CN102544763B - Dual-polarization three-beam antenna for mobile communication base station - Google Patents
Dual-polarization three-beam antenna for mobile communication base station Download PDFInfo
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- CN102544763B CN102544763B CN201210080959.1A CN201210080959A CN102544763B CN 102544763 B CN102544763 B CN 102544763B CN 201210080959 A CN201210080959 A CN 201210080959A CN 102544763 B CN102544763 B CN 102544763B
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Abstract
The invention relates to a dual-polarization three-beam antenna for a mobile communication base station, which comprises a metal floor board, at least three lines of mutually parallel linear aerial arrays, at least three first power dividers, at least three second power dividers, a first Butler matrix feed network and a second Butler matrix feed network. Each line of linear aerial arrays is composed of at least two same aerial radiation units. The antenna structure of the dual-polarization three-beam antenna can form three dual-polarization beams with fixed directing in the horizontal direction and a single dual-polarization beam with the fixed directing in the vertical direction, and interference between the three beams in the horizontal direction is small. The three-beam antenna made by using the technical scheme of the dual-polarization three-beam antenna is good in anti-interference effect, stable in performance, large in signal capacity, easy to install and capable of effectively reducing cost, and well meets user requirements.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of dual polarization three beam antennas for mobile communication base station.
Background technology
Along with developing rapidly and the sharply increase of service of mobile communication of mobile communication technology, the overlay area of mobile communications network, in constantly expansion and perfect, correspondingly becomes more and more important as the antenna for base station of one of mobile communication system critical component along with the construction of mobile communications network.
Traditional antenna for base station is to communicate by produce a fixing broad beam in overlay area, owing to easily producing to disturb, message capacity is reduced like this.
Summary of the invention
In view of this, be necessary for the problems referred to above, dual polarization three beam antennas for mobile communication base station that a kind of anti-jamming effectiveness is good are provided.
For achieving the above object, the present invention by the following technical solutions:
A kind of dual polarization three beam antennas for mobile communication base station, it is characterized in that: comprise that metal floor, at least 3 is listed as the collinear array that is parallel to each other, at least 3 the first power splitters, at least 3 the second power splitters, the first butler matrix feeding network, the second butler matrix feeding network, the quantity of the first power splitter equates with the columns of collinear array, the quantity of the second power splitter equates with the columns of collinear array, collinear array is arranged on the upper surface of metal floor, and the first power splitter and the second power splitter are arranged on the lower surface of metal floor;
Every row collinear array is made up of at least 2 identical antenna radiation units, each antenna radiation unit is made up of the antenna elements of 1+45 degree antenna elements of polarization modes and 1-45 degree polarization mode, and+antenna elements of 45 degree polarization modes and the antenna element square crossings of-45 degree polarization modes combine;
Each input port of the first butler matrix feeding network is connected with signal input cable, and each output port of the first butler matrix feeding network is electrically connected with the synthetic port of power of each the first power splitter respectively; Each input port of the second butler matrix feeding network is connected with signal input cable, and each output port of the second butler matrix feeding network is electrically connected with the synthetic port of power of each the second power splitter respectively;
The quantity of the power division port of each the first power splitter with in every row collinear array+numbers of antenna element of 45 degree polarization modes equate, the quantity of the power division port of each the second power splitter equates with the number that-45 in every row collinear array spent the antenna element of polarization mode;
Each power division port of each the first power splitter respectively with same row collinear array in+45 degree polarization modes antenna elements be electrically connected; Each power division port of each the second power splitter respectively with same row collinear array in-45 degree polarization modes antenna elements be electrically connected.
The first power splitter is identical with the structure of the second power splitter, the distribution power magnitude of each power division port of each power splitter is identical, each adjacent power of each power splitter distributes the distribution power of port to have identical phase difference, makes antenna height pattern have an identical inclination angle.
Described inclination angle is top rade or angle of declination, the span of top rade be 0 degree to 40 degree, the span of angle of declination is that 0 degree is to 40 degree.
The distance of adjacent two row collinear arrays is 0.3 λ-1.5 λ, and in every row collinear array, the distance of adjacent antenna radiating element is 0.3 λ-1.5 λ.
Each collinear array is parallel to each other, and aligns mutually in the two ends of all collinear arrays.
