Antenna device

Abstract

To make an antenna device lighter.SOLUTION: An antenna device 1 includes a patch antenna 2 as a first antenna. The patch antenna 2 includes a top cover 3 as a cover made of resin with a predetermined dielectric constant, a radiation conductor 21 provided on a first surface on one side of the top cover 3 in the -Z direction to which power is supplied, and an antenna substrate 22 as a substrate that is a part of the top cover 3. The patch antenna 2 receives radio waves radiated from a GNSS satellite in the zenith direction.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] Conventionally, a patch antenna installed inside an IP (Instrument Panel) of a vehicle such as an automobile is known. The patch antenna receives, for example, circularly polarized radio waves from GNSS (Global Navigation Satellite System) satellites.

[0003] Also, an antenna device including a patch antenna and another antenna is known. For example, a composite antenna device in which a patch antenna and a TEL antenna are housed in an external cover (top cover) and a bracket is known (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In an antenna device having a patch antenna such as the above composite antenna device, there is a demand for weight reduction.

[0006] An object of the present invention is to reduce the weight of an antenna device.

Means for Solving the Problems

[0007] To solve the above problems, the antenna device of the present invention includes a cover made of resin having a predetermined dielectric constant, and A first antenna provided on one first surface of the cover and including a radiating conductor to which power is supplied and a substrate that is a part of the cover.

Advantages of the Invention

[0008] According to the present invention, the antenna device can be reduced in weight.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention and first to fourth modifications will be described in detail in order with reference to the accompanying drawings. However, the scope of the invention is not limited to the illustrated examples.

[0011] (Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 and 2. First, with reference to FIGS. 1 and 2, the device configuration of the present embodiment will be described. FIG. 1 is a schematic perspective view showing an antenna device 1 of the present embodiment. FIG. 2 is a schematic cross-sectional view showing the antenna device 1.

[0012] As shown in FIG. 1, the antenna device 1 of the present embodiment is an antenna device having at least a patch antenna, and is installed, for example, inside the IP of a vehicle such as an automobile. The antenna device 1 is, for example, an antenna device for GNSS as a wireless communication method. The antenna device 1 receives radio waves from GNSS satellites in order to measure the position of the vehicle. A control unit (not shown) inside the vehicle performs positioning of the vehicle based on the received signal from the antenna device 1. Also, in FIG. 1, three-dimensional X-axis, Y-axis, and Z-axis are taken, and the same applies to other figures.

[0013] GNSS includes communication standards such as GPS (Global Positioning System), QZSS (Quasi-Zenith Satellite System), GLONASS (Global Navigation Satellite System), and Galileo. The radio waves of GNSS are right-handed circularly polarized waves.

[0014] As shown in FIGS. 1 and 2, the antenna device 1 includes a patch antenna 2, a top cover 3, and a bracket 4. The patch antenna 2 is a patch antenna for receiving left-handed circularly polarized waves. The patch antenna 2 includes a radiating conductor 21, an antenna substrate (base) 22, feeding portions 23A and 23B, and a ground conductor 24. However, in FIG. 2, the feeding portions 23A and 23B are omitted.

[0015] The radiating conductor 21 is an electrode of a conductor such as a silver foil formed on the lower surface (-Z direction surface, back surface) of the antenna substrate 22. The radiating conductor 21 is, for example, a substantially square silver foil smaller than the upper surface of the antenna substrate 22 and is pattern-formed on the antenna substrate 22. The feeding portions 23A and 23B are electrically connected to the radiating conductor 21. No perturbation elements (notches, protrusions) are formed on the radiating conductor 21. Note that the radiating conductor 21 may be configured to have perturbation elements formed thereon. The feeding portions 23A and 23B are connected, for example, on the central side of the radiating conductor 21 and at positions that are line-symmetric about the diagonal of the radiating conductor 21.

