JP6344559B2 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device.

  2. Description of the Related Art Conventionally, an antenna device is known that includes a transmission line having a triplate structure in which a central conductor is sandwiched between a pair of plate conductors and a plurality of antenna elements that can transmit a high-frequency signal distributed by the transmission line. (See Patent Document 1).

  The antenna device described in Patent Document 1 includes a plate-like first outer conductor, a plate-like second outer conductor arranged at a predetermined interval from the first outer conductor, and a first outer conductor and a second outer conductor. And a plurality of (eight) antenna elements. The central conductor branches sequentially from the input side and is divided into eight terminals on the output side, and an antenna element is connected to each terminal. When a high frequency signal is supplied from the input side, radio waves corresponding to the high frequency signal are radiated from the plurality of antenna elements.

  In this way, by configuring the high-frequency signal distribution line with a triplate line, for example, compared to the case where a coaxial cable is used, the dielectric loss can be reduced, and the line configuration and assembly work can be simplified. it can.

JP 2014-110557 A (FIG. 5)

  In recent years, for example, base station antennas for mobile phones are required to support a plurality of frequency bands, which complicates the configuration of distribution lines. If the distribution line of the antenna device having a complicated configuration is configured by the triplate line in which the center conductor is sandwiched between the pair of outer conductors as described above, the area of the outer conductor increases, and consequently the antenna device There is a risk of increasing the size.

  Therefore, the present inventors considered to configure the triplate line in a plurality of layers. However, if the triplate lines are formed in a plurality of layers and the center conductors of the respective triplate lines are connected by the connection member, the transmission loss of the high-frequency signal at the connection portion between the center conductors including the connection member increases. There was a case.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an antenna device capable of suppressing transmission loss of a high-frequency signal at a connection portion between central conductors in a triplate line. And

  In order to solve the above problems, the present invention includes a transmission line through which a high-frequency signal propagates, and a plurality of antenna elements connected to the transmission line, and the transmission line is electrically grounded. Thru | or 3rd plate-shaped conductor, the 1st center conductor arrange | positioned between the said 1st plate-shaped conductor and said 2nd plate-shaped conductor, and said 2nd plate-shaped conductor and said 3rd A second central conductor disposed between the plate-shaped conductor and an insertion hole formed in the second plate-shaped conductor to electrically connect the first central conductor and the second central conductor. There is provided an antenna device including a connection member that is electrically connected and a ground conductor that is disposed in the vicinity of the connection member and is electrically grounded.

  With the antenna device according to the present invention, it is possible to suppress transmission loss of high-frequency signals at the connection portion between the central conductors in the triplate line.

(A)-(d) is a schematic block diagram which shows the structural example of a 1st transmission part thru | or a 4th transmission part. It is an external appearance perspective view which shows the external appearance of a frequency sharing antenna apparatus. It is a block diagram which shows the inside of the radome of a frequency sharing antenna apparatus. It is a general view which shows the some antenna element arrange | positioned on the 3rd ground board. It is a fragmentary perspective view which shows the some antenna element arrange | positioned on the 3rd ground board. It is a perspective view which shows a part of 1st center conductor. It is a perspective view which shows a part of 2nd center conductor. (A) And (b) is explanatory drawing for demonstrating the fixation structure of the 1st thru | or 3rd ground plates 41-43, and the support structure of a 1st thru | or 2nd board | substrate. It is the schematic which shows the connection structure of a 1st center conductor and a 2nd center conductor. FIG. 10 is a sectional view taken along line AA in FIG. 9. It is the graph which showed the relationship between the space | interval of a connection pin and a metal spacer, and transmission loss. It is a perspective view which shows the structural example of a phase shifter.

[Embodiment]
Hereinafter, embodiments of a frequency sharing antenna device as one aspect of the antenna device of the present invention will be described with reference to the drawings. This frequency sharing antenna apparatus is used as a base station antenna for a mobile phone. In the following description, the case where the frequency sharing antenna apparatus according to the present embodiment is used for transmission of a high frequency signal will be described, but this frequency sharing antenna apparatus can also be used for reception.

