CN103545621B - The multi-band array antenna of compact conformation - Google Patents
The multi-band array antenna of compact conformation Download PDFInfo
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Abstract
The present invention relates to a kind of multi-band array antenna of compact conformation, comprise metallic reflection plate, and be arranged on metallic reflection plate work in compared with low-frequency range low frequency radiating element and work in the high frequency radiating element of higher frequency band; Described low frequency radiating element and high frequency radiating element nesting arrangement on metallic reflection plate, and both orthographic projections do not overlap mutually.Described low frequency radiating element is connected power splitter feeding network by horizontal dipole with vertical dipole and forms.Described low frequency radiating element flexible structure, can the parameter such as flexible configuration spacing based on the actual application requirements.Adopt structure of the present invention, circuit network loss is little, the radiation characteristic of multi-band array antenna in ultra wide band range can be kept to stablize, and the 2G in compatible mobile communication, 3G and 4G? the all standards of LTE, not only can reduce base station number of antennas used, reduce cloth station cost, also can reduce operation maintenance expense.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of multi-band array antenna of compact conformation.
Background technology
In recent years, the extensive use of the intelligent mobile terminal being representative with smart mobile phone and panel computer, the data service in mobile communication is occurred growth at full speed.In order to meet the requirement to high speed data transfer in mobile communication, domestic and international Ge great operator is greatly developing based on the forth generation of TD-LTE and FDD-LTE two kinds of standards (4G) mobile communication technology.Nowadays, 2G, 3G and be about to universal 4GLTE network and deposit, the system of multiple use different frequency range exists simultaneously, needs to use the antenna for base station that can be operated in different frequency range.Use common narrow band antenna, a base station just needs to arrange many slave antennas, adds system complexity and property cost.In order to reduce networking cost, antenna broadband and miniaturizedly become one of current focus.
In order to the multiple communication standard of compatibility, dual-band dual-polarized antenna is used on a large scale.Traditional dual-band antenna many employings high frequency radiating element is with the structure of low frequency radiating element side by side (SidebySide) shoulder to shoulder, and publication number is a kind of broad-band antenna unit that the Australian patent application of AU2011201657A1 proposes is exactly this form.As shown in Figure 1, its oscillator is positioned at square cavity inside, is made up of ring-type tuning circuit and half-wave dipole or paster.Adopt the dual-band antenna cross section of the radiating element group battle array of this structure can be larger, be unfavorable for the miniaturization realizing antenna.
In order to reduce the front face area of antenna, high frequency radiating element and low frequency radiating element are that most of developer adopts by the coaxial arrangement of mode of inlaying.Publication number is a kind of multi-frequency array antenna that the Chinese patent application of CN101425626A proposes, and namely adopts in this way.But, be coupled to weaken between low-and high-frequency radiating element, its spacing can not be too little, causes the front face area of dual-band antenna still very large.
In addition, antenna of the prior art is operated in 790-960MHz and 1710-2690MHz frequency range mostly, is difficult to expand to 700MHz frequency range, is difficult to the application demand meeting 700MHzLTE.Moreover existing mosaic texture is all applicable to a row high frequency radiating element and a row low frequency radiating element, if need increase by row high frequency radiating element, must antenna width be increased, make it apply limited.Thus be necessary for above problem, develop and a kind ofly the working band of dual-band antenna can be widened 700MHz frequency range, the ultra wideband multi-band section antenna of compact conformation.
Summary of the invention
The object of the invention is to, overcome the defect existed in prior art, a kind of multi-band array antenna that can cover the compact conformation of 698-960MHz and 1710-2690MHz ultrabroad band is provided, with all frequency ranges of the current mobile communications network of compatibility.
For achieving the above object, the present invention is by the following technical solutions:
A multi-band array antenna for compact conformation, comprises metallic reflection plate, and be arranged on metallic reflection plate work in compared with low-frequency range low frequency radiating element and work in the high frequency radiating element of higher frequency band;
Described low frequency radiating element comprises mutually orthogonal horizontal dipole and vertical dipole, and described horizontal dipole is connected with power splitter feeding network with vertical dipole, produces ± 45 degree of polarization far field radiation pattern; Multiple low frequency radiating element arranges along the first reference line, forms a row low frequency array; Wherein, the vertical dipole of described multiple low frequency radiating element is all distributed on the first reference line;
Described high frequency radiating element comprises two mutually orthogonal oscillators; The center of multiple high frequency radiating element arranges along several reference lines respectively, forms ordered series of numbers HF array; Several reference lines described are all parallel to the first reference line, and do not overlap with the first reference line; Described high frequency radiating element and the first reference line not overlapping.
