CN209766633U - Patch antenna and vehicle-mounted antenna device - Google Patents
Patch antenna and vehicle-mounted antenna device Download PDFInfo
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- CN209766633U CN209766633U CN201920380928.5U CN201920380928U CN209766633U CN 209766633 U CN209766633 U CN 209766633U CN 201920380928 U CN201920380928 U CN 201920380928U CN 209766633 U CN209766633 U CN 209766633U
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- 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
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
Abstract
a small low-height patch antenna and an in-vehicle antenna device capable of stably receiving signals of a plurality of frequency bands are provided without complicating the holding structure and increasing the cost due to the use of expensive materials and materials difficult to process and mold. A1 st radiation element (11) is provided on the upper surface of a dielectric body (12) having both surfaces, and a 2 nd radiation element (13) is provided on the lower surface of the dielectric body (12). A resin base (14) having a smaller relative permittivity than the dielectric (12) is disposed between the 2 nd radiating element (13) and the ground conductor (15). The 1 st radiation element (11) and the 2 nd radiation element (13) receive signals of different frequency bands, respectively.
Description
Technical Field
the utility model relates to a patch antenna (patch antenna) and on-vehicle antenna device of using.
Background
In recent years, development of ITS (Intelligent Transport Systems) and ADAS (advanced driver assistance System) that utilize position information of a vehicle acquired by GNSS (Global Navigation Satellite System) is underway. In such a system, it is important to improve the accuracy of the position information of the vehicle. A simple method for improving the accuracy of the position information of the vehicle is to receive GNSS signals from a plurality of satellites by the vehicle and supplement each other, but in the case of the in-vehicle antenna device, the installation area is limited, and this method is difficult to implement.
That is, GNSS signals from a plurality of satellites are transmitted in different frequency bands (bands), respectively. Amplifiers and the like adjusted to the frequency band are also used. Therefore, if the number of antennas, amplifiers, and the like of the frequency band to be received is increased, the size of the in-vehicle antenna device increases.
in order to solve such a problem, in the in-vehicle antenna device disclosed in patent document 1, patch antennas each having a radiation element mounted on one surface of a dielectric are stacked in two stages so that a peak of a gain is obtained in two frequency bands when a received GNSS signal is amplified.
Documents of the prior art
patent document 1: U.S. patent application publication No. 2006/220970 specification
SUMMERY OF THE UTILITY MODEL
Problem to be solved by utility model
In a patch antenna, ceramic is often used as a dielectric for mounting a radiating element. Ceramics are generally expensive because they are indispensable for a step of sintering at high temperature during molding. Further, since the ceramic becomes extremely hard after molding and sintering, it is difficult to form a screw hole or the like for holding the ceramic after the molding. Therefore, in a device having a structure in which two patch antennas are stacked one on another as in the in-vehicle antenna device disclosed in patent document 1, not only is the material cost increased, but also a holding structure for stably and continuously holding the two patch antennas for a long time becomes complicated, which causes an increase in the cost of the entire in-vehicle antenna device. In addition, when the patch antenna of the in-vehicle antenna device disclosed in patent document 1 is formed using a ceramic material, the height thereof is 2 times or more, and the height of the in-vehicle antenna device cannot be reduced.
The utility model aims to provide a small-size low-height patch antenna which can stably receive signals of a plurality of frequency bands without causing the holding structure to become complicated, and the cost to be increased due to the increase of the use amount of ceramic materials which are expensive in raw materials and difficult to process.
Another object of the present invention is to provide an on-vehicle antenna device that can easily realize a small size and a low height even if a plurality of patch antennas are mounted.
Means for solving the problems
the utility model discloses a patch antenna's characterized in that possesses: a ground conductor; a dielectric having a 1 st face containing a point farthest from the ground conductor and a 2 nd face containing a point closest to the ground conductor; a 1 st radiation element mounted on the 1 st surface and receiving a signal of a 1 st frequency band; and a 2 nd radiation element mounted on the 2 nd surface and receiving a 2 nd frequency band signal different from the 1 st frequency band.
