Technical field
[0001]
　The present invention relates to a planar antenna, more particularly to a plurality of planar antenna antenna elements are arranged.
Background technique
[0002]
　In the communication using the microwave, satellite dish and the planar antenna is used having a directivity. Particularly in recent years, a planar antenna that can reduce the installation space than the parabolic antenna has attracted attention.
[0003]
　Patent Document 1, while suppressing the side lobe characteristics are degraded, technology related planar radar capable of reducing the number of antenna elements (antenna unit) is disclosed. The planar radar disclosed in Patent Document 1, by arranging the antenna unit in a cross shape.
[0004]
　Patent Document 2, without reducing the gain discloses a technique related to a planar antenna that can realize low sidelobe directivity characteristics.
CITATION
Patent Document
[0005]
Patent Document 1: Japanese Patent Publication No. 9-72952
Patent Document 2: Laid-Open Patent Publication No. 2010-41700
Summary of the Invention
Problems that the Invention is to Solve
[0006]
　The plurality of planar antenna antenna elements are arranged, for reasons of easiness of designing of the power supply circuit, the number of general antenna element is increased by a power of 2. In this case, the gain of the planar antenna becomes discrete. To adjust such discretely varying the gain of the planar antenna, it is necessary to adjust the number of antenna elements, if not properly adjusted antenna element of the planar antenna characteristics (in particular, side lobe characteristics) but there is a problem of deterioration. For example, in the plan radar disclosed in Patent Document 1, when it is arranged an antenna unit (antenna element) in a cross shape, arranged in this way the antenna units (antenna element) in a cross shape, antenna characteristics It deteriorates (refer to FIG. 20, FIG. 21).
[0007]
　An object of the present invention in view of the above problems, while maintaining a sidelobe, is to provide a planar antenna capable of adjusting the gain of the antenna.
Means for Solving the Problems
[0008]
　The planar antenna according to one embodiment of the present invention is a planar antenna in which a plurality of antenna elements are arranged, N polygon (N is an even number of 4 or more) two corner portions each cutting opposed to each other out of the corners of the characterized in that it is a critical shape.
[0009]
　The planar antenna according to one embodiment of the present invention is a planar antenna having a plurality of antenna elements are arranged, characterized in that the octagonal shape and a two interior angle of 90 ° interior angles 6 and 270 degrees to.
[0010]
　The planar antenna according to one embodiment of the present invention is a planar antenna in which a plurality of antenna elements are arrayed, it has a shape in which the center portion of the rectangle is carefully hollowed in a rectangular shape.
Effect of the Invention
[0011]
　The present invention, while maintaining the sidelobe, it is possible to provide a planar antenna capable of adjusting the gain of the antenna.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012]
Is a plan view showing a planar antenna according to the FIG. 1 embodiment.
It is a plan view showing another embodiment of such a planar antenna in the form of FIG. 2 embodiment.
3 is a plan view showing another embodiment of a planar antenna according to the embodiment.
[FIG 4A] is a plan view showing an example of a power supply circuit included in the planar antenna according to the embodiment.
[FIG. 4B] is a plan view showing an example of a power supply circuit included in the planar antenna according to the embodiment.
FIG. 5 is a plan view showing another embodiment of a planar antenna according to the embodiment.
Is a diagram showing the electric field distribution of the shape and the opening face of the FIG. 6A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 6B] FIG 6A.
Is a diagram showing the Figure 7A] of the planar antenna shape.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 7B] Figure 7A.
Is a diagram illustrating a FIG. 8A] in the planar antenna shape.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 8B] Figure 8A.
9 is a diagram showing the relation between antenna area and the planar antenna gain.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 10A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 10B] FIG 10A.
Is a diagram illustrating a FIG. 11A] of the planar antenna shape.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 11B] FIG 11A.
Is a diagram illustrating a FIG. 12A] of the planar antenna shape.
It shows a side lobe characteristics of the planar antenna shown in FIG. 12B] FIG 12A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 13A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 13B] FIG 13A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 14A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 14B] FIG 14A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 15A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 15B] FIG 15A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 16A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 16B] FIG 16A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 17A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 17B] FIG 17A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 18A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 18B] FIG 18A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 19A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 19B] FIG 19A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 20A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 20B] FIG 20A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 21A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 21B] FIG 21A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 22A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 22B] FIG 22A.
