JP2019087942A - Frequency sharing array antenna - Google Patents

Abstract

To provide a frequency sharing antenna capable of maintaining the electrical characteristics of the existing frequency band while changing a part of the existing configuration, newly adding a plurality of antennas, and suppressing an increase in the overall size.SOLUTION: A frequency sharing array antenna A2 includes a first antenna element array including a first sub-array in which a plurality of pairs of vertical polarization dipole elements 10 resonating in a first frequency band are arranged and a second sub-array in which one or more vertical polarization dipole single elements 13 resonating in the first frequency band are arranged, a second antenna element array in which a plurality of horizontal polarization dipole elements 20 resonating in the first frequency band are arranged, a third antenna element array in which a plurality of polarization sharing elements 30 resonating in a second frequency band are arranged, and a fourth antenna element array in which a plurality of polarization sharing elements 40 resonating in a third frequency band are arranged.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a frequency shared array antenna.

  In order to cope with the increase in communication capacity in mobile communication, a plurality of frequency bands are allocated to the mobile communication system, and addition of new frequency bands is expected in the future. Also, MIMO (Multi-Input Multi-Output) communication, which uses multiple antennas for transmission and reception to increase channel capacity, has become commonplace.

  Also in a base station for mobile communication, it is necessary to install an antenna corresponding to a plurality of frequency bands. However, since the installation space is limited, it has become essential to share multiple frequency bands by arranging and sharing an antenna corresponding to each frequency band in one antenna cover. For example, an example of a frequency shared antenna is described in Patent Document 1. In addition, in order to perform MIMO communication, it is required to include a plurality of antennas corresponding to a certain frequency band. An example of MIMO communication is described in Non-Patent Document 1. Also from the viewpoint of installation space, it is desirable to place multiple antennas within one antenna cover.

JP, 2008-153967, A

The Institute of Electronics, Information and Communication Engineers, "Antenna Engineering Handbook", Second Edition, Ohm Co., Ltd., July 25, 2008, p. 521

  The present invention adds a plurality of new antennas while maintaining the electrical characteristics of the existing frequency band while changing a part of the existing configuration, and can further suppress the increase in overall size. Intended to be provided.

  In order to achieve the above object, a frequency sharing array antenna according to the present invention comprises a first antenna element array, a second antenna element array, a third antenna element array, and a fourth antenna element array. . The first antenna element array is formed by vertically arranging a plurality of vertical polarization dipole elements resonating in a first frequency band. The first antenna element array has a first subarray and a second subarray. The first sub-array is formed by vertically arranging a plurality of vertically polarized dipole element pairs composed of two vertically polarized dipole single elements spaced in the horizontal direction. The second sub array is vertically adjacent to the first sub array, and at least one vertically polarized dipole single element is vertically arranged. In the second antenna element array, the plurality of horizontal polarization dipole elements resonating in the first frequency band do not overlap with the first antenna element array in the vicinity of the first antenna element array. In the vertical direction. The third antenna element array resonates in a second frequency band, and a plurality of polarization sharing elements sharing two different polarizations are provided in the vicinity of the first sub array and the first sub array and the first sub array It is vertically arrayed so as not to overlap with the second antenna element array. The fourth antenna element array resonates in a third frequency band, and a plurality of polarization sharing elements sharing two different polarizations are present in the vicinity of the second sub array and the second sub array and the second sub array. It is vertically arrayed so as not to overlap with the second antenna element array.

  According to the present invention, it is possible to add a plurality of new antennas while suppressing the increase in the overall size while maintaining the electrical characteristics of the existing frequency band while changing a part of the existing configuration. An antenna can be provided.

