886 A of patent CN and expands bandwidth using distinct methods, while overcoming due to coupling unit
The problem of the excessive bring assembly difficulty of the number of plies and the welding of the second feed line and coaxial cable outer conductor.
The present invention compares 107196039 A of patent CN and expands bandwidth using distinct methods, while improving due to multiple groups coupling
Close the excessive problem of unit bring antenna size.
Shown in Fig. 5, for the embodiment of the present invention ± 45 ° polarization port standing wave.Working band of the embodiment of the present invention as shown in Figure 5
Cover 1400-2800MHz, dual-port standing wave < 1.5.
Shown in Fig. 6, it is isolated between the polarization port of the embodiment of the present invention ± 45 °.The embodiment of the present invention exists as shown in Figure 6
In 1400-2800MHz bandwidth, isolation < -37dB.
It is+45 ° of polarization port levels directional diagrams of the embodiment of the present invention shown in Fig. 7.The embodiment of the present invention exists as shown in Figure 7
1400,1800,2400, on 2700MHz frequency point, gain G T.GT.GT 8.6dBi, beam angle is stablized at 66.5 ° ± 2.5 °.
Be the standing wave of following three kinds of situations: situation 1 shown in Fig. 8: having angle-style gap to have parasitic element, (present invention is implemented
Example), situation 2 has angle-style gap without parasitic element, and situation 3 is without angle-style gap without parasitic element.Situation 1, situation 2 as shown in Figure 8
Comparative situation 3 nearby generates new resonance point in high frequency (2.8GHz) being provided with angle-style gap, has expanded high frequency bandwidth.Feelings
1 comparative situation 2 of condition, after being provided with parasitic element, 1400-2800MHz band standing internal wave is integrally less than 1.5.
Fig. 9 is shown, standing wave of the present invention and angle-style gap length change curve；When angle-style gap length is 44mm as shown in Figure 9,
New resonance point, when angle-style gap length increases to 48mm or is decreased to 40mm, high-frequency resonant are generated at high frequency (2.8GHz)
Point disappears.
Figure 10 is shown, standing wave of the present invention and parasitic element height change curve；Parasitic element height is as shown in Figure 10
When 22mm, 1400-2800MHz band standing internal wave is less than 1.5, and when parasitic element height is gradually reduced, standing wave runs down can not
Meet requirement of the standing wave less than 1.5.
Figure 11 is shown, standing wave of the present invention and parasitic element radius change curve；Parasitic element radius is as shown in Figure 11
16mm, when, standing wave fluctuation it is most stable, when parasitic element radius increases to 20mm or is decreased to 12mm, there is high frequency evil in standing wave
The phenomenon that change, low frequency improve or high frequency improves, low frequency deteriorates.
This frequency band, which enhances Bipolarization antenna for base station, has structure novel, and wide bandwidth, high isolation, high-gain, directional diagram are horizontal
Beam angle stability is high, is easily assembled the advantages of welding.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. a kind of frequency band enhances Bipolarization antenna for base station, including reflecting plate, support construction, radiating element and parasitic element, described
Radiating element is fixed on above reflecting plate by support construction, and the parasitic element is fixed on radiating element by insulated column
Side, it is characterised in that: the radiating element includes medium substrate and the first radiation arm on medium substrate, the second radiation
Arm, third radiation arm and the 4th radiation arm, first radiation arm, the second radiation arm, third radiation arm and the 4th radiation arm close
In radiating element center rotational symmetry；First radiation arm and third radiation arm constitute+45 ° of polarization oscillators, second spoke
It penetrates arm and the 4th radiation arm constitutes -45 ° of polarization oscillators；Four radiation arms are by metal patch and are located at metal patch apex angle
The metal column of inside first position is constituted, and the inside second position of the apex angle of the metal patch is also provided with the second position
Centered on the gap with symmetrical structure, which, which has, is parallel to the extended segment on the metal patch side, symmetrical two
Extended segment is crossed to form with towards the opening at radiating element center；The parasitic element includes circular metal plate and four metals
Arm, four metal arms are about circular metal plate rotational symmetry；Four metal arms are opposite with the position of four radiation arms
It answers.
2. a kind of frequency band according to claim 1 enhances Bipolarization antenna for base station, which is characterized in that the first position and
The second position is respectively positioned on the line between radiating element center and metal patch apex angle, and the first position is pasted to the metal
The distance of piece apex angle is less than the second position to the distance of the metal patch apex angle.
3. a kind of frequency band according to claim 1 or 2 enhances Bipolarization antenna for base station, which is characterized in that described parasitic single
First center and radiating element center are located on same axis, and the parasitic element is fixed on above radiating element by insulated column,
Distance is 0.15-0.25 λ；The circular metal plate diameter is 0.15-0.25 λ, and λ is corresponding for Antenna Operation centre frequency 2.1GHz
Vacuum wavelength.
4. a kind of frequency band according to claim 3 enhances Bipolarization antenna for base station, which is characterized in that the gap length is
0.25-0.55 λ, width are 0.001-0.1 λ.
5. a kind of frequency band according to claim 1 enhances Bipolarization antenna for base station, which is characterized in that the radiating element with
Reflecting plate distance is 0.2-0.4 λ.
6. a kind of frequency band according to claim 3 enhances Bipolarization antenna for base station, which is characterized in that adjacent two metal
Distance is gradually increased outward by radiating element center between patch, in the metal patch edge, increases range rate.
7. a kind of frequency band according to claim 1 enhances Bipolarization antenna for base station, which is characterized in that the support construction packet
Include the first balun coupling circuit plate, the second balun coupling circuit plate and medium bottom plate；The first balun coupling circuit plate and
Two balun coupling circuit plate square crossings are placed, and axis is aligned with radiating element center；The first balun coupling circuit plate
Including the first Γ shape metal patch, the first rectangular metal, third rectangular metal and first medium substrate, second balun
Coupling circuit plate include the 2nd Γ shape metal patch, the second rectangular metal, the 4th rectangular metal and second medium substrate, institute
With stating the first Γ shape metal patch and the first rectangular metal, it is printed on to third rectangular metal first medium substrate front and back table respectively
Face, the 2nd Γ shape metal patch and the second rectangular metal, be printed on second medium substrate respectively to the 4th rectangular metal
Front and rear surfaces, the first balun coupling circuit plate and the second balun coupling circuit plate are fixed on medium bottom plate, the medium
Bottom plate is fixed on reflecting plate；The first rectangular metal overground part, third rectangular metal overground part respectively with first spoke
Arm, the connection of third radiation arm are penetrated, the second rectangular metal overground part, the 4th rectangular metal overground part are respectively at second spoke
Penetrate arm, the connection of the 4th radiation arm, the first rectangular metal underground part, the second rectangular metal underground part, third rectangular metal
Lower part and the 4th rectangular metal underground part are connect with medium lower surface of base plate；The first Γ shape metal patch passes through to the first square
Shape metal, third rectangular metal ground couple feed, realize that+45 ° of polarization oscillators motivate；The 2nd Γ shape metal patch is logical
Cross to the second rectangular metal, the 4th rectangular metal ground couple feed, realize that -45 ° of polarization oscillators motivate.
8. a kind of frequency band according to claim 7 enhances Bipolarization antenna for base station, which is characterized in that the first Γ shape gold
Belong to patch and the 2nd Γ shape metal patch is in same rotation direction.
9. a kind of frequency band according to claim 1 enhances Bipolarization antenna for base station, which is characterized in that the metal arm is ten
Font metal arm, four cross metal arms are located at right above four radiation arms, the cross metal arm and radiation arm
Axis alignment.
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