Antenna device

Abstract

To provide a small-sized right / left circularly polarized wave shared antenna at low cost.SOLUTION: An antenna device includes a first cross dipole antenna and a second cross dipole antenna. The first cross dipole antenna includes a pair of L-shaped first antenna elements facing each other across an antenna central axis, and radiates a first circularly polarized radio wave rotating in a first direction. The second cross dipole antenna includes a pair of L-shaped second antenna elements facing each other across the antenna central axis and adjacent to the pair of first antenna elements, and radiates a second circularly polarized radio wave rotating in a second direction opposite to the first direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an antenna device, and more particularly to a dual-circularly polarized antenna that can simultaneously transmit and receive right-handed circularly polarized radio waves and left-handed circularly polarized radio waves. [Background technology]

[0002] When communicating with rockets or artificial satellites via radio waves, the antenna orientation changes, so circularly polarized radio waves are used to accommodate this change. In this case, two types of circularly polarized waves, right-handed and left-handed, are used depending on the communication situation or the uplink and downlink.

[0003] One way to transmit and receive two circularly polarized radio waves is to place a right-handed circularly polarized antenna and a left-handed circularly polarized antenna side by side, but in this case the antennas occupy a large area.

[0004] Another means for transmitting and receiving two circularly polarized radio waves is to use a dual-circularly polarized antenna that can simultaneously transmit and receive right-handed and left-handed circularly polarized waves. This solves the problem of using two antennas, one for right-handed circularly polarized waves and one for left-handed circularly polarized waves. Examples of dual-circularly polarized antennas are shown in Patent Documents 1, 2, and 3. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2021-005817 [Patent Document 2] Japanese Patent Application Publication No. 03-267804 [Patent Document 3] Japanese Patent Application Publication No. 07-263947 Summary of the Invention [Problem to be solved by the invention]

[0006] The circularly polarized antenna of Patent Document 1 has a problem in that it is made up of a multi-layer structure with a complex shape, resulting in high manufacturing costs. Furthermore, the circularly polarized antenna of Patent Document 2 is an array antenna that is composed of a power divider, a circular polarizer, and a polarizer in addition to the antenna radiating element, which increases the number of parts and raises the manufacturing cost. Furthermore, the circularly polarized antenna of Patent Document 3 is configured with a conical horn and a waveguide, which increases the length in the axial direction and the size of the antenna.

[0007] In view of the above circumstances, an object of the present invention is to provide a low-cost, small-sized antenna for both right- and left-handed circular polarization. [Means for solving the problem]

[0008] An antenna device according to an aspect of the present invention includes a first cross dipole antenna and a second cross dipole antenna. The first cross dipole antenna has a pair of L-shaped first antenna elements facing each other across a central axis of the antenna, and radiates a first circularly polarized radio wave that rotates in a first direction. The second cross dipole antenna has a pair of L-shaped second antenna elements that face each other across the antenna central axis and are adjacent to the pair of first antenna elements, and radiates a second circularly polarized radio wave that rotates in a second direction opposite to the first direction.

[0009] The antenna device is configured with two cross dipole antennas, which have a simple structure. The first cross dipole antenna and the second cross dipole antenna each have a common antenna center axis. This allows for the provision of a small, low-cost, dual-purpose right- and left-handed circularly polarized antenna.

[0010] At least a portion of the pair of first antenna elements and at least a portion of the pair of second antenna elements may be located on the same plane.

[0011] The pair of first antenna elements and the pair of second antenna elements may each have two shaft portions that form the L-shape and have different lengths.

[0012] The first cross dipole antenna may further include a first feed cable having an inner conductor connected to one of the pair of first antenna elements and an outer conductor connected to the other of the pair of first antenna elements, and the second cross dipole antenna may further include a second feed cable having an inner conductor connected to one of the pair of second antenna elements and an outer conductor connected to the other of the pair of second antenna elements.

[0013] The antenna device may further include a support substrate that supports the first cross dipole antenna and the second cross dipole antenna.

[0014] The antenna device may further include a reflector disposed away from the first cross dipole antenna and the second cross dipole antenna.