(Functional configuration of frequency sharing antenna device)
FIGS. 1A to 1D are schematic diagrams illustrating a functional configuration of the frequency sharing antenna apparatus according to the present embodiment. This frequency sharing antenna apparatus can transmit high-frequency signals of 1.5 to 2 GHz band horizontal polarization and vertical polarization, and 700 to 800 MHz band horizontal polarization and vertical polarization. Hereinafter, the 1.5 to 2 GHz band is the first frequency band, and the 700 to 800 MHz band is the second frequency band.

  FIG. 1A is a schematic configuration diagram illustrating a configuration example of the first transmission unit 1A capable of transmitting the horizontal polarization of the first frequency band. The first transmission unit 1A distributes a signal input to a terminal unit 10A to which a core wire of a coaxial cable (not shown) is connected to a plurality (14 in the present embodiment) of first horizontal polarization antenna elements 15A. It is configured as follows.

  Specifically, the first transmission unit 1A includes a first distribution line 11A that distributes the signal input to the terminal unit 10A, and a second distribution line 12A that further distributes the signal distributed by the first distribution line 11A. A third distribution line 13A for further distributing the signal distributed by the second distribution line 12A, and a fourth distribution line 14A for further distributing the signal distributed by the third distribution line 13A. Is connected to the first horizontally polarized antenna element 15A.

  A plurality of phase shifters 20 are provided between the first distribution line 11A and the second distribution line 12A and between the second distribution line 12A and the third distribution line 13A, respectively. By changing the phase of the signal by the phase shifter 20, it is possible to adjust the directivity of radio waves radiated from the plurality of first horizontally polarized antenna elements 15A.

  Furthermore, the second distribution line 12A or the third distribution line 13A and the fourth distribution line 14A are connected by a connection pin 30 as a connection member described later.

  FIG.1 (b) is a schematic block diagram which shows the structural example of the 2nd transmission part 1B which can transmit the vertically polarized wave of a 1st frequency band. The second transmission unit 1B is configured in the same manner as the first transmission unit 1A. That is, the second transmission unit 1B distributes the signal input to the terminal unit 10B to which the core wire of the unillustrated coaxial cable is connected to a plurality (14 in the present embodiment) of the first vertically polarized antenna elements 15B. Is configured to do.

  Specifically, the second transmitter 1B includes a first distribution line 11B that distributes the signal input to the terminal unit 10B, and a second distribution line 12B that further distributes the signal distributed by the first distribution line 11B. The third distribution line 13B further distributes the signal distributed by the second distribution line 12B, and the fourth distribution line 14B further distributes the signal distributed by the third distribution line 13B. Are connected to the first vertically polarized antenna element 15B.

  Phase shifters 20 are provided between the first distribution line 11B and the second distribution line 12B and between the second distribution line 12B and the third distribution line 13B, respectively. The second distribution line 12B or the third distribution line 13B and the fourth distribution line 14B are connected by a connection pin 30.

  FIG.1 (c) is a schematic block diagram which shows the structural example of 3 C of 1st transmission parts which can transmit the horizontal polarization of a 2nd frequency band. The third transmission unit 1C distributes a signal input to a terminal unit 10C to which a core wire of a coaxial cable (not shown) is connected to a plurality (10 in the present embodiment) of second horizontally polarized antenna elements 15C. It is configured as follows.

  Specifically, the third transmission unit 1C includes a first distribution line 11C that distributes the signal input to the terminal unit 10C, and a second distribution line 12C that further distributes the signal distributed by the first distribution line 11C. , A third distribution line 13C for further distributing the signal distributed by the second distribution line 12C, and a fourth distribution line 14C for further distributing the signal distributed by the third distribution line 13C. Is connected to the second horizontally polarized antenna element 15C.