[0016] The antenna substrate 22 is a plate formed of a resin such as PPE (Polyphenyleneether) (such as polypropylene) material or PC (PolyCarbonate) material as a dielectric having a predetermined dielectric constant (relative permittivity). Using the above resin can make the antenna substrate 22 and the antenna device 1 lighter than using ceramic as the dielectric. Due to the wavelength shortening effect caused by this relative permittivity, the antenna device 1 can be miniaturized. The material of the antenna substrate 22 is not limited to the resin of the dielectric, and may also be other dielectrics such as ceramic, a magnetic material having a predetermined relative permeability μr, or a composite material having a predetermined relative permittivity εr and relative permeability μr. The wavelength shortening effect also occurs with the relative permeability μr. Also, the antenna substrate 22 is part of the top cover 3.

[0017] The power supply parts 23A and 23B are made of a metal conductor, are electrically connected to the radiation conductor 21, and are connected to a circuit part (not shown) for power supply. The power supply parts 23A and 23B serve as two power supply points.

[0018] The ground conductor 24 is an electrode of a metal conductor formed at a position on the upper surface (+Z direction side surface, surface) of the antenna substrate 22 and facing the radiation conductor 21 and is grounded. The ground conductor 24 is, for example, formed as a substantially square silver foil smaller than the outer shape of the lower surface of the antenna substrate 22 on the upper surface of the antenna substrate 22 in a pattern.

[0019] The top cover 3 is a substantially rectangular parallelepiped top cover having an opening on the lower surface, has an internal space, and protects the components stored in the internal space from above. The top cover 3 is integrally molded with the antenna substrate 22 and is formed of a resin such as PPE material or PC material as the same material as the antenna substrate 22. Note that the material of the top cover 3 may be a material other than the resin of the dielectric of the antenna substrate 22, such as ceramic, as described above.

[0020] The bracket 4 is a bracket made of a metal conductor, and covers and supports the opening on the lower surface of the top cover 3 from the lower side (-Z direction side). Assume that the metal of the bracket 4 is SECC (Steel Electrolytic Cold Commercial; electrolytic zinc-plated steel sheet). However, the metal of the bracket 4 is not limited to this, and other metals such as SPTE (Steel Plate Tin Electrolytic; tinplate), copper, gold, and silver may also be used. When circularly polarized radio waves are incident on the bracket 4, it reflects the radio waves with the polarization direction reversed.

[0021] It is assumed that other components such as other antennas such as a TEL antenna and circuit boards can be stored in the internal spaces of the top cover 3 and the bracket 4. However, in FIG. 2, the components stored in the internal spaces of the top cover 3 and the bracket 4 are not shown.

[0022] Also, in the patch antenna 2 of the antenna device 1, it is assumed that the dimensions, positions, and shapes of the radiating conductor 21, the antenna substrate 22, the power feeding parts 23A and 23B, and the ground conductor 24 are designed to resonate at the L1 band of GPS (center frequency: 1575.42 [MHz]).

[0023] Next, with reference to FIG. 2, the operation of the antenna device 1 will be described. The patch antenna 2 is an antenna for receiving left-handed circularly polarized waves, and functions as an antenna that radiates radio waves of left-handed circularly polarized wave L1 in the vertical direction (-Z direction) of the radiating conductor 21. Also, the bracket 4 functions as a reflector for reflecting radio waves.

[0024] Therefore, the left-handed circularly polarized wave L1 radiated from the patch antenna 2 is reflected by the bracket 4 and radiated in the +Z direction as a right-handed circularly polarized wave R1. That is, the received radio wave of the right-handed circularly polarized wave radiated from the GNSS satellite in the -Z direction is reflected by the bracket 4 as a left-handed circularly polarized wave in the +Z direction, and the patch antenna 2 receives the received radio wave of the left-handed circularly polarized wave with the radiating conductor 21.

[0025] The patch antenna 2 only needs to perform the above-mentioned left-handed circular polarization reception operation, and the shapes of the radiation conductor 21 and the ground conductor 24 do not matter. If a patch antenna that radiates right-handed circular polarization is to be formed on the top surface of the top cover 3 (the upper surface on the +Z direction side), the radiation conductor must be provided on the top surface side, and a cover or a protective seal for protecting the radiation conductor is required. However, according to the patch antenna 2, since the radiation conductor 21 is formed on the back surface on the opposite side of the top surface of the top cover 3, a cover or the like does not need to be provided, and the number of components can be reduced.

