JP5952718B2 - Antenna device and its reflector - Google Patents

Description

  The present invention relates to an antenna device for reflecting electromagnetic waves in a plurality of frequency bands individually to a plurality of reflectors, and the reflector.

  The present applicant has proposed an antenna device that can share a plurality of frequencies and has reduced installation space (see, for example, Patent Document 1). The antenna device includes a plurality of reflectors and an antenna element. The antenna element is formed for multi-frequency sharing or broadband operation that operates in a plurality of frequency bands, and performs communications such as transmission and reception of radio waves that are electromagnetic waves in a plurality of frequency bands. Further, the plurality of reflecting plates each reflect radio waves in at least one frequency band communicated by the antenna element as described above.

  In the antenna device of Patent Document 1, the above-described reflector is formed in a metamaterial structure. This metamaterial structure is formed in a periodic arrangement structure in which dielectrics made of prismatic or cylindrical wire rods are combined in a lattice shape at equal intervals at a distance sufficiently smaller than the frequency. Such a metamaterial-structured reflector has a negative dielectric constant due to an artificial periodic structure, and also has a band gap corresponding to the periodic interval of the lattice-like arrangement structure. Such a metamaterial-structured reflector can be easily manufactured as a macro component because, for example, when applied to radio waves having a frequency of 10 GHz or less, the dimensions of the wire made of a dielectric can be in units of several millimeters. can do.

  In the antenna device of Patent Document 1, each of the plurality of metamaterial-structured reflectors is formed in a shape that reflects radio waves in a desired at least one frequency band, and is located at a position corresponding to radio waves in a plurality of frequency bands. Has been placed. For this reason, in each of the reflectors having a plurality of metamaterial structures, the intervals between the plurality of dielectrics of the metamaterial structure are set to be the same as the ratio of the frequency bands of the plurality of reflected radio waves.

  In addition, in such a substantially square reflector having a plurality of metamaterial structures, the sizes of two substantially orthogonal sides are the same as the ratio of the frequency bands of the plurality of reflected radio waves. Furthermore, the number of metamaterial structure reflectors corresponding to the plurality of frequency bands are arranged in the direction of the radio waves to be transmitted and received so that the surface thereof is substantially orthogonal to the direction of the radio waves to be transmitted and received. The distances between the number of metamaterial structure reflectors corresponding to the plurality of frequency bands and the antenna elements are also arranged at the same ratio as the ratio of the plurality of frequency bands.

  For this reason, in the antenna device of Patent Document 1, the reflectors having a plurality of metamaterial structures form band gaps in a plurality of frequency bands. Such an antenna device, for example, can cover the same radio zone with a radiation pattern having the same beam width in a horizontal plane in a plurality of frequency bands, and thus is applied to a base station for land mobile radio communication. be able to. In addition, when the antenna device as described above is formed to the minimum, the distance between the reflectors of the plurality of metamaterial structures with respect to the antenna element is the same as the wavelength of the center frequency of the frequency band of the radio wave reflected by each. In addition, when the metamaterial structure reflector is formed in a square shape, one side of the reflector is the same as the wavelength of the center frequency of the frequency band of the radio wave reflected by each.

  In the antenna device as described above, the largest reflector can be formed of metal. When the antenna device is formed to the minimum, the metal reflector is also disposed at the same position as the wavelength of the center frequency of the frequency band of the reflected radio wave with respect to the antenna element together with the reflectors of the plurality of metamaterial structures. And when a metal reflector is also formed in a square, the side of the wavelength of the center frequency of the frequency band of the reflected radio wave is also made the same.

JP 2011-244136 A

  However, in the above-described antenna device, a plurality of reflectors are formed in a metamaterial structure. In such a metamaterial structure, as described above, dielectrics composed of prismatic or cylindrical wires are combined in a lattice shape. For this reason, it is difficult to form a reflection plate having a metamaterial structure, and its thickness cannot be ignored.

  Therefore, in the antenna device as described above, it is necessary to arrange the reflectors having a plurality of metamaterial structures having different frequency bands so that they do not come into contact with each other due to the plate thickness. For this reason, in order to arrange the reflectors having a plurality of metamaterial structures and the antenna elements at positions having the same ratio as the ratio of the plurality of frequency bands, there are limitations on combinations of the plurality of frequency bands.