Effect of the utility model
According to the present invention, two radiating elements sandwich one dielectric configuration, and the two radiating elements are also separated from the ground conductor. Therefore, the present invention can realize a patch antenna having an equivalent operating characteristic to a case where two-stage overlapping of a patch antenna having one dielectric and one radiating element is performed at a low cost with a small size. In addition, the present invention can easily realize the holding structure as compared with the case where the patch antenna having one dielectric and one radiating element is overlapped at two stages. Further, by mounting such a patch antenna, it is possible to realize an inexpensive in-vehicle antenna device that is easy to reduce the size and height, and to realize an in-vehicle antenna device that is easy to hold such a patch antenna.
Drawings
Fig. 1A is a plan view of the patch antenna according to the present embodiment.
Fig. 1B is a side view of the patch antenna according to the present embodiment.
fig. 2 is an exploded perspective view of the patch antenna according to the present embodiment.
fig. 3 is a gain characteristic diagram of the patch antenna according to the present embodiment.
Fig. 4 is a simulation diagram showing a change in gain when the material of the base is changed.
Fig. 5 is a simulation diagram showing a gain change in the case where the thickness of the base is changed.
Fig. 6A is a diagram illustrating a modification of the shape of the antenna member.
Fig. 6B is a diagram illustrating a modification of the shape of the antenna member.
Fig. 6C is a diagram illustrating a modification of the shape of the antenna member.
Fig. 6D is a diagram illustrating a modification of the shape of the antenna member.
Fig. 7A is a plan view of the patch antenna according to modification 4.
Fig. 7B is a side view of the patch antenna according to modification 4.
Fig. 8 is a simulation diagram showing a gain change in the patch antenna of modification 4.
Fig. 9 is a simulation diagram showing changes in axial ratio in the patch antenna of modification 4.
Detailed Description
Hereinafter, an embodiment in which the present invention is applied to a patch antenna capable of receiving GNSS signals of a plurality of frequency bands with one patch antenna will be described.
The patch antenna according to the present embodiment receives, from a satellite, a GNSS signal of 1.2GHz band, which is an example of the 1 st band, and a GNSS signal of 1.6GHz band, which is an example of the 2 nd band. An element that receives a GNSS signal of 1.2GHz band is referred to as a "1 st radiation element", and an element that receives a GNSS signal of 1.6GHz band is referred to as a "2 nd radiation element". Each of the radiating elements is a radiating element for receiving circularly polarized waves, and is formed of a conductor pattern having a two-dimensional structure. The conductor pattern may have a structure equivalent to a microstrip (micro strip) line having both open ends, or may have a curved shape, a partial shape, a planar shape, or a combination thereof. In the present embodiment, a rectangular conductor pattern is provided that resonates in a frequency band in which the length of one side coincides with an integral multiple of 1/2 wavelength.
The patch antenna 1 is implemented as an antenna member of an in-vehicle antenna device, assuming that it is accommodated in a radio wave-transparent antenna case. When antennas having a lower reception frequency band than the patch antenna 1 are packaged together, the shape and size of the antenna case depend on the shape and size of the antennas packaged together. In the present description, the vertical upper side is referred to as "upper" and the vertical lower side (ground direction) is referred to as "lower" with respect to a vehicle-side mounting surface (e.g., a vehicle roof) on which the antenna housing is mounted.
< example of construction of Patch antenna >
Fig. 1A and 1B are external views of the patch antenna 1 according to the present embodiment, where fig. 1A is a plan view and fig. 1B is a side view. Fig. 2 is an exploded perspective view of the patch antenna 1.
