WO2022181295A1 - アンテナ装置 - Google Patents
アンテナ装置 Download PDFInfo
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- WO2022181295A1 WO2022181295A1 PCT/JP2022/004480 JP2022004480W WO2022181295A1 WO 2022181295 A1 WO2022181295 A1 WO 2022181295A1 JP 2022004480 W JP2022004480 W JP 2022004480W WO 2022181295 A1 WO2022181295 A1 WO 2022181295A1
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- antenna device
- antenna
- slots
- slot
- gain
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- 238000004891 communication Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/005—Patch antenna using one or more coplanar parasitic elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
Definitions
- the present invention relates to an antenna device.
- Patent Document 1 discloses an antenna device including a patch antenna.
- the directivity of the antenna device may deteriorate due to a decrease in the gain of the patch antenna at high elevation angles.
- An example of the purpose of the present invention is to improve the directivity of an antenna device.
- Other objects of the present invention will become clear from the description herein.
- One aspect of the present invention is an antenna device having an antenna having a radiation element capable of receiving a signal in a predetermined frequency band, and a metal part having at least one parasitic slot provided around the antenna. be.
- the directivity of the antenna device is improved.
- FIG. 1 is a perspective view of an antenna device 10;
- FIG. 2 is a plan view of the antenna device 10;
- FIG. 3 is a perspective view of a patch antenna 30;
- FIG. 3 is a cross-sectional view of patch antenna 30.
- FIG. 4 is a diagram for explaining a theoretical circle C on the front surface of the main plate 20;
- FIG. 3 is a diagram showing the relationship between elevation angles and gains of the antenna device A and the antenna device 10.
- FIG. It is a figure which shows the relationship between length L and an average gain.
- FIG. 10 is a diagram showing the relationship between the elevation angle and the gain when the length L is changed; It is a figure which shows the relationship between the distance D and an average gain.
- FIG. 10 is a diagram showing the relationship between the elevation angle and the gain when the distance D is changed;
- 2 is a plan view of the antenna device 100;
- FIG. 2 is a plan view of the antenna device 101;
- FIG. 2 is a plan view of the antenna device 102;
- FIG. 2 is a diagram showing the relationship between elevation angle and gain of antenna device X and antenna devices 100 to 102;
- 2 is a plan view of the antenna device 110;
- FIG. 2 is a plan view of the antenna device 111;
- FIG. 3 is a plan view of the antenna device 112;
- FIG. 3 is a plan view of the antenna device 113;
- FIG. 2 is a plan view of an antenna device 114;
- FIG. 3 is a diagram showing relationships between elevation angles and gains of antenna device A, antenna devices 111 to 112, and antenna device 114.
- FIG. 2 is a plan view of the antenna device 200;
- FIG. 4 is a diagram showing the relationship between the frequency and gain of antenna device B;
- FIG. 4 is a diagram showing the relationship between the frequency and gain of the antenna device 200a;
- FIG. 4 is a diagram showing the relationship between elevation angles and gains of antenna device B and antenna device 200a.
- FIG. 4 is a diagram showing the relationship between the frequency and gain of the antenna device 200b;
- FIG. 4 is a diagram showing the relationship between elevation angles and gains of antenna device B and antenna device 200b.
- FIG. 4 is a diagram showing the relationship between the frequency and gain of the antenna device 200c;
- FIG. 4 is a diagram showing the relationship between elevation angles and gains of antenna device B and antenna device 200c.
- FIG. 4 is a diagram showing the relationship between the elevation angle and gain of the antenna device 200c;
- FIG. 1 is a perspective view of the antenna device 10
- FIG. 2 is a plan view of the antenna device 10.
- FIG. 3 is a perspective view of the patch antenna 30.
- FIG. 1 For the sake of convenience, only the patch antenna 30 of the antenna device 10 is shown in FIG. 2, and a part of the configuration (such as a pedestal supporting the patch antenna 30, which will be described later) is omitted.
- the X direction is the direction along the line connecting the center point 35p of the radiation element 35 of the patch antenna 30, which will be described later, and the feed point 43a.
- the horizontal direction perpendicular to the X direction is the Y direction
- the vertical direction perpendicular to the X direction and the Y direction is the Z direction.
- the antenna device 10 is an in-vehicle antenna device mounted on a vehicle (not shown), and includes a base plate 20 and a patch antenna 30 .
- An in-vehicle antenna device is housed, for example, in a cavity between a roof panel of a vehicle and a roof lining on the ceiling surface of the vehicle interior.
- the ground plate 20 is a quadrilateral metal plate used as a ground for the patch antenna 30, and is installed, for example, on the roof lining of a vehicle (not shown).
- the ground plane 20 has four parasitic slots 25 - 28 formed around the patch antenna 30 . Details of the slots 25 to 28 will be described later.
- the base plate 20 is assumed to be quadrilateral, it is not limited to this, and may be a circular or elliptical plate-like member, for example.
- the base plate 20 may have a shape other than a plate shape as long as it is a metal member that functions as a ground.
- the patch antenna 30 is, for example, an antenna used for a satellite digital audio radio service (SDARS) system, and receives left-hand circularly polarized waves (satellite signals) in the 2.3 GHz band. Also, the patch antenna 30 is provided near the center of the base plate 20 .
- SDARS satellite digital audio radio service
- the communication standards and frequency bands that can be received by the patch antenna 30 are not limited to those described above, and other communication standards and frequency bands may be used.
- FIG. 4 is a cross-sectional view of the patch antenna 30 taken along line AA in FIG.
- the oblique lines shown in FIG. 4 are provided for convenience in order to make the conductive patterns 31 and 33, the circuit board 32, the dielectric member 34, the radiation element 35, and the shield cover 40, which will be described later, easier to understand.
- the patch antenna 30 comprises a circuit board 32 on which conductive patterns 31 and 33 (details of which will be described later) are formed, a dielectric member 34, a radiation element 35, and a shield cover 40.
- the circuit board 32 is a dielectric plate having conductive patterns 31 and 33 formed on its back surface (the surface in the negative direction of the Z axis) and the front surface (the surface in the positive direction of the Z axis). It is made of glass epoxy resin, for example.
- the pattern 31 includes a circuit pattern 31a and a ground pattern 31b.