  In particular, when the antenna device is formed to a minimum as described above, the distance between the reflectors of the plurality of metamaterial structures with respect to the antenna element needs to be the same as the wavelength of the central frequency of the frequency band of the radio wave reflected by each. . For this reason, when the ratio of the frequency to be shared is small, the reflectors of a plurality of metamaterial structures may interfere with each other and cannot be disposed at an appropriate position. Similarly, when a metal reflector is disposed together with a plurality of reflectors having a metamaterial structure, the reflector having the metamaterial structure may interfere with the metal reflector and may not be disposed at an appropriate position.

  The present invention has been made in view of the above-described problems, and a case where a plurality of metamaterial structure reflectors are arranged with respect to an antenna element at the same ratio as a ratio of a plurality of frequency bands to be used. However, the present invention provides an antenna device in which there is no restriction on the combination of a plurality of frequency bands.

  In order to solve the above-described problems, an antenna device according to the present invention includes an antenna element that communicates electromagnetic waves in a plurality of frequency bands, a plurality of reflecting plates that respectively reflect at least one electromagnetic wave in the frequency bands, and the antenna. A plurality of reflectors arranged at the same ratio as the ratio of the plurality of frequency bands to the element, and at least one of the reflectors is made of a dielectric. The metamaterial structure is formed, and at least one reflector of the metamaterial structure is formed in a shape that does not interfere with other adjacent reflectors.

  In the antenna apparatus as described above, as a further invention, at least one reflector of the metamaterial structure is formed in a shape in which a portion that interferes with another adjacent reflector is removed.

  In the antenna device as described above, as a further invention, one of the reflectors is made of metal and reflects an electromagnetic wave in one frequency band, and the plate arrangement means is arranged in order in the direction of the electromagnetic wave. The antenna element and the reflector having a metamaterial structure and the metal reflector are disposed.

  In the antenna device as described above, as a further invention, the reflection plate having one metamaterial structure is formed in a shape that does not interfere with the adjacent reflection plate made of metal.

  In the antenna device as described above, as a further invention, a plurality of the reflectors are similar in that the surfaces thereof are orthogonal to the direction of the electromagnetic wave, and the ratio of the plurality of frequency bands and the ratio of the mutual sizes are the same. It is formed into a shape.

  In the antenna device as described above, as a further invention, the plurality of reflectors are formed in a square having the same length as each wavelength and at least one of the electromagnetic waves reflected by each of the reflectors. The plurality of reflectors are arranged at a distance of at least one wavelength of the electromagnetic wave that each reflects from the antenna element.

  The reflector of the present invention is the reflector of the metamaterial structure of the antenna device of the present invention, and is adjacent to the antenna element even if disposed at the same ratio as the ratio of the plurality of frequency bands. It is formed in a shape that does not interfere with other reflectors.

  The various components of the present invention do not necessarily have to be independent of each other. A plurality of components are formed as a single member, and a single component is formed of a plurality of members. It may be that a certain component is a part of another component, a part of a certain component overlaps with a part of another component, or the like.

  Further, the term “orthogonal” as used in the present invention is only required to be orthogonal, and does not need to be strictly mathematically orthogonal, and allows a so-called tolerance. Furthermore, “similar shape” in the present invention means not “similar” “shape” but “similar shape” “shape”.

  In the antenna device of the present invention, the antenna element communicates electromagnetic waves in a plurality of frequency bands. The plurality of metamaterial reflectors each act as a frequency filter on electromagnetic waves in at least one frequency band. The plate arrangement means arranges a plurality of metamaterial reflectors in the direction of electromagnetic waves with respect to the antenna element. For this reason, in this antenna device, even when a plurality of metamaterial reflectors and antenna elements are arranged at the same ratio as the ratio of a plurality of frequency bands to be used, there is no restriction on the combination of the plurality of frequency bands. .

It is a typical side view which shows the structure of the antenna apparatus in embodiment of this invention. It is a perspective view which shows the assembly structure of the 1st and 2nd metamaterial reflector of the antenna device in embodiment of this invention. It is a perspective view which shows the structure of the 2nd metamaterial reflector of the antenna device in embodiment of this invention. In the antenna device according to the embodiment of the present invention, (a) is a characteristic diagram showing a radiation pattern in the horizontal plane of the first metamaterial reflector, and (b) is a radiation pattern in the horizontal plane of the second metamaterial reflector. FIG. It is a typical side view which shows the 1st modification of embodiment of the antenna apparatus in this invention. It is a perspective view which shows the assembly structure of the 1st and 2nd metamaterial reflector of the 1st modification of embodiment of the antenna apparatus in this invention. It is a typical side view which shows the 2nd modification of embodiment of the antenna apparatus in this invention. It is a perspective view which shows the assembly structure of the 1st and 2nd metamaterial reflector of the 2nd modification of embodiment of the antenna apparatus in this invention.