  Phase shifters 20 are provided between the first distribution line 11C and the second distribution line 12C and between the second distribution line 12C and the third distribution line 13C, respectively. Further, the second distribution line 12C or the third distribution line 13C and the fourth distribution line 14C are connected by a connection pin 30.

  FIG.1 (d) is a schematic block diagram which shows the structural example of 4th transmission part 1D which can transmit the vertically polarized wave of a 2nd frequency band. The fourth transmission unit 1D is configured in the same manner as the third transmission unit 1C. That is, the fourth transmission unit 1D distributes the signal input to the terminal unit 10D to which the core wire of the unillustrated coaxial cable is connected to a plurality of (in this embodiment, 10) second vertically polarized antenna elements 15D. Is configured to do.

  Specifically, the third transmission unit 1D includes a first distribution line 11D that distributes the signal input to the terminal unit 10D, and a second distribution line 12D that further distributes the signal distributed by the first distribution line 11D. A third distribution line 13D for further distributing the signal distributed by the second distribution line 12D, and a fourth distribution line 14D for further distributing the signal distributed by the third distribution line 13D. Is connected to the second vertically polarized antenna element 15D.

  Phase shifters 20 are provided between the first distribution line 11D and the second distribution line 12D and between the second distribution line 12D and the third distribution line 13D, respectively. The second distribution line 12D or the third distribution line 13D and the fourth distribution line 14D are connected by a connection pin 30.

  Hereinafter, the first horizontally polarized antenna element 15A, the first vertically polarized antenna element 15B, the second horizontally polarized antenna element 15C, and the second vertically polarized antenna element 15D are collectively referred to as the antenna element 15.

(Configuration of frequency sharing antenna device)
FIG. 2 is an external perspective view showing the external appearance of the frequency sharing antenna device 1. FIG. 3 is a configuration diagram showing the inside of the radome 10 of the frequency sharing antenna apparatus 1.

  The frequency sharing antenna device 1 includes a transmission line 100 through which a high-frequency signal propagates, a plurality of antenna elements 15 capable of transmitting a high-frequency signal distributed by the transmission line 100, and a dielectric plate 20 (described later) of the phase shifter 20. A moving mechanism 6 for moving and a radome 10 made of an insulating resin such as FRP (fiber reinforced plastics) are provided.

  The radome 10 has a cylindrical shape whose both ends are closed by an antenna cap (not shown), and is attached to the antenna tower or the like by a pair of mounting brackets 10a so that the longitudinal direction thereof is the vertical direction. The transmission line 100, the plurality of antenna elements 15, and the moving mechanism 6 are disposed in the radome 10.

  The transmission line 100 has a triplate structure in which a center conductor is sandwiched between a plurality of pairs of plate-like conductors. In the present embodiment, the transmission line 100 includes first to third ground plates 41 to 43 as a plurality of pairs of electrically grounded plate conductors, and includes the first to third ground plates 41 to 43. Among these, the first center conductor 51 is disposed between the first ground plate 41 and the second ground plate 42 that form a pair, and the second central plate 51 is interposed between the second ground plate 42 and the third ground plate 43. Two central conductors 52 are arranged.

  The first to third ground plates 41 to 43 are arranged in parallel to each other, and the second ground plate 42 is located between the first ground plate 41 and the third ground plate 43. The first to third ground plates 41 to 43 have a long plate shape having a longitudinal direction in the central axis direction of the radome 10. In FIG. 3, illustration of members such as spacers (described later) disposed between the first to third ground plates 41 to 43 and the first and second center conductors 51 and 52 is omitted. The length of the radome 10 in the central axis direction is, for example, 1 to 2.7 m.

  Fixing brackets 10 b for fixing the first ground plate 41 to the radome 10 are fixed to both ends of the first ground plate 41 in the longitudinal direction. The fixing bracket 10b sandwiches the radome 10 with the mounting bracket 10a, and is fastened to the radome 10 with bolts 10c.