[0026] As described above, according to the present embodiment, the antenna device 1 includes a patch antenna 2 as a first antenna. The patch antenna 2 includes a top cover 3 as a resin cover having a predetermined dielectric constant, a radiation conductor 21 provided on a first surface on one -Z direction side of the top cover 3 and fed by feeding portions 23A and 23B, and an antenna substrate 22 as a substrate that is a part of the top cover 3. The patch antenna 2 has a ground conductor 24 provided on a second surface on the +Z direction side facing the radiation conductor 21 through the top cover 3.

[0027] Therefore, the antenna device 1 can configure the patch antenna 2 with the antenna substrate 22 common to the top cover 3, and does not newly provide an antenna substrate separate from the top cover 3, so the antenna device 1 having the patch antenna 2 can be lightened.

[0028] Further, the first surface on which the radiation conductor 21 is provided is the surface on the opposite side (-Z direction side) of the top surface of the top cover 3. The antenna device 1 includes a bracket 4 as a reflector provided on the first surface side, which reflects the radio wave by reversing the polarization direction of the circular polarization of the radio wave and supports the top cover 3. The patch antenna 2 receives the received radio wave reflected by the bracket 4. Therefore, it is not necessary to provide a cover or a protective seal for the radiation conductor 21 when the radiation conductor 21 is provided on the zenith direction side, the number of components can be reduced, and the antenna device 1 can be further lightened.

[0029] Further, the received radio wave is a right-handed circular polarization. Therefore, the received radio wave of right-handed circular polarization such as GNSS can be surely received.

[0030] (First Modification Example) Referring to FIG. 3, a first modification example of the above-described embodiment will be described. FIG. 3 is a schematic cross-sectional view showing the antenna device 1a of this modification example.

[0031] The antenna device 1 of the above-described embodiment was configured such that the patch antenna 2 received a left-handed circularly polarized radio wave obtained by reflecting a right-handed circularly polarized radio wave from the +Z direction. The antenna device 1a of this modification example is configured such that the patch antenna directly receives a right-handed circularly polarized radio wave from the +Z direction.

[0032] As shown in FIG. 3, the antenna device 1a of this modification example includes a patch antenna 2a, a top cover 3, and a bracket 4. Here, the same components as those of the antenna device 1 of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0033] The antenna device 1a is an antenna device for receiving right-handed circularly polarized waves. The patch antenna 2a includes a radiation conductor 21a, an antenna substrate 22, two feeding portions (not shown), and a ground conductor 24a. The radiation conductor 21a is an electrode of a conductor such as a silver foil formed on the upper surface of the antenna substrate 22. The two feeding portions are two feeding points electrically connected to the radiation conductor 21a. The ground conductor 24a is an electrode of a metal conductor such as a silver foil formed on the lower surface of the antenna substrate 22 and facing the radiation conductor 21a and grounded.

[0034] The patch antenna 2a is a patch antenna for receiving right-handed circularly polarized waves, and functions as an antenna that radiates a radio wave of right-handed circular polarization R2 in the vertical direction (+Z direction) of the radiation conductor 21a. That is, the patch antenna 2a receives the received radio wave of right-handed circular polarization radiated from the GNSS satellite in the -Z direction by the radiation conductor 21a.

[0035] Since the patch antenna 2a does not reflect the radio wave of right-handed circular polarization R2, the bracket 4 can be made of a material such as resin that does not reflect radio waves, and the weight can be reduced. Alternatively, the patch antenna 2a may be configured without the bracket 4.

[0036] As described above, according to this modification example, in the patch antenna 2a as the first antenna, the first surface on which the radiation conductor 21a is provided is the top surface of the top cover 3. The patch antenna 2a directly receives the GNSS received radio waves from the zenith direction. Therefore, the antenna device 1a can be made simpler and lighter in weight.

[0037] (Second Modification Example) Referring to FIG. 4, a second modification example of the above-described embodiment will be described. FIG. 4 is a schematic cross-sectional view showing the antenna device 1b of this modification example.

[0038] The antenna device 1 of the above-described embodiment was configured such that the patch antenna 2 receives the received radio waves of right-handed circular polarization. The antenna device 1b of this modification example is configured such that the patch antenna receives the received radio waves of left-handed circular polarization.

