WO2014115653A1 - Antenne, et antenne de secteur - Google Patents

Antenne, et antenne de secteur Download PDF

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Publication number
WO2014115653A1
WO2014115653A1 PCT/JP2014/050802 JP2014050802W WO2014115653A1 WO 2014115653 A1 WO2014115653 A1 WO 2014115653A1 JP 2014050802 W JP2014050802 W JP 2014050802W WO 2014115653 A1 WO2014115653 A1 WO 2014115653A1
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WO
WIPO (PCT)
Prior art keywords
antenna
pair
point
element portions
portions
Prior art date
Application number
PCT/JP2014/050802
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English (en)
Japanese (ja)
Inventor
章煥 李
琳 王
Original Assignee
日本電業工作株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 日本電業工作株式会社 filed Critical 日本電業工作株式会社
Priority to CN201480004178.1A priority Critical patent/CN104904066A/zh
Publication of WO2014115653A1 publication Critical patent/WO2014115653A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines

Definitions

  • the present invention relates to an antenna and a sector antenna.
  • a mobile communication base station antenna base station antenna
  • a plurality of sector antennas that radiate radio waves for each sector set corresponding to the direction in which radio waves are radiated are used in combination.
  • the sector antenna an array antenna in which antenna elements such as a dipole antenna are arranged in an array is used.
  • Patent Document 1 a pair of thin planar antenna elements are arranged line-symmetrically with respect to a straight line, and further, a pair of planar power feeding leg pieces are arranged close to each other with a minute gap as line-symmetrical with respect to the straight line.
  • a wideband antenna that is formed in a protruding shape from mutually adjacent portions of the antenna element, and each leg piece has an outwardly widened shape in which the width dimension gradually increases in the outer end direction.
  • Patent Document 2 discloses a laterally elongated substantially elliptical surface portion disposed on a vertical surface, and a downward widened power supply extending downward from one arc end of a horizontal major axis of the substantially elliptical surface portion.
  • Wide-band antenna formed by arranging four antenna elements having a plurality of legs in a 90-degree rotational symmetry with a vertical axis approaching the one arc end as a center, and having a cross shape in plan view An apparatus is described.
  • the antenna is required to have a wide frequency characteristic so that a single antenna can transmit and receive radio waves of a plurality of frequencies.
  • An object of the present invention is to provide an antenna or the like having a broadband frequency characteristic.
  • the antennas to which the present invention is applied are each made of a conductive material, and are arranged at predetermined positions at symmetrical positions with respect to the predetermined points.
  • a pair of element portions having curves in which the edges of the opposing portions are convex toward this point, and provided at a predetermined distance from the pair of element portions, facing the surfaces of the pair of element portions.
  • a reflector According to this configuration, it is possible to obtain a wider frequency characteristic and to reduce the number of components as compared with the case where the antenna includes a parasitic element.
  • each is made of a conductive material, and is arranged at a predetermined interval at a symmetrical position with respect to the above point, and the edge of the portion facing this point is directed toward this point.
  • Another pair of element units that have a convex curve and can transmit and receive a polarization orthogonal to the polarization transmitted and received by the pair of element units may be further provided. According to this configuration, a common antenna for polarization can be configured more compactly than in the case where this configuration is not provided.
  • it further includes a pair of leg portions that connect the respective element portions of the pair of element portions to the reflector, and the pair of element portions and the pair of leg portions are integrally formed of a conductive material.
  • the part can be characterized in that it is integrally formed of a conductive material. According to this configuration, it is possible to reduce the man-hours for manufacturing and assembling the polarization sharing antenna as compared with the case where the present configuration is not provided.
  • the sector antennas to which the present invention is applied are each made of a conductive material, and are arranged at predetermined positions at symmetrical positions with respect to predetermined points.
  • a pair of element parts having a curved line in which the edge of the part facing the point is convex toward the point, and facing the surface of the pair of element parts at a predetermined distance from the pair of element parts
  • An array antenna including a plurality of antennas each including a reflection plate is provided, and a radome that houses the array antenna. According to this configuration, it is possible to obtain a broadband frequency characteristic and to reduce the number of components compared to the case where this configuration is not provided.