The patch antenna 1 of the present embodiment has a structure in which a 1 st radiation element 11 and a 2 nd radiation element 13 having different sizes are arranged with one dielectric 12 interposed therebetween. That is, the dielectric 12 is present between the 1 st radiation element 11 and the 2 nd radiation element 13. The dielectric 12 is made of, for example, ceramic having a relative permittivity of about 20, and is formed in a quadrangular prism shape having a length of 46mm on one side in a plane parallel to the ground conductor 15 and a height in a direction perpendicular to the ground conductor 15, that is, a thickness of 7 mm. The surface portion including the point farthest from the ground conductor 15 in the quadrangular prism shape is referred to as "surface 1", and the surface portion including the point closest to the ground conductor 15 is referred to as "surface 2".
The 1 st radiation element 11 is a conductor pattern having a length of 25mm on one side in a plane parallel to the ground conductor 15, and is attached to a substantially central portion of the 1 st surface of the dielectric 12. The 2 nd radiation element 13 is a conductor pattern having a length of 46mm on one side in a plane parallel to the ground conductor 15, and is attached to substantially the entire 2 nd surface of the dielectric 12. The method of mounting the 1 st and 2 nd radiation elements 11 and 13 on the dielectric 12 can use a known method.
If the 2 nd radiating element 13 is in ground contact with the ground conductor 15 without a gap, the 2 nd radiating element 13 does not operate as a radiating element (operates as a radiating element if a corresponding gap exists). That is, if the 2 nd radiating element 13 is in ground contact with the ground conductor 15 without a gap, the patch antenna 1 performs the same operation as a normal patch antenna including a radiating element for one frequency band. In the present embodiment, in order to place the 2 nd radiation element 13 in a state of being separated from the ground conductor 15, the base 14 made of an insulating member is positioned between the 2 nd radiation element 13 and the ground conductor 15. Since the base 14 is an insulating member, even if the dielectric 12 (2 nd radiation element 13) is joined to the base 14, a problem such as a short circuit does not occur.
For example, a resin having hardness capable of being screwed can be used as the insulating member. The resin is an inexpensive insulating member and can be easily molded by injection molding or the like. Further, if a part of a member formed in advance into a predetermined shape is cut, the subsequent molding and processing are also easy. It is also possible to mold around a hard member, a wiring member, and the like.
By forming the base 14 of resin, a holding structure for the ground conductor 15 can be easily realized. For example, a plurality of holding structures of the base 14 using screws can be provided at arbitrary positions that do not affect the operating characteristics of the 1 st and 2 nd radiation elements 11 and 13. Therefore, a long-term displacement-free holding structure can be easily realized.
Any material may be used for the base 14 as long as it is an insulator (other than a conductor or a magnetic material). The base 14 of the present embodiment is made of resin having a relative dielectric constant of about 4.3, and is formed in a quadrangular prism shape having a length of 47mm on one side on a plane parallel to the ground conductor 15 and a thickness of 5mm, which is a height in a direction perpendicular to the ground conductor 15.
The ground conductor 15 is a conductor plate having a larger area than the base 14, and may be referred to as a ground plate. The ground conductor 15 is connected to a coaxial ground side at the time of power feeding to be a ground potential, and forms a patch antenna in pair with the 1 st radiation element 11 and the 2 nd radiation element 13. The area of projection of the base 14 to the ground conductor 15 is larger than the area of projection of the dielectric 12. That is, the area of each member of the patch antenna 1 when viewed from above is reduced in the order of the ground conductor 15, the base 14, the dielectric 12, the 2 nd radiation element 13, and the 1 st radiation element 11. The area of the 2 nd radiation element 13 may be smaller than the area of the 2 nd surface of the dielectric 12.
< gain characteristics >
Next, the operation characteristics, particularly the gain characteristics for each frequency, of the patch antenna 1 configured as described above will be described. Fig. 3 is a gain characteristic diagram of the patch antenna 1. The horizontal axis is frequency (GHz) and the vertical axis is gain (dBic). "dBic" represents the magnitude of the gain of the circularly polarized wave. The solid line 101 represents the change in gain at each frequency.