It is a perspective view showing a frequency shared array antenna concerning a 1st embodiment. It is a side view showing a frequency shared array antenna concerning a 1st embodiment. It is a front view showing a frequency shared array antenna concerning a 1st embodiment. It is explanatory drawing which shows the directivity in a horizontal surface about 0.8 GHz band. It is explanatory drawing which shows the directivity in a horizontal surface about 2 GHz band. It is a perspective view which shows the frequency shared array antenna which concerns on 2nd Embodiment. It is a side view showing a frequency shared array antenna concerning a 2nd embodiment. It is a front view which shows the frequency shared array antenna which concerns on 2nd Embodiment. It is a bottom view which shows the frequency shared array antenna which concerns on 2nd Embodiment. It is explanatory drawing which shows the directivity in a horizontal surface about 0.8 GHz band. It is explanatory drawing which shows the directivity in a horizontal surface about 3.5 GHz band. It is a perspective view which shows the frequency shared array antenna which concerns on a 1st comparative example. It is a side view showing a frequency shared array antenna concerning the 1st comparative example. It is a front view which shows the frequency shared array antenna which concerns on a 1st comparative example. It is explanatory drawing which shows the directivity in a horizontal surface about 3.5 GHz band. It is a perspective view which shows the frequency shared array antenna which concerns on a 2nd comparative example. It is a side view showing a frequency shared array antenna concerning the 2nd comparative example. It is explanatory drawing which shows the directivity in a horizontal surface about 3.5 GHz band. It is a perspective view which shows the frequency shared array antenna which concerns on 3rd Embodiment. It is a side view showing a frequency shared array antenna concerning a 3rd embodiment. It is a bottom view which shows the frequency shared array antenna concerning 3rd Embodiment. It is a perspective view which shows the frequency shared array antenna which concerns on 4th Embodiment. It is a side view showing a frequency shared array antenna concerning a 4th embodiment. It is a front view showing a frequency shared array antenna concerning a 4th embodiment. It is explanatory drawing which shows the directivity in a horizontal surface about 0.8 GHz band. It is explanatory drawing which shows the directivity in a horizontal surface about 2 GHz band.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited by the following embodiments. In the drawings, the x-axis extends in the left-right direction of the antenna, and the right direction is a positive direction. The y-axis extends in the front-rear direction of the antenna, with the front as the positive direction. The z-axis extends in the vertical direction, with the upper direction as the positive direction.

First Embodiment
1 to 3 show a frequency sharing array antenna A1 according to the present embodiment. The shared-frequency array antenna A1 includes a first antenna element array, a second antenna element array, and a third antenna element array.

The first antenna element array is formed by arranging a plurality of vertically polarized dipole element pairs 10 resonating in a first frequency band in the vertical direction. Vertical polarization dipole element pair 10 is composed of a horizontal disposed vertically spaced S ₁ to have been two vertically polarized dipole single element 11 and 12. In the two vertical polarized wave dipole element pair 10 adjacent in the vertical direction, the interval between the centers is D _1.

The second antenna element array is formed by arranging a plurality of horizontally polarized dipole elements 20 arranged in the vertical direction, which resonate in a first frequency band. The second antenna element array is provided in the vicinity of the first antenna element array and in a form not to overlap with the first antenna element array. Here, “do not overlap” means that the antenna elements that form the first antenna element array and the antenna elements that form the second antenna element array do not intersect in the projection on the xz plane. is there. In the following, the terms "overlap" and "not overlap" are used in the same meaning as this. The distance between the two horizontal polarization dipole elements 20 adjacent in the vertical direction is D _2.

The third antenna element array is formed by arranging a plurality of vertical and horizontal polarization combined dipole elements 30 resonating in a second frequency band in the vertical direction. The third antenna element array is provided in the vicinity of the first and second antenna element arrays and in a form not to overlap with the first and second antenna element arrays. The vertical / horizontal polarization shared dipole element 30 includes a horizontal polarization dipole element 31 disposed horizontally and a vertical polarization dipole element 32 disposed vertically. The horizontally polarized dipole element 31 and the vertically polarized dipole element 32 are provided so as to cross each other. In two perpendicular horizontal polarization shared dipole elements 30 adjacent in the vertical direction, the interval between the centers is D _3.

