• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE1350119A1
    申请号:SE1350119
    申请日:2013-01-31
    公开日:2014-08-01
    发明作者:Stefan Jonsson；Dan Karlsson
    申请人:Cellmax Technologies Ab；
    IPC主号:
    专利说明:

    configuration (Fig. 1a). These two antennas can be used for two different frequency bands (eg PCS 1900 and UMTS 2100 or LTE 2600). Another configuration used is an integrated antenna. In this configuration, two double-band radiating elements 113 are used which consist of a combined low-band radiator and high-band radiator described in WO2006 / 058658-A1, together with a single-band low-band radiator 111 and high-band radiator 112 (Fig. 1b). - . _ v. u. _ _. v * ~ _ ~ _ \ * > \ * - \\ ~ \ ~ § \ \\ ~ ~ § .NW ~~ \\\ ' ~ ~ §Ç ç§ ~ -š \ .l .§.§.§.§. =. §X <$ ššxssàmšknxš; The inventors of the present invention have found disadvantages associated with prior art multi-band antenna arrangements as the high band antenna does not utilize the entire available vertical aperture of the reflector. As smartphones are used to a greater and greater extent, the focus for the development of cellular networks has shifted from providing calls to data traffic. Operators have an immediate need to provide more capacity for data traffic, often in combination with new cellular systems such as LTE.
    Cellular standards such as CDMA and LTE are designed in such a way that higher received power will provide a higher throughput of data traffic. One way to achieve higher received power is to increase the gain of the base station antenna, this can be achieved by increasing the antenna aperture.
    A problem with increasing the aperture of the high band antenna has been losses in a conventional supply network based on narrow flexible cables increasing with the number of radiators at high frequencies compared to at low frequencies and therefore some or all of the increased gain achieved by increasing the antenna aperture has been lost. in the supply network. Newer cellular standards such as the LTE standard include the use of MIMO, "Multiple Input Multiple Output" antennas for the purpose of increasing data throughput by using a plurality of antennas that receive low correlation signals. Therefore, it may be advantageous to add more antennas in a band antenna arrangement.
    A problem with using dual band dipoles as described in WO2006 / 058658-A1 is that since the high band dipole affects the performance of the low band dipoles, it is difficult to optimize the performance of both the low band and high band at the same time.
    If separate radiators are used for the lowband and highband in a multi-band antenna, radiators for different frequency bands must operate in close proximity to each other. They can then adversely affect each other's radiation patterns or connect unwanted signals between each other.
    The object of the present invention is to improve the performance of a multi-band antenna arrangement.
    The above-mentioned objects of the present invention are achieved by providing an antenna arrangement for mobile communication, which antenna arrangement comprises a plurality of radiators for at least two different frequency bands, which plurality of radiators are placed on a reflector, the plurality of radiators comprising a first group of radiators arranged to operate in a first frequency band of the at least two frequency bands, the plurality of radiators comprising a second group of radiators arranged to operate in a second frequency band of the at least two frequency bands, which first group of radiators forms a first antenna and which second group of radiators forms a second antenna, the beams being cross-polarized, the beams in the first group being cross-type and the beams in the second group being four-blade type.
    By antenna arrangement according to the present invention, the performance of a multi-band antenna arrangement can be improved.
    The reflector may be made of a conductive material, preferably of metal or a metal composition, but other electrically conductive materials may also be used. The beams are preferably dipoles but other beams such as patches can also be used. Radiators can have different polarizations such as horizontal, vertical or plus 45 degrees or minus 45 degrees, or any other polarization. Two polarizations can be combined in the same radiating element to form a double polarizing dipole. The radiating elements in each row and for each polarization can be fed from a connection via the feed network. In particular for higher frequencies such as 1800 MHz or 2600 MHz, losses in the supply network can be significant when the entire antenna aperture is used and it is advantageous to use supply networks with low losses e.g. as shown in WO 2005/101566-A1 but considering that low belts are often used for coverage, a low loss supply network is also advantageous for the low belt.
    The purpose of the distribution network is to distribute the signal from common connections to the beams. The phase and amplitude of the signals fed from the beams are defined in such a way that the desired radiation pattern is achieved in the vertical diagram. The pattern may have a slope in the vertical plane and may be optimized in terms of zero filling and lobe depression on the upper side in a manner well known to one skilled in the art. In the same way, variable phase shifters can be used in the supply network to provide adjustable inclination.
    When the entire aperture is used for a highband antenna, the vertical radiation width can become so small that it becomes impractical due to e.g. problems adjusting the vertical inclination of the antenna correctly. It may then be advantageous to optimize the supply network to further optimize the side lobes of the antenna to improve the coverage of the covered cell and to reduce signals transmitted in undesired directions and thus reduce interference in the cellular system. Such optimization of side lobe patterns will usually increase the radiation width at the expense of antenna gain but will improve the overall cellular performance as interference decreases.