Preferably, described low frequency radiating element and the orthographic projection of high frequency radiating element on metallic reflection plate do not overlap mutually.
Preferably, the center of multiple high frequency radiating element, respectively along the arrangement of even number bar reference line, forms even column HF array; The wherein half of described even number bar reference line is positioned at the side of the first reference line, and second half is positioned at the opposite side of the first reference line, and the reference line being positioned at the first reference line both sides is symmetrical about the first reference line.
Preferably, in each row HF array, the spacing of adjacent high frequency radiating element has two kinds: the spacing of the multiple high frequency radiating element between adjacent two low frequency radiating element is equal, is the first spacing; The spacing laying respectively at the adjacent high frequency radiating element of the horizontal dipole both sides of same low frequency radiating element is the second spacing; Described second spacing is more than or equal to the first spacing.
Preferably, in low frequency radiating element, horizontal dipole comprises two radiation arms be symmetrically distributed on same straight line and the match circuit be connected between two radiation arms; Vertical dipole also comprises two radiation arms be symmetrically distributed on same straight line and the match circuit be connected between two radiation arms; Two radiation arms of horizontal dipole and two radiation arms of vertical dipole orthogonal, and physically not connect mutually; The mutually orthogonal placement of match circuit of horizontal dipole and vertical dipole, and vertical with metallic reflection plate; The radiation arm of horizontal dipole and vertical dipole is all parallel to metallic reflection plate.
Preferably, in same low frequency radiating element, the radiation arm of horizontal dipole is identical with the height of the radiation arm distance metallic reflection plate of vertical dipole, and the symmetrical centre of horizontal dipole and vertical dipole overlaps.
Preferably, the both sides of described low frequency radiating element are also provided with two parasitic half-wave dipole unit, described two half-wave dipole unit and vertical dipole arranged in parallel, and be arranged at the both sides of horizontal dipole bearing of trend respectively, carry out feed by being coupled of the radiation arm with horizontal dipole.
Preferably, described low frequency radiating element works in 698 ~ 960MHz band limits, and described high frequency radiating element works in 1710 ~ 2690MHz band limits.
Preferably, often in row HF array, the high frequency radiating element between adjacent two low frequency radiating element has more than 2.
Preferably, row or multiple row HF array are subordinated to same radio frequency system; Or the multiple high frequency radiating element in a row HF array are subordinated to multiple separate radio frequency system.
Preferably, in same row low frequency array, the feed direction of the vertical dipole of neighboring low radiating element is contrary, and the feed direction of the horizontal dipole of neighboring low radiating element is identical.
Preferably, in same row low frequency array, the feed direction of the vertical dipole of neighboring low radiating element is identical, and the feed direction of the horizontal dipole of neighboring low radiating element is contrary.
Preferably, described power splitter feeding network is made up of 2 road power splitters; The input port of described 2 road power splitters is connected with external signal, and the first delivery outlet is connected with the horizontal dipole of a low frequency radiating element, and the second delivery outlet is connected on the vertical dipole of the low frequency radiating element adjacent with this low frequency radiating element.
Preferably, the bearing of trend of two oscillators of high frequency radiating element and the bearing of trend of the horizontal dipole of low frequency radiating element are 45 degree of angles.
The multi-band array antenna of a kind of compact conformation provided by the invention, the mutually nested arrangement on metallic reflection plate of low frequency radiating element and high frequency radiating element, both do not overlap mutually in orthographic projection on metallic reflection plate, at utmost reduce the electrical Interference between low-and high-frequency signal; Its compact conformation and arrangement mode is flexible, multiple separate radio frequency system and the covering of low frequency realization to multiple different frequency range can be utilized, and then the covering effectively realized on the whole 698-960MHz and 1710-2690MHz ultrabroad band, with all frequency ranges of the current mobile communications network of compatibility.
