Antenna Device

Abstract

To provide an antenna device which is widely adopted to a plurality of frequency bands and realizes an excellent antenna characteristic and miniaturization.SOLUTION: An antenna device comprises: a first dipole antenna adopted to a first frequency band; and a second dipole antenna adopted to a second frequency band. The first dipole antenna and the second dipole antenna are arranged at the same height from a first bottom board. The first dipole antenna and the second dipole antenna are arranged in close contact and in parallel. The second dipole antenna is arranged at a constant height from a second bottom board. The second bottom board is arranged at a constant height from the first bottom board.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an antenna device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, antennas disclosed in Patent Documents 1, 2 and 3, for example, are known as frequency-shared antennas capable of transmitting and receiving radio waves in a plurality of frequency bands. In Patent Document 1, as the antenna element of each antenna unit, a folded dipole antenna element having a linear element conductor and a folded conductor provided in parallel to the side of the element conductor is used. Patent document 2 comprises a first dipole antenna constructed on a first dielectric substrate, which is disposed at a predetermined first distance from a reflector and transmits and receives radio waves in a first frequency band, and a second dipole antenna constructed on a second dielectric substrate, which is disposed at a predetermined second distance from the reflector on the side of the reflector where the first dipole antenna is disposed, and which transmits and receives radio waves in a second frequency band higher than the first frequency band. Patent Document 3 includes a first antenna element array having a plurality of vertically polarized dipole elements resonating in a first frequency band arranged in the vertical direction, a second antenna element array having a plurality of horizontally polarized dipole elements resonating in the first frequency band arranged in the vertical direction near the first antenna element array without overlapping with the first antenna element array, a third antenna element array having a plurality of polarized dual-polarized elements resonating in the second frequency band and sharing two different polarized waves arranged in the vertical direction near a first subarray without overlapping with the first subarray and the second antenna element array, and a fourth antenna element array having a plurality of polarized dual-polarized elements resonating in the third frequency band and sharing two different polarized waves arranged in the vertical direction near the second subarray without overlapping with the second subarray and the second antenna element array. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5496967 [Patent Document 2] Patent No. 5745582 [Patent Document 3] Patent No. 6470382 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for antennas that are compact and have good antenna characteristics that can be widely applied to multiple frequency bands available for mobile communication systems. However, the above-mentioned conventional antennas have not been sufficient.

[0005] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to achieve wide application to a plurality of frequency bands, good antenna characteristics, and compact size. [Means for solving the problem]

[0006] One aspect of the present invention is 800 MHz band The first dipole antenna is applied to 4.5 GHz band and a second dipole antenna applied to the above-mentioned, wherein the first dipole antenna and the second dipole antenna are arranged on the same first base plate. 55mm The first dipole antenna and the second dipole antenna are disposed at a height Parallel with 35mm spacing The second dipole antenna is disposed at a certain distance from the second ground plane. 14mm The second base plate is disposed at a certain height from the first base plate. 41mm Located at height, The second ground plane is a rectangular box-shaped conductor having a width of 80 mm and a length of 80 mm. It is an antenna device. According to one aspect of the present invention, in the antenna device, the first dipole antenna and the second dipole antenna are Keeping the above interval The antenna device is shifted in the planar direction of the first base plate. According to one aspect of the present invention, in the antenna device, a plurality of the second dipole antennas are provided for one of the first dipole antennas. Parallel to the above interval The antenna device is arranged as follows. One aspect of the present invention is the antenna device, wherein the first dipole antenna and the second dipole antenna are each provided with an antenna element for horizontal polarization and an antenna element for vertical polarization. Effect of the Invention

[0007] According to the present invention, it is possible to obtain the effects of being widely applicable to a plurality of frequency bands, achieving good antenna characteristics, and miniaturization. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating a configuration of an antenna device according to an embodiment. [Diagram 2] 1 is a diagram illustrating a configuration of an antenna device according to an embodiment. [Diagram 3] 1 is a diagram illustrating a configuration of an antenna device according to an embodiment. [Figure 4] 1 is a diagram illustrating a configuration of an antenna device according to an embodiment. [Diagram 5] FIG. 2 is a dimensional diagram of a first dipole antenna and a second dipole antenna according to an embodiment. [Figure 6] 11 is a graph showing a simulation result of the antenna device according to the embodiment. FIG. [Figure 7] 11 is a graph showing a simulation result of the antenna device according to the embodiment. FIG. [Figure 8] 11 is a graph showing a simulation result of the antenna device according to the embodiment. FIG. [Figure 9] 11A and 11B are diagrams illustrating a configuration of a modified example of an antenna device according to an embodiment. [Figure 10] 11A and 11B are diagrams illustrating a configuration of a modified example of an antenna device according to an embodiment. [Figure 11]11A and 11B are diagrams illustrating a configuration of a modified example of an antenna device according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] The configuration of the antenna device 1 according to this embodiment will be described with reference to Figs. 1 to 4. Figs. 1 to 4 are diagrams showing the configuration of the antenna device 1 according to this embodiment. Fig. 1 is an overall external view of the antenna device 1 according to this embodiment. Fig. 2 is a top view of the antenna device 1 according to this embodiment. Fig. 3 is an external view of the side of the first dipole antenna 100 according to this embodiment. Fig. 4 is an external view of the side of the second dipole antenna 200 according to this embodiment.