  4 and 5 show the plurality of antenna elements 15 arranged on the third ground plate 43, FIG. 4 is an overall view, and FIG. 5 is a partial perspective view. In addition, the 3rd ground board 43 is installed so that the drawing upper direction of FIG.

  The plurality of antenna elements 15 are printed dipole antennas composed of a printed circuit board in which a wiring pattern (not shown) that functions as a radiating element is formed on a plate-like dielectric. Among the plurality of antenna elements 15, the first horizontally polarized antenna element 15A and the first vertically polarized antenna element 15B are arranged so as to cross in a cross shape. The second horizontally polarized antenna element 15C is arranged so that its substrate surface is in the horizontal direction. The second vertically polarized antenna element 15D is composed of a pair of printed circuit boards facing in the horizontal direction.

  The plurality of antenna elements 15 are fixed vertically to the third ground plate 43 by L-shaped mounting brackets 433 fixed to the third ground plate 43 by bolts 431 and nuts 432.

  The plurality of antenna elements 15 are provided with convex portions (not shown) that pass through the openings formed in the third ground plate 43, and a wiring pattern that functions as a radiating element is provided through the convex portions as the second wiring pattern. It is connected to the center conductor 52.

  FIG. 6 is a perspective view showing a part of the first center conductor 51. The first central conductor 51 is formed of a metal foil such as copper provided as a wiring pattern on the surface of a flat first substrate 510 made of a dielectric. First distribution lines 11A, 11B, 11C, and 11D, second distribution lines 12A, 12B, 12C, and 12D, and third distribution lines 13A, 13B, and 13C of the first to fourth transmission units 1A to 1D (see FIG. 1). , 13D are constituted by a first central conductor 51.

  FIG. 7 is a perspective view showing a part of the second center conductor 52. Similarly to the first center conductor 51, the second center conductor 52 is also formed of a metal foil such as copper provided as a wiring pattern on the surface of the flat plate-like second substrate 520 made of a dielectric. The fourth distribution lines 14 </ b> A, 14 </ b> B, 14 </ b> C, 14 </ b> D of the first to fourth transmission units 1 </ b> A to 1 </ b> D are configured by the second center conductor 52. The first substrate 510 and the second substrate 520 are made of an electrically insulating resin such as glass epoxy and have a thickness of 0.8 mm, for example.

  Note that the wiring pattern as the first central conductor 51 may be provided on both surfaces of the first substrate 510, or may be provided on only one surface. Similarly, the wiring pattern as the second central conductor 52 may be provided on both surfaces of the second substrate 520, or may be provided on only one surface.

(Support structure for first substrate and second substrate)
FIGS. 8A and 8B are explanatory diagrams for explaining the fixing structure of the first to third ground plates 41 to 43 and the support structure of the first to second substrates 510 and 520 in the transmission line 100. FIG. It is. 8A shows a state before the transmission line 100 is assembled, and FIG. 8B shows a state after the transmission line 100 is assembled.

  Metal spacers 50 made of a conductor are disposed between the first ground plate 41 and the second ground plate 42 and between the second ground plate 42 and the third ground plate 43, respectively. . The metal spacer 50 disposed between the first ground plate 41 and the second ground plate 42 is inserted through an insertion hole 510 a formed in the first substrate 510. The metal spacer 50 disposed between the second ground plate 42 and the third ground plate 43 passes through an insertion hole 520 a formed in the second substrate 520.

  The metal spacer 50 has conductivity, and is made of, for example, brass plated with copper or tin. Further, the metal spacer 50 has a shaft portion 501 and a male screw portion 502 integrally, and a screw hole 500 is formed in the shaft portion 501. 8A and 8B, the screw hole 500 is indicated by a broken line. In the present embodiment, the shaft portion 501 of the metal spacer 50 has a hexagonal column shape, but the shaft portion 501 may have a columnar shape.