As shown in fig. 3, the gain of the patch antenna 1 exhibits peaks in both the 1.2GHz band and the 1.6GHz band. That is, the gain characteristic is substantially equal to that of a conventional patch antenna in which a 1.2GHz patch antenna and a 1.6GHz patch antenna are superposed.
< effects of the present embodiment >
as described above, even if the patch antenna 1 of the present embodiment includes only one expensive dielectric 12 which is difficult to process, it is possible to obtain the same gain characteristic as that obtained when two patch antennas (two dielectric elements) are stacked as in the conventional structure. Since it is not necessary to overlap the two dielectrics, the holding structure of the patch antenna 1 does not need to be complicated. In addition, since only one expensive dielectric 12 is provided, the manufacturing cost of the patch antenna 1 can be significantly reduced. By mounting such a patch antenna 1, it is possible to easily realize a reduction in size and height of the vehicle-mounted antenna.
In the present embodiment, since the 2 nd radiation element 13 and the ground conductor 15 are separated by the base 14 made of resin, the 2 nd radiation element 13 can be used for signal reception of the 2 nd frequency band without being brought to the ground potential.
In addition, when two patch antennas are overlapped as in the conventional configuration, the upper patch antenna and the lower patch antenna are generally formed to have physically different sizes. For example, when the lower patch antenna is larger than the upper patch antenna, the dielectric of the lower patch antenna is also larger than the dielectric of the upper patch antenna. In contrast, the 2 nd radiation element 13 of the patch antenna 1 of the present embodiment is attached to the dielectric 12, and the 2 nd radiation element 13 is separated from the ground conductor 15 by the base 14. Therefore, it is not necessary to form the submount 14 and the 2 nd radiating element 13 into physically different sizes, and it is not necessary to make the submount 14 physically larger than the 2 nd radiating element 13. Therefore, a physically small dielectric size can be selected for a conventional structure in which two patch antennas are stacked, and the effect of downsizing and height reduction can be obtained as compared with the conventional structure.
In addition, when two dielectric patch antennas of the same kind, such as ceramic antennas, are stacked as in the conventional structure, the radiation element of the lower patch antenna tends to be larger than the radiation element of the upper patch antenna. In this case, the reception band of the radiation element of the upper patch antenna needs to be higher than the reception band of the radiation element of the lower patch antenna. In contrast, in the patch antenna 1 of the present embodiment, there is no limitation on the receivable frequency band due to the positional relationship in the height direction of the radiation elements, as in the case where the 1 st radiation element 11 is used for the 1.2GHz band and the 2 nd radiation element 13 is used for the 1.6GHz band. Therefore, according to the present embodiment, the effect of improving the degree of freedom in designing the patch antenna 1 can be obtained.
Since the base 14 used in the present embodiment uses a resin having a hardness capable of being screwed, a holding structure using a screw or the like for holding the base 14 can be designed to have an arbitrary structure and can be changed later. From this viewpoint, the patch antenna 1 of the present embodiment can obtain an effect of improving the degree of freedom of design thereof.
< modification 1>
In the present embodiment, an example has been described in which the base 14 is made of a resin having a relative permittivity of 4.3, but it can be replaced with an insulating member such as air or alumina, that is, an insulating member made of a material having a different relative permittivity. In the case of air, the base 14 is formed of a frame (skeleton) made of resin or a small spacer. Fig. 4 is a simulation diagram showing a relationship between the frequency (horizontal axis: GHz) and the gain (vertical axis: dBic) of the patch antenna 1 for each material of the base 14. The solid line 101 shows the characteristics in the case of the above-described resin (relative permittivity 4.3), the short dashed line 102 shows the characteristics in the case of air (relative permittivity 1), and the long dashed line 103 shows the characteristics in the case of alumina (relative permittivity 9.5).