Each collinear array is parallel to each other, and the two ends of all odd columns align mutually, aligns mutually in the two ends of all even columns.
The structure of the first butler matrix feeding network and the second butler matrix feeding network is identical, in the time that the columns of collinear array equals 3, each butler matrix feeding network is made up of 1 Ge San road butler matrix, isolation mutually between each input port of three road butler matrixs, each input port of three road butler matrixs is as the input port of butler matrix feeding network, and each output port of three road butler matrixs is as the output port of butler matrix feeding network.
The structure of the first butler matrix feeding network and the second butler matrix feeding network is identical, in the time that the columns of collinear array is greater than 3, each butler matrix feeding network is made up of 1 Ge San road butler matrix and 1 power divider network, isolation mutually between each input port of three road butler matrixs, each output port of three road butler matrixs connects the input port of power divider network, the quantity of the output port of power divider network equates with the columns of collinear array, each input port of three road butler matrixs is as the input port of butler matrix feeding network, each output port of power divider network is as the output port of butler matrix feeding network.
Three road butler matrixs are made up of the first blender, the second blender, the 3rd blender, the first phase shifter, the second phase shifter, the 3rd phase shifter;
Each blender comprises first input end mouth, the second input port, the first output port, the second output port, and each phase shifter comprises an input port and an output port;
Two input ports of the first blender, the second input port of the second blender are respectively as the input port of three road butler matrixs;
The first output port of the first blender is connected with the first input end mouth of the 3rd blender by the first phase shifter, the second output port of the first blender is connected with the first input end mouth of the second blender, and the first output port of the second blender is connected with the second input port of the 3rd blender;
The input port of the second phase shifter is connected with the first output port of the 3rd blender, and the input port of the 3rd phase shifter is connected with the second output port of the second blender;
The output port of the output port of the second phase shifter, the second output port of the 3rd blender, the 3rd phase shifter is respectively as the output port of three road butler matrixs.
Antenna structure of the present invention can form the dual polarization wave beam of 3 fixed directional in the horizontal direction, forms in vertical direction the dual polarization wave beam of single fixed directional, and the interference between 3 wave beams of horizontal direction is little.Three beam antennas that technical scheme according to the present invention is made, anti-jamming effectiveness is good, stable performance, signal volume is large, is easy to install, and can effectively reduce costs, and meets consumers' demand well.
Brief description of the drawings
Fig. 1 is the end view of general structure of the present invention.
Fig. 2 is the vertical view of general structure of the present invention.
Fig. 3 is the planar alignment schematic diagram of collinear array.
Fig. 4 is the schematic diagram of antenna radiation unit.
Fig. 5 is the schematic diagram of the first power splitter.
Fig. 6 is the schematic diagram of the second power splitter.
Fig. 7 and Fig. 8 are the schematic diagram of butler matrix feeding network.
The structural representation of Tu9Wei tri-road butler matrixs.
Embodiment
Refer to Fig. 1 and Fig. 2, the present invention comprises that for dual polarization three beam antennas of mobile communication base station at least 3 are listed as the collinear array 104(Fig. 1 being parallel to each other and classify example as with 5 to describe), metal floor 103, in at least 3 first power splitter 105(Fig. 2, be to describe taking 5 as example), in at least 3 second power splitter 106(Fig. 2, be to describe taking 5 as example), the first butler matrix feeding network 107, the second butler matrix feeding network 108, the quantity of the first power splitter 105 equates with the columns of collinear array 104, the quantity of the second power splitter 106 equates with the columns of collinear array 104, collinear array 104 is arranged on the upper surface of metal floor 103, the first power splitter 105 and the second power splitter 106 are arranged on the lower surface of metal floor 103.
Refer to Fig. 3, the distance of adjacent two row collinear arrays 104 is 0.3 λ-1.5 λ, and in the present embodiment, the distance of getting adjacent two row collinear arrays 104 is 0.5 λ.Every row collinear array 104 is made up of at least 2 (being to describe taking 6 as example in Fig. 3) identical antenna radiation units 203, and in every row, the distance of adjacent antenna radiating element 203 is 0.3 λ-1.5 λ, the distance of in the present embodiment, getting adjacent antenna radiating element 203 in every row collinear array 104 is 0.8 λ.Wherein, λ represents the wavelength of centre frequency correspondence in air of antenna working frequency range.