  The shared-frequency array antenna A1 further accommodates the first reflector R1 disposed on the back of the first to third antenna element arrays, and the first to third antenna element arrays and the first reflector R1. A substantially cylindrical cover C is provided. The left and right direction both end portions of the first reflection plate R1 are bent toward the antenna front side, and when viewed in the vertical direction, the first reflection plate R1 is formed in a substantially U shape as a whole.

As an example, the first frequency band is assumed to be 0.7 / 0.8 GHz, and the second frequency band is assumed to be 1.5 / 1.7 / 2 GHz. Then, a wavelength at the center frequency of the first frequency band and lambda _1, the wavelength of the central frequency in the second frequency band and lambda _2.

In the first antenna element array, the length _{W 1} of about 0.45Ramuda ₁ vertically polarized dipole single element 11 and 12, the distance _{H 1} from the first reflector R1 of about 0.15Ramuda ₁ is there. Further, the spacing _{S 1} is approximately 0.32Ramuda _1, the distance _{D 1} is about 0.67λ _1.

In the second antenna element array, the length _{W 2} of the horizontally polarized dipole element 20 is about 0.45Ramuda _1, the distance of _{H 2} from the first reflector R1 is about 0.18Ramuda _1. Further, the distance _{D 2} is about 0.67λ _1.

In the third antenna element array, the length W ₃ of about 0.41Ramuda ₂ horizontally polarized dipole elements 31 and the vertical polarized wave dipole elements 32, the distance H ₃ from the first reflector R1 about is 0.24λ _2. Also, the interval _{D 3} is about 0.75? _2.

Width _{W R1} of the first reflector R1 is about 0.5 [lambda _1. Distance _{H C} of the first reflector R1 and the cover C is about 0.27Ramuda _1.

  4A and 4B show the directivity in the horizontal plane of vertical polarization and horizontal polarization in the 0.8 GHz band, respectively, in the frequency sharing array antenna A1 as described above. 5A and 5B show the directivity in the horizontal plane of vertical polarization and horizontal polarization in the 2 GHz band, respectively. According to the frequency shared array antenna A1, there is no distortion in any of both frequency bands, and directivity in the horizontal plane with a sufficient beam width can be obtained.

Second Embodiment
6 to 9 show a frequency sharing antenna A2 according to the present embodiment. The shared-frequency array antenna A2 includes a first antenna element array, a second antenna element array, a third antenna element array, and a fourth antenna element array.

The first antenna element array is formed by vertically arranging a plurality of vertical polarization dipole elements resonating in a first frequency band, and has a first subarray and a second subarray. The first sub-array is formed by arranging a plurality of vertical polarization dipole element pairs 10 in the vertical direction. Vertical polarization dipole element pair 10 is composed of a horizontal disposed vertically spaced S ₁ to have been two vertically polarized dipole single element 11 and 12.

  The second sub array is vertically adjacent to the first sub array, and at least one (two in this example) vertically polarized dipole single elements 13 are vertically arranged. The vertically polarized dipole single element 13 is disposed on an imaginary line which is equidistant from the vertically polarized dipole single elements 11 and 12 and extends in the vertical direction.

In the two vertical polarized wave dipole element pair 10 adjacent in the vertical direction, the interval between the centers is D _1. Also, in the vertically adjacent dipole element pair 10 for vertical polarization in the first sub-array and the vertical polarization dipole single element 13 in the second sub-array, the vertical distance between both centers is also It is D ₁ . Furthermore, in the two vertically polarized dipole single elements 13 adjacent in the vertical direction, the distance between centers is also D ₁ .

  The details of the second antenna element array are omitted because they are the same as in the case of the frequency sharing antenna A1.

  The third antenna element array is provided in the vicinity of the first sub array. The other points are omitted because they are the same as in the case of the frequency sharing antenna A1.