    With new cellular standards such as LTE including MIMO, it is advantageous to provide antenna arrangements that include multiple antennas for the same frequency band. With e.g. two antenna columns with double polarizing radiators can be produced 4 times MIMO. MIMO requires that the signal received on each channel (corresponding to, for example, a polarization in an antenna) has a low correlation. Low correlation can be achieved e.g. by using orthogonal polarization or by separating the antennas or by a combination of both. For optimal decorrelation by antenna separation, a separation with several wavelengths is required and if two antennas with the same frequency arranged side by side inter are side by side, it will be optimal. A better solution in a multi-band antenna arrangement is to place an antenna for another frequency band between the two antennas with the same frequency used for MIMO.
    Possible radiators that can be used for multi-band antenna arrangements are dipoles.
    Today, almost only double-polarizing elements are used in cellular systems and usually in a plus / minus 45 degree configuration. Basic T-shaped dipoles have the advantage of providing excellent radiation efficiency but have a fairly poor bandwidth. Dipole bandwidth can be improved by providing a more advanced structure. One such structure for a double polarizing dipole is the four-leaf clover construction shown in Fig. 4 which also has an excellent bandwidth performance. This dipole gives an excellent result in a multi-band antenna arrangement when used for the high band antenna but if used for the low band antenna it will be very large. In addition, the distance between the dipole and the reflector will typically be in the order of a quarter of a wavelength, and when sold, large lowband dipoles will partially cover the highband dipoles and cause undesired coupling between the dipoles for different frequency bands. The inventors have found that for the low band antenna it is therefore advantageous to use a cross type dipole as shown in Fig. 5. It should be emphasized that the shape shown in Fig. 4 is not the only one which can be advantageous to use for the high band dipole but other configurations are possible such as providing a square frame described in WO2005 / 060049-A1 or having dipoles formed with square plates shown in WO 2008/017386-A1 or triangular plates. By providing radiators with large bandwidth that cover e.g. the frequency band 1700 to 2200 MHz, fl your antennas in the antenna arrangement can have the same dipole but work in different cellular systems at different frequency bands e.g.
    PCS 1900 and UMTS 2100 or the different antennas can be used for MIMO for a cellular system e.g. LTE.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the beams in the first group are low-band radiators and the beams in the second group are high-band radiators.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the beams in the first group are arranged in a first row and the beams in the second group are arranged in a second row.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the antenna arrangement comprises the reflector, e.g. an electrically conductive reflector, in that the reflector extends along a longitudinal axis and in that the first and second rows are parallel to the longitudinal axis.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the plurality of radiators comprise a third group of radiators which form a third antenna, in that the beams in the third group are arranged in a third row parallel to the first and second rows.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the beams in the third group are arranged to operate in a third frequency band which differs from the first and second frequency bands.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the beams in the third group are of the four-leaf type. Advantageously, the beams in the third group may be high band radiators.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the first group of radiators is located between the second and third group.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the beams in the first group have the same antenna aperture, e.g. the same antenna aperture length, as the beams in the second group. The beams in the first group may have the same antenna aperture, e.g. the same antenna aperture length, in the direction along the longitudinal axis of the reflector as the rays of the second group.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the third group or row of radiators has the same antenna aperture, e.g. the same antenna aperture length, as the first and second group or row radiators.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the beams in the first group may have the same vertical aperture as the beams in the second group when the reflector is mounted so that it extends in a vertical direction.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the ratio between at least two of the frequency bands is of the order of two or higher.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the antenna arrangement comprises the reflector, e.g. an electrically conductive reflector, in that the reflector has a longitudinal extent along a longitudinal axis and in that each of the groups of radiators utilizes the entire antenna aperture made available by the reflector in the direction of the longitudinal axis.
    According to an advantageous embodiment of the antenna arrangement according to the present invention, the antenna arrangement comprises an antenna supply network which is connected to the beams and in that the antenna supply network comprises a plurality of air-filled coaxial lines.
    According to a further advantageous embodiment of the antenna arrangement according to the present invention, the antenna arrangement is a multi-band antenna arrangement. According to another advantageous embodiment of the antenna arrangement according to the present invention, a first vertical column arranged substantially along the entire height of the same antenna.
    According to a further advantageous embodiment of the antenna arrangement according to the present invention, a first vertical column radiator for a frequency band is arranged substantially along the entire height of the antenna reflector and a second vertical column with radiators for a second frequency band is arranged substantially along the entire height of the same antenna reflector. with radiators for a second frequency band is arranged substantially along the entire height of the same antenna receiver.