- the circuit pattern 31a is, for example, a conductive pattern to which the signal line 45a of the coaxial cable 45 from the amplifier board (not shown) is connected.
- a braid 45b of the coaxial cable 45 is electrically connected to the ground pattern 31b by solder 45c.
- a configuration for connecting the circuit pattern 31a and the radiation element 35 will be described later.
- the ground pattern 31b is a conductive pattern for grounding the patch antenna 30.
- the ground pattern 31b and the four pedestals 21 provided on the metal base plate 20 are electrically connected.
- each of the four pedestals 21 is formed by bending a part of the base plate 20 so as to support the patch antenna 30 .
- the ground pattern 31b is grounded by electrically connecting the ground pattern 31b and the pedestal portion 21 .
- a metal shield cover 40 for shielding the circuit pattern 31a is attached to the back surface of the circuit board 32, for example.
- the pattern 33 formed on the front surface of the circuit board 32 is a ground pattern that functions as a ground for the ground conductor plate (or ground conductor film) of the patch antenna 30 and the circuit (not shown).
- the pattern 33 is electrically connected to the ground pattern 31b through through holes.
- the ground pattern 31 b is electrically connected to the ground plane 20 via the fixing screws for fixing the circuit board 32 to the base portion 21 and the base portion 21 . Therefore, pattern 33 is electrically connected to ground plane 20 .
- the dielectric member 34 is a substantially rectangular plate-shaped member having sides parallel to the X-axis and sides parallel to the Y-axis.
- the front surface and the back surface of the dielectric member 34 are parallel to the X-axis and the Y-axis, the front surface of the dielectric member 34 is oriented in the Z-axis positive direction, and the back surface of the dielectric member 34 is parallel to the X-axis and the Y-axis.
- the surface is oriented in the Z-axis negative direction.
- the back surface of the dielectric member 34 is attached to the pattern 33 by, for example, double-sided tape.
- the dielectric member 34 is made of a dielectric material such as ceramic.
- the radiating element 35 is a substantially rectangular conductive element having an area smaller than that of the front surface of the dielectric member 34 and is formed on the front surface of the dielectric member 34 .
- the normal direction of the radiation surface of the radiation element 35 is the positive direction of the Z-axis.
- the radiation element 35 also has sides 35a and 35c parallel to the Y-axis and sides 35b and 35d parallel to the X-axis.
- substantially quadrilateral refers to a shape consisting of four sides, including squares and rectangles, for example.
- a notch (concave portion) or protrusion (convex portion) may be provided on a part of the sides.
- the radiating element 35 is “substantially quadrilateral”, but is not limited to this, and may be, for example, a circle, an ellipse, or a polygon other than a substantially quadrilateral. In other words, the radiating element 35 may have any shape as long as it can receive signals (radio waves) in a desired frequency band.
- the through hole 41 penetrates the circuit board 32, the pattern 33, and the dielectric member 34.
- a feeder line 42 is provided to connect the circuit pattern 31a and the radiation element 35. As shown in FIG.
- the feeder line 42 connects the circuit pattern 31a and the radiation element 35 while being electrically insulated from the grounded pattern 33 . Further, in the present embodiment, the point at which the feed line 42 is electrically connected to the radiating element 35 is the feed point 43a.
- the feeding point 43a is provided at a position shifted in the positive direction of the X-axis from the center point 35p of the radiation element 35, as shown in FIG.
- the position of the feeding point 43a is not limited to this, and the feeding point 43a may be provided, for example, at a position shifted from the center point 35p of the radiation element 35 in the positive direction of the X-axis and the negative direction of the Y-axis.
- the "center point 35p of the radiating element 35" refers to the center point of the outer edge shape of the radiating element 35, that is, the geometric center.
- the one-feed system radiation element 35 shown in FIG. 3 has, for example, a substantially rectangular shape with different vertical and horizontal lengths so that desired circularly polarized waves can be transmitted and received.
- the patch antenna 30 is designed such that the center point 35p coincides with the center of the patch antenna 30 on the XY plane.
- the “center of the patch antenna 30” is, for example, the geometric center of the patch antenna 30 excluding the pedestal 21 in a plan view of the XY plane when the patch antenna 30 is viewed from the Z-axis positive direction.
- substantially rectangular is a shape included in the above-described “substantially quadrilateral”. Therefore, the “central point 35p of the radiating element 35” is the point where the diagonal lines of the radiating element 35 intersect.
- the “substantially rectangular” is a shape included in the above-described “substantially quadrilateral”.
- the configuration in which only one feeder line 42 is connected to the radiating element 35 has been described.
- a 2-feed system or a 4-feed system may be adopted.
- the additional power supply line can be provided through a through hole (not shown) penetrating the dielectric member 34 and the like, similarly to the power supply line 42, so detailed description of the configuration is omitted here.
- the feeding point to be added is provided at a position displaced from the center point 35p of the radiation element 35 in the positive/negative direction of the X-axis or the positive/negative direction of the Y-axis, similarly to the feeding point 43a.
- feeding points are provided at a position shifted from the center point 35p in the positive direction of the X-axis and at a position shifted from the center point 35p in the negative direction of the Y-axis.
- feeding points are provided at positions shifted from the center point 35p in the positive and negative directions of the X-axis and at positions shifted from the center point 35p in the positive and negative directions of the Y-axis.
- the distances to the center point 35p of the feeding points provided at positions shifted from the center point 35p are the same.
- the radiating element 35 has, for example, a substantially square shape with equal vertical and horizontal lengths so that desired circularly polarized waves can be transmitted and received.
- the “substantially square” is a shape included in the above-described “substantially quadrilateral”.
- the slots 25 in FIGS. 1 and 2 are parasitic openings (or holes) formed in the ground plane 20 to radiate (or reflect) radio waves in a desired frequency band received by the patch antenna 30.
- the slot 25 of this embodiment has a quadrilateral shape having a length L in the longitudinal direction and a length W in the lateral direction according to the wavelength used in the desired frequency band.
- the “used wavelength (wavelength of desired frequency band)” is a wavelength corresponding to a desired frequency of a desired frequency band in which the patch antenna 30 is used.