  An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, description will be made by defining the front-rear, left-right, up-down directions as shown. However, this is provided for the sake of convenience in order to briefly explain the relative relationship between the components. Therefore, the direction at the time of manufacture and use of the product which implements the present invention is not limited.

  As shown in FIGS. 1 to 3, the antenna device 100 according to the present embodiment includes one antenna element 110 and first and second metamaterial reflectors 121 and 122 that are reflectors having a plurality of metamaterial structures. And a metal reflector 130 which is a single metal reflector, and a plate arrangement member (not shown) which is a plate arrangement means. The antenna element 110 is formed in a multi-frequency shared type or a broadband type, and performs transmission and reception as communication of radio waves that are electromagnetic waves in a plurality of specific frequency bands. The first and second metamaterial reflectors 121 and 122 are formed in a metamaterial structure by combining dielectrics 121a and 122a such as linear rectangular parallelepiped ceramics in a grid pattern, and are radio waves in three frequency bands. One of them individually. One metal reflector 130 is formed of a flat plate made of metal such as copper, and reflects one of the radio waves in the three frequency bands. The plate arrangement member is formed of, for example, a magnetically permeable and insulative resin that does not affect radio waves and continuity, and the antenna element 110 and the first and second metamaterials in order from the front to the rear in the direction of the radio waves. Reflectors 121 and 122 and a metal reflector 130 are disposed.

  More specifically, in the antenna device 100 of the present embodiment, the metal reflector 130 and the first and second metamaterial reflectors 121 and 122 have their front surfaces that are surfaces orthogonal to the direction of the radio wave. The ratio of the plurality of frequency bands and the ratio of the mutual sizes are formed in a square having the same shape. For this reason, as shown in FIG. 1, the first metamaterial reflector 121 is formed in a square having one side L1, and reflects radio waves in a predetermined frequency band having a center frequency of 4 GHz. Further, the second metamaterial reflector 122 is formed in a square having one side L2, and reflects radio waves in a predetermined frequency band having a center frequency of 2 GHz. The metal reflector 130 is formed in a square shape having a side L3 and reflects radio waves in a predetermined frequency band having a center frequency of 800 MHz. The first and second metamaterial reflectors 121 and 122 and the metal reflector 130 are each an integral multiple of the wavelength of the center frequency of the radio wave reflected by each of the first and second metamaterial reflectors 121 and 122, and the sides L1 to L3 are 75 mm and 150 mm. , 375 mm.

  Furthermore, in the antenna device 100 of the present embodiment, the plate arrangement member uses the metamaterial reflectors 121 and 122 and the metal reflector 130 with respect to the antenna element 110 at the same ratio as the ratio of the three frequency bands of radio waves. It is arranged at the position. Therefore, as shown in FIG. 1, the first metamaterial reflector 121 is arranged at a distance S1 such as a quarter of the center wavelength of the frequency band of the reflected radio wave with respect to the antenna element 110. Yes. The second metamaterial reflector 122 is arranged at a distance S2 such as a quarter of the center wavelength of the frequency band of the reflected radio wave with respect to the antenna element 110. Metal reflector 130 is arranged at a distance S3 such as a quarter of the center wavelength of the frequency band of the reflected radio wave with respect to antenna element 110.

  However, since the first and second metamaterial reflectors 121 and 122 are formed in a metamaterial structure by combining linear rectangular parallelepiped dielectrics 121a and 122a in a grid pattern as described above, the front-rear direction Has a sufficient thickness that cannot be ignored. Then, the first and second metamaterial reflectors 121 and 122 are arranged at the same distances S1 and S2 as the center wavelength of the frequency band of the reflected radio wave with respect to the antenna element 110 as described above. Then, as shown in FIG. 1, the rear surface of the first metamaterial reflector 121 is positioned behind the front surface of the second metamaterial reflector 122.