Adopt structure of the present invention, circuit network loss is little, the radiation characteristic of multi-band array antenna in ultra wide band range can be kept to stablize, and the 2G in compatible mobile communication, the all standards of 3G and 4GLTE, not only can reduce base station number of antennas used, reduce cloth station cost, also can reduce operation maintenance expense.
Accompanying drawing explanation
Fig. 1 is a kind of broad-band antenna unit of the prior art.
The partial structurtes schematic diagram of a kind of 3 frequency range array antennas that Fig. 2 provides for the embodiment of the present invention one.
Fig. 3 is the structural representation of the power splitter feeding network in the embodiment of the present invention one.
The overall structure schematic diagram of a kind of 3 frequency range array antennas that Fig. 4 provides for the embodiment of the present invention one.
The overall structure schematic diagram of a kind of 5 frequency range array antennas that Fig. 5 provides for the embodiment of the present invention two.
The overall structure schematic diagram of a kind of 4 band antennas containing TD intelligent system that Fig. 6 provides for the embodiment of the present invention three.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical scheme of the present invention is described in detail.
Embodiment one
As shown in Figures 2 to 4,3 frequency range array antennas of a kind of compact conformation that the embodiment of the present invention provides, comprise metallic reflection plate, and be arranged on metallic reflection plate work in compared with low-frequency range low frequency radiating element 1 and work in the high frequency radiating element 2 of higher frequency band.Preferably, described low frequency radiating element 1 works in 698 ~ 960MHz band limits, and described high frequency radiating element 2 works in 1710 ~ 2690MHz band limits.
Described low frequency radiating element 1 comprises mutually orthogonal horizontal dipole 101 and vertical dipole 102, and described horizontal dipole 101 is connected with power splitter feeding network with vertical dipole 102, produces ± 45 degree of polarization far field radiation pattern.Multiple low frequency radiating element 1 equidistantly arranges along the first reference line, forms a row low frequency array; Wherein, the vertical dipole 102 of described multiple low frequency radiating element 1 is all distributed on the first reference line.It should be noted that, described horizontal dipole 101 and vertical dipole 102 are only the distinctiveness names carried out in conjunction with the present embodiment direction shown in the drawings, and can not represent in the three dimensions of reality, oscillator is level or vertical.
Described high frequency radiating element 2 comprises two mutually orthogonal oscillators, and the bearing of trend of the bearing of trend of two oscillators of high frequency radiating element 2 and the horizontal dipole 101 of low frequency radiating element 1 is 45 degree of angles; The center of multiple high frequency radiating element 2, respectively along the second reference line and the arrangement of the 3rd reference line, forms two row HF arrays.Wherein, described second reference line and the 3rd reference line are parallel to the first reference line, but three does not overlap mutually.In the embodiment of the present invention, described second reference line and the 3rd reference line about the first reference line symmetry, and lay respectively at the first reference line both sides.All high frequency radiating element 2 and the first reference line all not overlapping.
In each row HF array, the spacing of adjacent high frequency radiating element 2 has two kinds: the spacing of the multiple high frequency radiating element 2 between adjacent two low frequency radiating element 1 is equal, is the first spacing d1; The spacing laying respectively at the adjacent high frequency radiating element 2 of horizontal dipole 101 both sides of same low frequency radiating element 1 is the second spacing d2.Described second spacing d2, slightly larger than the first spacing d1, makes the distance between low frequency radiating element 1 and high frequency radiating element 2 pull open as far as possible.
Shown in composition graphs 2, in the embodiment of the present invention, be often distributed with 4 high frequency radiating element 2 between adjacent two low frequency radiating element 1; Namely, often in row HF array, the high frequency radiating element 2 between adjacent two low frequency radiating element 1 has 2.Spacing between these 2 high frequency radiating element 2 is the first spacing d1, and the spacing between two, the horizontal dipole 101 both sides high frequency radiating element 2 of same low frequency radiating element 1 is the second spacing d2.The space D of neighboring low radiating element 1 and the pass between the first spacing d1 and the second spacing d2 are: D=d1+d2.Under such layout, low frequency radiating element 1 and the orthographic projection of high frequency radiating element 2 on metallic reflection plate do not overlap mutually, and the distance between low frequency radiating element 1 and high frequency radiating element 2 keeps maximum, significantly reduces electrical Interference between the two.