The arrangement mode of each collinear array 104 has:
1, each collinear array is parallel to each other, and aligns mutually in the two ends of all collinear arrays.
2, each collinear array is parallel to each other, and the two ends of all odd columns align mutually, aligns mutually in the two ends of all even columns.
Refer to Fig. 4, each antenna radiation unit 203 is made up of the antenna elements 201 of 202 and 1-45 of the antenna element degree polarization mode of 1+45 degree polarization modes, and+antenna element 201 square crossings of antenna elements 202 and-45 degree polarization modes of 45 degree polarization modes combine.
Refer to Fig. 5 and Fig. 6, each the first power splitter 105 has the synthetic port 402 of 1 power and several power division ports 403, the quantity of the power division port 403 of each the first power splitter 105 with in every row collinear array 104+45 numbers of spending the antenna element of polarization modes equate (what in Fig. 5, adopt is one point of six power splitter); Each the second power splitter 106 has the synthetic port 404 of 1 power and several power division ports 405, and the quantity of the power division port 404 of each the second power splitter 106 equates (what in Fig. 6, adopt is one point of six power splitter) with the number of the antenna element of the degree of-45 in every row collinear array 104 polarization mode.The distribution power magnitude of each power division port 403 of each the first power splitter 105 and each power division port 405 of the second power splitter 106 and phase place can be come to determine according to the actual requirements.In the present embodiment, the first power splitter 105 is identical with the structure of the second power splitter 106.Particularly, the distribution power magnitude of each power division port of each power splitter is identical, and each adjacent power of each power splitter distributes the distribution power of port to have identical phase difference, makes antenna height pattern have an identical inclination angle.Described inclination angle is top rade or angle of declination; The span of top rade be 0 degree to 40 degree, the span of angle of declination is that 0 degree is to 40 degree.In the present embodiment, taking off inclination angle 9 spends.
The structure of the first butler matrix feeding network 107 and the second butler matrix feeding network 108 is identical.In the time that the columns of collinear array equals 3, each butler matrix feeding network is made up of 1 Ge San road butler matrix 602, as shown in Figure 7.Isolation mutually between each input port of three road butler matrixs 602, each input port of three road butler matrixs 602 is as the input port of butler matrix feeding network, and each output port of three road butler matrixs 602 is as the output port of butler matrix feeding network.
In the time that the columns of collinear array is greater than 3, each butler matrix feeding network is made up of 602 and 1 power divider network 601 of 1 Ge San road butler matrix, as shown in Figure 8.Isolation mutually between the input port of three road butler matrixs 602, the output port of three road butler matrixs 602 connects the input port of power divider network 601, and the quantity of the output port of power divider network 601 is identical with the columns of collinear array 104.
The particular circuit configurations of Tu9Shi tri-road butler matrixs 602.Three road butler matrixs 602 are made up of the first blender 801, the second blender 802, the 3rd blender 803, the first phase shifter 804, the second phase shifter 805, the 3rd phase shifter 806.Each blender comprises first input end mouth, the second input port, the first output port, the second output port, and each phase shifter comprises an input port and an output port.
Two input ports of the first blender 801, the second input port of the second blender 802 are respectively as the input port of three road butler matrixs.
The first output port of the first blender 801 is connected with the first input end mouth of the 3rd blender 803 by the first phase shifter 804, the second output port of the first blender 801 is connected with the first input end mouth of the second blender 802, and the first output port of the second blender 802 is connected with the second input port of the 3rd blender 803;
The input port of the second phase shifter 805 is connected with the first output port of the 3rd blender 803, and the input port of the 3rd phase shifter 806 is connected with the second output port of the second blender 802.
The output port of the output port of the second phase shifter 805, the second output port of the 3rd blender 803, the 3rd phase shifter 806 is respectively as the output port of three road butler matrixs 602.