[0015] The reflector may have any shape, such as a flat or parabolic shape. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a small, low-cost antenna for both right- and left-handed circular polarization. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic perspective view showing a configuration of an antenna device according to a first embodiment of the present invention. [Figure 2] 2 is a plan view of a main part of the antenna device as seen from the direction of the antenna center axis. FIG. [Figure 3] The analysis values ​​of (1) right-handed circularly polarized waves and (2) left-handed circularly polarized waves of the antenna pattern of the antenna device shown in FIG. 1 are displayed in polar coordinates. [Figure 4] FIG. 10 is a schematic perspective view showing the configuration of an antenna device according to a second embodiment of the present invention. [Figure 5] The analysis values ​​of (1) right-handed circularly polarized waves and (2) left-handed circularly polarized waves of the antenna pattern of the antenna device shown in FIG. 4 are displayed in polar coordinates. [Figure 6] FIG. 10 is a schematic perspective view showing the configuration of an antenna device according to a third embodiment of the present invention. [Figure 7] The analysis values ​​of (1) right-handed circularly polarized waves and (2) left-handed circularly polarized waves of the antenna pattern of the antenna device shown in FIG. 6 are displayed in polar coordinates. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] First Embodiment FIG. 1 is a schematic perspective view showing the configuration of an antenna device 100 according to a first preferred embodiment of the present invention, and FIG. 2 is a plan view of a main part of the antenna device 100 as viewed from the positive direction of the z axis.

[0020] In each figure, the x-axis, y-axis, and z-axis indicate three mutually orthogonal axial directions, and the z-axis corresponds to the antenna central axis of the antenna device 100. In the following description, the intersection (origin) of the x-axis, y-axis, and z-axis is also referred to as the antenna center O.

[0021] [Overall configuration of the antenna device] As shown in FIG. 1, the antenna device 100 includes a first cross dipole antenna 11, a second cross dipole antenna 12, and a support 13 that supports the first and second cross dipole antennas 11 and 12.

[0022] The first cross dipole antenna 11 has a pair of first antenna elements 11A and 11B and a first feed cable 110. The first cross dipole antenna 11 is configured to be capable of radiating a first circularly polarized radio wave (e.g., right-handed circularly polarized radio wave) that rotates in a first direction (e.g., clockwise).

[0023] The first antenna elements 11A and 11B each have two axis portions x1 and y1 that are parallel to the x-axis and y-axis directions and form an L-shape, and are arranged on the support 13 so as to face each other across the antenna central axis (z-axis). The first antenna elements 11A and 11B are made of a metal such as copper or aluminum that is formed on the surface (element mounting surface 131) of the support 13.

[0024] The first feed cable 110 is a coaxial cable having a core wire (inner conductor) 110a connected to the first antenna element 11A on one side and a shield wire (outer conductor) 110b connected to the first antenna element 11B on the other side. The first feed cable 110 connects the first antenna elements 11A and 11B to a transceiver (not shown).

[0025] The second cross dipole antenna 12 has a pair of second antenna elements 12A and 12B and a second feed cable 120. The second cross dipole antenna 11 is configured to be capable of radiating a second circularly polarized radio wave (e.g., left-handed circularly polarized radio wave) that rotates in a second direction (e.g., counterclockwise) opposite to the first direction.

[0026] The second antenna elements 12A and 12B each have two axis portions x2 and y2 that are parallel to the x-axis and y-axis directions and form an L-shape, and are arranged on the support 13 so as to face each other across the antenna central axis (z-axis) and be adjacent to the first antenna elements 11A and 11B. The second antenna elements 12A and 12B are made of a metal such as copper or aluminum and formed on the surface (element mounting surface 131) of the support 13.

[0027] More specifically, as shown in FIG. 2, first antenna elements 11A and 11B are arranged in the first and third quadrants, respectively, on an xy orthogonal coordinate plane, and second antenna elements 12A and 12B are arranged in the second and fourth quadrants, respectively.

[0028] The second feed cable 120 is a coaxial cable having a core wire (inner conductor) 120a connected to the second antenna element 12A on one side and a shield wire (outer conductor) 120b connected to the second antenna element 12B on the other side. The second feed cable 120 connects the second antenna elements 12A and 12B to a transceiver (not shown).