  • each of the antennas is made of a conductive material, and is arranged at a predetermined interval at a symmetrical position with respect to the above-mentioned point, and the edge of the portion facing this point is this It may further include another pair of element units that have a curve that is convex toward the point and that can transmit and receive a polarization that is orthogonal to the polarization that the pair of element units transmit and receive. According to this configuration, it is possible to configure a sector antenna having a common polarization more compactly than in the case where this configuration is not provided.
  • an antenna having a broadband frequency characteristic can be provided.
  • FIG. 1 is a diagram illustrating an example of an overall configuration of a mobile communication base station antenna 1 to which the first exemplary embodiment is applied.
  • FIG. 1A is a perspective view of the base station antenna 1
  • FIG. 1B is a diagram illustrating an installation example of the base station antenna 1.
  • the base station antenna 1 includes a plurality of sector antennas 10-1 to 10-6 held in a steel tower 20, for example. Then, as shown in FIG. 1 (b), the base station antenna 1 causes radio waves to reach the cell 2.
  • the cell 2 is a range where radio waves transmitted by the base station antenna 1 reach and a range where the base station antenna 1 receives radio waves.
  • Each of the sector antennas 10-1 to 10-6 has a cylindrical shape, and the central axis of the cylinder is provided perpendicular to the ground.
  • the cell 2 includes a plurality of sectors 3-1 to 3-6 that are divided at an angle in a horizontal plane.
  • Each of the sectors 3-1 to 3-6 is provided corresponding to the six sector antennas 10-1 to 10-6 of the base station antenna 1. That is, in the sector antennas 10-1 to 10-6, the direction of the main lobe 11 in which the electric field of each output radio wave is large is directed to the corresponding sectors 3-1 to 3-6.
  • the base station antenna 1 shown as an example in FIG. 1 includes six sector antennas 10-1 to 10-6 and sectors 3-1 to 3-6 corresponding thereto.
  • the number of sector antennas 10 and sectors 3 may be a predetermined number other than six.
  • the sector 3 is configured by dividing the cell 2 into six equal parts (center angle 60 °).
  • the sector 3 may not be equally divided, and any one sector 3 may be the other.
  • the sector 3 may be wider or narrower than the sector 3.
  • Each sector antenna 10 transmits a transmission signal to a dipole antenna provided in the sector antenna 10 (see dipole antennas 110-1 to 110-6 in FIG. 2 to be described later. When not distinguished from each other, they are referred to as dipole antennas 110).
  • a transmission / reception cable 31 for transmitting a received signal.
  • the transmission / reception cable 31 is connected to a transmission / reception unit (not shown) for generating a transmission signal and receiving a reception signal provided in a base station (not shown).
  • the transmission / reception cable 31 is, for example, a coaxial cable.
  • the base station antenna 1 transmits radio waves, but the base station antenna 1 can receive radio waves due to the reversibility of the antenna.
  • the signal flow may be reversed with the transmission signal as the reception signal.
  • the sector antenna 10 may include a phase shifter for supplying a plurality of dipole antennas 110 included in the sector antenna 10 with different phases of transmission signals. By making the phases of the transmission signals supplied to the plurality of dipole antennas 110 different, the radiation angle of the radio waves (beams) can be tilted from the horizontal plane toward the ground so that the radio waves do not reach the outside of the cell 2.
  • FIG. 2 is a diagram illustrating an example of the configuration of the sector antenna 10 according to the first embodiment.
  • the sector antenna 10 is placed sideways, and is shown in a perspective view seen obliquely.
  • the sector antenna 10 includes a reflection plate 120 and an array antenna 100 including a plurality of (in this example, six) dipole antennas 110-1 to 110-6 arranged on the reflection plate 120, and the array antenna 100.
  • a radome 500 which is stored so as to be wrapped.
  • the radome 500 is indicated by a broken line so that the array antenna 100 provided inside the radome 500 can be seen.
  • the odd-numbered dipole antennas 110-1, 110-3, and 110-5 include a pair of ellipse-shaped element portions 111a and 112a whose major axis directions are shifted by 45 ° from the vertical direction, respectively. Then, it transmits and receives a polarized wave deviated by 45 ° from the vertical direction. Note that the element portions 111 a and 112 a are arranged at point-symmetric positions with respect to the point O.
  • the even-numbered dipole antennas 110-2, 110-4, and 110-6 include a pair of other ellipse elements 111b and 112b whose major axis directions are shifted by ⁇ 45 ° from the vertical direction, respectively. Then, it transmits / receives a polarized wave deviated by ⁇ 45 ° from the vertical direction.