[0011] 1 and 2, the antenna device 1 includes a first dipole antenna 100 and a second dipole antenna 200. The first dipole antenna 100 is composed of two antenna elements made of flat conductors, and a feed point 41 is provided between the antenna elements. The second dipole antenna 200 is composed of two antenna elements made of flat conductors, and a feed point 42 is provided between the antenna elements.

[0012] The first dipole antenna 100 and the second dipole antenna 200 are disposed in close proximity to each other. parallel The first dipole antenna 100 is disposed at a fixed height from the first ground plate 31. The first ground plate 31 is a flat conductor. The first dipole antenna 100 is fed from a feeding point 41. The second dipole antenna 200 is disposed at a fixed height from the second ground plate 32. The second ground plate 32 is a rectangular box-shaped conductor. The second dipole antenna 200 is fed from a feeding point 42.

[0013] 3, the first dipole antenna 100 is disposed at a certain height H from the first ground plate 31 by the insulator 150. The first dipole antenna 100 is fed with power from a feeding point 41 by a feeding line 160.

[0014] 4, the second dipole antenna 200 is disposed at a constant height H2 from the second ground plate 32 by an insulator (not shown). The second ground plate 32 is disposed at a constant height "H-H2" from the first ground plate 31 by an insulator 250. As a result, the second dipole antenna 200 is disposed at a constant height H from the first ground plate 31. Therefore, the first dipole antenna 100 and the second dipole antenna 200 are disposed at the same height H from the first ground plate 31. The second dipole antenna 200 is fed from a feeding point 42 by a feeding line 260.

[0015] The first dipole antenna 100 is applied to a first frequency band. The second dipole antenna 200 is applied to a second frequency band. In one example of this embodiment, the first dipole antenna 100 is applied to the 800 megahertz (MHz) band, and the second dipole antenna 200 is applied to the 4.5 gigahertz (GHz) band.

[0016] Fig. 5 is a dimensional diagram of the first dipole antenna and the second dipole antenna according to this embodiment. The dimensions of the first dipole antenna 100 and the second dipole antenna 200 will be described with reference to Fig. 5. Here, an example of dimensions when the first dipole antenna 100 uses a frequency band of 800 MHz and the second dipole antenna 200 uses a frequency band of 4.5 GHz is shown below. The unit is millimeters (mm).

[0017] (First dipole antenna 100: Frequency band used: 800MHz band) Wa1=150 Wb1=20

[0018] (Second dipole antenna 200, second base plate 32: frequency band used "4.5 GHz band") Wa2=70 Wb2=10 Wa3=80 Wb3=80

[0019] Moreover, the height H from the first base plate 31 to the first dipole antenna 100 and the second dipole antenna 200 is "H=55 mm." The height H2 from the second base plate 32 to the second dipole antenna 200 is "H2=14 mm."

[0020] 6, 7, and 8 are graphs showing the results of a simulation of the antenna device 1 according to the present embodiment. The simulation in FIG. 6 is a simulation of return loss characteristics. The simulations in FIG. 7 and FIG. 8 are simulations of antenna directivity characteristics in a horizontal plane. The antenna device 1 used in FIG. 6, FIG. 7, and FIG. 8 is an example in which the above-mentioned dimensions of the first dipole antenna 100 and the second dipole antenna 200 are applied. Therefore, the frequency band used by the first dipole antenna 100 is the 800 MHz band, and the frequency band used by the second dipole antenna 200 is the 4.5 GHz band. In addition, the first dipole antenna 100 and the second dipole antenna 200 are disposed at a height of 55 mm from the first ground plate 31. The second dipole antenna 200 is disposed at a height of 14 mm from the second ground plate 32.

[0021] In the graph of FIG. 6, the horizontal axis is frequency (unit: gigahertz (GHz)) and the vertical axis is return loss (unit: decibels (dB)). The graph of FIG. 6 shows two graph waveforms S1 and S2. Graph waveform S1 is the return loss characteristic of first dipole antenna 100, and in the frequency band "800 MHz band" used by first dipole antenna 100, the return loss is "-10 dB" or less, which is a good result. Graph waveform S2 is the return loss characteristic of second dipole antenna 200, and in the frequency band "4.5 GHz band" used by second dipole antenna 200, the return loss is "-10 dB" or less, which is a good result.

[0022] In the graph of Fig. 7, the graph waveform FH1 shows the antenna directivity characteristic in the horizontal plane in the frequency band "800 MHz band" used by the first dipole antenna 100, and good antenna directivity characteristic without distortion is obtained. In the graph of Fig. 8, the graph waveform FH2 shows the antenna directivity characteristic in the horizontal plane in the frequency band "4.5 GHz band" used by the second dipole antenna 200, and good antenna directivity characteristic without distortion is obtained.