In low frequency radiating element 1, horizontal dipole 101 comprises two radiation arms be symmetrically distributed on same straight line and the match circuit be connected between two radiation arms; Vertical dipole 102 also comprises two radiation arms be symmetrically distributed on same straight line and the match circuit be connected between two radiation arms.Two radiation arms of horizontal dipole 101 and two radiation arms of vertical dipole 102 orthogonal, and physically not connect mutually; The match circuit of horizontal dipole 101 and the mutually orthogonal placement of match circuit of vertical dipole 102, and vertical with metallic reflection plate respectively.The radiation arm of horizontal dipole 101 and vertical dipole 102 is all parallel to metallic reflection plate.
Radiation due to low frequency radiating element 1 is synthesized in far field by the radiation arm of mutual disjunct horizontal dipole 101 and vertical dipole 102, therefore vertical dipole 102 can answer instructions for use to place flexibly.In the embodiment of the present invention, the radiation arm of horizontal dipole 101 is identical with the height of the radiation arm distance metallic reflection plate of vertical dipole 102, and the symmetrical centre of horizontal dipole 101 and vertical dipole 102 overlaps, namely two radiation arms of horizontal dipole 101 and two radiation arm across of vertical dipole 102 are arranged.
Preferably, in the embodiment of the present invention, the length of described horizontal dipole 101 is greater than the half wavelength (180mm) that low frequency radiating element 1 covers band limits centre frequency, and the length of vertical dipole 102 is slightly less than the half wavelength that low frequency radiating element 1 covers band limits centre frequency.
As improvement, the both sides of described low frequency radiating element 1 are also provided with two parasitic half-wave dipole unit 103, described two half-wave dipole unit 103 are arranged in parallel with vertical dipole 102, and be arranged at the both sides of horizontal dipole 101 bearing of trend respectively, feed is carried out by being coupled of the radiation arm with horizontal dipole 101, to regulate the perpendicular polarisation components of far-field radiation, and improve beam converges degree.
Described power splitter feeding network can be outside also can be integrated in inner antenna, and in the embodiment of the present invention, described power splitter feeding network is integrated in inner antenna.As shown in Figure 3, described power splitter feeding network is made up of 2 road power splitters, and described 2 road power splitters are the network of one-in-and-two-out, are operated in 698 ~ 960MHz frequency range.Its delivery outlet has two, comprises the first delivery outlet 202 and the second delivery outlet 203.First delivery outlet 202 is connected with the horizontal dipole 101 of one of them low frequency radiating element 1 by 50 Omega cable, and the second delivery outlet 203 is connected on the vertical dipole 102 of the low frequency radiating element 1 adjacent with this low frequency radiating element 1 by 50 Omega cable.
Especially, owing to have employed 2 road power splitters in embodiments of the present invention as feeding network, for realizing described ± 45 polarization characteristics, the horizontal dipole 101 of described low frequency radiating element 1 and vertical dipole 102 need be arranged according to certain feed direction.Particularly, in same row low frequency array, the feed direction of the vertical dipole 102 of neighboring low radiating element 1 is contrary, and the feed direction of the horizontal dipole 101 of neighboring low radiating element 1 is identical.As shown in Figure 2 and Figure 4, symbol "+" and " ﹣ " is used to illustrate the feed direction of oscillator in figure.
Except above-mentioned method for arranging, the embodiment of the present invention can also adopt another kind of method for arranging.Particularly, in same row low frequency array, the feed direction of the vertical dipole 102 of neighboring low radiating element 1 is identical, and the feed direction of the horizontal dipole 101 of neighboring low radiating element 1 is contrary.
Generally speaking, the vertical dipole 102 feed direction of neighboring low radiating element 1 is contrary and horizontal dipole 101 feed direction is identical, or the vertical dipole 102 feed direction of neighboring low radiating element 1 is identical and horizontal dipole 101 feed direction is contrary.
In embodiments of the present invention, each row HF array is subordinated to an independently radio frequency system respectively.As shown in Figure 4, the high frequency radiating element 2 be on the second reference line and the 3rd reference line is subordinated to different radio frequency systems respectively.In other words, there are in the embodiment of the present invention two separate radio frequency systems, be respectively the part of two rectangle circles choosings in Fig. 4.Described two radio frequency systems can work in different frequency range, also can be operated in similar frequency bands, and jointly cover 1710 ~ 2690MHz frequency range, and meanwhile, the low frequency radiating element 1 be on the first reference line covers 698 ~ 960MHz frequency range; Therefore, accommodate 3 systems in the embodiment of the present invention, namely constitute the 3 frequency range array antennas that 1 low frequency system and 2 radio frequency systems coexist.