Is a diagram showing the electric field distribution of the shape and the opening surface of FIG. 23A] planar antenna.
It is a diagram showing a side lobe characteristics of the planar antenna shown in FIG. 23B] FIG 23A.
DESCRIPTION OF THE INVENTION
[0013]
　Hereinafter, with reference to the drawings will be described embodiments of the present invention.
　The planar antenna according to present invention is a planar antenna having a plurality of antenna elements are arranged, two corner portions facing each other of the corners of the N polygon (N is even number of 4 or more) were all respectively cutting It is characterized by having a shape. Here, N prismatic, square, hexagonal, and polygonal such as octagonal. Two corners facing each other of the corner of FIG. 1 to FIG. 3 shows the case that all respectively cut. Also it shows the case where two corners facing each other of the corners of the hexagon in Fig. 5 is essential each cutting. It will now be described in detail a planar antenna according to the present embodiment.
[0014]
　Figure 1 is a plan view showing a planar antenna according to this embodiment. As shown in FIG. 1, the planar antenna 1, square 11 (i.e., the outer periphery including the broken line in FIG. 1) the two corner portions 12, 13 which face each other of the four corners included in is essential each cutting shape having. Specifically, the planar antenna 1, square 11 horizontal (x-axis direction of the four corners (diagonal arranged square to be parallel respectively to the x-axis and y-axis directions of each) comprises two corner portions 12 and 13 facing each other has a notched shape in each rectangular shape in). Here, the horizontal direction (x-axis direction) corresponds to the amplitude direction of the horizontally polarized wave. Further, the vertical direction (y-axis direction) corresponds to the amplitude direction of the vertical polarization.
[0015]
　For example, the planar antenna 1, a plurality of antenna elements 32 (see FIG. 4A) is constructed by combining a plurality of antenna units 10 square arrayed. In the planar antenna 1 illustrated in FIG. 1 to form a planar antenna by combining seven antenna unit 10.
[0016]
　Further, in this embodiment, as in the planar antenna 2 shown in FIG. 2, the four antenna unit 10 and the first unit 21 arranged in a square, the three antenna units 10 are arranged in L-shape a second unit 22 may constitute a planar antenna in combination. In this case, the recess 24 of the second unit 22 is arranged to interface with one corner 23 of the first unit 21. Also in the planar antenna 2 shown in FIG. 2, as with the planar antenna 1 shown in FIG. 1, facing each other in the horizontal direction (x-axis direction) of the four corners square 11 comprises two corner portions 12 and 13 but the cut-out shape in each square shape.
[0017]
　Further, in the present embodiment, FIG. 1, is not limited to the configuration that combines a plurality of antenna units 10 to the planar antenna 1 illustrated in FIG. 2, of the planar antenna 3 shown in FIG. 3, for example the planar antenna may be formed integrally as. That may constitute a planar antennas in one antenna unit. In this way, be configured with a single antenna units planar antenna, it is possible to eliminate seams between the antenna unit, it is possible to improve the strength of the planar antenna.
[0018]
　Incidentally, when the planar antenna according to the embodiment represented using other expressions, as shown in FIG. 3, representing a 90 degree internal angle α of between 6 and 270 ° interior angles β two comprises octagonal be able to. Here, octagon is axisymmetrical with respect to the two axes of symmetry 15 and 16, the two axes of symmetry 15 and 16 are perpendicular to each other.
[0019]
　4A, 4B is a plan view showing an example of the power supply circuit planar antenna 1 according to this embodiment is provided. As shown in the upper diagram of FIG. 4A, the antenna unit 30 comprises a plurality of antenna elements 32 (microstrip antenna). Each of the antenna elements 32 are arranged in a lattice pattern on the dielectric substrate 31. Specifically, each of the antenna elements 32 are arranged in parallel to the four sides of the antenna unit 30. Each antenna element 32 is electrically connected with the microstrip line (power supply circuit) 33. For example, a microstrip line (power supply circuit) 33 is formed in the same layer as the antenna element 32.