[0023] The return loss characteristics and antenna directivity characteristics shown in Figures 6, 7, and 8 are good results that can be applied to a mobile communication system. For example, the antenna device 1 can be applied to a fourth generation mobile communication system (4G) and a fifth generation mobile communication system (5G).

[0024] According to this embodiment, good antenna characteristics can be obtained in the operating frequency bands of, for example, the 800 MHz band and the 4.5 GHz band by the first dipole antenna 100 and the second dipole antenna 200. Furthermore, since the first dipole antenna 100 and the second dipole antenna 200 can be arranged close to each other, the antenna device 1 can be made smaller.

[0025] Next, some modified examples of the antenna device according to this embodiment will be described with reference to Figures 9 to 11. In Figures 9 to 11, parts corresponding to the above-mentioned antenna device 1 (Figures 1 to 4) are given the same reference numerals.

[0026] (First Modification) Fig. 9 is a top view showing the configuration of a first modified example of the antenna device according to this embodiment. As shown in Fig. 9, in the antenna device 1a, the positional relationship between the first dipole antenna 100 and the second dipole antenna 200 in the antenna device 1 of Fig. 2 is shifted in the plane direction of the first ground plate 31. In this way, the first dipole antenna 100 and the second dipole antenna 200 may be shifted in the plane direction of the first ground plate 31 while being kept close to each other.

[0027] (Second Modification) Fig. 10 is a top view showing the configuration of a second modified example of the antenna device according to this embodiment. As shown in Fig. 10, the antenna device 1b includes one first dipole antenna 100 and multiple (four in Fig. 10) second dipole antennas 200. Each second dipole antenna 200 is disposed adjacent to the first dipole antenna 100. In this manner, multiple second dipole antennas 200 may be disposed adjacent to one first dipole antenna 100.

[0028] (Third Modification) FIG. 11 is a top view showing the configuration of a third modified example of the antenna device according to this embodiment. In the third modification, the first dipole antenna 100 and the second dipole antenna 200 of FIG. 10 of the second modification described above are provided with an antenna element for horizontal polarization and an antenna element for vertical polarization. As shown in FIG. 11, the antenna device 1c includes a first dipole antenna 100h for horizontal polarization and a first dipole antenna 100v for vertical polarization for the first dipole antenna 100 of FIG. 10. The antenna device 1c also includes a second dipole antenna 200h for horizontal polarization and a second dipole antenna 200v for vertical polarization for the second dipole antenna 200 of FIG. 10. In this way, the first dipole antenna 100 and the second dipole antenna 200 may be provided with an antenna element for horizontal polarization and an antenna element for vertical polarization. The third modification may be applied to the antenna device 1 (FIGS. 1 to 4) and the first modification (FIG. 9) described above.

[0029] As described above, the antenna device according to the present embodiment can be widely applied to a plurality of frequency bands, and can achieve good antenna characteristics and miniaturization. As a result, the antenna device according to the present embodiment can be applied to base stations in mobile communication systems such as the fourth generation mobile communication system (4G) and the fifth generation mobile communication system (5G).

[0030] This will, for example, make it possible to improve the overall service quality of mobile communications systems, thereby contributing to Goal 9 of the United Nations' Sustainable Development Goals (SDGs), which is to "build resilient infrastructure, promote sustainable industrialization and foster innovation."

[0031] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not deviate from the gist of the present invention are also included.

[0032] For example, a perfect electric conductor (PEC) may be used as the conductor. [Explanation of symbols]

[0033] Reference Signs List 1, 1a, 1b, 1c...antenna device, 100, 100h, 100v...first dipole antenna, 200, 200h, 200v...second dipole antenna, 31...first ground plate, 32...second ground plate, 41, 42...feed point, 150...insulator, 160, 260...feed line

Claims

1. A first dipole antenna applicable to the 800 MHz band and a second dipole antenna applicable to the 4.5 GHz band, The first dipole antenna and the second dipole antenna are disposed at the same height of 55 mm from the first ground plane, The first dipole antenna and the second dipole antenna are arranged in parallel with each other with a gap of 35 mm therebetween, The second dipole antenna is disposed at a constant height of 14 mm from the second ground plane, The second base plate is disposed at a constant height of 41 mm from the first base plate, The second ground plane is a rectangular box-shaped conductor having a width of 80 mm and a length of 80 mm. Antenna device.

2. The first dipole antenna and the second dipole antenna are shifted in a plane direction of the first base plate while maintaining the interval.

2. The antenna device according to claim 1.

3. A plurality of the second dipole antennas are arranged in parallel with one of the first dipole antennas at the intervals.

3. An antenna device according to claim 1 or 2.

4. The first dipole antenna and the second dipole antenna are each provided with an antenna element for horizontal polarization and an antenna element for vertical polarization.

4. An antenna device according to claim 1.

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