  However, in the antenna device 100 of the present embodiment, the second metamaterial reflector 122 is a portion 122b that interferes with the first metamaterial reflector 121, which is another adjacent reflector, as shown in FIG. Is formed into a cut shape. For this reason, the second metamaterial reflector 122 is formed in a shape that does not interfere with the first metamaterial reflector 121. For example, in the case where the plate thickness is half of the center wavelength of the reflected radio wave, the first metamaterial reflector 121 has a plate thickness of 37.5 mm and a distance between the front surface and the antenna element 110 of 18.75 mm. Placed in. On the other hand, the second metamaterial reflecting plate 122 has a plate thickness of 75 mm and is disposed at a position where the distance between the front surface and the antenna element 110 is 37.5 mm. In this case, the rear surface of the first metamaterial reflector 121 is located behind the front surface of the second metamaterial reflector 122 by 18.75 mm. Therefore, a portion of 75 mm × 75 mm × 18.75 mm is excised from the front surface of the second metamaterial reflector 122 to the rear in the vertical and horizontal directions.

  Therefore, in antenna device 100 of the present embodiment, as described above, first and second metamaterial reflectors 121 and 122 have the same distance as the center wavelength of the frequency band of the radio wave reflected from antenna element 110. When arranged at the positions of S3 and S2, as shown in FIG. 2, the first metamaterial reflector 121 is arranged at the position of the cut portion 122b of the second metamaterial reflector 122. For this reason, the 1st and 2nd metamaterial reflectors 121 and 122 arrange | positioned in the position of the same distance S3 and S2 as the center wavelength of the frequency band of the electromagnetic wave reflected with respect to the antenna element 110 do not interfere.

  For example, when the antenna device 100 is large and manufactured by microfabrication, the second metamaterial reflector 122 having such a structure is a second metamaterial reflector 122 formed by combining a plurality of dielectrics 122a as in the prior art. A portion 122b that interferes with the first metamaterial reflector 121 may be excised from the metamaterial reflector 122 by machining such as precision cutting. Alternatively, the second metamaterial reflector 122 may be formed by combining the dielectric 122a having no portion 122b that interferes with the first metamaterial reflector 121 from the beginning. Furthermore, when the antenna device 100 is small and manufactured by thin film technology, a portion that interferes with the first metamaterial reflective plate 121 from the second metamaterial reflective plate 122 formed by thin film technology as in the conventional case. 122b may be eliminated by thin film technology such as photoetching. Alternatively, the second metamaterial reflector 122 may be formed by thin film technology in a shape that does not have a portion 122b that interferes with the first metamaterial reflector 121 from the beginning.

  In the actual antenna device 100, for example, a thin-film insulator (not shown) is provided in the minute gap between the first metamaterial reflector 121 and the second metamaterial reflector 122 arranged as described above. The first metamaterial reflector 121 and the second metamaterial reflector 122 are electrically insulated. Such an insulator can be formed, for example, as a part of a plate arrangement member made of resin enclosing the first and second metamaterial reflectors 121 and 122 and the metal reflector 130.

  4A is a characteristic diagram showing a radiation pattern in the horizontal plane of the first metamaterial reflector 121 of the antenna device 100 in the present embodiment, and FIG. 4B is the first diagram as described above. It is a characteristic view which shows the radiation pattern in the horizontal surface of the 2nd metamaterial reflector 122 which does not have the part 122b which interferes with the metamaterial 121 of FIG. As shown in FIG. 4A, the first metamaterial reflector 121 reflects a radio wave in a frequency band with a center frequency of 4 GHz, and uses the reflected radio wave as a directional beam. As shown in FIG. 4B, the second metamaterial reflector 122 is cut off at the front surface where the first metamaterial reflector 121 overlaps as described above, but the center frequency is still 2 GHz. The reflected radio wave is reflected as a directional beam.

  In the configuration as described above, in antenna device 100 of the present embodiment, antenna element 110 transmits and receives radio waves in three frequency bands having 4 GHz, 2 GHz, and 800 MHz as center frequencies. The first metamaterial reflector 121 reflects radio waves in a predetermined frequency band centered on 4 GHz to be transmitted and received, and the second metamaterial reflector 122 has a predetermined frequency centered on 2 GHz. Reflects radio waves in the band. The metal reflector reflects radio waves in a predetermined frequency band having a center frequency of 800 MHz. The plate arrangement member is composed of the first and second metamaterial reflectors 121 and 122 and one metal at the same ratio as the ratio of the three frequency bands centering on 4 GHz, 2 GHz, and 800 MHz as described above. The reflector 130 is disposed with respect to the antenna element 110.