The fourth antenna element array has a third sub-array SA3 (located on the left side in the left-right direction) and a fourth sub-array SA4 (located on the right side in the left-right direction) horizontally adjacent to each other. Both subarrays resonate in the third frequency band, and a plurality of polarization sharing elements 40 sharing two different polarizations are vertically arranged. Also, both subarrays are provided in the vicinity of the second subarray and in a form not to overlap with the second subarray and the second antenna element array. A third sub-array SA3 Horizontal distance between the fourth sub-array SA4 is _{S 4.} Both subarrays are positioned such that their distances to the virtual line are equal.

The polarization sharing element 40 includes a + 45 ° polarization dipole element 41 and a −45 ° polarization dipole element 42. The + 45 ° polarization dipole element 41 and the −45 ° polarization dipole element 42 are provided to intersect with each other. In the two dual-polarized element 40 adjacent in the vertical direction, the interval between the centers is D _4. By using the third sub array SA3 and the fourth sub array SA4 as different antenna systems, two systems of antennas having the same characteristics with respect to the third frequency band are configured. Power feeding can be performed separately for each system.

  The frequency sharing antenna A2 further includes a first reflecting plate R1 provided on the back of the first to fourth antenna element arrays, a front surface of the first reflecting plate R1, and a third subarray SA3 and a fourth subarray SA4. And a second reflector R2 provided on the back of each of The left and right direction both end portions of the second reflection plate R2 are bent toward the antenna front side, and when viewed in the vertical direction, the second reflection plate R2 is formed in a substantially U shape as a whole. A spacer (not shown) is provided between the first reflection plate R1 and the second reflection plate R2.

As an example, the third frequency band and 3.5GHz band, the wavelength of the center frequency in the third frequency band and lambda _3. The first frequency band and the second frequency band are the same as described above.

In the fourth antenna element array, + 45 ° length _{W 4} of the polarized wave dipole elements 41 and -45 ° polarized wave dipole elements 42 is about 0.46λ _3, the distance from the second reflector R2 H ₄ is about 0.21λ _3. Further, the spacing _{S 4} is about 1.2Ramuda _3, the distance _{D 4} is about 0.55λ _3.

The width _{W R2} of the second reflector R2 is approximately 0.8λ _3. The distance _{H C} about 1.2Ramuda ₃ of the first reflector R1 and the cover C, the distance _{H R} of the first reflector R1 and the second reflector R2 is about 0.06 _3. In addition, the numerical value showing the dimension and space | interval of the antenna described until now is only an example, and setting to another numerical value is also possible.

  In the frequency sharing array antenna A2 as described above, FIGS. 10 (a) and 10 (b) show the directivity in the horizontal plane of the vertical polarization and the horizontal polarization in the 0.8 GHz band, respectively. 11A and 11B respectively show the directivity in the horizontal plane of + 45 ° polarization and −45 ° polarization of the left system (third sub-array SA3) in the 3.5 GHz band. Further, FIGS. 11C and 11D show the directivity in the horizontal plane of the + 45 ° polarization and the −45 ° polarization of the right system (fourth sub-array SA4) in the 3.5 GHz band, respectively.

  From the comparison between FIG. 4 and FIG. 10, according to the frequency sharing antenna A2, substantially the same characteristics as the frequency sharing antenna A1 are obtained with respect to the directivity in the horizontal plane of the 0.8 GHz band. The third antenna element array resonating in the second frequency band does not differ in configuration through the frequency sharing array antennas A1 and A2. Therefore, it is clear that the horizontal direction directivity can obtain the same characteristic as that of FIG. As shown in FIG. 11, in the horizontal plane directivity in the 3.5 GHz band, substantially the same characteristics are obtained in the left and right systems.

  According to the frequency sharing array antenna A2, interference with the antenna elements in the first and second frequency bands is suppressed, and the possibility of deterioration of the electrical characteristics such as voltage standing wave ratio (VSWR) and directivity is also reduced. It is possible to arrange two systems of antennas having the same characteristics, corresponding to the new third frequency band.