  Between the first ground plate 41 and the second ground plate 42 and between the second ground plate 42 and the third ground plate 43, shaft portions 501 of the metal spacer 50 are respectively interposed. A space corresponding to the length of the shaft portion 501 is formed. The length of the shaft portion 501 is, for example, 5.0 mm. The first to third ground plates 41 to 43 are electrically connected to each other by a metal spacer 50.

  A nut 54 is screwed into the male thread portion 502 of the metal spacer 50 disposed between the first ground plate 41 and the second ground plate 42. The screw hole 500 of the metal spacer 50 disposed between the first ground plate 41 and the second ground plate 42 is disposed between the second ground plate 42 and the third ground plate 43. The male thread portion 502 of the metal spacer 50 is screwed. In addition, the male screw portion 551 of the bolt 55 is screwed into the screw hole 500 of the metal spacer 50 disposed between the second ground plate 42 and the third ground plate 43.

  The first to third ground plates 41 to 43 are formed with insertion holes 41a, 42a, and 43a through which the male threaded portion 502 of the metal spacer 50 or the male threaded portion 551 of the bolt 55 are inserted.

  As described above, the transmission line 100 has the two metal spacers 50, the one nut 54, and the one bolt 55 fixed to each other, whereby the first to third ground plates 41 to 43 are each separated by a predetermined distance. Are arranged in parallel to each other. A fixing structure including two metal spacers 50, one nut 54, and one bolt 55 is provided at a plurality of locations of the transmission line 100, and includes the first to third ground plates 41 to 43 and the first and first. The distance between the two substrates 510 and 520 is kept constant.

  The first substrate 510 is supported by a resin spacer 56 between the first ground plate 41 and the second ground plate 42. The second substrate 520 is supported by a resin spacer 56 between the second ground plate 42 and the third ground plate 43. The resin spacers 56 that support the first substrate 510 are fixed to both surfaces of the first substrate 510 by, for example, adhesion. Similarly, the resin spacer 56 that supports the second substrate 520 is fixed to both surfaces of the second substrate 520 by, for example, adhesion. The thickness of each resin spacer 56 is 2.1 mm, for example.

(Connection structure between the first central conductor and the second central conductor)
FIG. 9 is a schematic diagram showing a connection structure between the first center conductor 51 and the second center conductor 52. 10 is a cross-sectional view taken along line AA in FIG.

  The central conductors (the first central conductor 51 and the second central conductor 52) arranged with the second ground plate 42 interposed therebetween are formed on the second ground plate 42 in the connection portion 3 shown in FIG. They are electrically connected by connection pins 30 as connection members inserted through the connection pin insertion holes 42b.

  The connection pin 30 is a shaft-shaped member made of a highly conductive metal such as copper or brass. In the present embodiment, the connection pin 30 has a cylindrical shape, but is not limited thereto, and may be, for example, a rectangular column shape or a hexagonal column shape. Both ends of the connection pin 30 are inserted into an insertion hole 510b formed in the first substrate 510 and an insertion hole 520b formed in the second substrate 520, respectively, and the first central conductor 51 and the second center are connected. Soldered to the conductor 52. Further, the connection pin 30 is arranged so that its central axis is perpendicular to the first substrate 510, the second substrate 520, and the second ground plate 42.

  With the connection structure using the connection pins 30, the third distribution line 13A and the fourth distribution line 14A of the first transmission unit 1A, the third distribution line 13B and the fourth distribution line 14B of the second transmission unit 1B, and the third transmission The third distribution line 13C and the fourth distribution line 14C of the unit 1C are connected to the third distribution line 13D and the fourth distribution line 14D of the fourth transmission unit 1D, respectively.