To sum up, overall electrical connection of the present invention is as follows:
The first butler matrix feeding network 107 is connected with signal input cable with each input port of the second butler matrix feeding network 108, and each output port of the first butler matrix feeding network 107 is electrically connected with the synthetic port 402 of power of each the first power splitter 105 respectively; Each output port of the second butler matrix feeding network 108 is electrically connected with the synthetic port 404 of power of each the second power splitter 106 respectively.Each power division port 403 of each the first power splitter 105 respectively with same row collinear array 104 in+45 degree polarization modes antenna elements 202 be electrically connected; Each power division port 405 of each the second power splitter 106 respectively with same row collinear array 104 in-45 degree polarization modes antenna elements 201 be electrically connected.
When each input port feed of butler matrix feeding network, the signal phase of output port is different linear change.Therefore, when each input port feed of butler matrix feeding network, the radiation beam of antenna horizontal direction is pointed to different, the wave beam that wherein input port 1 generation level 0 degree points to, the wave beam that input port 2 generation level-40 degree point to, the wave beam that input port 3 generation level+40 degree point to.
When 3 ports of the first butler matrix feeding network 107 are simultaneously when feed, antenna generation level is pointed to 0 degree, ± 40 degree, and 3+45 degree polarization wave beams of 9 degree that have a down dip in the vertical direction; When 3 ports of the second butler matrix feeding network 108 are simultaneously when feed, antenna generation level is pointed to 0 degree, ± 40 degree, and 3-45 degree polarization wave beams of 9 degree that have a down dip in the vertical direction.Therefore,, when 6 ports of these two butler matrix feeding networks are simultaneously when feed, antenna can produce that 3 horizontal directivity patterns point to that 0 degree, ± 40 degree and height pattern have that 9 degree have a down dip ± 45 spend dual-polarized 3 wave beams.
Antenna structure of the present invention can form the dual polarization wave beam of 3 fixed directional in the horizontal direction, forms in vertical direction the dual polarization wave beam of single fixed directional, and the interference between 3 wave beams of horizontal direction is little.Three beam antennas that technical scheme according to the present invention is made, stable performance, signal volume is large, is easy to install, and can effectively reduce costs, and meets consumers' demand well.
The above is the preferred embodiments of the present invention, and enforcement of the present invention and claimed scope are not limited to the scope of above-described embodiment.Within the spirit and principles in the present invention all, institute changes, is equal to replacement, improvement etc., within being all included in protection scope of the present invention.The sensing and the beamwidth that it is emphasized that especially wave beam of the present invention can adjust according to different demands; by the distance between radiating element number, the adjacent radiation unit of the distance between columns, the adjacent two row collinear arrays of adjustment this programme cathetus antenna array, every row collinear array, distribution power magnitude and the phase place of power splitter power division port, thereby regulate the change of beam position and width also within protection range of the present invention.In addition, by adjusting the change of quantity that the quantity of feed port changes horizontal beam also within protection range of the present invention.
Claims (8)
1. dual polarization three beam antennas for mobile communication base station, it is characterized in that: comprise that metal floor, at least 3 is listed as the collinear array that is parallel to each other, at least 3 the first power splitters, at least 3 the second power splitters, the first butler matrix feeding network, the second butler matrix feeding network, the quantity of the first power splitter equates with the columns of collinear array, the quantity of the second power splitter equates with the columns of collinear array, collinear array is arranged on the upper surface of metal floor, and the first power splitter and the second power splitter are arranged on the lower surface of metal floor;
Every row collinear array is made up of at least 2 identical antenna radiation units, each antenna radiation unit is made up of the antenna elements of 1+45 degree antenna elements of polarization modes and 1-45 degree polarization mode, and+antenna elements of 45 degree polarization modes and the antenna element square crossings of-45 degree polarization modes combine;
Each input port of the first butler matrix feeding network is connected with signal input cable, and each output port of the first butler matrix feeding network is electrically connected with the synthetic port of power of each the first power splitter respectively; Each input port of the second butler matrix feeding network is connected with signal input cable, and each output port of the second butler matrix feeding network is electrically connected with the synthetic port of power of each the second power splitter respectively;
The quantity of the power division port of each the first power splitter with in every row collinear array+numbers of antenna element of 45 degree polarization modes equate, the quantity of the power division port of each the second power splitter equates with the number that-45 in every row collinear array spent the antenna element of polarization mode;
Each power division port of each the first power splitter respectively with same row collinear array in+45 degree polarization modes antenna elements be electrically connected; Each power division port of each the second power splitter respectively with same row collinear array in-45 degree polarization modes antenna elements be electrically connected;
The structure of the first butler matrix feeding network and the second butler matrix feeding network is identical, and each butler matrix feeding network comprises 1 Ge San road butler matrix;
Three road butler matrixs are made up of the first blender, the second blender, the 3rd blender, the first phase shifter, the second phase shifter, the 3rd phase shifter;
Each blender comprises first input end mouth, the second input port, the first output port, the second output port, and each phase shifter comprises an input port and an output port;
Two input ports of the first blender, the second input port of the second blender are respectively as the input port of three road butler matrixs;
The first output port of the first blender is connected with the first input end mouth of the 3rd blender by the first phase shifter, the second output port of the first blender is connected with the first input end mouth of the second blender, and the first output port of the second blender is connected with the second input port of the 3rd blender;
The input port of the second phase shifter is connected with the first output port of the 3rd blender, and the input port of the 3rd phase shifter is connected with the second output port of the second blender;
The output port of the output port of the second phase shifter, the second output port of the 3rd blender, the 3rd phase shifter is respectively as the output port of three road butler matrixs.