[0020]
　Antenna unit 30 shown in the upper diagram of FIG. 4A, an antenna element 32 of the 64 elements. Then, by combining four of the antenna unit 30, it is possible to configure the antenna unit 35 as shown in the lower part of FIG. 4A. Antenna unit 35 includes an antenna element 32 of the 256 devices (64 devices × 4). Each antenna element 32 is connected with the microstrip line (power supply circuit). That is, the antenna element 32 of the 256 elements included in the antenna unit 35 is electrically connected to the contacts 36 with the microstrip line (power supply circuit) 33.
[0021]
　Then, as shown in FIG. 4B, by combining the antenna unit 35 seven, it is possible to configure the planar antenna 1. Planar antenna 1 includes an antenna element 32 of 1792 elements (256 elements × 7). Contact 36 of each antenna unit 35 is connected with the microstrip line (power supply circuit) 44, 45.
[0022]
　That is, in the first unit 21 arranged the four antenna units 35 into a square (see FIG. 2), the contacts 36 of four antenna units 35 are connected with the microstrip line (power supply circuit) 44 . In other words, the contacts 36 of four antenna units 35 are electrically connected to the contact 41 by using a microstrip line (power supply circuit) 44.
[0023]
　Also connected to three antenna units 35 in the second unit 22 arranged in an L-shape (see FIG. 2), the contacts 36 of the three antenna units 35 using a microstrip line (power supply circuit) 45 ing. In other words, the contacts 36 of the three antenna units 35 are electrically connected to the contact 42 with the microstrip line (power supply circuit) 45.
[0024]
　Then, the contact 41 of the first unit 21 contacts 42 of the second unit 22 is connected with the wire 46. For example, the wiring 46 is formed in a layer different from the antenna element 32 and the microstrip line (power supply circuit) 33. In this case, the contact 41 of the first unit 21 is the point of contact 42 and equidistant second unit 22 the feed point 43.
[0025]
　Incidentally, FIG. 4A, the number of elements in the arrangement and the antenna element 32 of the antenna element 32 shown in FIG. 4B is an example, it may be configured other than this is a flat antenna according to this embodiment. Further, FIG. 4A, has been described planar antenna and a Figure 4B the antenna element and the microstrip line (power supply circuit), the invention according to this embodiment may be applied to other of the planar antenna. For example, the invention according to this embodiment constitutes an antenna element in the slot antenna, the feeding circuit can also be applied to the planar antenna constructed by using the waveguide circuit.
[0026]
　Although square 11 in the above case has been described where a square, rectangle 11 in the planar antenna according to the present embodiment may be a rhombus.
[0027]
　Figure 5 is a plan view showing another embodiment of a planar antenna according to the present embodiment. In the planar antenna 6 shown in FIG. 5 shows a case where two corners 17, 18 facing each other among the hexagonal corners were all respectively cut. Thus, even by cutting a hexagonal two corners 17 and 18, it is possible to obtain the same effect as in the case of cutting a square corner portions 12 and 13.
[0028]
　6A is a diagram showing the shape of a planar antenna (corresponding to the plane antenna 1 shown in FIG. 1), the electric field distribution of the aperture plane of the planar antenna (x-axis direction). Further, FIG. 6B is a diagram showing a side lobe characteristics of the planar antenna illustrated in Figure 6A. As shown in FIG. 6A, in the planar antenna 1 illustrated in FIG. 1, the electric field distribution in the aperture plane (x-axis direction) (the ie tapered distribution) low made at both ends of the x-axis direction. Also, if you look at the side lobe characteristics, the gain is less than the standard value in the radiation angle of 0 ° to 90 °. Therefore, the planar antenna 1 shown in FIG. 1 with good sidelobe characteristics.
[0029]
　Next, the case of changing the notch of the corner portion 12, 13 of the planar antenna 1 illustrated in FIG. In the following description, also described as notches 12, 13 corners 12 and 13 is cut out.
[0030]
　As shown in FIG. 7A, the case where the notched portions 12 and 13 of the planar antenna and 1/4 of the area of ​​the antenna unit 10, the side lobe characteristic as shown in Figure 7B. That is, although sidelobe than this case shown in FIG. 6B is slightly degraded, the gain of the radiation angle of 0 ° to 90 ° is below the standard value, with good sidelobe characteristics.
[0031]
　At this time, when one one side of the antenna unit 10 (square), is 0.5 side notches 12 and 13 (square). In other words, each of the notches 12 and 13, has an area of ​​1/36 of the area of ​​the square formed by arranging nine antenna units 10.