  In addition, when a new frequency band is added, an antenna element corresponding to the frequency band can be provided vertically adjacent to an antenna element corresponding to the existing frequency band. However, in that case, the vertical size of the entire antenna increases. On the other hand, the frequency sharing antenna A2 has substantially the same size as the frequency sharing antenna A1. That is, it is possible to cope with a new frequency band while suppressing an increase in the size of the entire antenna.

  Further, according to the frequency shared array antenna A2, there is no distortion in any of the first to third frequency bands, and directivity in the horizontal plane with a sufficient beam width can be obtained.

[First comparative example]
12 to 14 show a frequency sharing array antenna CP1 according to this example. The frequency sharing array antenna CP1 is obtained by replacing the vertically polarized dipole single element 13 in the second sub-array of the frequency shared array antenna A2 with a vertically polarized dipole element pair 10. The two vertically polarized dipole single elements 11 and 12 constituting the vertically polarized dipole element pair 10 are positioned so as to overlap with each other in front of the third sub array SA3 and the fourth sub array SA4, respectively. The other configuration is the same as that of the frequency sharing array antenna A2, and thus the description thereof is omitted.

  In the frequency sharing array antenna CP1 as described above, the horizontal planes of + 45 ° polarization and -45 ° polarization of the left system (third sub array SA3) in the 3.5 GHz band in FIGS. Indicates inward directivity. Further, in the figures (c) and (d), the directivity in the horizontal plane of + 45 ° polarization and −45 ° polarization of the right system (fourth sub-array SA4) in the 3.5 GHz band is shown.

As apparent from the comparison with FIG. 11, distortion occurs in the directivity in the horizontal plane shown in FIG. This is because the first antenna element array is positioned in front of the fourth antenna element array. The length W ₁ of the vertically polarized dipole single element of the first antenna element array is about 2.0Ramuda ₃ in terms of the wavelength lambda _3, clearly longer than the wavelength lambda _3. That is, the vertically polarized dipole single element in the first antenna element array operates as a reflector in the third frequency band, and the radiation of radio waves by the fourth antenna element array is disturbed.

  On the other hand, in the frequency sharing array antenna A2, the fourth antenna element array is positioned so as not to overlap the first antenna element array. Therefore, there is obtained an effect that no distortion occurs in the directivity of the third frequency band added to the frequency sharing antenna.

Second Comparative Example
16 and 17 show a frequency sharing array antenna CP2 according to this example. Unlike the frequency shared array antenna A2, the frequency shared array antenna CP2 does not include the second reflecting plate R2. The other configuration is the same as that of the frequency sharing array antenna A2, and thus the description thereof is omitted.

  In (a) and (b) in FIG. 18A, in the frequency sharing array antenna CP2, directivity in the horizontal plane of + 45 ° polarization and −45 ° polarization of the left system (third sub array SA3) in the 3.5 GHz band is Show. Further, in the figures (c) and (d), the directivity in the horizontal plane of + 45 ° polarization and −45 ° polarization of the right system (fourth sub-array SA4) in the 3.5 GHz band is shown.

  As shown in the figure, left-right asymmetry distortion occurs in the directivity in the horizontal plane. This is also apparent from the comparison with the directivity of the frequency sharing antenna A2 shown in FIG. As this factor, it is mentioned that the fourth antenna element array is influenced by the first reflection plate R1 because the second reflection plate R2 is not installed in the frequency shared array antenna CP2.

For both systems the fourth antenna element array, the position of the lateral direction are offset by 0.5S ₄ from the left and right direction center of the first reflector R1, respectively. This deviation is a factor that the directivity in the horizontal plane is not symmetrical.

In addition, since the width WR1 of the first reflecting plate R1 is a value set to make the first and second frequency bands have the desired directivity in the horizontal plane, the width W _R1 is not necessarily for the third frequency band. It can not be said that it is the best. In particular, if the third frequency band is 3.5GHz band as described above, since width _{W R1} of the first reflector R1 for the wavelength lambda ₃ is a 2.2Ramuda _3, Horizontal Pattern The beam width of

  On the other hand, in the frequency sharing antenna A2, second reflecting plates R2 are provided on both the left and right systems of the fourth antenna element array. Therefore, the directivity in the horizontal plane is symmetrical and a desired beam width (about 65 ° in this example) can be obtained (FIG. 11).