  In the vicinity of the connection pin 30, the metal spacer 50 disposed between the first ground plate 41 and the second ground plate 42 and the second ground plate 42 and the third ground plate 43 are disposed. A metal spacer 50 is disposed. In the following description, the metal spacer 50 disposed between the first ground plate 41 and the second ground plate 42 is referred to as a “metal spacer 50A”, and the second ground plate 42, the third ground plate 43, The metal spacer 50 disposed between the two is referred to as “metal spacer 50B”. The metal spacer 50A and the metal spacer 50B are one aspect of the ground conductor of the present invention that is electrically grounded.

  The metal spacer 50 </ b> A and the metal spacer 50 </ b> B are connected via the insertion hole 42 a of the second ground plate 42. Specifically, the male thread portion 502 of the metal spacer 50B is screwed into the screw hole 500 of the metal spacer 50A. Thus, the second ground plate 42 is sandwiched between the shaft portions 501 of the metal spacer 50A and the metal spacer 50B.

As shown in FIG. 10, when the distance between the connecting pin 30 and the metallic spacer 50B in the direction parallel to the second ground plate 42 and _{d 1,} the distance _{d 1} is 2.5mm or less. Incidentally, the distance _{d 1} is in a direction parallel to the second ground plate 42, it refers to the shortest distance between the outer peripheral surface 50a of the outer peripheral surface 30a and the metal spacer 50B of the connecting pin 30.

Further, when the metal spacer 50 has a polygonal cross section as in the present embodiment, no matter what angle (phase) the metal spacer 50 is fixed in the circumferential direction around the central axis, as distance _{d 1} between the connection pin 30 is 2.5mm or less, the second is the position of such insertion hole 42a of the ground plate 42 is set desirably. That is, in this embodiment, a position where the interval d ₁ between the connection pin 30 is 2.5mm or less as the metal spacer 50B is fixed at any angle in the circumferential direction around its central axis, The metal spacer 50B is fixed. In addition, although illustration is abbreviate | omitted, the metal spacer 50A is being fixed so that the space | interval of the connection pin 30 and the metal spacer 50A may also be 2.5 mm or less similarly to the above.

11, when the first central conductor 51 via a connecting pin 30 to the second central conductor 52 for transmitting a 2GHz frequency signal, connecting pin 30 and the metallic spacer 50A, the spacing _{d 1} between 50B, 6 is a graph showing the relationship between transmission loss (S parameter S ₂₁ indicating pass characteristics) at a connection portion 3 between a first center conductor 51 and a second center conductor 52 by a connection pin 30;

As shown in this graph, the connection pin 30 and the metallic spacer 50A, if the distance _{d 1} between 50B and 2.5mm or less, it is possible to suppress the transmission loss to 0.1dB or less. That is, if the distance d ₁ is 2.5 mm or less, good transmission characteristics can be obtained at the connection portion 3. The reason why the transmission loss is reduced by arranging the metal spacers 50A and 50B in the vicinity of the connection pin 30 is that the current path of the current flowing through the connection pin 30 and the current path of the plurality of metal spacers 50 are One possible reason is that the difference in path length is reduced.

Note that the distance d ₁ is 1 due to prevention of a short circuit between the first center conductor 51 or the second center conductor 52 and the metal spacers 50A and 50B and processing restrictions of the first substrate 510 and the second substrate 520. It is desirable to ensure 0.0 mm or more.

(Configuration of phase shifter and moving mechanism)
FIG. 12 is a perspective view illustrating a configuration example of the phase shifter 20.

  The phase shifter 20 is a dielectric insertion type phase shifter having a movable dielectric plate 21 disposed between the first ground plate 41 and the first center conductor 51. The phase shifter 20 can change the phase of the high-frequency signal distributed to the plurality of antenna elements 15 by moving the dielectric plate 21 with respect to the first central conductor 51.

  The first central conductor 51 has a meandering shape in a portion facing the dielectric plate 21. That is, the first central conductor 51 has first to fifth extending portions 511 to 515 extending in a direction orthogonal to the moving direction of the dielectric plate 21.