[0029] The support 13 is a dielectric substrate having an element mounting surface 131 parallel to the xy plane. The support 13 can be configured, for example, by a dielectric layer of a multilayer wiring substrate, and a conductor layer formed on one surface (element mounting surface 131) is patterned into a predetermined shape to form a pair of first antenna elements 11A, 11B and a pair of second antenna elements 12A, 12B.

[0030] On the other hand, on the back surface of the support 13 opposite the element mounting surface 131, connectors (not shown) that are connected to the first power feed cable 110 and the second power feed cable 120, and multiple wiring patterns L1 to L4 that connect these power feed cables 110, 120 to the antenna elements 11A, 11B, 12A, 12B are formed.

[0031] The wiring pattern L1 connects the core 110a of the first feed cable 110 and the first antenna element 11A on one side, and the wiring pattern L2 connects the shielded wire 110b of the first feed cable 110 and the first antenna element 11B on the other side. The wiring pattern L3 connects the core 120a of the second feed cable 120 and the second antenna element 12A on one side, and the wiring pattern L4 connects the shielded wire 120b of the second feed cable 120 and the second antenna element 12B on the other side.

[0032] The wiring patterns L1 and L2 are respectively connected to the L-shaped joints (connection parts of the shaft parts x1 and y1), xy1a and xy1b, of the first antenna elements 11A and 11B through vias or through-holes (interlayer connection parts), not shown, that penetrate the support 13 in the thickness direction. The wiring patterns L3 and L4 are respectively connected to the L-shaped joints (connection parts of the shaft parts x2 and y2), xy2a and xy2b, of the second antenna elements 12A and 12B through vias or through-holes (interlayer connection parts), not shown, that penetrate the support 13 in the thickness direction.

[0033] [Details of the First and Second Antenna Elements] Next, the details of the first and second antenna elements 11A, 11B, 12A, and 12B will be described.

[0034] As shown in FIG. 2, the first antenna elements 11A and 11B have a shape symmetric with respect to the antenna center O, and the respective L-shaped joints xy1a and xy1b are located on the straight line y = x.

[0035] Here, for the first antenna element 11A on one side, the joint xy1a is located at the coordinates (Px1, Py1), the shaft part x1 extends parallel to the x-axis in the +x direction from the joint xy1a, the shaft part y1 extends parallel to the y-axis in the +y direction from the joint xy1a, and the length (Lx1) of the shaft part x1 is shorter than the length (Ly1) of the shaft part y1 (Lx1 < Ly1). Also, for the first antenna element 11B on the other side, the joint xy1b is located at the coordinates (-Px1, -Py1), the shaft part x1 extends parallel to the x-axis in the -x direction from the joint xy1b, the shaft part y1 extends parallel to the y-axis in the -y direction from the joint xy1b, and the length (Lx1) of the shaft part x1 is shorter than the length (Ly1) of the shaft part y1 (Lx1 < Ly1).

[0036] Similarly, the second antenna elements 12A and 12B have a shape symmetric with respect to the antenna center O, and the respective L-shaped joints xy2a and xy2b are located on the straight line y = -x. That is, the pair of first antenna elements 11A and 11B and the pair of second antenna elements 12A and 12B are in a mutually orthogonal positional relationship.

[0037] Here, for the second antenna element 12A on one side, the joint point xy2a is located on the coordinates (Px2, -Py2), the shaft portion x2 extends from the joint point xy2a in the +x direction parallel to the x-axis, the shaft portion y2 extends from the joint point xy2a in the -y direction parallel to the y-axis, and the length (Lx2) of the shaft portion x2 is shorter than the length (Ly2) of the shaft portion y2 (Lx2 < Ly2). For the second antenna element 12B on the other side, the joint point xy2b is located on the coordinates (-Px2, Py2), the shaft portion x2 extends from the joint point xy2b in the -x direction parallel to the x-axis, the shaft portion y2 extends from the joint point xy2b in the +y direction parallel to the y-axis, and the length (Lx2) of the shaft portion x2 is shorter than the length (Ly2) of the shaft portion y2 (Lx2 < Ly2).

[0038] Furthermore, in the example of FIG. 2, the shaft portion x1 of the first antenna elements 11A and 11B is longer than the shaft portion x2 of the second antenna elements 12A and 12B (Lx1 > Lx2), and the shaft portion y1 of the first antenna elements 11A and 11B is longer than the shaft portion y2 of the second antenna elements 12A and 12B (Ly1 > Ly2).