  • the element portions 111b and 112b are also arranged at point symmetric positions with respect to the point O.
  • the dipole antenna 110-1 and the dipole antenna 110-2 have a point O where the element portions 111a and 112a of the dipole antenna 110-1 are arranged in point symmetry, and an element portion 111b and 112b of the dipole antenna 110-2.
  • the points O arranged symmetrically with respect to the point are combined so as to be in common to form a pair.
  • the dipole antenna 110-3 and the dipole antenna 110-4 are combined in the same manner with the dipole antenna 110-5 and the dipole antenna 110-6 to form a pair.
  • the sector antenna 10 becomes the polarization sharing which can transmit / receive the polarization
  • the element portion 111 and the element portions 112a and 112b are denoted as the element portion 112 when not distinguished from each other.
  • dipole antennas 110-1 to 110 to 6 operate independently. Therefore, hereinafter, one of the dipole antennas 110-1 to 110-6 will be taken out and described as the dipole antenna 110.
  • ⁇ 45 ° polarized waves are transmitted / received.
  • horizontal and vertical polarized waves can be transmitted / received.
  • the reflector 120 reflects the radio wave transmitted by the dipole antenna 110 and holds the dipole antenna 110.
  • three pairs each composed of two dipole antennas 110 are arranged on the reflector 120 with a distance Dp to form an array (array antenna 100).
  • the front reflecting portion 120a facing the element portions 111 and 112 of the dipole antenna 110 is flat.
  • Both end portions of the reflecting plate 120 in the direction intersecting the array direction of the dipole antenna 110 are side reflecting portions 120b bent toward the dipole antenna 110 side.
  • the bent side surface reflection part 120b sets the beam width of the array antenna 100.
  • the side reflector 120 b is bent toward the dipole antenna 110 side, but may be bent toward the opposite side to the dipole antenna 110 side.
  • FIG. 1 the side reflector 120 b is bent toward the dipole antenna 110 side, but may be bent toward the opposite side to the dipole antenna 110 side.
  • one side reflecting part 120 b is provided at each end of the reflecting plate 120, but a plurality of side reflecting parts 120 b may be provided. Since the side reflector 120b sets the beam width of the array antenna 100, the side reflector 120b may be set so as to obtain a predetermined beam width.
  • the reflector 120 is made of a conductor, such as aluminum or copper.
  • the reflector 120 is provided in common for the six dipole antennas 110-1 to 110-6, but is separated for each dipole antenna 110 or for each pair of two dipole antennas 110. You may think.
  • the dipole antenna 110 and the reflector 120 corresponding to the dipole antenna 110 are referred to as an antenna 130.
  • the two dipole antennas 110 that are paired the two dipole antennas 110 that are paired and the reflecting plate 120 corresponding to the two dipole antennas 110 are also referred to as antennas 130.
  • the radome 500 includes a cylinder 501, an upper lid 502 that covers an upper end portion of the cylinder 501, and a lower lid 503 that covers a lower end portion of the cylinder 501.
  • the radome 500 stores the array antenna 100 therein.
  • the lower lid 503 of the radome 500 is provided with a connector (not shown), and the transmission / reception cable 31 for transmitting the transmission signal and the reception signal is connected to the dipole antenna 110 of the array antenna 100. In FIG. 2, the connection between the transmission / reception cable 31 and the dipole antenna 110 is not shown.
  • the radome 500 is made of an insulating resin such as FRP (fiber reinforced plastics), for example.
  • the array antenna 100 of the sector antenna 10 shown in FIG. 2 includes six dipole antennas 110, but the number of dipole antennas 110 is not limited to six and may be a predetermined number.
  • the sector antenna 10 shown in FIG. 2 is configured by one array antenna 100 including six dipole antennas 110, but may be configured by arranging a plurality of array antennas 100.
  • the radome 500 that covers the array antenna 100 and the like is a cylinder 501 having an upper lid 502 and a lower lid 503. It may be.
  • FIG. 3 is a diagram for explaining the configuration of the antenna 130 in the first embodiment.
  • 3A is a plan view
  • FIG. 3B is a cross-sectional view taken along line IIIB-IIIB in FIG. 3A.
  • the antenna 130 includes a dipole antenna 110 and a reflection plate 120.