Embodiment two
As shown in Figure 5, the embodiment of the present invention changes on the basis of embodiment one, provides a kind of 5 frequency range array antennas.Particularly, the multiple high frequency radiating element 2 in each the row HF array in the embodiment of the present invention are subordinated to two separate radio frequency systems respectively.In other words, there are in the embodiment of the present invention four separate radio frequency systems altogether, be respectively the part of four rectangle circles choosings in Fig. 5, add another one low frequency system, constitute the 5 frequency range array antennas that 1 low frequency system and 4 radio frequency systems coexist.
Other features in the embodiment of the present invention are identical with embodiment one, therefore do not repeat them here.
Embodiment three
As shown in Figure 6, a kind of 4 band antennas containing TD intelligent system are embodiments provided.Wherein, 4 row HF arrays of figure center choosing are for being operated in 1880 ~ 2690MHz frequency range, and cover the TD intelligent system of TD-SCDMA and TD-LTE standard working frequency range, namely 4 row HF arrays are subordinated to same radio frequency system jointly.The two row HF arrays being positioned at TD intelligent system both sides are subordinated to two independently radio frequency systems respectively, are operated in 1710-2690MHz frequency range; And be in a row low frequency array at whole array antenna center, be subordinated to the low frequency system being operated in 698-960MHz frequency range.
Other features in the embodiment of the present invention are identical with embodiment one, therefore do not repeat them here.
It is pointed out that, in above three embodiments provided, the high frequency radiating element in each system and the number of low frequency radiating element are that technical solution of the present invention one in actual applications is specifically selected.According to Practical Project demand, increase or reduce the number of high frequency radiating element and low frequency radiating element, still can realize 3 described frequency ranges, 4 frequency ranges or 5 band antenna arrays.Simultaneously, in above three embodiments, by reducing or increase the quantity of wherein row or multiple row HF array medium-high frequency system, and then to realize the two-band of other array formats, 3 frequency ranges, 4 frequency ranges, 5 frequency ranges or other multi-band array antenna be all fairly simple and easy thing, those skilled in the art has the ability to expand according to the structural flexibility of the present invention the occasion of its application.
It is emphasized that; in above three embodiments; often in row HF array; the quantity of the high frequency radiating element between adjacent two low frequency radiating element is preferably 2; the high frequency radiating element of other quantity, such as 3 or 4 the even high frequency radiating element of 5 and even greater number, can realize covering different High-frequency and low-frequency frequency ranges; owing to not departing from design of the present invention, also within scope.
It is emphasized that in above three embodiments especially, often in row HF array, the high frequency radiating element number between adjacent two low frequency radiating element is fixing, and namely low frequency radiating element is equidistantly arrangement.But in practical engineering application, each low frequency radiating element also can be unequal-interval arrangement, and in this case, the number of the high frequency radiating element between adjacent two low frequency radiating element is then unfixed.Such as; 2 high frequency radiating element are had between first pair of neighboring low radiating element; 3 high frequency radiating element are had between second pair of neighboring low radiating element; the spacing of this low frequency radiating element changes staggered situation; also the optimization of low-and high-frequency coverage can be realized; owing to not departing from design of the present invention, also within protection scope of the present invention.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (12)
1. a multi-band array antenna for compact conformation, is characterized in that, comprises metallic reflection plate, and be arranged on metallic reflection plate work in compared with low-frequency range low frequency radiating element and work in the high frequency radiating element of higher frequency band;
Described low frequency radiating element comprises mutually orthogonal horizontal dipole and vertical dipole, and described horizontal dipole is connected with power splitter feeding network with vertical dipole, produces ± 45 degree of polarization far field radiation pattern; Multiple low frequency radiating element arranges along the first reference line, forms a row low frequency array; Wherein, the vertical dipole of described multiple low frequency radiating element is all distributed on the first reference line;
Described high frequency radiating element comprises two mutually orthogonal oscillators; The center of multiple high frequency radiating element arranges along several reference lines respectively, forms ordered series of numbers HF array; Several reference lines described are all parallel to the first reference line, and do not overlap with the first reference line; Described high frequency radiating element and the first reference line not overlapping;
The vertical dipole feed direction of described adjacent low frequency radiating element is contrary and horizontal dipole feed direction is identical, or the vertical dipole feed direction of adjacent low frequency radiating element is identical and horizontal dipole feed direction is contrary.