[0032]
　Further, as shown in FIG. 8A, the case where the notched portions 12 and 13 of the planar antenna and 9/4 the area of ​​the antenna unit 10, the side lobe characteristic as shown in FIG. 8B. That is, in this case, the low angle side of the side lobes elevated characteristics deteriorate. This is because the area of ​​the planar antenna becomes small.
[0033]
　At this time, when one one side of the antenna unit 10 (square), one side of the notches 12 and 13 (square) is 1.5. In other words, each of the notches 12 and 13, has a quarter of the area of ​​the square area formed by arranging nine antenna units 10.
[0034]
　7, from the results shown in FIG. 8, a planar antenna according to the present embodiment, each of the notches 12 and 13 square area (second square) is arranged nine antenna units 10 (first it is preferable to be 1/36 or more 1/9 or less of the area of ​​the square). At this time, the upper limit of the area of ​​each of the notches 12 and 13 corresponds to the area of ​​one antenna unit 10.
[0035]
　As described in the background art, the communication using the microwave, satellite dish and the planar antenna is used having a directivity. Particularly in recent years, the planar antenna can reduce the installation space than the parabolic antenna has attracted attention. At this time, in order to effectively use the frequency, there is a need for planar antennas available horizontal polarization and polarization of both vertically polarized waves, for example, two diagonal lines parallel to respectively horizontal and vertical directions planar antenna arranged squares so has been used (see FIG. 15, FIG. 23). The planar antenna of such a square, each of the antenna elements are arranged in a grid. Therefore, for reasons of easiness of designing of the power supply circuit, since it is designed so that the number of antenna elements in such a planar antennas increases by power of 2, gain of the planar antenna has been a discrete .
[0036]
　Figure 9 is a diagram showing the relationship between the antenna area and the planar antenna gain. As shown in FIG. 9, the square planar antenna, number 64 elements of the antenna elements, 256 elements, 1024 elements, for discretely changed as 4096 elements, the gain is also discretely (e.g., in 6dB units )Change. Here, the broken line illustrated in FIG 9 shows the gain planar antenna on the assumption that -1.5dB the aperture efficiency spacing of the antenna elements in 0.85Ramuda.
[0037]
　Thus, when designing a planar antenna such that the number of antenna elements is increased by a power of 2, for example, the following design values ​​of the planar antenna of 1024 elements becomes 4096 elements, for example to satisfy the gain of 40dBi had to use a planar antenna 4096 element. Therefore, there is a case that a characteristic of the planar antenna the cost of the planar antenna becomes over specification increases. Thus, for example, in order to realize a square planar antenna (between 1024 elements and 4096 element) having a gain of 40DBi, it is necessary to appropriately adjust the number of antenna elements.
[0038]
　However, when adjusting the gain of the planar antenna is suitably adjusted without the planar antenna characteristics the number of antenna elements (in particular, side lobe characteristics) is deteriorated. For example, in the plan radar disclosed in Patent Document 1, when it is arranged an antenna unit (antenna element) in a cross shape, arranged in this way the antenna units (antenna element) in a cross shape, antenna characteristics It deteriorates (refer to FIG. 20, FIG. 21).
[0039]
　In the invention according to this embodiment Therefore, the shape of the planar antenna 1, N polygon (N is an even number of 4 or more) are the two corners facing each other of the corner portions of is vital respectively cut shape. For example, as shown in FIG. 1, it has a shape in which two corners 12 and 13 which face each other of the four corners with the shape of the planar antenna 1 is square 11 is essential each cutting. Thus, by providing the cutout portion, it is possible to adjust the number of antenna elements (i.e., it is possible to reduce the number of antenna elements), it is possible to adjust the gain of the planar antenna. At this time, in the invention according to this embodiment, since the N polygon (N is an even number of 4 or more) are two corners facing each other of the corners of lacking each cut, that sidelobe characteristics deteriorate can be suppressed (Fig. 6A, see Fig. 6B). Further, it is possible to reduce the number of antenna elements while satisfying the antenna gain necessary can be produced at low cost planar antenna.
[0040]
　The invention according to this embodiment described above, while maintaining the sidelobe, it is possible to provide a planar antenna capable of adjusting the gain of the antenna.