  • the dipole antenna 110 includes element portions 111 and 112, a pair of leg portions 113 and 114 extending from the element portions 111 and 112, and a base portion 115 to which the leg portions 113 and 114 are fixed. Note that the base 115 may not be provided.
  • the element portions 111 and 112 of the dipole antenna 110 are members made of a conductive material each surrounded by an elliptical edge having a short diameter L1 and a long diameter L2. .
  • the element unit 111 and the element unit 112 are arranged point-symmetrically at a point O and are opposed to each other with a gap D so that the respective major axes L2 are aligned.
  • the element portion 111 is provided with a circular opening on the point O side, and a cylindrical leg portion 113 is connected to the opening.
  • the element portion 112 is also provided with a circular opening on the point O side, and a cylindrical leg portion 114 is connected to the opening.
  • the element portion 112 does not need to be provided with an opening, and the leg portion 114 may have a cylindrical shape.
  • the leg portions 113 and 114 are connected to a base portion 115 having a circular surface shape.
  • the base 115 is provided with an opening facing the cylindrical leg 113. That is, a cylindrical hollow portion extends from the opening of the element portion 111 to the opening of the base portion 115.
  • the element portions 111 and 112, the leg portions 113 and 114, and the base portion 115 are integrally formed of a conductive material. Note that the element portions 111 and 112, the leg portions 113 and 114, and the base portion 115 may be individually or partly integrated and assembled by screws or the like.
  • the element parts 111 and 112, the leg parts 113 and 114, and the base part 115 are comprised, for example with metals, such as copper and aluminum, or the alloy containing them.
  • the pedestal 115 is fixed to the front reflecting part 120a of the reflecting plate 120 with screws (not shown) or the like.
  • the surfaces of the element portions 111 and 112 of the dipole antenna 110 are configured to be parallel to the front reflection portion 120a of the reflection plate 120. Note that the height H is from the surface of the reflecting plate 120 on the dipole antenna 110 side to the center of the element portions 111 and 112 in the thickness direction.
  • An insulator 117 having a conductor 116 at the center is embedded in a cylindrical hollow portion that extends from the opening of the element portion 111 to the opening of the base portion 115.
  • the insulator 117 may be embedded in the entire hollow portion or may be embedded in a part.
  • the end portion of the conductor 116 on the element portion 111 side is bent by 90 ° and connected to an end portion (arrow A portion) close to the point O of the element portion 112. Note that the connection is made by, for example, solder.
  • the end of the conductor 116 on the base 115 side is connected to the inner conductor of the transmission / reception cable 31 through an opening provided in the reflector 120. Further, the reflection plate 120 is connected to the outer conductor of the transmission / reception cable 31.
  • the conductor 116 may be a conducting wire having a circular cross section, but since it is difficult to bend at 90 °, the conductor 116 may be formed by cutting a metal plate into an L shape.
  • the conductor 116 is made of a metal such as copper or aluminum or an alloy containing them.
  • the insulator 117 is made of, for example, polytetrafluoroethylene having excellent high frequency characteristics. Note that it is preferable to cut down the end portion (the portion indicated by the arrow B) on the point O side of the element portion 112 so that the conductor 116 bent by 90 ° does not contact the element portion 112.
  • the short diameter L1 of the element portions 111 and 112 is 21 mm
  • the long diameter L2 is 30 mm
  • the distance D between the element portions 111 and 112 is 12 mm.
  • the height H from the center in the thickness direction of the element portions 111 and 112 to the reflection plate 120 is 38.5 mm. This height H is set to about 1 ⁇ 4 wavelength when the center frequency fc of the array antenna 100 is 2 GHz. Therefore, when viewed from the element portions 111 and 112, the element portion 111 and the element portion 112 are short-circuited in the base portion 115, but no current flows. That is, the dipole antenna 110 is a short type dipole antenna.
  • the leg portions 113 and 114 are cylindrical or columnar, but the outer shape may not be cylindrical or columnar, but may be prismatic.
  • the shape of the leg portions 113 and 114 may be any shape that can be easily formed when the element portions 111 and 112, the leg portions 113 and 114, and the base portion 115 are integrally formed by a method such as die casting. And the leg part 113 should just be provided with the cylindrical hollow part from the element part 111 to the base part 115.
  • each dipole antenna 110 when two dipole antennas 110 are paired to share polarization, the base 115 may be configured in common. By configuring as a single unit, the dipole antenna 110 can be produced in a lump and is excellent in mass productivity.