2. the multi-band array antenna of compact conformation according to claim 1, is characterized in that, described low frequency radiating element and the orthographic projection of high frequency radiating element on metallic reflection plate do not overlap mutually.
3. the multi-band array antenna of compact conformation according to claim 1, is characterized in that, the center of multiple high frequency radiating element, respectively along the arrangement of even number bar reference line, forms even column HF array; The wherein half of described even number bar reference line is positioned at the side of the first reference line, and second half is positioned at the opposite side of the first reference line, and the reference line being positioned at the first reference line both sides is symmetrical about the first reference line.
4. the multi-band array antenna of compact conformation according to claim 1, it is characterized in that, in each row HF array, the spacing of adjacent high frequency radiating element has two kinds: the spacing of the multiple high frequency radiating element between adjacent two low frequency radiating element is equal, is the first spacing; The spacing laying respectively at the adjacent high frequency radiating element of the horizontal dipole both sides of same low frequency radiating element is the second spacing; Described second spacing is more than or equal to the first spacing.
5. the multi-band array antenna of compact conformation according to claim 1, is characterized in that, in low frequency radiating element, horizontal dipole comprises two radiation arms be symmetrically distributed on same straight line and the match circuit be connected between two radiation arms; Vertical dipole also comprises two radiation arms be symmetrically distributed on same straight line and the match circuit be connected between two radiation arms; Two radiation arms of horizontal dipole and two radiation arms of vertical dipole orthogonal, and physically not connect mutually; The mutually orthogonal placement of match circuit of horizontal dipole and vertical dipole, and vertical with metallic reflection plate; The radiation arm of horizontal dipole and vertical dipole is all parallel to metallic reflection plate.
6. the multi-band array antenna of compact conformation according to claim 5, it is characterized in that, in same low frequency radiating element, the radiation arm of horizontal dipole is identical with the height of the radiation arm distance metallic reflection plate of vertical dipole, and the symmetrical centre of horizontal dipole and vertical dipole overlaps.
7. the multi-band array antenna of compact conformation according to claim 5, it is characterized in that, the both sides of described low frequency radiating element are also provided with two parasitic half-wave dipole unit, described two half-wave dipole unit and vertical dipole arranged in parallel, and be arranged at the both sides of horizontal dipole bearing of trend respectively, carry out feed by being coupled of the radiation arm with horizontal dipole.
8. the multi-band array antenna of compact conformation according to claim 1, is characterized in that, described low frequency radiating element works in 698 ~ 960MHz band limits, and described high frequency radiating element works in 1710 ~ 2690MHz band limits.
9. the multi-band array antenna of compact conformation according to claim 1, is characterized in that, often in row HF array, the high frequency radiating element between adjacent two low frequency radiating element has more than 2.
10. the multi-band array antenna of compact conformation according to claim 1, is characterized in that, row or multiple row HF array are subordinated to same radio frequency system; Or the multiple high frequency radiating element in a row HF array are subordinated to multiple separate radio frequency system.
11. multi-band array antenna according to claim 1, is characterized in that, described power splitter feeding network is made up of 2 road power splitters; First delivery outlet of described 2 road power splitters is connected with the horizontal dipole of a low frequency radiating element, and the second delivery outlet is connected on the vertical dipole of the low frequency radiating element adjacent with this low frequency radiating element.
The multi-band array antenna of 12. compact conformations according to claim 1, is characterized in that, the bearing of trend of two oscillators of high frequency radiating element and the bearing of trend of the horizontal dipole of low frequency radiating element are 45 degree of angles.
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| CN102800996A (en) * | 2012-08-03 | 2012-11-28 | 武汉虹信通信技术有限责任公司 | MIMO (Multiple Input Multiple Output) array antenna of multi-polarization manner |
| CN203521628U (en) * | 2013-10-25 | 2014-04-02 | 广东博纬通信科技有限公司 | Multi-frequency-band array antenna with compact structure |
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| CN103545621A (en) | 2014-01-29 |
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