[0039] As shown in FIG. 4, the antenna device 1b of this modification example includes a patch antenna 2b, a top cover 3, and a bracket 4. Here, the same components as those of the antenna device 1 of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0040] The antenna device 1b is an antenna device for receiving left-handed circular polarization. The radio waves of left-handed circular polarization are, for example, the radio waves of SXM (Sirius XM Radio).

[0041] The patch antenna 2b includes a radiation conductor 21b, an antenna substrate 22, two feeding portions (not shown), and a ground conductor 24b. The radiation conductor 21a is an electrode of a conductor such as a silver foil formed on the lower surface of the antenna substrate 22. The two feeding portions are two feeding points electrically connected to the radiation conductor 21b. The ground conductor 24b is an electrode of a metal conductor such as a silver foil formed on the upper surface of the antenna substrate 22 and facing the radiation conductor 21b and grounded.

[0042] The patch antenna 2b is a patch antenna for receiving right-handed circularly polarized waves, and functions as an antenna that radiates radio waves of the right-handed circularly polarized wave R3 in the vertical direction (-Z direction) of the radiating conductor 21b. Further, the bracket 4 functions as a reflector that reflects radio waves.

[0043] Therefore, the right-handed circularly polarized wave R3 radiated from the patch antenna 2b is reflected by the bracket 4 and radiated in the +Z direction as a left-handed circularly polarized wave L3. That is, the received radio wave of the left-handed circularly polarized wave radiated from the SXM satellite in the -Z direction is reflected by the bracket 4 as a right-handed circularly polarized wave in the +Z direction, and the patch antenna 2b receives the received radio wave of the right-handed circularly polarized wave with the radiating conductor 21b.

[0044] The patch antenna 2b only needs to perform the above-described right-handed circularly polarized wave reception operation, and the shapes of the radiating conductor 21 and the ground conductor 24 do not matter. For this reason, similar to the patch antenna 2 of the above-described embodiment, the patch antenna 2b has the radiating conductor 21b formed on the back surface, so that it is not necessary to provide a cover or the like, and the number of components can be reduced.

[0045] As described above, according to this modification example, the received radio wave is a left-handed circularly polarized wave. Therefore, the received radio wave of the left-handed circularly polarized wave such as SXM broadcast can be surely received.

[0046] (Third modification example) Referring to FIG. 5, a third modification example of the above-described embodiment will be described. FIG. 5 is a schematic cross-sectional view showing the antenna device 1c of this modification example.

[0047] The antenna device 1 of the above-described embodiment has a configuration in which the patch antenna 2 reflects and receives the received radio wave of the right-handed circularly polarized wave with the bracket 4. The antenna device 1c of this modification example has a configuration in which the patch antenna reflects and receives the received radio wave of the right-handed circularly polarized wave with a reflection element.

[0048] As shown in FIG. 5, the antenna device 1c of this modification example includes a patch antenna 2, a top cover 3, a bracket 4, and a reflection element 5. Here, the same components as those of the antenna device 1 of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0049] The antenna device 1c is an antenna device for receiving right-handed circularly polarized waves. The reflecting element 5 is an element that reflects radio waves, such as a circuit board such as a PCB (Printed Circuit Board) or a metal plate, provided in the internal space of the top cover 3 and the bracket 4. When the reflecting element 5 is a circuit board, a conductor such as a copper foil on the circuit board functions as a portion that reflects radio waves.

[0050] The left-handed circularly polarized wave L1 radiated from the patch antenna 2 is reflected by the reflecting element 5 and radiated in the +Z direction as a right-handed circularly polarized wave R1. That is, the received radio wave of the right-handed circularly polarized wave radiated from the GNSS satellite in the -Z direction is reflected by the reflecting element 5 in the +Z direction as a left-handed circularly polarized wave, and the patch antenna 2 receives the received radio wave of the left-handed circularly polarized wave with the radiating conductor 21.

[0051] As described above, according to this modification example, the antenna device 1c is provided on the first surface side where the radiating conductor is provided, reflects the polarization direction of the circularly polarized wave of the radio wave in the reverse direction, and includes a reflecting element 5 disposed inside the top cover 3. Therefore, without providing a cover or a protective seal for the radiating conductor 21 when the radiating conductor 21 is provided on the zenith direction side, the number of components can be reduced, and the antenna device 1c can be lightened.