As shown in fig. 4, even if the base 14 is replaced with a material having a different relative permittivity, that is, even if the material of the insulating material constituting the base 14 changes, there is no large difference in the magnitude of the gain at the peak in the 1.2GHz band. On the other hand, the magnitude of the gain of the peak in the 1.6GHz band is highest when the base 14 is alumina (long dashed line 103), the second position is a resin (solid line 101), and the third position is air (short dashed line 102). That is, if only the gain of the patch antenna 1 is focused, the base 14 can be made of a material having a high relative dielectric constant, such as alumina, but alumina is expensive, as is ceramics, and the manufacturing cost increases. In the case of air, a frame or the like must be separately prepared, which leads to an increase in cost. The resin base 14 which is easy to mold and process is preferable in terms of cost performance.
< modification 2>
In the present embodiment, the example in which the height of the base 14 (made of resin having a length of 47mm on one side on a plane parallel to the ground conductor 15) is 5mm has been described, but the height of the base 14 can be appropriately changed depending on the size of the antenna case and the relationship with the antennas of other frequency bands packed together. Fig. 5 is a simulation diagram showing a relationship between the frequency (horizontal axis: GHz) and the gain (vertical axis: dBic) of the patch antenna 1 when the thickness of the base 14 is changed. The solid line 101 represents the above-mentioned characteristic in the case of 5mm, the broken line 104 represents the characteristic in the case of 2mm, and the chain line 105 represents the characteristic in the case of 8 mm.
When the thickness of the base 14 is changed, the electrical length between the 1 st radiation element 11 and the ground conductor 15 changes. However, since the base 14 has a lower relative permittivity than the dielectric 12, the electrical length between the 1 st radiation element 11 and the ground conductor 15 depends mainly on the size of the dielectric 12. Therefore, the change in the gain characteristic of the 1 st radiation element 11 caused by changing the thickness of the base 14 is smaller than the change in the gain characteristic of the 2 nd radiation element 13.
In fact, as shown in fig. 5, even if the thickness of the base 14 changes, there is no large difference in the magnitude of the gain of the peak in the 1.2GHz band. The magnitude of the gain of the peak in the 1.6GHz band is not greatly different between the case where the thickness of the base 14 is 5mm (solid line 101) and the case where the thickness is 8mm (dashed-dotted line 105).
On the other hand, when the thickness of the base 14 is 2mm (broken line 104), the gain of the patch antenna 1 is slightly lower than that of the base 14 having thicknesses of 5mm (solid line 101) and 8mm (dashed-dotted line 105), and the frequency at which the gain is a peak is shifted to a lower side. Since the gain does not have any relationship between the 1.2GHz band and the gain in the frequency bands other than the 1.6GHz band, if the thickness of the base 14 is about 5mm, the thickness is not necessarily equal to or larger than this. Therefore, it is possible to contribute to the reduction in height of the patch antenna 1.
Needless to say, the thickness of the dielectric layer may be set to about 2mm or more and about 5mm or less for use in signal reception at a low frequency in the 1.6GHz band.
< modification 3>
In the present embodiment, an example is described in which the dielectric body 12, the base 14, and the ground conductor 15 are all rectangular when viewed from above, but these shapes can be appropriately changed depending on the space in which the patch antenna 1 can be installed and the required operating characteristics.
Fig. 6A to 6D are plan views showing variations of the plan view of the patch antenna 1. The 1 st radiation element 11 and the 2 nd radiation element 13 are both elements having a conductor pattern of a rectangular shape when viewed from above.
Fig. 6A shows an example in which the dielectric 12 and the ground conductor 15 have a rectangular shape, but the base 24 has a circular shape. The base 24 is a circumscribed circle of the dielectric 12. Therefore, the dielectric 12 and the base 24 have substantially the same area when viewed from above.
Fig. 6B shows an example in which the base 14 and the ground conductor 15 have a rectangular shape, but the dielectric 22 has a circular shape. The dielectric 22 forms an inscribed circle of the base 14.