[0041]
　Next, a description will be given of variations of the present invention.
　In this embodiment, as shown in FIG. 10A, as the shape planar antenna 4 of the two corner portions 52 and 53 facing each other it is respectively cut in a rectangular shape in the vertical direction of the four corners included in the square it may be. That is, the planar antenna 1 may have a shape that is rotated 90 degrees as shown in FIG.
[0042]
　As shown in FIG. 10A, the electric field distribution in the aperture plane of the planar antenna 4 (x-axis direction) is lower in the both end portions and central portion of the x-axis direction. Also comprises Looking for sidelobe shown in FIG. 10B, the gain in the radiation angle of 0 ° to 90 ° is below the standard value, good sidelobe.
[0043]
　Next, the case of changing the notch of the corner portion 52, 53 of the planar antenna 4 shown in FIG. 10A. In the following description, also described as notches 52 and 53 corners 52 and 53 is cut out.
[0044]
　As shown in FIG. 11A, the case where the notches 52 and 53 of the planar antenna and 1/4 of the area of ​​the antenna unit 10, the side lobe characteristic as shown in FIG. 11B. That is, although sidelobe than this case shown in FIG. 10B is slightly degraded, the gain is below a standard value of the radiation angle of 0 ° to 90 °. Thus, with good side lobe characteristics.
[0045]
　At this time, when one one side of the antenna unit 10 (square), is 0.5 side notches 52 and 53 (square). In other words, each of the notches 52 and 53, has an area of ​​1/36 of the area of ​​the square formed by arranging nine antenna units 10.
[0046]
　Further, as shown in FIG. 12A, the case where the notches 52 and 53 of the planar antenna and 9/4 the area of ​​the antenna unit 10, the side lobe characteristic as shown in FIG. 12B. That is, in this case, the low angle side of the side lobes elevated characteristics deteriorate. This is because the area of ​​the planar antenna becomes small.
[0047]
　At this time, when one one side of the antenna unit 10 (square), one side of the notches 52 and 53 (square) is 1.5. In other words, each of the notches 52 and 53, has a quarter of the area of ​​the square area formed by arranging nine antenna units 10.
[0048]
　11, from the results shown in FIG. 12, in the planar antenna according to the present embodiment, each of the notches 52 and 53 square area (second square) is arranged nine antenna units 10 (first it is preferable to be 1/36 or more 1/9 or less of the area of ​​the square). At this time, the upper limit of the area of ​​each of the notches 52 and 53 corresponds to the area of ​​one antenna unit 10.
[0049]
　Further, in the present embodiment, as shown in FIG. 13A, the center portion of the rectangle 61 may be a planar antenna 5 of carefully shape the hollowed in square 62. In other words, it may be a center of the square 61 is carefully hollowed by a rectangle 62 of similar shape with the square 61 shape. At this time, the diagonals of each rectangle 61 to be parallel to each the x-axis and y-axis directions. Again, the planar antenna 5 may be constructed by combining a plurality of antenna units of square plurality of antenna elements are arranged. For example, the planar antenna 5 may be constructed by arranging the eight antenna units 63 to the four sides of the square.
[0050]
　As shown in FIG. 13A, the electric field distribution in the aperture plane of the planar antenna (x-axis direction) is lower at both ends of the x-axis direction. Also comprises Looking for sidelobe shown in FIG. 13B, a gain in radiation angle 0-90 ° is below the standard value, good sidelobe characteristics. Since the planar antenna 5 shown in Figure 13A the central portion is carefully counterbores in a square shape, it is possible to store the mechanical components and the radio apparatus in this portion.
[0051]
　Next will be described a comparative example of the present invention.
　For planar antennas 101 shown in FIG. 14A, that is, if each side of the rectangular planar antenna 101 is arranged to be parallel to the x-axis direction or y-axis direction, the electric field distribution in the aperture plane of the planar antenna ( x-axis direction) is a square shape. That is, the electric field distribution in the aperture plane is high at both ends of the x-axis direction. In this case, as shown in FIG. 14B, the gain of the radiation angle of 0 ° to 90 ° is above the standard value, overall sidelobe characteristics are deteriorated.