  For this reason, the antenna device 100 of the present embodiment can satisfactorily transmit and receive radio waves in the three frequency bands having the center frequencies of 4 GHz, 2 GHz, and 800 MHz. However, the metamaterial reflectors 121 and 122 have a thickness that cannot be ignored in the front-rear direction due to the metamaterial structure. For this reason, when the first and second metamaterial reflectors 121 and 122 are arranged with respect to the antenna element 110 at the same ratio as the ratio of the frequency bands having the center frequencies of 4 GHz and 2 GHz as described above, the first The rear surface of the metamaterial reflector 121 is located behind the front surface of the second metamaterial reflector 122.

  However, in the antenna device 100 according to the present embodiment, as shown in FIG. 3, the second metamaterial reflector 122 is formed in a shape in which the front center portion 122b is cut out, as shown in FIGS. As shown in FIG. 2, the first metamaterial reflector 121 is disposed in the part 122b of the cut shape at the center of the front surface of the second metamaterial reflector 122. For this reason, even if the first and second metamaterial reflectors 121 and 122 are arranged with respect to the antenna element 110 at the same ratio as the ratio of the frequency band having the center frequency of 4 GHz and 2 GHz, the first and first The second metamaterial reflectors 121 and 122 do not interfere with each other. Therefore, in the antenna device 100 of the present embodiment, the first and second metamaterial reflectors with respect to the antenna element 110 are located at the same ratio as the ratio of the two frequency bands of the radio waves used as described above. Even when 121 and 122 are arranged, there is no restriction on the combination of the shared frequencies of radio waves to be used.

  In particular, in the antenna device 100 according to the present embodiment, as shown in FIG. 3, the second metamaterial reflector 122 is formed in a shape in which the front center portion 122 b is cut out, so that FIG. 1 and FIG. As shown, the first and second metamaterial reflectors 121 and 122 are arranged at overlapping positions without interference. For this reason, the 1st and 2nd metamaterial reflectors 121 and 122 can be arrange | positioned by the simple structure and process in the overlapping position, without making it interfere.

  Furthermore, in antenna apparatus 100 of the present embodiment, first and second metamaterial reflectors 121 and 122 with respect to antenna element 110 are located at the same ratio as the ratio of the three frequency bands of radio waves to be used. And the metal reflecting plate 130 is arrange | positioned. For this reason, each of the first and second metamaterial reflectors 121 and 122 can individually reflect two of the radio waves in the three frequency bands satisfactorily, and one metal reflector 130 has three One of the radio waves in one frequency band can be reflected well.

  In addition, in the antenna device 100 of the present embodiment, the metal reflector 130 and the first and second metamaterial reflectors 121 and 122 have surfaces whose surfaces are orthogonal to the direction of the radio wave, and three frequency bands of the radio wave. And the ratio of mutual sizes are formed in the same square. Therefore, in this antenna device 100, the ratio of the sizes of the three square metamaterial reflectors and the metal reflector 130 whose surface is orthogonal to the direction of the radio waves is the ratio of the three frequency bands of radio waves. Match. Therefore, each of the first and second metamaterial reflectors 121 and 122 can well reflect each of the two radio waves in the three frequency bands, and one metal reflector 130 includes three One of the radio waves in the frequency band can be reflected well.

  The present invention is not limited to the present embodiment, and various modifications are allowed without departing from the scope of the present invention. For example, in the above embodiment, the antenna device 100 performs transmission and reception as radio wave communication using the antenna element 110. However, the antenna device 100 may execute only transmission of radio waves or only reception by the antenna element 110.

  Moreover, in the said form, the 1st and 2nd metamaterial reflectors 121 and 122 arrange | positioned with respect to the antenna element 110 in the position of the ratio same as the ratio of the two frequency bands of the electromagnetic wave to utilize do not interfere. An example is shown in which the rear second metamaterial reflector 122 is formed in a shape in which the front portion 122b with which the first metamaterial reflector 121 interferes is cut off. However, like the antenna device 200 illustrated in FIGS. 5 and 6, the rear portion 222 b that interferes with the first metamaterial reflector 221 at the front and the second metamaterial reflector 222 at the rear is cut off. It may be formed in a different shape.