  • each dipole antenna 110 when two dipole antennas 110 are used as a pair, each dipole antenna 110 includes a pair of legs 113 and 114, so that the two pairs of legs 113 and 114 are integrally formed.
  • FIG. 4 is a diagram illustrating the configuration of the dipole antenna 110 that is paired with the dipole antenna 110 of FIG. 3 for polarization sharing in the first embodiment.
  • 4A is a plan view
  • FIG. 4B is a cross-sectional view taken along line IVB-IVB in FIG. 4A.
  • FIG. 4 when the dipole antenna 110 of FIG. 3 is used as the element portions 111a and 112a, the dipole antenna 110 as the element portions 111b and 112b is shown (see FIG. 2). Therefore, description of the same part is abbreviate
  • each conductor 116 of the two dipole antennas 110 cross
  • the element portion 112b and the conductor 116 are connected at a portion indicated by an arrow A ′.
  • the connection is made with, for example, solder.
  • the dipole antenna 110 may not include the pedestal 115.
  • the leg portions 113 and 114 may be lengthened by a length corresponding to the thickness of the base portion 115. And the leg parts 113 and 114 should just be fixed to the front reflection part 120a of the reflecting plate 120.
  • FIG. When the base 115 is provided, the dipole antenna 110 and the reflection plate 120 can be fixed by fixing the base 115 and the reflection plate 120 with screws or the like, so that the array antenna 100 can be easily assembled.
  • the surfaces of the element portions 111 and 112 are described as being parallel to the front reflection portion 120a of the reflection plate 120, but may not be parallel.
  • the side close to the point O of the element portions 111 and 112 may be closer to the front reflecting portion 120a of the reflecting plate 120 than the far side. Conversely, it may be far away. That is, the element unit 111 and the element unit 112 may be symmetric with respect to an axis OO ′ that connects the point O and the point O ′ that is obtained by projecting the point O perpendicularly to the front reflection unit 120a of the reflector 120. Further, the axis OO ′ may not be perpendicular to the front reflection part 120a of the reflection plate 120 and may be inclined.
  • FIG. 5 shows a model used to simulate the characteristics of the antenna 130.
  • Six dipole antennas 110-1 to 110-6 were used, and the odd number and even number were paired for polarization sharing. Then, a transmission signal for transmitting radio waves was supplied to the pair of dipole antenna 110-3 and dipole antenna 110-4. Transmission signals were not supplied to the dipole antennas 110-1 and 110-2 and the dipole antennas 110-5 and 110-6, and they were dummy.
  • FIG. 6 is a diagram showing the return loss (dB) characteristic of the antenna 130 in the first embodiment obtained by the simulation model shown in FIG.
  • the short diameter L1 of the element portions 111 and 112 is 21 mm
  • the long diameter L2 is 30 mm
  • the distance D between the element portions 111 and 112 is 12 mm.
  • the height H from the center in the thickness direction of the element portions 111 and 112 to the reflection plate 120 is 38.5 mm.
  • the lower limit frequency fL is 1.6 GHz
  • the upper limit frequency fH is 3 GHz.
  • the specific bandwidth is 61%.
  • the specific bandwidth is about 25%. Even if a passive element is added to the dipole antenna to increase the bandwidth, the specific bandwidth is about 40%. Therefore, the antenna 130 according to the first embodiment has a wider band than the antenna using the dipole antenna 110 having the rod-shaped element portions 111 and 112 to which parasitic elements are added. Further, the antenna 130 of the first embodiment has fewer components and is easy to manufacture as compared to an antenna using the dipole antenna 110 having a complicated configuration to which a parasitic element is added.
  • FIG. 7 is a diagram showing the beam width of the antenna 130 according to the first embodiment obtained by the simulation model shown in FIG. Here, the case where the frequency f is 2 GHz is shown. As shown in FIG. 7, the beam width is 65 °. As described above, the beam width can be set by the side reflector 120b. Therefore, the beam width can be adjusted by adjusting the width of the reflector 120 and the shape and number of the side reflectors 120b.
  • Table 1 shows the input impedance ( ⁇ ) of the antenna 130 when the minor axis L1 of the element portions 111 and 112 shown in FIG.