[0039] The above dimensions Lx1, Ly1, Lx2, Ly2, Px1, Py1, Px2, and Py2 are arbitrarily determined so that a predetermined impedance and a circularly polarized wave of a predetermined rotation can be obtained at the frequency used. Note that Lx1 and Lx2 may have the same value. Also, Ly1 and Ly2 may have the same value. Also, Px1 and Px2 are not limited to having the same value and may have different values. Also, Py1 and Py2 are not limited to having the same value and may have different values.

[0040] In the antenna device 100 of this embodiment configured as described above, the first cross dipole antenna 11 and the second cross dipole antenna 12 are provided with their own first feed cable 110 and second feed cable 120, respectively. When the first cross dipole antenna 11 is a right-handed circularly polarized antenna, the second cross dipole antenna 12 is a left-handed circularly polarized antenna, and therefore, right-handed circularly polarized waves can be transmitted and received via the first feed cable 110, and left-handed circularly polarized waves can be transmitted and received via the second feed cable 120. Conversely, when the first cross dipole antenna 11 is a left-handed circularly polarized antenna, the second cross dipole antenna 12 is a right-handed circularly polarized radio wave antenna, and therefore, left-handed circularly polarized waves can be transmitted and received via the first feed cable 110, and right-handed circularly polarized waves can be transmitted and received via the second feed cable 120.

[0041] In the present invention, an antenna is constructed by arranging two cross dipole antennas, which have a simple structure, on a plane and connecting a feeder cable to each antenna. Therefore, the antenna can be constructed at low cost. Furthermore, according to this embodiment, the antenna center of the first cross dipole antenna 11 and the antenna center of the second cross dipole antenna 12 are aligned, so that the circularly polarized antenna that can simultaneously transmit and receive right-handed circularly polarized radio waves and left-handed circularly polarized radio waves can be made smaller, and the phases of the right-handed circularly polarized radio waves and left-handed circularly polarized radio waves can be aligned.

[0042] Furthermore, according to this embodiment, the first cross dipole antenna 11 and the second cross dipole antenna 12 are arranged on the same plane, so that the antenna device 100 can also be made thinner.

[0043] 1 shows support 13 on which first cross dipole antenna 11 and second cross dipole antenna 12 are mounted, but if first cross dipole antenna 11 and second cross dipole antenna 12 can be stably configured (for example, if antenna elements 11A, 11B, 12A, and 12B are formed from relatively rigid metal plates), support 13 may be omitted. In this case, instead of wiring patterns L1 to L4, first cross dipole antenna 11 and first feeder cable 110, and second cross dipole antenna 12 and second feeder cable 120 are connected via, for example, cables or wires.

[0044] (Application example 1) Figure 3 shows, in polar coordinates, the analytical values ​​of (1) right-handed circularly polarized waves and (2) left-handed circularly polarized waves in the xz plane of the antenna pattern of the antenna device 100 of this embodiment when the radio wave frequency is 2280 MHz, Lx1 = Lx2 = 28 mm, Ly1 = Ly2 = 30 mm, and Px1 = Py1 = Px2 = Py2 = 1 mm.

[0045] As shown in Figures 3(1) and (2), the right-handed circularly polarized wave pattern and the left-handed circularly polarized wave pattern of the antenna device 100 of this embodiment are almost the same, which shows that the antenna device 100 of this embodiment is a right-handed / left-handed circularly polarized wave antenna.

[0046] <Second embodiment> 4 is a schematic perspective view showing the configuration of an antenna device 200 according to a second embodiment of the present invention. The following mainly describes configurations that differ from the first embodiment, and configurations that are the same as those in the first embodiment are given the same reference numerals, and detailed descriptions thereof will be omitted or simplified.

[0047] The antenna device 200 of this embodiment differs from the first embodiment in that a reflector 23 is installed and a pair of first antenna elements 11A, 11B and a pair of second antenna elements 12A, 12B are installed above the reflector 23.