Third Embodiment
19 to 21 show a frequency sharing antenna A3 according to the present embodiment. The frequency shared array antenna A3 includes a partition plate PL in place of the second reflection plate R2 of the frequency shared antenna A2. The partition plate PL is connected to the first reflection plate R1, extends substantially in the front direction, and is provided on the left and right sides, ie, both sides in the horizontal direction of each of the third sub array SA3 and the fourth sub array SA4. The other configuration is the same as that of the frequency sharing antenna A2, and thus the description thereof is omitted.

  The partition plate PL has an action equivalent to that of the second reflection plate R2. Therefore, also in the frequency sharing antenna A3, it is possible to obtain the same characteristics as the frequency sharing antenna A2.

Fourth Embodiment
22 to 24 show a frequency sharing antenna A4 according to the present embodiment. In the frequency sharing array antenna A4, the third antenna element array has two adjacent subarrays spaced S ₃ in the horizontal direction. Each sub array is formed by arranging a plurality of vertical and horizontal polarization combined dipole elements 30 resonating in the second frequency band in the vertical direction. Both subarrays are positioned such that the distances to the virtual lines are equal. The purpose of providing two sub-arrays is to narrow the directivity in the horizontal plane by the third antenna element array.

The distance between the fourth antenna element array and the cover C while providing the first reflecting plate R1 further to the rear as the number of antenna elements included in the third antenna element array is increased compared to the frequency sharing antenna A2. In some cases, it may be desirable to match that of the frequency sharing antenna A2. Therefore, the first reflector R1, between the third antenna element array in a region corresponding to the region and the fourth antenna element array corresponding stepped portion ST is provided with a step H _R1.

  The other configuration of the frequency sharing antenna A4 is the same as that of the frequency sharing antenna A2, and thus the description thereof is omitted.

As an example, the spacing _{S 3} is 0.54λ _2. In the first reflector R1, a region corresponding to the third antenna element array R1a (region of above the stepped portion ST), the distance _{H C} of the cover C is about 1.3Ramuda _3. Step _{H R1} is approximately 0.12λ _3. In the first reflector R1, a region corresponding to the fourth antenna element array R1b (region lower than the step portion ST), the distance _{H R2} between the second reflector R2 is about 0.06 ₃ .

  In the frequency sharing antenna A4 as described above, FIGS. 25A and 25B show directivity in the horizontal plane of vertical polarization and horizontal polarization in the 0.8 GHz band. From the figure, the beam width is about 80 ° as in the case of the frequency sharing antenna A2 (FIG. 10).

  FIGS. 26A and 26B show the directivity in the horizontal plane of vertical polarization and horizontal polarization in the 2 GHz band. The beam width is about 45 °, and narrow characteristics are obtained as compared with the case of the frequency sharing antennas A1 and A2 (FIG. 5).

  In the third frequency band, since the configuration is the same as that of the frequency sharing antenna A2, it is apparent that the same characteristics can be obtained. That is, according to the frequency sharing antenna A4, the characteristics of the third frequency band can be maintained regardless of the configuration of the third antenna element array corresponding to the second frequency band.

[Others]
Although specific embodiments of the present invention have been described, the present invention is not limited to such embodiments, and various modifications based on the technical idea of the present invention are included in the concept of the present invention.

  For example, in the above embodiment, dipole antenna elements are used for the third antenna element array and the fourth antenna element array, but other antenna elements such as a patch antenna element can also be used.

  Further, as the third antenna element array, not only the vertical / horizontal polarization shared antenna element but also a ± 45 ° polarization shared antenna element can be used. Furthermore, as the fourth antenna element array, not only the ± 45 ° polarization shared antenna element but also the vertical / horizontal polarization shared antenna element can be used.

  A passive element for adjusting directivity and voltage standing wave ratio (VSWR) may be provided in front of the antenna elements constituting each of the antenna element arrays.