[0052]
　For planar antennas 102 shown in FIG. 15A, that is, if the diagonals each of the rectangular planar antenna 102 is arranged to run in parallel to each other and the x-axis direction and the y-axis direction, the electric field distribution in the aperture plane of the planar antenna (x-axis direction) is lower at opposite end portions of the x-axis direction. Also comprises Looking for sidelobe shown in FIG. 15B, the gain of the radiation angle of 0 ° to 90 ° is below the standard value, good sidelobe characteristics. The shape of the planar antenna shown in FIG. 15A corresponds to the shape before providing the cutout portions 12 and 13 to the planar antenna 1 according to this embodiment. In the case of the planar antenna shown in FIG. 15A, the gain of the planar antenna becomes discrete, it can not solve the problems of the present invention described above.
[0053]
　Like the planar antenna 103 shown in FIG. 16A, instead of providing the notches in the corners of a square, rectangle (square, each diagonal are arranged in parallel respectively and x and y-axis directions) If provided with opposed notches 112 and 113 into two sides, the electric field distribution in the aperture plane of the planar antenna (x-axis direction) is higher at the central portion. Looking at the side lobe characteristics of this case, as shown in FIG. 16B, and the gain in the low angle side exceeds the standard value, also generally sidelobe becomes high. Thus, it can be said that does not include a sufficient side lobe characteristics.
[0054]
　Moreover, as the planar antenna 104 shown in FIG. 17A, a square two opposing sides in the cutouts (each rectangle diagonals are arranged in parallel respectively with the x-axis direction and the y-axis direction) 112, 113 If the provided (shapes of the y-axis symmetry as shown in FIG 16A), the electric field distribution in the aperture plane of the planar antenna (x-axis direction) is higher at the central portion. Looking at the side lobe characteristics of this case, as shown in FIG. 17B, and the gain in the low angle side exceeds the standard value, also generally sidelobe becomes high. Thus, it can be said that does not include a sufficient side lobe characteristics.
[0055]
　Like the planar antenna 105 shown in FIG. 18A, a square case of providing the cutout portions 112 and 113 on the left and right sides of (each side arranged square to be parallel to the x-axis direction or y-axis direction) , electric field distribution of the aperture plane of the planar antenna (x-axis direction) is increased at both ends and the central portion of the x-axis direction. Looking at the side lobe characteristics of this case, as shown in FIG. 18B, overall gain exceeds the standard value, the sidelobe characteristics are worse than in the case shown in FIG. 16, FIG. 17.
[0056]
　Also, as in the planar antenna 106 shown in FIG. 19A, a square provided with notches 112 and 113 on upper and lower sides of the (each side square is arranged parallel to the x-axis direction or y-axis direction) If the field distribution of the aperture plane of the planar antenna (x-axis direction) is increased at both ends of the x-axis direction. Looking at the side lobe characteristics of this case, as shown in FIG. 19B, overall gain exceeds the standard value, the sidelobe characteristics are worse than in the case shown in FIG. 18.
[0057]
　Like the planar antenna 107 shown in FIG. 20A, when the shape of the planar antenna in a cross shape, in other words, square (rectangle sides are arranged parallel to the x-axis direction or y-axis direction) 4 for One corner all cut the portion lacking shape, electric field distribution of the aperture plane of the planar antenna (x-axis direction) is higher in the central portion of the x-axis direction. Looking at the side lobe characteristics of this case, as shown in FIG. 20B, overall gain sidelobe exceeds the standard value is poor.
[0058]
　Moreover, as the planar antenna 108 shown in FIG. 21A, when the shape of the planar antenna in a cross shape (for the shape of the planar antenna 107 is rotated 45 degrees as shown in FIG. 20A), the electric field of the opening face of the flat antenna distribution (x-axis direction) is increased at two points in the x-axis direction. Looking at the side lobe characteristics of this case, as shown in FIG. 21B, overall gain is increased, not good sidelobe characteristics. The shape of the planar antenna 108, in other words, square all cutaway shape as represent four corners of the (each rectangle diagonals are arranged in parallel respectively with the x-axis direction and the y-axis direction) can do.