[0052] (Fourth Modification Example) Referring to FIG. 6, a fourth modification example of the above-described embodiment will be described. FIG. 6 is a schematic cross-sectional view showing the antenna device 1d of this modification example.

[0053] The antenna device 1 of the above-described embodiment has a configuration including the patch antenna 2. The antenna device 1d of this modification example has a configuration including two patch antennas.

[0054] As shown in FIG. 6, the antenna device 1d of this modification example includes a patch antenna 2, a top cover 3, a bracket 4, an insulator 6, and a patch antenna 7. Here, the same components as those of the antenna device 1 of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0055] The antenna device 1d is an antenna device for receiving two types of right-handed circularly polarized waves. The patch antenna 7 is a patch antenna for receiving left-handed circularly polarized waves, and is assumed to receive left-handed circularly polarized waves of a wireless communication system or frequency band different from the left-handed circularly polarized waves of GNSS received by the patch antenna 2.

[0056] The insulator 6 is an insulator provided between the patch antenna 2 and the patch antenna 7. The patch antenna 7 includes a radiating conductor 71, an antenna substrate 72, two feeding portions (not shown), and a ground conductor 74.

[0057] The radiating conductor 71 is an electrode of a conductor such as silver foil formed on the upper surface of the insulator 6 and the lower surface of the antenna substrate 72. The antenna substrate 72 is a plate formed of a resin such as a PPE material or a PC material as a dielectric having a predetermined relative dielectric constant, similar to the antenna substrate 22. The two feeding portions are two feeding points electrically connected to the radiating conductor 71. The ground conductor 74 is an electrode of a metal conductor such as silver foil formed on the upper surface of the antenna substrate 72 and at a position facing the radiating conductor 71 and grounded.

[0058] Also, for the patch antenna 2, the dimensions, positions, and shapes of the radiating conductor 21, the antenna substrate 22, the feeding portions 23A and 23B, and the ground conductor 24 are designed to resonate with the GPS L2 band and the GPS L5 band or the QZSS L6 band. For the patch antenna 7, the dimensions, positions, and shapes of the radiating conductor 71, the antenna substrate 72, the feeding portion, and the ground conductor 74 are designed to resonate with the GPS L1 band. The GPS L2 band, L5 band, and QZSS L6 band have lower frequencies than the GPS L1 band. Therefore, for example, the dimensions of the radiating conductor 21, the antenna substrate 22, and the ground conductor 24 of the patch antenna 2 are set larger than the dimensions of the radiating conductor 71, the antenna substrate 72, and the ground conductor 74 of the patch antenna 7.

[0059] The left-handed circularly polarized wave L1 radiated from the patch antenna 2 is reflected by the bracket 4 and radiated in the +Z direction as a right-handed circularly polarized wave R1. That is, the received radio wave of the right-handed circularly polarized wave radiated from the GNSS satellite in the -Z direction is reflected by the bracket 4 as a left-handed circularly polarized wave in the +Z direction, and the patch antenna 2 receives the received radio wave of the left-handed circularly polarized wave with the radiating conductor 21.

[0060] Furthermore, the left-handed circularly polarized wave L5 radiated from the patch antenna 7 is reflected by the bracket 4 and radiated in the +Z direction as a right-handed circularly polarized wave R5. That is, the received radio wave of the right-handed circularly polarized wave radiated from the GNSS satellite in the -Z direction is reflected by the bracket 4 as a left-handed circularly polarized wave in the +Z direction, and the patch antenna 7 receives the received radio wave of the left-handed circularly polarized wave with the radiating conductor 71.

[0061] As described above, according to this modification example, the antenna device 1d includes the patch antenna 7 as a second antenna provided on the opposite side of the first surface side of the radiating conductor 21 of the patch antenna 2. Therefore, the patch antenna 2 can be configured in common with the top cover 3, the patch antenna 7 can be newly provided, and the antenna device 1d having the patch antenna 2 can be lightened.

[0062] Also, the frequency bands of the patch antennas 2 and 7 are different. Therefore, the antenna device 1d can receive wideband radio waves (GPS L1 band, L2 band, and L5 band or QZSS L6 band) with different frequency bands.