- a wavelength corresponding to a frequency is a wavelength corresponding to a desired frequency of a desired frequency band in which the patch antenna 30 is used.
- the patch antenna 30 is an antenna used in a satellite digital audio radio service system
- the center frequency is approximately 2.3 GHz. Therefore, the wavelength used is a wavelength corresponding to approximately 2.3 GHz.
- the slot 25 has a length L of approximately one-half ( ⁇ /2) of the wavelength used and a length W is a length sufficiently shorter than the length L.
- each of the slots 26 to 28 is a quadrilateral opening like the slot 25, detailed description thereof will be omitted here.
- each of the slots 25 to 28 has a quadrilateral shape with a length L and a length W, but it is not limited to this.
- the slots 25 to 28 may be substantially quadrilateral, polygons other than quadrilaterals, circles, ellipses, or crosses, as long as they can radiate radio waves in a desired frequency band.
- each of the slots 25 to 28 is centered on the front surface of the ground plane 20 corresponding to the center point 35p of the radiating element 35, and has a radius of a distance D. It is provided at equal intervals on the circumference of a theoretical circle (hereinafter referred to as circle C). Note that the distance D in this embodiment is, for example, the length of 1/2 ( ⁇ /2) of the wavelength used.
- “Around the patch antenna" in which the slot is arranged is, for example, an area in the area around the patch antenna 30 in which the directivity of the patch antenna 30 is improved by providing the slot.
- the direction of rotation of the left-handed circularly polarized wave received by the radiation element 35 is indicated by an arrow S for reference.
- the slot 25 is arranged so that the midpoint of the side on the radiating element 35 side of the two sides in the longitudinal direction touches the point P1 on the circumference of the circle C in the positive direction of the X axis and the negative direction of the Y axis. is provided in The slot 26 is in contact with a point P2 on the circumference of the circle C in the positive direction of the X-axis and the positive direction of the Y-axis, and the slot 27 is in contact with the circumference of the circle C in the negative direction of the X-axis and the positive direction of the Y-axis. is provided so as to be in contact with the point P3 of . Furthermore, the slot 28 is provided so as to contact a point P4 on the circumference of the circle C in the negative direction of the X-axis and the negative direction of the Y-axis.
- the points P1 to P4 are located on the circumference of the circle C at regular intervals (every 90°). Therefore, each of the slots 25 to 28 is also provided on the circumference of the circle C at every 90°.
- the four slots are arranged at intervals of 90 degrees (equally spaced), but the present invention is not limited to this, and the angles between the slots may be different.
- the longitudinal directions of the slots 25-28 are parallel to the tangents of the points P1-P4 of the circle C. Therefore, the longitudinal direction of each of the slots 25 to 28 is the same as the turning direction of the circularly polarized waves received by the patch antenna 30 . That is, the slots 25 to 28 are arranged along the rotating direction of the circularly polarized wave.
- the radio waves received by the patch antenna 30 are left-handed circularly polarized waves. It will be placed.
- the gains of the antenna device 10 and the antenna device of the comparative example were calculated under predetermined conditions (hereinafter referred to as "predetermined conditions").
- the antenna device A (not shown) is the antenna device 10 in which the slots 25 to 28 are not provided. Further, in the simulation of the antenna device 10 and the antenna device A, for the sake of convenience, models are used in which the circuit pattern 31a and the like, which have a small influence on the gain, are omitted.
- the length W of the slots 25-28 is 5 mm.
- distances and lengths are expressed using “substantially” such as approximately half the wavelength ⁇ used, but this is because the wavelength ⁇ used is not always divisible by an integer, This is because the actual electrical length of the slot formed in the ground plane 20 changes due to various factors such as the patch antenna 30 . Therefore, in the present embodiment, when distances and lengths are indicated using “substantially”, they include values that deviate from accurate values by a predetermined value (for example, a value of 1/32 of the wavelength ⁇ used). do.
- the "predetermined value” is a value that is 1/32 of the working wavelength ⁇ , but it is a value that varies depending on the ground plane 20, the patch antenna 30, etc. that constitute the antenna device 10, and is therefore limited to this value. do not have.
- FIG. 6 is a diagram showing the relationship between the elevation angle (horizontal axis) and the average gain (vertical axis) in each of the antenna device A and the antenna device 10.
- the elevation angle the zenith angle is 0° and the horizontal angle is 90°.
- the calculation result of the antenna device A is indicated by a dotted line
- the calculation result of the antenna device 10 is indicated by a solid line.
- the ⁇ mark on the dotted line and the ⁇ mark on the solid line indicate the position of the numerical value on the vertical axis with respect to the numerical value on the horizontal axis. 8, 10, 14, 20, 24, 26, 28, and 29, which will be described later, are the same. .
- high elevation angle refers to an elevation angle range of 0° to 30°
- intermediate elevation angle refers to an elevation angle range of 30° to 60°
- low elevation angle means, for example, a range of elevation angles of 60° to 90°.
- the gain of the antenna device A gradually decreases from an elevation angle of 0° (4.3 dBic), and decreases to 2.3 dBic at an elevation angle of 30°. After that, the gain of the antenna device A increases as the elevation angle increases, reaches 2.7 dBic at an elevation angle of 50°, and then decreases again. Therefore, the antenna device A has directivity in which the gain deteriorates at a high elevation angle (for example, 30°).
- the gain of the antenna device 10 gradually decreases as the elevation angle increases from the zenith direction (5.7 dBic) at an elevation angle of 0°, and does not include points where the gain increases.
- the average gain of the antenna device A from elevation angles of 0° to 60° is approximately 3.0 ( ⁇ 2.99) dB
- the average gain of the antenna device 10 from elevation angles of 0° to 60° is approximately 3.8 dB, which is 0.8 dB larger. Therefore, the antenna device 10, for example, as an antenna device for receiving radio waves transmitted from a satellite, has an improved average gain at high and medium elevation angles and has ideal directivity.
- the patch antenna 30 can efficiently receive incoming radio waves from, for example, satellites.
- FIG. 7 is a diagram showing the relationship between the average gain (dB) for elevation angles of 0° to 60° in the antenna device 10a and the length L of the slots 25-28. As shown in FIG. 7, when the length L reaches 44 mm, 49 mm, and approximately 3/8 of the wavelength used (3 ⁇ /8), the average gain of the antenna device 10 at elevation angles of 0° to 60° is slightly smaller than the average gain (approximately 3.0 dB) without slots.
