JP5465047B2 - Reflective structure - Google Patents

Description

  The present invention relates to a reflection structure, and more particularly to a reflection structure that reduces RCS (Radar Cross Section) using metamaterial technology.

  In a structure such as a fighter aircraft, it is desirable to reduce the RCS of the aircraft as much as possible in order to reduce the probability of being detected from enemy aircraft radar.

  However, in the past, although proposals for reducing mutual coupling between element antennas constituting an array antenna have been made, there are many cases where much consideration has not been given to reducing RCS (for example, Non-Patent Document 1). reference).

Akimasa Hirata, “Accuracy Compensation in Direction Finding Using Patch Antenna Array With EBG Structure,” IEEE Antennas and Wireless Propagation Letters, vol.5, pp.1-3, 2006

  Non-Patent Document 1 described above is a technique for reducing the mutual coupling between element antennas by installing an EBG (Electromagnetic Band-Gap) structure between element antennas constituting an array antenna. However, in the above-mentioned Non-Patent Document 1, since the EBG structure is treated as a reflection structure and not intended to realize a low RCS, when this is used for a structure such as a fighter aircraft, it is discovered from enemy aircraft radar. There was a problem that the probability of

  The present invention has been made to solve such a problem, and an object of the present invention is to obtain a reflection structure that can realize a low RCS.

  The present invention comprises a substantially plate-like ground conductor, and a plurality of metal platelets disposed on the ground conductor so as to be substantially parallel to the surface of the ground conductor. The reflective structure is characterized in that the dimension of the metal plate is determined using a code of a predetermined bit cut out from a pseudo-noise code sequence or a multi-value pseudo-noise code sequence.

  The present invention comprises a substantially plate-like ground conductor, and a plurality of metal platelets disposed on the ground conductor so as to be substantially parallel to the surface of the ground conductor. The size of the metal plate is determined by using a predetermined bit code cut out from the pseudo-noise code sequence or multi-value pseudo-noise code sequence. The wave front of the reflected wave does not become a flat surface, and as a result, RCS can be reduced.

It is the block diagram which showed the structure of the reflection structure which concerns on Embodiment 1 of this invention. It is explanatory drawing which showed the effect acquired from the reflective structure which concerns on Embodiment 1 of this invention with the graph. It is the block diagram which showed the structure of the reflection structure which concerns on Embodiment 2 of this invention. It is the block diagram which showed the structure of the reflective structure which concerns on Embodiment 3 of this invention. It is the block diagram which showed the structure of the reflective structure which concerns on Embodiment 4 of this invention. It is the block diagram which showed the structure of the reflective structure which concerns on Embodiment 5 of this invention. It is the block diagram which showed the structure of the reflective structure which concerns on Embodiment 6 of this invention. It is the block diagram which showed the structure of the reflective structure which concerns on Embodiment 7 of this invention.

Embodiment 1 FIG.
A reflection structure according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a configuration of a reflecting structure according to Embodiment 1 of the present invention. FIG. 1A is a cross-sectional view taken along the line AA in FIG.

  The reflection structure according to the first embodiment includes a substantially plate-like ground conductor 100 and a plurality of metal platelets 101 provided on the ground conductor 100. The plurality of metal platelets 101 are arranged on the top of the ground conductor 100 in a direction substantially parallel to the surface of the ground conductor 100 so as to be periodic at regular intervals in at least one direction. In this embodiment, the metal plate 101 has a substantially square shape.

  More specifically, as shown in FIG. 1B, the surface of the ground conductor 100 is partitioned in a matrix, and a plurality of substantially square cells are arranged vertically and horizontally. The metal plate 101 is arranged in a one-to-one relationship with each cell so as to fit in the center of each cell and within each cell corresponding to the position of each cell.

  Now, an arbitrary pseudo-noise code sequence 102 such as an M-sequence code is prepared, and a plurality of bit strings having a predetermined number of bits (K bits) are cut out from the pseudo-noise code sequence 102 to generate a plurality of codes 103. In the present embodiment, as shown in FIG. 1, the code 103 is composed of a 4-bit (K = 4) bit string. The pseudo-noise code sequence 102 is a binary number sequence consisting of 0 and 1. Note that the method of generating the code 103 is not limited to cutting from the pseudo-noise code sequence 102, but may be cut from a multi-value pseudo-noise code sequence such as a multi-value M-sequence code.