  Furthermore, as described above, both the first and second metamaterial reflectors arranged in front and back and interfering with each other may be formed in a shape in which both interfering portions are cut away (not shown). ) Of course, like the antenna devices 100 and 200 described above, only one of the first and second metamaterial reflectors 121, 122, 221, and 222 that are arranged at the front and back to interfere with each other is cut off. If the antenna device is formed into a shape, the structure and processing of the antenna devices 100 and 200 are simple and the productivity is good. However, if both of the first and second metamaterial reflectors arranged in front and rear and interfering are formed in a shape in which the interfering portion is cut off, each of the first and second metamaterial reflectors Since the deformation of the structure can be reduced, the performance and characteristics of the antenna device can be improved.

  Moreover, in the said form, it illustrated that the antenna apparatus 100 has the two metamaterial reflectors 121 and 122. FIG. However, of course, the number of such metamaterial reflectors can be arbitrarily set. Moreover, in the said form, it illustrated that the antenna device 100 had the metal reflecting plate 130. FIG. However, the antenna device may be realized only by a plurality of metamaterial reflectors without having such a metal reflector 130 (not shown).

  For example, as illustrated in FIGS. 7 and 8, the antenna device 300 may include only one metamaterial reflector 311 and one metal reflector 130. In such an antenna device 300, when the metamaterial reflector 311 and the metal reflector 130 arranged with respect to the antenna element 110 interfere with each other at the same ratio as the ratio of the two frequency bands of the radio waves to be used, the front The metamaterial reflection plate 311 may be formed in a shape in which the rear surface portion 311b is cut off, and interference with the metal reflection plate 130 may be prevented. In such an antenna device, the metamaterial reflector may not be deformed, and a recess may be formed on the front surface of a metal reflector having a sufficient thickness (not shown). The metal reflector may be deformed to form a recess in which the metamaterial reflector is accommodated (not shown).

  Furthermore, in the said form, it illustrated that the 1st and 2nd metamaterial reflectors 121 and 122 and the metal reflector 130 were each formed in the square which is a similar shape. However, such a plurality of metamaterial reflectors and metal reflectors 130 may be formed in a front shape such as a circle or a hexagon having a similar shape (not shown).

  Needless to say, the above-described embodiment and a plurality of modifications can be combined within a range in which the contents do not conflict with each other. Further, in the above-described embodiments and modifications, the structure of each part has been specifically described, but the structure and the like can be changed in various ways within a range that satisfies the present invention.

100, 200, 300 Antenna device 110 Antenna element 121, 122, 221, 222, 311 Metamaterial reflector 130 Metal reflector

Claims (4)

An antenna element for communicating electromagnetic waves in a plurality of frequency bands;
A plurality of reflectors each reflecting at least one electromagnetic wave in the frequency band;
Plate arrangement means for arranging the plurality of reflectors at the same ratio as the ratio of the plurality of frequency bands with respect to the antenna element,
The at least one reflector includes a plurality of linearly-shaped dielectrics arranged in parallel in one direction and a plurality of linear-shaped dielectrics arranged in parallel in a direction different from the one direction. Overlaid to form a lattice, it is formed into a metamaterial structure with a dielectric,
At least one reflector of the metamaterial structure is formed by partially cutting a plurality of linearly-shaped dielectrics arranged in one direction constituting the reflector in the length direction, so that the other reflectors adjacent to each other A space is formed,
The reflector of the other metamaterial structure arranged in the space formed in the reflector of the one metamaterial structure is composed of a linear dielectric having a smaller cross section than the reflector of the one metamaterial structure. ing,
Antenna device. The plurality of reflectors, the surface of which is orthogonal to the direction of the electromagnetic wave, a plurality of the frequency band ratio and the mutual size ratio is formed in the same similar shape,
The antenna device according to claim 1 . The plurality of reflectors are formed in a square having the same length as each wavelength and at least one of the electromagnetic waves reflected by each of the reflectors,
The plate arrangement means arranges a plurality of the reflection plates with respect to the antenna element at a distance of at least one wavelength of the electromagnetic wave that each reflects.
The antenna device according to claim 2 . It is the said reflector of the metamaterial structure of the antenna apparatus as described in any one of Claim 1 to 3 ,
A space is formed in which the other reflectors adjacent to each other when the antenna elements are arranged at the same ratio as the ratio of the plurality of frequency bands.
reflector.

Images