- the average gain of the antenna device 10 from elevation angles of 0° to 60° is 3.1 dB. It becomes larger than the average gain (approximately 3.0 dB).
- the average gain of the antenna device 10 from elevation angles of 0° to 60° reaches a peak value (3.65 dB), and the length L is 64 mm. , the average gain gradually decreases. However, even if the length is increased to, for example, 94 mm (approximately four-thirds of the wavelength used), the average gain of the antenna device 10 from elevation angles of 0° to 60° is 3.3 dB. (approximately 3.0 dB).
- the result of "no slot” is the same as the result of the antenna device A in FIG. 6 described above.
- FIG. 9 is a diagram showing the relationship between the average gain (dB) for elevation angles of 0° to 60° in the antenna device 10b and the distance D between the slots 25-28.
- the distance D is changed in increments of 5 mm from 34 mm (approximately a quarter of the wavelength used) to 94 mm (approximately three-quarters of the wavelength used).
- the average gain for elevation angles from 0° to 60° is 3.03 dB, which is larger than the average gain (2.99 dB) without slots. Then, when the distance D is 49 mm (approximately three-eighths of the wavelength used), the average gain is 3.95 dB at elevation angles from 0° to 60°, which is the highest. After that, when the distance D is gradually increased from 49 mm, the average gain gradually decreases from 0° to 60° of elevation angle.
- the average gain at the elevation angle of 0° to 60° when the distance D is 94 mm is 3.52 dB, which is higher than the average gain (2.99 dB) when there is no slot. value.
- the result of "no slot” is the same as the result of the antenna device A in FIG. 6 described above.
- the change in arrangement means, for example, changing the distance D for every four slots, or rotating the positions of the four slots while maintaining the distance D. including.
- FIG. 11 is a plan view of the antenna device 100 in which the distances D of the slots 25-28 are varied.
- the distance D1 from the center point 35p to the slot 25 is set to 74 mm
- the distance D2 to the slot 26 is set to 64 mm.
- the distance D3 from the center point 35p to the slot 27 is set to 94 mm
- the distance D4 to the slot 28 is set to 84 mm.
- FIG. 12 is a plan view of the antenna device 101 in which the respective distances D of the slots 25-28 are changed as in FIG.
- the distances D1 and D3 are interchanged from the layout of FIG. Specifically, in the antenna device 101, the distance D1 is set to 94 mm, and the distance D3 is set to 74 mm.
- the distances D2 and D4 are 64 mm and 84 mm, respectively.
- FIG. 13 is a plan view of the antenna device 102 in which four slots are arranged such that the longitudinal direction of the slots is parallel to each side of the radiating element 35.
- the slot 25 is provided so that the center of the longitudinal side of the slot 25 is located at a distance D from the center point 35p of the radiating element 35 in the positive direction of the X axis. Further, the slots 26 to 28 are similar to the slot 25. FIG.
- the slot 26 is provided at a position separated by a distance D in the positive direction of the Y-axis from the center point 35p
- the slot 27 is provided at a position separated by a distance D in the negative direction of the X-axis from the center point 35p
- the slot 28 is provided at a position separated by a distance D in the Y-axis negative direction from the center point 35p.
- the calculation results of the average gains for the elevation angles of 0° to 60° for the antenna devices 100 to 102 are 3.63 dB, 3.72 dB, and 3.67 dB. Greater than average gain (2.99 dB) up to ⁇ 60°.
- FIG. 14 is a diagram showing the relationship between the elevation angle (horizontal axis) and the gain (vertical axis) for each of the slotless (antenna apparatus A) and the antenna apparatuses 100-102.
- the dotted line is the waveform without a slot (antenna device A)
- the solid, one-dot chain, and two-dot chain lines are the waveforms of the antenna devices 100 to 102, respectively.
- the gain of each of the antenna devices 100-102 is greater than the gain of the antenna device A at high elevation angles.
- the gain of each of the antenna devices 100 to 102 gradually decreases as the elevation angle increases from the zenith angle. Therefore, even when using the antenna devices 100 to 102 in which the placement of the slots 25 to 28 is changed, the average gain of the antenna devices 100 to 102 at high and medium elevation angles can be improved, and ideal directivity can be obtained. .
- FIG. 15 is a plan view of the antenna device 110 having one slot.
- the antenna device 110 is provided with only the slot 26 out of the slots 25-28.
- 16-18 are plan views of antenna devices 111-113 having two slots.
- the antenna device 111 of FIG. 16 is provided with slots 25 and 26 that are adjacent in the positive direction of the X-axis among the slots 25-28.
- the antenna device 112 of FIG. 17 is provided with slots 26 and 27, which are adjacent to each other in the positive direction of the Y-axis, among the slots 25-28.
- the slots 26 and 28 are provided so as to face each other with the center point 35p of the radiating element 35 therebetween.
- FIG. 19 is a plan view of an antenna device 114 having three slots.
- the antenna device 114 is provided with three slots 26-28 out of the slots 25-28.
- the table below shows the relationship between the number of slots and the calculation results of the average gain for elevation angles of the antenna device from 0° to 60°.
- the average gain of the antenna device having at least one slot is larger than the average gain of the antenna device having no slot (antenna device A) from elevation angles of 0° to 60°.
- FIG. 20 is a diagram showing the relationship between the elevation angle (horizontal axis) and the gain (vertical axis) for each of the antenna devices 110, 111, and 114 without slots.
- the dotted line is the waveform without slots (antenna device A), and the solid, one-dot chain, and two-dot chain lines are the waveforms of the antenna devices 110, 111, and 114, respectively.
- the antenna device 111 is shown among the antenna devices 111 to 113 having two slots.
- the gain of each of the antenna devices 110, 111, 114 is greater than the gain of the antenna device A at high elevation angles.
- the gain of each of the antenna devices 110, 111, 114 gradually decreases as the elevation angle increases from the zenith angle. Therefore, by providing at least one slot around the patch antenna 30 of the antenna device, the average gain of the antenna device at high and medium elevation angles is improved, and directivity can be improved.