  The dielectric plate 21 has first to fifth dielectric portions 211 to 215 corresponding to the first to fifth extending portions 511 to 515 of the first central conductor 51, respectively. The fifth dielectric portions 211 to 215 are connected along the longitudinal direction of the dielectric plate 21. In addition, drive shafts 22 for moving the dielectric plate 21 in the longitudinal direction are provided upright at both ends of the dielectric plate 21 in the longitudinal direction. The drive shaft 22 passes through the dielectric plate 21 and moves along a long hole 510 c formed in the first substrate 510.

  In the present embodiment, the first to fifth dielectric portions 211 to 215 are triangular, and the first to fifth extending portions 511 to 515 are moved by moving the dielectric plate 21 in the longitudinal direction. And the overlapping area where the first to fifth dielectric portions 211 to 215 overlap with each other increases or decreases. And the effective dielectric constant in the 1st thru | or 5th extension parts 511-515 changes with the change of this overlapping area, and the electrical line length of the 1st thru | or 5th extension parts 511-515 changes in connection with this. By doing so, the phase can be adjusted.

  The dielectric plate 21 is moved in the central axis direction of the radome 10 by the moving mechanism 6 shown in FIG. The moving mechanism 6 includes an electric motor 61, a linear motion shaft 62 that moves linearly by the torque of the electric motor 61, a pair of arm portions 63 that extend in a direction orthogonal to the moving direction of the linear motion shaft 62, and a pair of arms. And a plurality of connecting rods 64 connected to the portion 63. The connecting rod 64 is connected to the drive shaft 22 of the dielectric plate 21 that is inserted through a long hole (not shown) formed in the first ground plate 41. As a result, the plurality of connecting rods 64 move together with the dielectric plate 21 by the rotation of the electric motor 61, and the plurality of antenna elements 15 (first horizontal polarization antenna element 15A, first vertical polarization antenna element 15B, second horizontal polarization). The phases of the horizontal and vertical polarizations of the first frequency band and the second frequency band radiated from the polarization antenna element 15C and the second vertical polarization antenna element 15D) are adjusted.

(Operation and effect of the embodiment)
According to the embodiment described above, by arranging the metal spacer 50 (metal spacer 50A, 50B) that is electrically grounded in the vicinity of the connection pin 30, the first central conductor 51 and the first center conductor 51 formed by the connection pin 30 are arranged. The transmission loss in the connection portion 3 with the second central conductor 52 is reduced. In particular, by connecting pin 30 and the metallic spacer 50A, the spacing _{d 1} between 50B to 2.5mm or less, the effect of reducing the transmission loss becomes remarkable. Further, since these metal spacers 50 also have a function of fixing the first to third ground plates 41 to 43 to each other, it is possible to contribute to a reduction in the number of parts and assembly man-hours.

(Summary of embodiment)
Next, the technical idea grasped from the embodiment described above will be described with reference to the reference numerals in the embodiment. However, each reference numeral in the following description does not limit the constituent elements in the claims to members or the like specifically shown in the embodiment.

[1] A transmission line (100) through which a high-frequency signal propagates and a plurality of antenna elements (15) connected to the transmission line (100), the transmission lines (100) being arranged in parallel to each other, First to third plate-like conductors (41 to 43) that are electrically grounded, and a first plate-like conductor (41) disposed between the first plate-like conductor (41) and the second plate-like conductor (42). One central conductor (51), a second central conductor (52) disposed between the second plate conductor (42) and the third plate conductor (43), and the second A connecting member (30) for electrically connecting the first central conductor (51) and the second central conductor (52) through an insertion hole (42b) formed in the plate-shaped conductor (42) ) And a contact disposed in the vicinity of the connection member (30) and electrically connected to the second plate conductor (42). Conductors (50A, 50B) antenna unit comprising a, a (1).

[2] A distance (d ₁ ) between the connection member (30) and the ground conductor (50) in a direction parallel to the second plate conductor (42) is 2.5 mm or less. The antenna device (1) described.