  • the impedance at which the specific bandwidth with the return loss of ⁇ 10 dB or less is the largest is defined as the input impedance of the antenna 130. That is, the impedance is set to match in the path from the feed line to the element portions 111 and 112 of the dipole antenna 110.
  • the major axis L2 is 30 mm
  • the distance D between the element portions 111 and 112 is 12 mm
  • the height H from the center in the thickness direction of the element portions 111 and 112 to the reflector 120 is 38.5 mm.
  • the input impedance of the antenna 130 decreases as the minor axis L1 increases.
  • the input impedance is 100 ⁇ .
  • the smaller the minor axis L1 the larger, for example, 175 ⁇ when the minor axis L1 is 15 mm. That is, in the first embodiment, the input impedance of the antenna 130 can be set by the minor axis L1 of the elliptical element portions 111 and 112.
  • the impedance cannot be changed even if the width of the rod is changed, unlike the antenna 130 of the first embodiment.
  • Table 2 shows the input impedance ( ⁇ ) of the antenna 130 when the height H from the center in the thickness direction of the element portions 111 and 112 shown in FIG. Also in this simulation, the impedance of the transmission / reception cable 31 that is a feed line is changed, and the impedance of the portion formed by the conductor 116 and the insulator 117 provided in the hollow portion of the leg 113 shown in FIG.
  • the impedance at which the specific bandwidth with the return loss of ⁇ 10 dB or less is the largest is defined as the input impedance of the antenna 130. That is, the impedance is set to match in the path from the feed line to the element portions 111 and 112 of the dipole antenna 110.
  • the minor axis L1 is 21 mm
  • the major axis L2 is 30 mm
  • the distance D between the element portions 111 and 112 is 10 mm.
  • the input impedance of the antenna 130 increases as the height H from the center in the thickness direction of the element portions 111 and 112 to the reflecting plate 120 decreases, for example, 150 ⁇ when the height H is 32.5 mm. It becomes. Conversely, the smaller the height H is, the larger it is. For example, when the height H is 42.5 mm, it becomes 75 ⁇ . That is, in the first embodiment, the input impedance of the antenna 130 can be set even when the height H from the center in the thickness direction of the element portions 111 and 112 to the reflector 120 is changed.
  • the input impedance of the antenna 130 can be set even when the major axis L2 of the element portions 111 and 112 and the distance D between the element portions 111 and 112 are changed.
  • the antenna 130 of the first embodiment has two resonance frequencies.
  • the resonance frequency on the low frequency side is in the vicinity of 1.8 GHz.
  • the resonance frequency on the high frequency side is in the vicinity of 2.6 GHz. From the data obtained by changing the shapes of the element portions 111 and 112, the resonance frequency on the low frequency side depends on the length of the outer edges of the element portions 111 and 112 of the dipole antenna 110, and the resonance frequency on the high frequency side is the dipole antenna. It turned out that it exists in the tendency depending on the short diameter L1 of 110 element parts 111 and 112.
  • a frequency range that is equal to or less than a predetermined return loss can be set. Further, if the outer edge length and the minor axis L1 of the element portions 111 and 112 are the same, the antenna 130 using the dipole antenna 110 in which the frequency range that is equal to or less than the return loss is set in the same manner, even if it is not elliptical. can do.
  • the shape of the element portions 111 and 112 of the dipole antenna 110 in the antenna 130 is elliptical.
  • the element portions 111 and 112 of the dipole antenna 110 in the antenna 130 have a semi-elliptical shape in which a pentagon is connected. Since the other configuration is the same as that of the first embodiment, the description of the same portion is omitted, and the configuration of the dipole antenna 110 which is a different portion will be described.
  • FIG. 8 is a plan view for explaining the configuration of the dipole antenna 110 according to the second embodiment.
  • the outer edges of the element unit 111 and the element unit 112 are elliptical in a portion close to the point O (the boundary is indicated by a broken line), and one vertex is a point O in a portion away from the point O. It has a pentagon shape that protrudes away from the direction. Even if the dipole antenna 110 has such a shape, the antenna 130 has a broadband characteristic.
  • FIG. 9 is a diagram illustrating the return loss (dB) characteristics of the antenna 130 according to the second embodiment. This characteristic was calculated
  • the lower limit frequency fL is 1.6 GHz
  • the upper limit frequency fH (not shown) is 3 GHz or more. It has a wider band than the antenna 130 in the first embodiment shown in FIG.