    According to a further advantageous embodiment of the antenna arrangement according to the present invention, a first vertical column radiator for a frequency band is arranged substantially along the entire height of the antenna reflector and a second vertical column with radiators for a second frequency band is arranged substantially along the entire height of the same antenna reflector. with radiators for a third frequency band is arranged substantially along the entire height of the same antenna receiver.
    According to a further advantageous embodiment of the antenna arrangement according to the present invention, a first vertical column radiator for a frequency band is arranged substantially along the entire height of the antenna reflector, which radiators are cross-shaped, and a second vertical column with radiators for a second frequency band is arranged substantially along the entire height. for the same antenna reflector, which radiators are four-clover-shaped, and a third vertical column with radiators for a third frequency band is arranged substantially along the entire height of the same antenna reflector, which radiators are four-clover-shaped.
    The above-mentioned objects of the present invention are also achieved by providing a base station for mobile communication, the base station comprising at least one antenna arrangement according to any one of claims 1 to 16 and / or at least one antenna arrangement according to any of the embodiments of apparatus shown in this application. Positive technical effects of the base station according to the present invention and its embodiments correspond to the technical effects which have been mentioned in connection with the antenna arrangement according to the present invention and its embodiments.
    The above-mentioned features and embodiments of the antenna arrangement and the base station can be combined in various conceivable ways and provide further advantageous embodiments.
    Further advantageous embodiments of the device according to the present invention and further advantages of the present invention appear from the detailed description of embodiments.
    Sw ~ ~ \\ \ ~~ § * ~ : ~ w ~, - \ ~ «§ ~ ~ _ \ _ - * \\\\ - - ~ ~ _ \ «\\ ~ _ .mms i kt ~ & .. §. § O» xxxmg-w en- x xmxkxxxšieaš now; The present invention will now be described, by way of example, with more reference to embodiments with reference to the accompanying drawings, in which: Fig. 1a is a schematic side view of a prior art multi-band antenna having a lowband antenna and two superimposed highband antennas; Fig. 1b is a schematic view of an integrated multi-band antenna according to prior art with a low-band and a high-band antenna; Fig. 2 is a schematic view of an embodiment of the multi-band antenna with a low-band and a high-band antenna; Fig. 3 is a schematic view of an embodiment of the multi-band antenna with a low-band antenna in the middle and two high-band antennas on each side of the low-band antenna; Fig. 4 is a schematic side view of an embodiment of the multi-band antenna with a low-band antenna in the middle and two high-band antennas on each side of the low-band antenna; Fig. 5 is an embodiment of a four-leaf clover type dipole; and Fig. 6 is an embodiment of a cross-type dipole.
    Figures 2-4 schematically show aspects of embodiments of the antenna arrangement according to the present invention comprising a reflector 204 and radiators 202 and 203.
    In Fig. 2, a first column of low band radiators 203 is placed on a reflector 204.
    A second column of high band radiators 202 is located next to the first column.
    The highband beams 202 are smaller than the lowband beams 203 and the separation between the beams is smaller than for the lowband beams and thus more highband beams are needed to be able to cover the full length of the reflector. In Fig. 3, a first column of low band radiator 203 is located in the center of the reflector 204. A second column of high band radiator 202 is located at one side of the first column and a third column of high band radiator 202 is located on the other side of the first column. All three columns cover the full height of the reflector 204. Fig. 4 shows a schematic side view of an embodiment of the antenna arrangement according to the present invention. The low band dipole 210 of the low band radiator 203 is located approximately a quarter of a wavelength, relative to the high band, from the reflector 204. It can be seen that the low band dipole 210 will extend above the high band dipole 211 and it is therefore advantageous to use a low band dipole as far as possible the high-band dipole with the aim of reducing the influence of the low-band dipole on the radiation characteristics of the high-band. A screen 206 is placed between the high band beams and the low band beams for the purpose of reducing the coupling between the bands and for reducing the azimuth radiation width of the low band and high band lobes.
    Fig. 5 shows an embodiment of a high-band dipole radiator of the four-leaf type 230, e.g. in the form of a high-band dipole radiator of the four-leaf clover type 230. It consists of four substantially ethical dipole halves 213. Two opposite dipole halves 213 form a first dipole. The other two opposite dipole halves 213 form a second dipole having a polarization that is orthogonal to the first dipole. The dipole support 215 positions the dipoles at approximately a quarter wavelength from the reflector and is also used to form two baluns, one for each dipole.
    Fig. 6 shows an embodiment of a low band low voltage dipole 231. It consists of four substantially identical dipole halves 214. Two opposite dipole halves 214 form a first dipole. The other two opposite dipole halves 214 form a second dipole having a polarization that is orthogonal to the first dipole. The dipole support 216 positions the dipoles at approximately a quarter wavelength from the reflector and is also used to form two baluns, one for each dipole.