[3] The first center conductor (51) is made of a metal foil provided on the surface of the first substrate (510) made of a dielectric, and the second center conductor (52) is made of a dielectric. The ground conductor (50) is made of a metal foil provided on the surface of the second substrate (520), and the ground conductor (50) is inserted through holes (510a, 520a) formed in the first and second substrates (510, 520). ) And the antenna device (1) according to [1] or [2], which is disposed between the first plate-like conductor (41) and the third plate-like conductor (43).

[4] The ground conductor (50) is disposed between the first plate conductor (41) and the second plate conductor (42), and between the second plate conductor (42) and the first plate conductor (42). And the ground conductor (50) disposed between the first plate conductor (41) and the second plate conductor (42). The ground conductor (50) disposed between the second plate conductor (42) and the third plate conductor (43) is formed on the second plate conductor (42). The antenna device (1) according to [3], which is connected through the inserted insertion hole (42a).

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

  In addition, the present invention can be appropriately modified and implemented without departing from the gist thereof. For example, in the above embodiment, the case where the first central conductor 51 and the second central conductor 52 are made of metal foil provided on the surfaces of the first substrate 510 and the second substrate 520, respectively, has been described. For example, the first central conductor 51 and the second central conductor 52 may be formed by linear conductors formed by punching a copper plate into a predetermined shape.

  Further, the metal spacer 50A and the metal spacer 50B may be integrated. That is, a metal spacer made of one conductor may be disposed between the first ground plate 41 and the third ground plate 43, and this metal spacer may be disposed in the vicinity of the connection pin 30.

  The application of the antenna device is not limited to a mobile phone base station.

1 ... Frequency sharing antenna device (antenna device)
DESCRIPTION OF SYMBOLS 100 ... Transmission line 15 ... Antenna element 15A ... Horizontal polarization antenna element 15B ... Vertical polarization antenna element 15C ... Horizontal polarization antenna element 15D ... Vertical polarization antenna element 30 ... Connection pin (connection member)
41... First ground plate (first plate conductor)
42 ... Second ground plate (second plate conductor)
43 ... Third ground plate (third plate-like conductor)
42b ... Connection pin insertion holes 50, 50A, 50B ... Metal spacer (grounding conductor)
51 ... 1st center conductor 52 ... 2nd center conductor 510 ... 1st board | substrate 520 ... 2nd board | substrate

Claims (3)

A transmission line through which a high-frequency signal propagates, and a plurality of antenna elements connected to the transmission line,
The transmission line is
Electrically grounded first to third plate conductors;
A first central conductor disposed between the first plate-shaped conductor and the second plate-shaped conductor; and a first central conductor disposed between the second plate-shaped conductor and the third plate-shaped conductor. A second central conductor;
A connection member that is inserted through an insertion hole formed in the second plate-like conductor to electrically connect the first center conductor and the second center conductor;
A grounding conductor disposed in the vicinity of the connecting member and electrically grounded;
Equipped with a,
The first central conductor is made of a metal foil provided on the surface of the first substrate made of a dielectric,
The second central conductor is made of a metal foil provided on the surface of a second substrate made of a dielectric,
The ground conductor is disposed between the first plate-like conductor and the third plate-like conductor through the insertion holes formed in the first and second substrates.
Antenna device. An interval between the connection member and the ground conductor in a direction parallel to the second plate conductor is 2.5 mm or less;
The antenna device according to claim 1. The ground conductor is disposed between the first plate-like conductor and the second plate-like conductor, and between the second plate-like conductor and the third plate-like conductor,
The ground conductor disposed between the first plate-shaped conductor and the second plate-shaped conductor, and the above-described disposed between the second plate-shaped conductor and the third plate-shaped conductor. The ground conductor is connected via an insertion hole formed in the second plate-like conductor,
The antenna device according to claim 1 or 2 .

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