Fig. 6C shows an example in which the dielectric 12 has a rectangular shape, but the base 24 and the ground conductor 25 have a circular shape. The base 24 is a circumscribed circle of the dielectric 12.
Fig. 6D shows an example in which the dielectric 22, the base 24, and the ground conductor 25 are circular. The inner diameter increases in the order of the dielectric 22, the base 24, and the ground conductor 25.
According to the simulation by the present inventors, it was found that even if the shape of each member changes when viewed from above, if the area of the base 24 is substantially equal to the area of the dielectric 12, the peak values of the gain appear in the 1.2GHz band and the 1.6GHz band, as in the patch antenna 1 of embodiment 1. Therefore, the antenna housing that houses the patch antenna 1 can be formed in any shape of component depending on the shape, installation space, or fixing structure of the antenna housing, and the degree of freedom in designing the patch antenna 1 can be improved.
< modification 4>
As described above, base 14 made of resin is easier to mold and process than dielectric 12. Since the 2 nd radiation element 13 is opposed to the base 14, the ends of the two are close to each other. Since the relative permittivity of the base 14 described in embodiment 1 is 4.3 and the relative permittivity of air is 1.0, the gain of the 2 nd radiation element 13 is affected by the difference in the relative permittivity at the boundary between the end portions of the two. In modification 4, the influence of the size of the base 14 on the 2 nd radiation element 13 will be described.
Fig. 7A is a plan view of the patch antenna according to modification 4, and fig. 7B is a side view of the patch antenna viewed from a direction of 180 degrees when the upper side of the paper surface of fig. 7A is set to 0 degrees. Corresponding to fig. 6C, but the ground conductor 15 is omitted. The patch antenna has a component shape as viewed from above: the case where the 1 st radiation element 11 and the dielectric body 12 (the same applies to the 2 nd radiation element 13 on the 2 nd surface of the dielectric body 12) are rectangular, and the bases 241, 242, and 243 are circular. The length of one side of the 1 st radiation element 11 is 25mm, and the length of one side of the dielectric 12 and the 2 nd radiation element 13 is 47 mm. Regarding the inner diameter, the base 241 is 44mm, the base 242 is 56mm, and the base 243 is 68 mm. The base 242 has substantially the same area as the base 14 of embodiment 1. The thickness of the dielectric 12 is 7mm, and the thickness of the bases 241, 242, 243 is 5 mm.
Fig. 8 is a simulation diagram showing a relationship between a frequency (horizontal axis: GHz) and a gain (vertical axis: dBic) of the patch antenna according to modification 4. Fig. 9 is a simulation diagram showing a relationship between a frequency (horizontal axis: GHz) and an antenna axial ratio (vertical axis: dBic) of the patch antenna according to modification 4. The antenna axial ratio is an index indicating how close to a perfect circularly polarized wave, and if the antenna axial ratio is within 3dB in the received frequency band, equalization (almost perfect circularly polarized wave) can be called. In these figures, a solid line 101 indicates the characteristics of the base 14 of embodiment 1, a short dashed line 202 indicates the characteristics of the base 241, a dashed-dotted line 203 indicates the characteristics of the base 242, and a long dashed line 204 indicates the characteristics of the base 243.
As shown in fig. 8 and 9, in the patch antenna (one-dot broken line 203) in the case of the base 242, the gain shows peaks in both the 1.2GHz band and the 1.6GHz band and the antenna axial ratio is substantially equal, as in the patch antenna 1 (solid line 101) of embodiment 1. That is, if the areas are substantially the same, no change in gain characteristics or antenna axial ratio is observed.