[0059]
　For planar antennas 109 shown in FIG. 22A, that is, if each side of the rectangular planar antenna 109 is arranged to be parallel to the x-axis direction or y-axis direction, the electric field distribution in the aperture plane of the planar antenna ( x-axis direction) is a square shape. That is, the electric field distribution in the aperture plane is high at both ends of the x-axis direction. The planar antenna 109 shown in FIG. 22A corresponds to the larger shape the area of ​​the plane antenna 101 shown in FIG. 14A.
[0060]
　In this case, as shown in FIG. 22B, the gain of the radiation angle of 0 ° to 90 ° is above the standard value, overall sidelobe characteristics are deteriorated. As shown in FIG. 22B, the side lobe characteristic of the planar antenna 109 is null pitch is finer than the side lobe characteristics of the planar antenna 101 shown in FIG. 14A becomes envelope similar. In addition, the thickness of the main beam is narrowed.
[0061]
　For planar antennas 110 shown in FIG. 23A, that is, if each of the diagonal of a square planar antenna 110 is arranged to run in parallel to each other and the x-axis direction and the y-axis direction, the electric field distribution in the aperture plane of the planar antenna (x-axis direction) is lower at both ends of the x-axis direction. The planar antenna 110 shown in FIG. 23A corresponds to the larger shape the area of ​​the plane antenna 102 shown in FIG. 15A.
[0062]
　In this case, as shown in FIG. 23B, the gain of the radiation angle of 0 ° to 90 ° is below the standard value, with good sidelobe characteristics. The shape of the planar antenna shown in FIG. 23A corresponds to the shape before providing the cutout portions 12 and 13 to the planar antenna 1 according to this embodiment. In the case of the planar antenna shown in FIG. 23A, the gain of the planar antenna becomes discrete, it can not solve the problems of the present invention described above.
[0063]
　Although the present invention has been described with reference to the embodiments, the present invention is not limited by the foregoing. Configuration and details of the present invention, it is possible to make various modifications that those skilled in the art can understand within the scope of the invention.
[0064]
　This application claims priority based on Japanese Patent Application No. 2014-214459 filed on October 21, 2014, the entire disclosure of which is incorporated herein.
DESCRIPTION OF SYMBOLS
[0065]
1,2,3,4,5 flat antenna
10 antenna units
11 square
12,13,17,18 cut-out portion
21 first unit
22 second unit
30, 35 antenna units
31 dielectric substrate
32 antenna elements
33, 44, 45 and 46 micro-strip line (power supply circuit)
36,41,42 contacts
43 feeding point

The scope of the claims
[Claim 1]
　A plurality of planar antenna antenna elements are arranged,
　the plane antenna (the N 4 or more even number) N polygon is a shape in which two corners facing each other of the corner portions of is vital respectively cutting characterized in that,
　the planar antenna.
[Claim 2]
　The N polygon is a square, planar antenna according to claim 1.
[Claim 3]
　The planar antenna is a second square two corners facing each other of the four corners first square is provided having a 1/36 or 1/9 less of the area of ​​the area of ​​the first square each having a cutting-away shape, the planar antenna according to claim 2.
[Claim 4]
　The planar antenna, the plurality of antenna elements are constituted by combining a plurality of antenna units of square arranged, planar antenna according to claim 2 or 3.
[Claim 5]
　The planar antenna includes a first unit arranged with four of the antenna unit in a square, and the second unit of the three of the antenna units arranged in an L-shape, it comprises a,
　the second unit recess of the second unit is arranged to interface with one corner of the first unit,
　the planar antenna according to claim 4.
[Claim 6]
　A plurality of planar antenna antenna elements are arranged,
　the plane antenna, characterized in that it is in the form of an octagon having a two interior angle of 90 ° interior angles 6 and 270 degrees, the planar antenna.
[Claim 7]
　The octagon is axisymmetrical with respect to the two axes of symmetry, the two axes of symmetry, characterized in that mutually orthogonal, planar antenna according to claim 6.
[8.]
　A planar antenna in which a plurality of antenna elements are arranged,
　wherein the planar antenna has a shape central portion of the square is carefully hollowed in a square shape,
　a planar antenna.
[Claim 9]
　The planar antenna has a center portion of the rectangle is carefully hollowed a square shape similar with the square shape, the planar antenna according to claim 8.
[Claim 10]
　The planar antenna, the plurality of antenna elements are constituted by combining a plurality of antenna units of square arranged, planar antenna according to claim 8 or 9.