[0048] The pair of first antenna elements 11A, 11B and the pair of second antenna elements 12A, 12B are configured in the same manner as in the first embodiment, and are each arranged on the same plane parallel to the xy plane around the antenna central axis (z axis).

[0049] The reflector 23 is a square metal plate with a side length L parallel to the xy plane, and is disposed with its center 23c spaced a distance H from the antenna center O in the z-axis direction.

[0050] First antenna elements 11A and 11B are connected to a first feeder cable (not shown) to form first cross dipole antenna 11 that radiates a first circularly polarized radio wave (right-handed circularly polarized radio wave) that rotates in a first direction (for example, clockwise). Second antenna elements 12A and 12B are connected to a second feeder cable (not shown) to form second cross dipole antenna 12 that radiates a second circularly polarized radio wave (left-handed circularly polarized radio wave) that rotates in a second direction (for example, counterclockwise). This makes it possible to obtain a dual-circularly polarized antenna that can simultaneously transmit and receive right-handed circularly polarized radio waves and left-handed circularly polarized radio waves with the same antenna center O, as in the first embodiment.

[0051] The first antenna elements 11A, 11B and the second antenna elements 12A, 12B can be disposed directly above the reflector 23 via a columnar body such as a support pillar (not shown) that extends from near the center 23c of the reflector 23 to near the first and second cross dipole antennas 11, 12. In this case, the first and second feed cables can be connected to the first antenna elements 11A, 11B and the second antenna elements 12A, 12B through the interior of the columnar body. As described above, the first antenna elements 11A, 11B and the second antenna elements 12A, 12B can be formed, for example, from a metal plate with relatively high rigidity, thereby maintaining their shapes without requiring a support.

[0052] (Application example 2) 5 shows, in polar coordinates, the analytical values ​​of (1) right-handed circularly polarized waves and (2) left-handed circularly polarized waves in the xz plane of the antenna pattern of the antenna device 200 of this embodiment. Here, the radio wave frequency is 2280 MHz, Lx1 = Lx2 = 28 mm, Ly1 = Ly2 = 30 mm, Px1 = Py1 = Px2 = Py2 = 1 mm, L = 100 mm, and H = 30 mm.

[0053] As shown in Figures 5(1) and (2), the right-handed circularly polarized wave pattern and the left-handed circularly polarized wave pattern of the antenna device 200 of this embodiment are almost the same, which shows that the antenna device 200 of this embodiment is a right-handed / left-handed circularly polarized wave antenna.

[0054] <Third embodiment> 6 is a schematic perspective view showing the configuration of an antenna device 300 according to the third embodiment of the present invention. The following mainly describes configurations that differ from the first embodiment, and configurations that are the same as those in the first embodiment are given the same reference numerals, and detailed descriptions thereof will be omitted or simplified.

[0055] The antenna device 300 of this embodiment differs from the first embodiment in that a reflector 33 is installed and a pair of first antenna elements 11A, 11B and a pair of second antenna elements 12A, 12B are installed above the reflector 33.

[0056] The pair of first antenna elements 11A, 11B and the pair of second antenna elements 12A, 12B are configured in the same manner as in the first embodiment, and are each arranged on the same plane parallel to the xy plane around the antenna central axis (z axis).

[0057] The reflector 33 is a parabolic reflector filled with a dielectric 34. In this embodiment, the first and second cross dipole antennas 11 and 12 are used as primary radiators of the parabolic reflector. The dielectric 34 may be omitted if necessary.

[0058] As in the second embodiment, the first antenna elements 11A, 11B and the second antenna elements 12A, 12B can be disposed directly above the bottom of the reflector 33 via a columnar body such as a support pillar (not shown) that extends from the bottom of the reflector 33 to the vicinity of the first and second cross dipole antennas 11, 12. In this case, the first and second feed cables can be connected to the first antenna elements 11A, 11B and the second antenna elements 12A, 12B through the inside of the columnar body. As described above, the first antenna elements 11A, 11B and the second antenna elements 12A, 12B can be formed, for example, from a metal plate with relatively high rigidity, thereby maintaining their shapes without requiring a support.