- FIG. 21 is a plan view of an antenna device 200 that receives radio waves of two frequency bands.
- the antenna device 200 includes a circular ground plane 300 and a patch antenna 400 .
- the base plate 300 is a circular metal plate with a diameter of 1 m.
- a patch antenna 400 is provided substantially in the center of the ground plane 300, and slots 310 to 313 are provided around the patch antenna 400.
- the slots 310 to 313 are, like the slot 25, rectangular openings (holes) having a length L in the longitudinal direction and a length W in the lateral direction. Details of the slots 310 to 313 will be described later.
- the patch antenna 400 is, for example, an antenna that receives radio waves in the 1.2 GHz and 1.6 GHz frequency bands used for GNSS (Global Navigation Satellite System).
- the patch antenna 400 for GNSS can use patch antennas with various configurations, such as a general one-stage patch antenna, a laminated two-stage patch antenna, and a patch antenna using sheet metal. A detailed description of the configuration of patch antenna 400 is omitted.
- the patch antenna 400 is attached to the ground plane 300 using a configuration similar to that in which the patch antenna 30 is attached to the ground plane 20 .
- the slot 310 is formed at a position separated by a distance D10 in the positive direction of the X-axis from the center point 410p of the substantially quadrilateral radiation element 410 .
- the slot 310 is arranged such that the midpoint of the two longitudinal sides of the slot 310 on the radiating element 410 side is on the axis extending in the positive direction of the X-axis from the center point 410p. It is provided on the base plate 300 .
- the patch antenna 400 is designed such that the center point 410p coincides with the center of the patch antenna 400 on the XY plane. Therefore, "the center of the patch antenna 400" is also the center point 410p.
- the slots 311 to 313 are formed in the base plate 300 in the same way as the slot 310. Specifically, the slot 311 is located at a distance D11 in the positive Y-axis direction from the center point 410p of the radiating element 410, and the slot 312 is located at a distance D11 from the center point 410p of the radiating element 410 in the negative X-axis direction. is provided at a position separated by a distance D12. Further, the slot 313 is provided at a position separated from the center point 410p of the radiating element 410 by a distance D13 in the Y-axis negative direction.
- the antenna device 200 like the antenna device 10, for example, by adjusting the length L of the slots 310 to 313 and the distances D10 to 13, the radio waves received by the patch antenna 400 are adjusted. Directivity can be improved.
- FIG. 22 is a diagram showing the relationship between frequency and gain in antenna device B.
- the gain of the antenna device B is large near 1.2 GHz and near 1.6 GHz. Therefore, by using such an antenna device B, radio waves in two frequency bands (1.2 GHz band and 1.6 GHz band) for GNSS can be received.
- the frequency of the 1.2 GHz band will be referred to as the "first frequency band” and the frequency of the 1.6 GHz band will be referred to as the "second frequency band”.
- the antenna device 200a is one form of the antenna device 200 that can increase the gain of radio waves in the first frequency band.
- the length L of each of the slots 310 to 313 is approximately half the working wavelength of the first frequency band, and the length W is sufficiently shorter than the length L.
- the working wavelength of the first frequency band is, for example, a wavelength corresponding to the center frequency of the first frequency band (for example, approximately 1246 MHz). Therefore, since the wavelength ⁇ used here is approximately 240 mm, the length L is approximately 120 mm.
- the length W is, for example, 5 mm. It is not limited to this.
- each of the distances D10 to D13 is, for example, approximately half the length (120 mm) of the working wavelength of the first frequency band.
- the distances D10 to D13 are assumed to be the same, they are not limited to this, and may be within the range of approximately 1/4 to approximately 3/4 of the working wavelength as described with reference to FIG.
- FIG. 23 is a diagram showing the relationship between the frequency of the antenna device 200a and the gain. As shown in FIG. 23, in antenna device 200a, the gain in the 1.2 GHz band is greater than the gain in the 1.6 GHz band.
- FIG. 24 is a diagram showing the relationship between the elevation angle (horizontal axis) and the gain (vertical axis) of the antenna device 200a.
- the dotted line is the waveform without slots (antenna device B), and the solid line is the waveform of the antenna device 200a.
- the gain of the antenna device 200a is greater than the gain of the antenna device B at high elevation angles.
- the gain of the antenna device 200a gradually decreases as the elevation angle increases from the zenith angle.
- the calculated average gain of the antenna device 200a for elevation angles of 0° to 60° is 1.64 dB, which is larger than the average gain (0.6 dB) of the antenna device B for elevation angles of 0° to 60°.
- the slots 310 to 313 having a length L corresponding to the working wavelength of the first frequency band around the patch antenna 400 of the antenna device 200a the average gain of the high and middle elevation angles of the first frequency band is improved, Directivity can be improved.
- the antenna device 200b is one form of the antenna device 200 capable of increasing the gain of radio waves in the second frequency band.
- the length L of each of the slots 310 to 313 is approximately half the working wavelength of the second frequency band, and the length W is sufficiently shorter than the length L.
- the used wavelength of the second frequency band is, for example, a wavelength corresponding to the center frequency (eg, approximately 1602 MHz) of the second frequency band. Therefore, since the wavelength ⁇ used here is approximately 187 mm, the length L is approximately 94 mm.
- the length W is, for example, 5 mm. It is not limited to this.
- each of the distances D10 to D13 is, for example, approximately half the length (94 mm) of the working wavelength of the second frequency band.
- the distances D10 to D13 are assumed to be the same, they are not limited to this, and may be within the range of approximately 1/4 to approximately 3/4 of the working wavelength as described with reference to FIG.
- FIG. 25 is a diagram showing the relationship between the frequency of the antenna device 200b and the gain. As shown in FIG. 25, in the antenna device 200b, the gain in the 1.6 GHz band is larger than the gain in the 1.2 GHz band.
- FIG. 26 is a diagram showing the relationship between the elevation angle (horizontal axis) and the gain (vertical axis) of the antenna device 200b.
- the dotted line is the waveform without slots (antenna device B), and the solid line is the waveform of the antenna device 200b.
- the gain of the antenna device 200b is greater than the gain of the antenna device B at high elevation angles.