On the other hand, in the patch antenna (short dashed line 202) in the case of the base 241, the frequency showing the peak of the gain changes from the 1.6GHz band to a higher band. In the patch antenna (long dashed line 204) in the case of the base 243, the frequency showing the peak of the gain changes from the 1.6GHz band to a lower band. The antenna axial ratios are substantially equal in all of 1.0GHz to 1.6GHz, but the higher frequency band is more equal in the patch antenna (short dashed line 202) in the case of the base 241, and the lower frequency band is more equal in the patch antenna (long dashed line 204) in the case of the base 243.
when the operating characteristics of the patch antenna 1, for example, the gain characteristics and the axial ratio described above are to be changed, the size and position of the 1 st radiation element 11 or the 2 nd radiation element 13 are usually changed. However, as is clear from fig. 8 and 9, the object can be achieved by adjusting the area and thickness of the base 14, which is relatively easy to machine and inexpensive, as viewed from above, even if this is not the case. In particular, by changing the area of the base 14, the gain characteristic of the 2 nd radiation element 13 can be largely changed.
< modification 5>
In the present embodiment, the following is explained: the 1 st and 2 nd radiation elements 11 and 13 are arranged with the dielectric 12 interposed therebetween, and the 1 st and 2 nd radiation elements 11 and 13 are separated from the ground conductor 15, respectively, whereby the gain of the patch antenna 1 shows peaks at two positions. However, the peak value of the gain can be three or more even with two radiation elements 11 and 13.
For example, a part of the conductor pattern of at least one of the 1 st and 2 nd radiation elements 11 and 13 is a groove, a slit, or a combination thereof having an electrical length different from that of the conductor pattern as a whole (a length at which the two gain peaks described above occur). The length of the inner wall starting from the feed point in the slot or slit is an electrical length. This makes it possible to set three or more frequency bands in which the gain is a peak.
< other modification >
In the above description, the 1 st radiation element 11, the dielectric 12, the 2 nd radiation element 13, the base 14, and the ground conductor 15 have a rectangular shape or a circular shape when viewed from above. However, the rectangular shape and the circular shape are merely representative examples of the shape, and the same description holds even for a substantially rectangular shape, a substantially circular shape, an elliptical shape, or a substantially elliptical shape.
Further, the gain characteristic can be substantially equal to that of the patch antenna 1 according to embodiment 1, provided that the area of the base 14 is substantially equal to the area of the dielectric body 12, without being limited to the rectangular shape, and even a polygonal shape (or a substantially polygonal shape) having a triangular shape or a pentagonal shape or more.
In the above description, the example in which the relative permittivity of base 14 is lower than the relative permittivity of dielectric 12 has been described, but this need not always be the case. Depending on the application, the relative permittivity of base 14 may be higher than the relative permittivity of dielectric 12.
Claims (12)
1. A patch antenna provided with a ground conductor, the patch antenna being characterized by further comprising:
A dielectric having a 1 st face containing a point farthest from the ground conductor and a 2 nd face containing a point closest to the ground conductor;
A 1 st radiation element mounted on the 1 st surface and receiving a signal of a 1 st frequency band; and
And a 2 nd radiation element mounted on the 2 nd surface and receiving a 2 nd frequency band signal different from the 1 st frequency band.
2. Patch antenna according to claim 1,
The 2 nd radiating element is oversized relative to the 1 st radiating element,
The dielectric is a size above the 2 nd radiating element.
3. Patch antenna according to claim 1,
The device further includes a base located between the dielectric and the ground conductor and made of an insulating member.
4. Patch antenna according to claim 2,
the device further includes a base located between the dielectric and the ground conductor and made of an insulating member.
5. Patch antenna according to claim 3,
The base is made of resin and has a holding structure for holding the dielectric member with respect to the ground conductor.
6. Patch antenna according to claim 4,
the base is made of resin and has a holding structure for holding the dielectric member with respect to the ground conductor.
7. patch antenna according to claim 3,
The projected area of the base to the ground conductor is larger than the projected area of the dielectric.
8. Patch antenna according to claim 4,
The projected area of the base to the ground conductor is larger than the projected area of the dielectric.