[0059] (Application example 3) 7 shows, in polar coordinates, the analytical values ​​of (1) right-handed circularly polarized waves and (2) left-handed circularly polarized waves in the xz plane of the antenna pattern of antenna device 300 of this embodiment. Here, the radio wave frequency is 2280 MHz, Lx1 = Lx2 = 15 mm, Ly1 = Ly2 = 20 mm, Px1 = Py1 = Px2 = Py2 = 1 mm, the aperture diameter D of reflector 33 is 96 mm, the aperture height T of reflector 33 is 28 mm, and the primary radiator depth F is 7 mm. Furthermore, dielectric 34 is high-density polyethylene.

[0060] As shown in Figures 7(1) and (2), the right-handed circularly polarized wave pattern and the left-handed circularly polarized wave pattern of the antenna device 300 of this embodiment are almost the same, which shows that the antenna device 300 of this embodiment is a right-handed / left-handed circularly polarized wave antenna.

[0061] Although the embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to the above-described embodiments and that various modifications can be made.

[0062] For example, in each of the above embodiments, a balun may be provided in the first and second feed cables 110, 120 to prevent unbalanced currents from flowing through the first and second feed cables 110, 120. Furthermore, a phase shifter or an attenuator may be provided between the first or second feed cable 110, 120 and the transmitting / receiving device to compensate for differences in length or characteristics between the first and second feed cables 110, 120. Note that, since it is common knowledge for those skilled in the art that a balun, phase shifter, or attenuator is provided as needed when fabricating an antenna, detailed description of their installation will be omitted in this specification.

[0063] In the above embodiments, the first antenna elements 11A and 11B and the second antenna elements 12A and 12B are entirely arranged on the same plane, but at least a portion of each of these elements may be arranged on the same plane. For example, the junctions xy1a and xy1b of the first antenna elements 11A and 11B and the junctions xy2a and xy2b of the second antenna elements 12A and 12B do not have to be on the same xy plane (they may have different z coordinates). Furthermore, the distance between the junctions xy1a and xy1b of the first antenna elements 11A and 11B and the distance between the junctions xy2a and xy2b of the second antenna elements 12A and 12B do not have to be the same, and may be different.

[0064] Furthermore, in the above embodiment, the axis x1 of the first antenna elements 11A and 11B and the axis x2 of the second antenna elements 12A and 12B are each formed parallel to the x-axis, but this is not limited thereto, and the axis x1 and x2 may be parallel to the x-axis or non-parallel to it.Similarly, the axis y1 and the axis y2 are not limited to being parallel to the y-axis, and the axis y1 and y2 may be parallel to the y-axis or non-parallel to it. [Explanation of symbols]

[0065] 11...First cross dipole antenna 11A, 11B...first antenna element 12...Second cross dipole antenna 12A, 12B...second antenna element 13...Support 23, 33...reflector 100, 200, 300...antenna device 110...First power supply cable 120...Second power supply cable

Claims

1. a first cross dipole antenna having a pair of L-shaped first antenna elements symmetrical with respect to the antenna center, and radiating a first circularly polarized radio wave rotating in a first direction; a second cross dipole antenna having a pair of L-shaped second antenna elements each having a shape symmetrical with respect to the antenna center and adjacent to both of the pair of first antenna elements, and radiating a second circularly polarized radio wave rotating in a second direction opposite to the first direction; An antenna device comprising:

2. 2. The antenna device according to claim 1, At least a portion of the pair of first antenna elements and at least a portion of the pair of second antenna elements are located on the same plane. Antenna device.

3. 3. The antenna device according to claim 2, The pair of first antenna elements and the pair of second antenna elements each have two shaft portions that form the L-shape and have different lengths. Antenna device.

4. 4. The antenna device according to claim 3, the first cross dipole antenna further includes a first feed cable having an inner conductor connected to one of the pair of first antenna elements and an outer conductor connected to the other of the pair of first antenna elements; The second cross dipole antenna further includes a second feed cable having an inner conductor connected to one of the pair of second antenna elements and an outer conductor connected to the other of the pair of second antenna elements. Antenna device.

5. 2. The antenna device according to claim 1, The antenna further includes a support substrate that supports the first cross dipole antenna and the second cross dipole antenna. Antenna device.

6. 2. The antenna device according to claim 1, The antenna further includes a reflector disposed away from the first cross dipole antenna and the second cross dipole antenna. Antenna device.

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