  • FIG. 10 is a plan view for explaining the configuration of the dipole antenna 110 according to the third embodiment.
  • the outer edges of the element unit 111 and the element unit 112 are elliptical in a portion close to the point O (the boundary is indicated by a broken line), and one vertex is a point O in a portion away from the point O. It has a triangular shape that protrudes away from the center. Even if the dipole antenna 110 has such a shape, the antenna 130 has a broadband characteristic.
  • the shapes of the element portions 111 and 112 of the dipole antenna 110 in the antenna 130 of the first embodiment are changed as in the second and third embodiments. . Since the other configuration is the same as that of the first embodiment, the description of the same portion is omitted, and the configuration of the dipole antenna 110 which is a different portion will be described.
  • FIG. 11 is a plan view illustrating the configuration of the dipole antenna 110 according to the fourth embodiment.
  • the outer edges of the element unit 111 and the element unit 112 are elliptical in a portion close to the point O (the boundary is indicated by a broken line) and away from the point O in a portion away from the point O. It has a quadrangular shape that pops out. Even if the dipole antenna 110 has such a shape, the antenna 130 has a broadband characteristic.
  • the element portion 111 and the element portion 112 of the dipole antenna 110 are made of a conductive material, and the outer edge thereof has a shape including a curve such as an ellipse.
  • the antenna 130 having a wide frequency range that is equal to or less than a predetermined return loss can be obtained.
  • a portion near the point O where the element portion 111 and the element portion 112 of the dipole antenna 110 are arranged point-symmetrically is a curved line such as an elliptical shape that is convex toward the point O, whereby the dipole antenna
  • the pair of dipole antennas 110 that transmit and receive polarized waves orthogonal to the polarization of the radio waves transmitted and received by 110 are paired with the point O in common, the two dipole antennas 110 paired together are They can be easily combined without overlapping each other.
  • a frequency range that is equal to or less than a predetermined return loss can be set.
  • 112 can be selected and used. Therefore, when two dipole antennas 110 are paired to share polarization, it is easy to set the shapes so as not to overlap each other.
  • the element portions 111 and 112, the leg portions 113 and 114, and the base portion 115 in the dipole antenna 110 are configured integrally or individually by a conductive material such as metal. It has been said. However, you may comprise the element parts 111 and 112 with the metal foil etc. which were affixed on the insulating board
  • SYMBOLS 1 Base station antenna, 2 ... Cell, 3-1, 3-1 to 3-6 ... Sector, 10, 10-1 to 10-6 ... Sector antenna, 11 ... Main lobe, 20 ... Steel tower, 31 ... Transmission / reception cable, 100 ... Array antenna, 110, 110-1 to 110-6 ... Dipole antenna, 111, 111a, 111b, 112, 112a, 112b ... Element part, 113, 114 ... Leg part, 115 ... Base part, 120 ... Reflector, 120a ... Front reflector, 120b ... Side reflector, 130 ... Antenna, 500 ... Radome

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

L'antenne de l'invention est équipée d'une antenne doublet (110) et d'une plaque de réflexion (120). Des parties élément (111, 112) de l'antenne doublet (110) sont chacune configurées par un matériau conducteur, sont disposées symétriquement par rapport à un point (O), et simultanément possèdent une ligne courbe convexe vers le point (O) et des caractéristiques de fréquence de large bande.
PCT/JP2014/050802 2013-01-24 2014-01-17 Antenne, et antenne de secteur WO2014115653A1 (fr)

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KR101703741B1 (ko) * 2015-09-11 2017-02-07 주식회사 케이엠더블유 다중편파 방사소자 및 이를 구비한 안테나
JP6730550B2 (ja) * 2016-06-01 2020-07-29 日本電業工作株式会社 移相器、分配／合成装置及びセクタアンテナ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010252175A (ja) * 2009-04-17 2010-11-04 Mitsubishi Cable Ind Ltd 広帯域アンテナ
JP2011244244A (ja) * 2010-05-19 2011-12-01 Denki Kogyo Co Ltd 偏波ダイバーシチアンテナ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010252175A (ja) * 2009-04-17 2010-11-04 Mitsubishi Cable Ind Ltd 広帯域アンテナ
JP2011244244A (ja) * 2010-05-19 2011-12-01 Denki Kogyo Co Ltd 偏波ダイバーシチアンテナ

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CN104904066A (zh) 2015-09-09

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