  The left and right direction both end portions of the first and second reflecting plates are not limited to the shape bent forward in a U-shape, and the bending direction and angle can be freely changed in order to obtain desired characteristics. Similarly to this, also for the partition plate, the attachment angle with the first reflection plate can be freely changed.

  The fourth antenna element array may be one instead of two.

  The frequency band of either 0.7 GHz band or 0.8 GHz band may be used as the first frequency band. Further, any one frequency band or any two frequency bands among the 1.5 GHz band, the 1.7 GHz band, and the 2 GHz band may be used as the second frequency band. The specific numerical value of the frequency is only an example.

10 Dipole elements for vertical polarization 11, 12 and 12 Dipole single elements for vertical polarization 13 Dipole single elements for vertical polarization

20 Horizontal polarization dipole element

30 Vertically Horizontally Polarized Shared Dipole Element 31 Horizontally Polarized Dipole Element 32 Vertically Polarized Dipole Element

40 Polarization sharing element 41 + 45 ° polarization dipole element 42 -45 ° polarization dipole element

R1 first reflection plate R2 second reflection plate PL partition plate ST step portion

Claims (10)

A first antenna element array in which a plurality of vertical polarization dipole elements resonating in a first frequency band are arranged in the vertical direction, and two horizontal polarization spaced vertical polarization A first sub-array in which a plurality of pairs of vertically polarized dipole elements consisting of a single dipole element are arranged in the vertical direction, and at least one vertically polarized dipole single element vertically adjacent to the first sub-array A first antenna element array having a second sub-array in which
A plurality of horizontal polarization dipole elements which resonate in the first frequency band are vertically arranged in the vicinity of the first antenna element array and in a form not overlapping the first antenna element array. A second antenna element array
A plurality of polarization sharing elements that resonate in a second frequency band and share two different polarizations are in the vicinity of the first sub array and overlap with the first sub array and the second antenna element array. A third array of antenna elements arranged in the vertical direction,
A plurality of polarization sharing elements that resonate in a third frequency band and share two different polarizations are in the vicinity of the second sub array and overlap with the second sub array and the second antenna element array And a fourth array of antenna elements arranged vertically in a non-conventional form.   The frequency shared array antenna according to claim 1, wherein the fourth antenna element array has two subarrays horizontally adjacent and having the same characteristic.   The frequency sharing array antenna according to claim 1, wherein the polarization sharing element constituting the third antenna element array is a dipole antenna element or a patch antenna element.   The frequency sharing array antenna according to any one of claims 1 to 3, wherein the polarization sharing element constituting the fourth antenna element array is a dipole antenna element or a patch antenna element. The polarization sharing element constituting the third antenna element array is
A polarization sharing element combining a vertically polarized antenna element and a horizontally polarized antenna element;
The frequency sharing array antenna according to any one of claims 1 to 4, which is any one of a polarization sharing element in which a +45 polarization antenna element and a -45 polarization element are combined. The polarization sharing element constituting the fourth antenna element array is
A polarization sharing element combining a vertically polarized antenna element and a horizontally polarized antenna element;
The frequency shared array antenna according to any one of claims 1 to 5, which is any one of a polarization sharing element in which a +45 polarization antenna element and a -45 polarization element are combined.   The frequency shared array antenna according to any one of claims 1 to 6, further comprising a first reflector on a back surface of the first to fourth antenna element arrays.   The frequency shared array antenna according to claim 7, further comprising a second reflection plate on the front surface of the first reflection plate and on the back surface of the fourth antenna element array.   The frequency shared array antenna according to claim 7, further comprising: a partition plate connected to the first reflection plate and extending substantially in front of the fourth antenna element array in the horizontal direction.   10. The method according to any one of claims 7 to 9, wherein in the first reflection plate, a step is provided between a region corresponding to the third antenna element array and a region corresponding to the fourth antenna element array. The frequency shared array antenna according to any one of the preceding claims.

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