2. dual polarization three beam antennas for mobile communication base station according to claim 1, it is characterized in that: the first power splitter is identical with the structure of the second power splitter, the distribution power magnitude of each power division port of each power splitter is identical, each adjacent power of each power splitter distributes the distribution power of port to have identical phase difference, makes antenna height pattern have an identical inclination angle.
3. dual polarization three beam antennas for mobile communication base station according to claim 2, is characterized in that: described inclination angle is top rade or angle of declination, the span of top rade be 0 degree to 40 degree, the span of angle of declination is that 0 degree is to 40 degree.
4. dual polarization three beam antennas for mobile communication base station according to claim 1, is characterized in that: the distance of adjacent two row collinear arrays is 0.3 λ-1.5 λ, in every row collinear array, the distance of adjacent antenna radiating element is 0.3 λ-1.5 λ.
5. dual polarization three beam antennas for mobile communication base station according to claim 1, it is characterized in that: each collinear array is parallel to each other, and align mutually in the two ends of all collinear arrays.
6. dual polarization three beam antennas for mobile communication base station according to claim 1, is characterized in that: each collinear array is parallel to each other, and the two ends of all odd columns align mutually, align mutually in the two ends of all even columns.
7. dual polarization three beam antennas for mobile communication base station according to claim 1, it is characterized in that: the structure of the first butler matrix feeding network and the second butler matrix feeding network is identical, in the time that the columns of collinear array equals 3, each butler matrix feeding network is made up of 1 Ge San road butler matrix, isolation mutually between each input port of three road butler matrixs, each input port of three road butler matrixs is as the input port of butler matrix feeding network, each output port of three road butler matrixs is as the output port of butler matrix feeding network.
8. dual polarization three beam antennas for mobile communication base station according to claim 1, it is characterized in that: the structure of the first butler matrix feeding network and the second butler matrix feeding network is identical, in the time that the columns of collinear array is greater than 3, each butler matrix feeding network is made up of 1 Ge San road butler matrix and 1 power divider network, isolation mutually between each input port of three road butler matrixs, each output port of three road butler matrixs connects the input port of power divider network, the quantity of the output port of power divider network equates with the columns of collinear array, each input port of three road butler matrixs is as the input port of butler matrix feeding network, each output port of power divider network is as the output port of butler matrix feeding network.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210080959.1A CN102544763B (en) | 2011-12-27 | 2012-03-26 | Dual-polarization three-beam antenna for mobile communication base station |
| PCT/CN2013/073201 WO2013143443A1 (en) | 2012-03-26 | 2013-03-26 | Dual-polarization three-beam antenna for mobile communication base station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110437829 | 2011-12-27 | ||
| CN201110437829.4 | 2011-12-27 | ||
| CN201210080959.1A CN102544763B (en) | 2011-12-27 | 2012-03-26 | Dual-polarization three-beam antenna for mobile communication base station |