- the gain of the antenna device 200b gradually decreases as the elevation angle increases from the zenith angle.
- the calculated average gain of the antenna device 200b for elevation angles of 0° to 60° is 2.29 dB, which is larger than the average gain (1.35 dB) of the antenna device B for elevation angles of 0° to 60°.
- the antenna device 200c is one form of the antenna device 200 capable of increasing the gain of radio waves in the first and second frequency bands.
- the length L of each of the slots 310 and 311 among the slots 310 to 313, for example, is approximately half (approximately 120 mm) of the working wavelength of the first frequency band.
- the length L of each of the slots 312 and 313 is approximately half the working wavelength of the first frequency band (approximately 94 mm).
- the slots 310 to 313 are set to have a length sufficiently shorter than the length L (for example, 5 mm).
- the distances D10 and D11 are set to approximately half the length (approximately 120 mm) of the working wavelength of the first frequency band, and the distances D12 and D13 are set to the second wavelength.
- the length (approximately 94 mm) is approximately half the wavelength used in the frequency band.
- the lengths L of the slots 310 to 313 are all drawn with the same length for the sake of convenience. longer than L. Similarly, among distances D10 to D13, distances D10 and D11 are longer than distances D12 and D13.
- FIG. 27 is a diagram showing the relationship between the frequency of the antenna device 200c and the gain. As shown in FIG. 27, in the antenna device 200b, the gain in the 1.6 GHz band and the gain in the 1.2 GHz band are larger than those in FIG. For example, the frequency gain at approximately 1240 MHz is approximately 3.50 dB in FIG. 22, whereas it is approximately 3.75 dB in FIG.
- FIG. 28 is a diagram showing the relationship between the elevation angle (horizontal axis) and the gain (vertical axis) of the first frequency band of the antenna device 200c.
- the dotted line is the waveform without slots (antenna device B), and the solid line is the waveform of the first frequency band.
- the gain of the antenna device 200c is greater than the gain of the antenna device B at high elevation angles.
- the gain of the antenna device 200c gradually decreases as the elevation angle increases from the zenith angle.
- the calculated average gain of the antenna device 200c for elevation angles of 0° to 60° is 1.11 dB, which is larger than the average gain (0.60 dB) of the antenna device B for elevation angles of 0° to 60°.
- FIG. 29 is a diagram showing the relationship between the elevation angle (horizontal axis) and the gain (vertical axis) of the second frequency band of the antenna device 200c.
- the dotted line is the waveform without slots (antenna device B), and the solid line is the waveform of the second frequency band.
- the gain of the antenna device 200c is greater than the gain of the antenna device B at high elevation angles.
- the gain of the antenna device 200c gradually decreases as the elevation angle increases from the zenith angle.
- the calculated average gain of the antenna device 200c for elevation angles of 0° to 60° is 1.73 dB, which is larger than the average gain (1.35 dB) of the antenna device B for elevation angles of 0° to 60°.
- slots 310 and 311 of length L corresponding to the working wavelength of the first frequency band and slots 312 and 313 of length L corresponding to the working wavelength of the second frequency band are provided. and , the directivity of the first and second frequency bands can be improved.
- the slots are formed in the base plate 20, 300, but this is not the only option.
- at least one non-feeding slot as described above may be formed in a metal portion other than the base plate 20 provided around the patch antenna 30 of the antenna device 10 .
- the patch antenna 30 may be provided on resin, and at least one metal portion (for example, a metal plate) provided with a slot may be provided around the patch antenna 30 . Even in this case, the slot is unpowered.
- the longitudinal directions of the slots 25 to 28 are arranged to be parallel to the tangent lines of the points P1 to P4 of the circle C, but the present invention is not limited to this.
- the longitudinal directions of the slots 25 to 28 are directions that can improve the directivity of the antenna device 10 even if they are not parallel to the tangent lines of the points P1 to P4 of the circle C. good.
- the antenna device of this embodiment has been described above.
- one slot 26 is provided around the patch antenna 30 in a range of 1/4 to 3/4.
- slot 26 can improve directivity while increasing the high elevation angle gain of antenna device 112 .
- the slot 26 is provided in the base plate 20, but may be provided in a metal portion different from the base plate 20 described above. Even in such a case, similar effects can be obtained.
- the slot is provided in the ground plane 20 around the patch antenna 30, but the target antenna does not have to be a patch antenna.
- the same effect as that of the present embodiment can be obtained.
- the slot is located around the patch antenna 30 within a range where the directivity of the patch antenna 30 can be improved from the center of the patch antenna 30 (hereinafter referred to as "within a predetermined range”).
- the “predetermined range” is determined based on, for example, the wavelength of radio waves (signals) received by the patch antenna 30, the area of the ground plane, the structure of the patch antenna 30, and the like.
- the antenna device 10 also has a patch antenna 30 including a dielectric member 34 and a radiation element 35 as an antenna.
- a patch antenna 30 including a dielectric member 34 and a radiation element 35 as an antenna.
- the shape of the slot 25 is a quadrilateral having a length L in the longitudinal direction and a length W in the lateral direction.
- the shape of the slot may be an ellipse or a cross, but the base plate 20 can be easily processed by using a quadrilateral.
- the length L of the slots 25 to 28 in the longitudinal direction is approximately half the working wavelength ⁇ .
- the directivity can be improved while increasing the average gain of the antenna device 10 at high and medium elevation angles, as shown in FIG. 7, for example.
- the slots 25 to 28 are positioned at approximately one-fourth or more and approximately three-quarters or less of the working wavelength ⁇ from the center point 35p (the center of the patch antenna 30). position. Therefore, by providing the slots 25 to 28 in such a range, it is possible to improve the average gain of the antenna device 10 at high and medium elevation angles and improve the directivity as compared with the case without the slots.
- the antenna device 10 has a plurality of slots, so that the average gain at high and medium elevation angles can be improved and the directivity can be improved.
- the patch antenna 30 is an antenna for receiving satellite signals of the satellite digital audio radio service. By providing the slots of the present embodiment around the patch antenna 30, the patch antenna 30 can receive satellite signals more accurately.
- the center of the patch antenna 30 coincides with the center point 35p in this embodiment, the two may be different. In such a case, the center of the patch antenna 30 may be set as the starting point of the distance D and slotted.