    Each radiator can be defined as a radiating element or a radiating antenna element. Each radiator may comprise an electrically conductive antenna element.
    The features of the various embodiments of the antenna arrangement shown above may be combined in various conceivable ways to provide further advantageous embodiments.
    The invention is not to be construed as limited by the illustrated embodiments, but may be modified and modified in many ways by those skilled in the art without departing from the scope of the appended claims.
    权利要求:
    Claims (1)
    [1]
    1. š \. . .. '§'. . ~~ _ \ 3 \. \ ._ _ .t <.§: .x .. = _ u.š s =.: »1. An antenna arrangement for mobile communication, the antenna arrangement comprising a plurality of radiators for at least two different frequency bands, the plurality of radiators being placed on a reflector, the plurality of radiators comprising a first group of radiators arranged to operate in a first frequency band of the at least two frequency bands, the plurality of radiators comprise a second group of radiators arranged to operate in a second frequency band of the at least two frequency bands, which first group of radiators forms a first antenna and which second group of radiators forms a second antenna, the beams (203) in the first group is of the cross type and wherein the rays (202) in the second group are of the four-leaf type. Antenna arrangement according to claim 1, characterized in that the beams (203) in the first group are low-band radiators and in that the beams (202) in the second group are high-band radiators. Antenna arrangement according to claim 1 or 2, characterized in that the beams in the first group are arranged in a first row and in that the beams in the second group are arranged in a second row. Antenna arrangement according to claim 3, characterized in that the antenna arrangement comprises the reflector, e.g. an electrically conductive reflector, in that the reflector extends along a longitudinal axis and in that the first and second rows are parallel to the longitudinal axis. Antenna arrangement according to claim 3 or 4, characterized in that the plurality of radiators comprise a third group of radiators forming a third antenna, in that the beams in the third group are arranged in a third row parallel to the first and second rows. Antenna arrangement according to claim 5, characterized in that the beams in the third group are arranged to operate in a third frequency band which differs from the first and second frequency bands. Antenna arrangement according to claim 5 or 6, characterized in that the beams (202) in the third group are of the four-leaf type. Antenna arrangement according to claim 7, characterized in that the beams (202) in the third group are highband radiators. Antenna arrangement according to one of Claims 5 to 8, characterized in that the first group of radiators is located between the second and third groups. Antenna arrangement according to one of Claims 1 to 9, characterized in that the beams in the first group have the same antenna aperture, e.g. the same antenna aperture length, as the beams in the second group. Antenna arrangement according to claim 10, characterized in that the beams in the first group have the same vertical aperture as the beams in the second group when the reflector is mounted so that it extends in a vertical direction. Antenna arrangement according to claim 10 or 11, characterized in that the third group or row of radiators has the same antenna aperture, e.g. the same antenna aperture length, as the first and second group or row radiators. Antenna arrangement according to one of Claims 1 to 12, characterized in that the ratio between at least two of the frequency bands is of the order of two or higher. Antenna arrangement according to one of Claims 1 to 13, characterized in that the antenna arrangement comprises the reflector, e.g. an electrically conductive reflector, in that the reflector has a longitudinal extent along a longitudinal axis and in that each of the groups of radiators utilizes the entire antenna aperture made available by the reflector in the direction of the longitudinal axis. Antenna arrangement according to one of Claims 1 to 14, characterized in that the antenna arrangement comprises an antenna supply network which is connected to the beams and in that the antenna supply network comprises a plurality of air-filled coaxial lines. Antenna arrangement according to one of Claims 1 to 15, characterized in that the antenna arrangement is a multi-band antenna arrangement. A base station for mobile communication, wherein the base station comprises at least one antenna arrangement according to any one of claims 1 to 16.
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    同族专利:
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    法律状态:
    2017-10-03| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1350119A|SE536854C2|2013-01-31|2013-01-31|Antenna arrangement and base station|SE1350119A| SE536854C2|2013-01-31|2013-01-31|Antenna arrangement and base station|
    PCT/SE2014/050047| WO2014120063A1|2013-01-31|2014-01-16|An antenna arrangement and a base station|
    AU2014213078A| AU2014213078A1|2013-01-31|2014-01-16|An antenna arrangement and a base station|
    CN201480006958.XA| CN104981939A|2013-01-31|2014-01-16|An antenna arrangement and a base station|
    EP14745710.5A| EP2951887A4|2013-01-31|2014-01-16|An antenna arrangement and a base station|
    US14/764,974| US20150372397A1|2013-01-31|2014-01-16|An antenna arrangement and a base station|
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