[0063] Note that the descriptions in the above embodiments and modification examples are examples of the antenna device according to the present invention and are not limited thereto. For example, a configuration in which at least two of the above embodiments and modification examples are appropriately combined may be used.

[0064] For example, the configurations of the second modification and the fourth modification may be combined. More specifically, in the antenna device 1d of the fourth modification, both the patch antennas 2 and 7 may be configured to radiate in the +z direction (receive radio waves from the +z direction) as in the second modification. In this way, regardless of whether the radio waves are reflected by the bracket 4 or the reflecting element 5, the radiation direction and reception polarization are not limited as long as they match the type of antenna to be received.

[0065] In the above-described embodiments and modifications, the frequency band of the antenna devices 1, 1a, 1b, 1c, 1d is configured to be the frequency band of GNSS. However, the present invention is not limited to this, and other frequency bands of wireless communication systems may be used.

[0066] In the above-described embodiments and modifications, the antenna devices 1, 1a, 1b, 1c, 1d are patch antennas having a single-layer antenna substrate 22 with two-point power feeding by the power feeding units 23A and 23B. However, the present invention is not limited to this. For example, the antenna devices 1, 1b may be patch antennas with single-point power feeding. The antenna devices 1, 1b may also be patch antennas having a multi-layer antenna substrate.

[0067] In the above-described embodiments and modifications, the antenna devices 1, 1a, 1b, 1c, 1d are antenna devices provided inside the IP. However, the present invention is not limited to this. For example, the antenna devices 1, 1a, 1b, 1c, 1d may be configured to be stored inside a shark fin antenna, or the antenna devices 1, 1a, 1b, 1c, 1d themselves may be provided on the roof of a vehicle or the like.

[0068] In addition, in the fourth modification example described above, the antenna device 1d is configured such that the patch antenna 7 is provided on the zenith direction side (+Z direction side) of the patch antenna 2. However, the present invention is not limited to this configuration. The antenna device 1d may be configured such that the patch antenna 7 is provided on the nadir direction side (-Z direction side) of the patch antenna 2. According to this configuration, a new patch antenna 7 can be provided, and the antenna device 1d having the patch antenna 2 can be reduced in weight and size (low profile).

[0069] In addition, the detailed configurations and detailed operations of the antenna devices 1, 1a, 1b, 1c, and 1d in the above embodiments can be appropriately changed without departing from the spirit of the present invention.

Explanation of Reference Numerals

[0070] 1, 1a, 1b, 1c, 1d Antenna device 2, 2a, 2b, 7 Patch antenna 21, 21a, 21b, 71 Radiation conductor 22, 72 Antenna substrate 23A, 23B Feeding unit 24, 24a, 24b, 74 Ground conductor 3 Top cover 4 Bracket 5 Reflector 6 Insulator

Claims

1. A cover made of resin having a predetermined dielectric constant, a first antenna including a radiation conductor provided on one first surface of the cover and powered, and a substrate that is a part of the cover.

2. The first antenna The antenna device according to claim 1, further comprising a ground conductor provided on a second surface facing the radiation conductor through the cover.

3. The first surface is a surface on the opposite side of the top surface of the cover, a reflector provided on the first surface side, reflecting the polarization direction of the circularly polarized radio wave in the opposite direction, and supporting the cover, The antenna device according to claim 1, wherein the first antenna receives the received radio wave reflected by the reflector.

4. The first surface is a surface on the opposite side of the top surface of the cover, a reflection element provided on the first surface side, reflecting the polarization direction of the circularly polarized radio wave in the opposite direction, and disposed inside the cover, The antenna device according to claim 1, wherein the first antenna receives the received radio wave reflected by the reflection element.

5. The first surface is the top surface of the cover, The antenna device according to claim 1, wherein the first antenna directly receives the received radio wave.

6. The received radio wave is a right-handed circularly polarized wave or a left-handed circularly polarized wave. The antenna device according to any one of claims 3 to 5.

7. The antenna device according to claim 1, further comprising a second antenna provided on the first surface side or the opposite side of the first surface of the first antenna.

8. The antenna device according to claim 7, wherein the frequency bands of the first antenna and the second antenna are different.

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