- “In-vehicle” in this embodiment means that it can be mounted on a vehicle, so it is not limited to those attached to the vehicle, but also includes those that are brought into the vehicle and used inside the vehicle.
- the antenna device of the present embodiment is used in a "vehicle” which is a vehicle with wheels, it is not limited to this, and can be used for flying objects such as drones, probes, and construction machines without wheels. , agricultural machinery, ships, and other moving bodies.
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Abstract
Description
図1~図3を参照しつつ、アンテナ装置10の構成の概要を説明する。図1は、アンテナ装置10の斜視図であり、図2は、アンテナ装置10の平面図である。また、図3は、パッチアンテナ30の斜視図である。なお、便宜上、図2においては、アンテナ装置10のパッチアンテナ30のみを描き、一部の構成(後述する、パッチアンテナ30を支える台座部等)は省略している。
以下、図3及び図4を参照して、パッチアンテナ30について詳細に説明する。なお、図4は、図3のA-A線のパッチアンテナ30の断面図である。なお、図4に示す斜線は、後述する導線性のパターン31,33,回路基板32,誘電体部材34,放射素子35、シールドカバー40を図面上わかり易くするために便宜上記載したものである。
==スロットの形状==
図1、及ぶ図2のスロット25は、パッチアンテナ30が受信する所望の周波数帯の電波を放射(または、反射)するために、地板20に形成された無給電の開口(または、孔)である。本実施形態のスロット25は、所望の周波数帯の使用波長に応じた長手方向の長さL、及び短手方向の長さWを有する四辺形をしている。
スロット25~28は、パッチアンテナ30の指向性を改善することができるよう、パッチアンテナ30の周囲に設けられている。具体的には、スロット25~28の夫々は、例えば、図5に示すように、放射素子35の中心点35pに対応する地板20のおもて面の位置を中心とし、半径を距離Dとする理論上の円(以下、円Cとする。)の円周上に、等間隔に設けられている。なお、本実施形態の距離Dは、例えば、使用波長の1/2(λ/2)の長さである。
ここで、誘電体部材34のサイズ、放射素子のサイズ、誘電体部材34及び放射素子35の総厚、地板20の表面から放射素子35の表面までの高さ、地板のサイズ、給電方式など、所定の条件(以下、「所定条件」と称する。)において、アンテナ装置10、及び比較例のアンテナ装置(以下、アンテナ装置Aと称する。)の利得を計算した。なお、アンテナ装置A(不図示)とは、アンテナ装置10においてスロット25~28が設けられていないものである。また、アンテナ装置10、及びアンテナ装置Aのシミュレーションにあたっては、便宜上、利得への影響の小さい回路パターン31a等を省略したモデルを用いている。
図6は、アンテナ装置A、及びアンテナ装置10の夫々において、仰角(横軸)と平均利得(縦軸)との関係を示す図である。なお、ここでは、仰角は、天頂角を0°として、水平方向の角度を90°としている。また、図6において、アンテナ装置Aの計算結果を、点線で示し、アンテナ装置10の計算結果を実線で示している。なお、これら点線上の□印及び実線上の●印は、横軸の数値に対する縦軸の数値の位置を示すものであり、それらを区別するために便宜上□印と●印で示している。なお、後述する図8、図10、図14、図20、図24、図26、図28、図29も同様であり、一点鎖線上の△印、二点鎖線上の×印も同様である。
つぎに、スロットの形状、設置条件(長さL、距離D、配置、数)を変更した場合について説明する。なお、以下に説明する条件を2以上変更させ、を組み合わせて適用してもよい。例えば、設置条件のうち、スロットの長さLと、スロットの数との2つの条件を変更しても良く、長さLと、距離Dと、配置との3つの条件を変更しても良い。
ここでは、スロット25~28の長さLを変更した場合のアンテナ装置10aの特性について検証する。なお、ここでは、4つのスロット25~28の長さLを全て同じように変化させている。また、スロット25~28の長さL以外のアンテナ装置10aの各種条件(例えば、例えばスロットの長さWや距離D)等は、上述した所定条件と同じである。
つぎに、スロット25~28の設置条件のうち、距離Dを変化させた場合のアンテナ装置10bの特性について検証する。なお、ここでは、4つのスロット25~28の距離Dを全て同じように変化させている。また、距離D以外のアンテナ装置10bの各種条件(例えば、スロットの長さL,長さW等)は、上述した所定条件と同じである。
ここでは、地板20において、4つのスロットの配置を変更した場合について説明する。なお、ここでは、4つのスロット25~28の配置以外のアンテナ装置の各種条件(例えば、スロットの長さL,長さWやパッチアンテナ30のサイズ等)は、上述した所定条件と同じである。また、詳細は後述するが、ここで、配置の変更とは、例えば、4つのスロット毎、距離Dを変更する場合と、4つのスロットの位置を、距離Dを保ちつつ、回転させた場合とを含む。
ここでは、地板20に設けるスロットの数を変更した場合について説明する。なお、ここでは、スロットの数以外のアンテナ装置の各種条件(例えば、スロットの長さL,長さWやパッチアンテナ30のサイズ等)は、上述した所定条件と同じである。
ここで、2つの周波数帯の電波を受信するアンテナ装置に対し、スロットを設けた場合の一例について説明する。
ここでは、まず、アンテナ装置200の比較例のアンテナ装置(以下、アンテナ装置Bと称する。)の利得を計算した。なお、アンテナ装置B(不図示)とは、アンテナ装置200において、4つのスロット310~313が設けられていないものである。
アンテナ装置200aは、第1周波数帯の電波の利得を、より高くできるアンテナ装置200の一形態である。アンテナ装置200aでは、スロット310~313の夫々の長さLを、第1周波数帯の使用波長の略2分の1とし、長さWを、長さLより十分短い長さとする。
アンテナ装置200bは、第2周波数帯の電波の利得をより高くできるアンテナ装置200の一形態である。アンテナ装置200bでは、スロット310~313の夫々の長さLを、第2周波数帯の使用波長の略2分の1とし、長さWを、長さLより十分短い長さとする。
アンテナ装置200cは、第1及び第2周波数帯の電波の利得をより高くできるアンテナ装置200の一形態である。アンテナ装置200cでは、スロット310~313のうち、例えばスロット310,311の夫々の長さLを、第1周波数帯の使用波長の略2分の1(略120mm)とする。そして、スロット312,313の夫々の長さLを、第1周波数帯の使用波長の略2分の1(略94mm)とする。また、スロット310~313を、上述した長さLより十分短い長さ(例えば、5mm)とする。