9. Patch antenna according to claim 3,
The thickness of the base in the direction from the ground conductor toward the dielectric is about 2mm or more and about 5mm or less.
10. patch antenna according to claim 4,
The thickness of the base in the direction from the ground conductor toward the dielectric is about 2mm or more and about 5mm or less.
11. Patch antenna according to claim 1,
At least one of the 1 st and 2 nd radiation elements is a conductor pattern,
A groove, a slit, a bend, a fractal, or a combination thereof is formed at a portion of the conductor pattern.
12. an antenna device for a vehicle, comprising: an antenna housing; and a patch antenna housed in the antenna case, the antenna device for a vehicle being characterized in that,
The patch antenna is the patch antenna of any one of claims 1 to 11.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018085809A JP6775544B2 (en) | 2018-04-26 | 2018-04-26 | Patch antenna and in-vehicle antenna device |
| JP2018-085809 | 2018-04-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209766633U true CN209766633U (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920380928.5U Active CN209766633U (en) | 2018-04-26 | 2019-03-25 | Patch antenna and vehicle-mounted antenna device |
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| Country | Link |
|---|---|
| JP (1) | JP6775544B2 (en) |
| CN (1) | CN209766633U (en) |
| WO (1) | WO2019208056A1 (en) |
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| JP3006399B2 (en) * | 1994-02-28 | 2000-02-07 | 松下電工株式会社 | Dual band antenna |
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| AU2003228322A1 (en) * | 2002-03-15 | 2003-09-29 | The Board Of Trustees Of The Leland Stanford Junior University | Dual-element microstrip patch antenna for mitigating radio frequency interference |
| JP2003347838A (en) * | 2002-05-30 | 2003-12-05 | Yokowo Co Ltd | Antenna device |
| JP3884339B2 (en) * | 2002-07-09 | 2007-02-21 | 古河電気工業株式会社 | Planar patch antenna manufacturing method |
| DE102004035064A1 (en) * | 2004-07-20 | 2006-02-16 | Receptec Gmbh | antenna module |
| JP4611039B2 (en) * | 2005-01-25 | 2011-01-12 | 古野電気株式会社 | antenna |
| JP4385005B2 (en) * | 2005-05-20 | 2009-12-16 | 株式会社日本自動車部品総合研究所 | Circularly polarized antenna |
| US7277056B1 (en) * | 2006-09-15 | 2007-10-02 | Laird Technologies, Inc. | Stacked patch antennas |
| CN103199343B (en) * | 2006-11-06 | 2016-08-10 | 株式会社村田制作所 | Patch antenna device and antenna assembly |
| ITPD20080132A1 (en) * | 2008-04-29 | 2009-10-30 | Calearo Antenne Spa | MODULE OF MULTIFUNCTIONAL ANTENNA FOR THE TREATMENT OF A MULTIPLICITY OF SIGNALS IN RADIO FREQUENCY. |
| US8174450B2 (en) * | 2008-04-30 | 2012-05-08 | Topcon Gps, Llc | Broadband micropatch antenna system with reduced sensitivity to multipath reception |
| US8633856B2 (en) * | 2009-07-02 | 2014-01-21 | Blackberry Limited | Compact single feed dual-polarized dual-frequency band microstrip antenna array |
| JP2011155479A (en) * | 2010-01-27 | 2011-08-11 | Murata Mfg Co Ltd | Wideband antenna |
-
2018
- 2018-04-26 JP JP2018085809A patent/JP6775544B2/en active Active
-
2019
- 2019-03-25 CN CN201920380928.5U patent/CN209766633U/en active Active
- 2019-03-25 WO PCT/JP2019/012364 patent/WO2019208056A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019208056A1 (en) | 2019-10-31 |
| JP6775544B2 (en) | 2020-10-28 |
| JP2019193167A (en) | 2019-10-31 |
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