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| CN102544763A CN102544763A (en) | 2012-07-04 |
| CN102544763B true CN102544763B (en) | 2014-06-04 |
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| CN2012201154060U Expired - Lifetime CN202474227U (en) | 2011-12-27 | 2012-03-26 | Dual-polarized tri-beam antenna for mobile communication base station |
| CN201210080959.1A Active CN102544763B (en) | 2011-12-27 | 2012-03-26 | Dual-polarization three-beam antenna for mobile communication base station |
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| CN2012201154060U Expired - Lifetime CN202474227U (en) | 2011-12-27 | 2012-03-26 | Dual-polarized tri-beam antenna for mobile communication base station |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202474227U (en) * | 2011-12-27 | 2012-10-03 | 广东博纬通信科技有限公司 | Dual-polarized tri-beam antenna for mobile communication base station |
| WO2013143443A1 (en) * | 2012-03-26 | 2013-10-03 | 广东博纬通信科技有限公司 | Dual-polarization three-beam antenna for mobile communication base station |
| US9553642B2 (en) * | 2014-07-28 | 2017-01-24 | Futurewei Technologies, Inc. | Apparatus and methods for cross-polarized tilt antennas |
| CN105742828B (en) * | 2016-03-31 | 2018-09-28 | 广东通宇通讯股份有限公司 | Three beam antenna of dual polarization and its feeding network device |
| CN105846113B (en) * | 2016-05-25 | 2019-01-22 | 广东博纬通信科技有限公司 | A kind of dual-band and dual-polarization narrow beam array antenna |
| CN106252901B (en) * | 2016-09-05 | 2023-06-20 | 广东博纬通信科技有限公司 | Broadband three-beam array antenna |
| CN106602265B (en) * | 2016-09-22 | 2023-08-22 | 京信通信技术(广州)有限公司 | Beam forming network and input structure, input and output method and three-beam antenna thereof |
| WO2019090807A1 (en) * | 2017-11-13 | 2019-05-16 | 广东博纬通信科技有限公司 | Two-beam array antenna and system |
| CN108092008B (en) * | 2017-11-13 | 2019-08-16 | 广东博纬通信科技有限公司 | Two beam array antennas of one kind and system |
| CN108963455B (en) * | 2018-07-16 | 2019-12-20 | 佛山市粤海信通讯有限公司 | Mobile communication dual polarization multi-beam antenna |
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| CN1868089A (en) * | 2003-07-18 | 2006-11-22 | Ems技术公司 | Vertical electrical downtilt antenna |
| WO2010108534A1 (en) * | 2009-03-23 | 2010-09-30 | Telefonaktiebolaget L M Ericsson (Publ) | Antenna arrangements |
| CN102064379A (en) * | 2010-07-29 | 2011-05-18 | 摩比天线技术（深圳）有限公司 | Electric tilt antenna and base station |
| CN201845860U (en) * | 2010-09-30 | 2011-05-25 | 寰波科技股份有限公司 | High-gain multi-polarization antenna array module |
| CN202474227U (en) * | 2011-12-27 | 2012-10-03 | 广东博纬通信科技有限公司 | Dual-polarized tri-beam antenna for mobile communication base station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4638317A (en) * | 1984-06-19 | 1987-01-20 | Westinghouse Electric Corp. | Orthogonal beam forming network |
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2012
- 2012-03-26 CN CN2012201154060U patent/CN202474227U/en not_active Expired - Lifetime
- 2012-03-26 CN CN201210080959.1A patent/CN102544763B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1868089A (en) * | 2003-07-18 | 2006-11-22 | Ems技术公司 | Vertical electrical downtilt antenna |
| WO2010108534A1 (en) * | 2009-03-23 | 2010-09-30 | Telefonaktiebolaget L M Ericsson (Publ) | Antenna arrangements |
| CN102064379A (en) * | 2010-07-29 | 2011-05-18 | 摩比天线技术（深圳）有限公司 | Electric tilt antenna and base station |
| CN201845860U (en) * | 2010-09-30 | 2011-05-25 | 寰波科技股份有限公司 | High-gain multi-polarization antenna array module |
| CN202474227U (en) * | 2011-12-27 | 2012-10-03 | 广东博纬通信科技有限公司 | Dual-polarized tri-beam antenna for mobile communication base station |
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| CN202474227U (en) | 2012-10-03 |
| CN102544763A (en) | 2012-07-04 |
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