上述したアンテナ装置10,200では、スロットは、地板20,300に形成されることとしたが、この限りではない。例えば、アンテナ装置10のパッチアンテナ30の周囲に設けられた、地板20とは別の金属部に対し、上述した無給電のスロットを少なくとも一つ形成しても良い。例えば、パッチアンテナ30が樹脂上に設けられ、スロットを設けた金属部(例えば、金属板)をパッチアンテナ30の周囲に少なくとも一つ設けるようにしてもよい。この場合でも、そのスロットは無給電となる。このように、地板20または金属部を用いることにより、パッチアンテナ30の周囲にスロットが設けられると、パッチアンテナ30を含むアンテナ装置の高中仰角の平均利得が改善され、指向性は向上することになる。
また、例えばアンテナ装置10において、スロット25~28の夫々の長手方向は、円Cの点P1~P4の接線に対して平行となるよう配置することとしたが、これに限られない。アンテナ装置10では、スロット25~28の夫々の長手方向は、円Cの点P1~P4の接線に対して平行にならない場合であっても、アンテナ装置10の指向性を改善できる方向であれば良い。
以上、本実施形態のアンテナ装置について説明した。例えば、アンテナ装置112では1/4~3/4の範囲、パッチアンテナ30の周囲に、一つのスロット26が設けられている。このような場合、スロット26は、アンテナ装置112の高仰角の利得を増加させつつ、指向性を改善できる。また、アンテナ装置112では、スロット26は、地板20に設けられているが、上述した地板20とは異なる金属部に設けられていても良い。このような場合であっても、同様の効果を得ることができる。
20,300 地板
21 台座部
25~28,310~313 スロット
30,400 パッチアンテナ
31,33 パターン
31a 回路パターン
31b グランドパターン
32 回路基板
34 誘電体部材
35 放射素子
35a~35d 辺
35p,410p 中心点
40 シールドカバー
41 貫通孔
42 給電線
43a 給電点
45 同軸ケーブル
45a 信号線
45b 編組
45c はんだ
Claims (10)
- 所定の周波数帯の信号を受信可能な放射素子を有するアンテナと、
前記アンテナの周囲に設けられた少なくとも一つの無給電のスロットを有する金属部と、
を有するアンテナ装置。 - 地板と、
前記地板に設けられたアンテナと、を備え、
前記地板は、前記アンテナの周囲に形成された少なくとも一つの無給電のスロットを有する、
アンテナ装置。 - 請求項1または2に記載のアンテナ装置であって、
前記スロットは、前記アンテナの周囲における所定の範囲内に設けられる、
アンテナ装置。 - 請求項1~3のいずれか一つに記載のアンテナ装置であって、
前記アンテナは、
誘電体部材と、
前記誘電体部材に設けられた放射素子と、を有する
アンテナ装置。 - 請求項1~4のいずれか一つに記載のアンテナ装置であって、
前記スロットの形状は、長手方向と、短手方向とを有する四辺形である、
アンテナ装置。 - 請求項5に記載のアンテナ装置であって、
前記長手方向の長さは、所望の周波数帯の波長の略2分の1である、
アンテナ装置。 - 請求項1~3のいずれか一つに記載のアンテナ装置であって、
前記スロットは、前記アンテナの中心から、所望の周波数帯の波長の略4分の1以上、略4分の3の以下の位置に設けられる、
アンテナ装置。 - 請求項1~7の何れか一項に記載のアンテナ装置であって、
前記アンテナの周囲には、複数の前記スロットが設けられる、
アンテナ装置。 - 請求項1~8の何れか一項に記載のアンテナ装置であって、
前記アンテナは、衛星信号を受信する衛星用アンテナである、
アンテナ装置。 - 請求項1~9の何れか一項に記載のアンテナ装置であって、
前記アンテナは、パッチアンテナである、
アンテナ装置。
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CN202280016606.7A CN116888823A (zh) | 2021-02-25 | 2022-02-04 | 天线装置 |
US18/278,409 US20240235052A9 (en) | 2021-02-25 | 2022-02-04 | Antenna device |
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JP2021028102A JP2022129442A (ja) | 2021-02-25 | 2021-02-25 | アンテナ装置 |
JP2021-028102 | 2021-02-25 |
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PCT/JP2022/004480 WO2022181295A1 (ja) | 2021-02-25 | 2022-02-04 | アンテナ装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20240235052A9 (ja) |
JP (1) | JP2022129442A (ja) |
CN (1) | CN116888823A (ja) |
WO (1) | WO2022181295A1 (ja) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007306368A (ja) * | 2006-05-12 | 2007-11-22 | Furuno Electric Co Ltd | アンテナ装置及び受信装置 |
WO2013165809A1 (en) * | 2012-05-04 | 2013-11-07 | Apple Inc. | Antenna structures having slot-based parasitic elements |
-
2021
- 2021-02-25 JP JP2021028102A patent/JP2022129442A/ja active Pending
-
2022
- 2022-02-04 CN CN202280016606.7A patent/CN116888823A/zh active Pending
- 2022-02-04 WO PCT/JP2022/004480 patent/WO2022181295A1/ja active Application Filing
- 2022-02-04 US US18/278,409 patent/US20240235052A9/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007306368A (ja) * | 2006-05-12 | 2007-11-22 | Furuno Electric Co Ltd | アンテナ装置及び受信装置 |
WO2013165809A1 (en) * | 2012-05-04 | 2013-11-07 | Apple Inc. | Antenna structures having slot-based parasitic elements |
Also Published As
Publication number | Publication date |
---|---|
US20240136732A1 (en) | 2024-04-25 |
US20240235052A9 (en) | 2024-07-11 |
JP2022129442A (ja) | 2022-09-06 |
CN116888823A (zh) | 2023-10-13 |
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