  In the present embodiment, the dimension of the metal plate 101 is determined using the code 103 generated in this way. For example, two real numbers satisfying Lmin <Lmax are set to Lmin and Lmax, respectively, the decimal notation of the code 103 cut out from the pseudo-noise code sequence 102 is set to dn, and the maximum value that dn can take is set to M. Time,

  (Dimension of metal plate) = (Lmax−Lmin) × dn / M + Lmin (1)

As a result, the dimension of the metal plate 101 is given by the equation (1). Note that the dimension of the metal plate 101 in this embodiment is the length of one side of the square constituting the metal plate 101.

  That is, in the example of FIG. 1, the reference numeral 103 is 0011, 0100, 0111,... These decimal numbers dn are 3, 4, 7,. At this time, since M is the maximum value that dn can take, that is, the decimal notation of 1111 that is the maximum value of the code 103, M is 15. Therefore, the length of one side of the square constituting the metal plate 101 is given below.

Leftmost: (Lmax−Lmin) × 3/15 + Lmin
= (Lmax−Lmin) × 1/5 + Lmin

2nd from left: (Lmax−Lmin) × 4/15 + Lmin

3rd from left: (Lmax−Lmin) × 7/15 + Lmin

  At this time, the values of Lmax and Lmin are appropriately determined from the specification data of the reflecting structure.

  In the present embodiment, by determining the dimensions of the metal platelets 101 in this way, the reflection phases of the metal platelets 101 are different, and when a plane wave is incident on the reflection structure, the wavefront of the reflected wave is flat. Not. Thereby, it becomes possible to prevent RCS from increasing in the reflection direction of the plane wave.

  In the present embodiment, the metal plate 101 is described as being square, but the present invention is not limited to this, and the same may be applied to any shape.

  In the present embodiment, an example in which the dimension of one side of the square constituting the metal plate 101 is determined by the code 103 cut out from the pseudo-noise code sequence 102 is not limited to this case, but the code 103 Thus, the area of the metal plate 101 or the value of the square root of the area may be determined.

  Furthermore, although the above formula (1) is used in the present embodiment, any formula can be used as long as it can be expressed using the reference numeral 103.

  The reflection structure according to the present embodiment includes a ground conductor 100 and a plurality of metal platelets 101, and the plurality of metal platelets 101 is periodically arranged in at least one direction above the ground conductor 100. Two real numbers satisfying Lmin <Lmax are set to Lmin and Lmax, and the pseudo-noise code sequence 102 is applied to the nth metal plate 101 among the plurality of metal plates 101. (Lmax−Lmin) × dn / M + Lmin using the decimal notation dn of the K-bit code 103 cut out from (or the code cut out from the multilevel pseudo-noise code sequence) and the maximum value M that dn can take. Is set to be the area of the nth metal plate 101 or the square root of the area or the length of one side. Therefore, when a plane electromagnetic wave is incident on the reflection structure, the wavefront of the reflected wave is the plane. Razz, it is possible to reduce the RCS.

  The effect of the reflecting structure created by the procedure shown in this embodiment will be described with reference to FIG. FIG. 2 shows the angle characteristics of the reflection intensity when radio waves are incident vertically from the normal direction of the reflection structure. The horizontal axis is the angle, which is the angle away from the incident direction. The vertical axis represents the reflection intensity. In addition, as a comparison object of the characteristics of the reflecting structure of the present embodiment, the reflecting characteristics of a metal plate having the same area as the reflecting structure are also shown in the drawing. In the case of a metal plate, a strong reflection intensity occurs in the incident direction, but the reflection structure of the present embodiment exhibits a substantially flat characteristic regardless of the angle. Thus, the reflection structure of the present embodiment does not produce strong reflection intensity in a specific direction, and as a result, RCS can be reduced.

  As described above, in the present embodiment, the ground conductor 100 and the plurality of metal platelets 101 are provided, and the plurality of metal platelets 101 are periodically disposed in the upper portion of the ground conductor 100 in at least one direction. In the reflection structure arranged in a direction parallel to the metal plate 101, the size of each metal plate 101 (the length or area of one side of each metal plate 101 or the square root of the area) is set as the pseudo noise code sequence 102 (or multi-value pseudo). Since it is determined using the K-bit code 103 cut out from the noise code sequence), when a plane electromagnetic wave is incident on the reflection structure, the wavefront of the reflected wave is not a plane, and RCS can be reduced. The effect of becoming is obtained. Further, when the reflection structure according to the present embodiment is used for a structure such as a fighter aircraft, the probability of being detected from enemy aircraft radar can be reduced, which is effective.

Embodiment 2. FIG.
A reflection structure according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing a configuration of a reflecting structure according to Embodiment 2 of the present invention. FIG. 3A is a cross-sectional view taken along the line AA in FIG.

  The reflection structure according to the second embodiment includes a substantially plate-like ground conductor 200 and a plurality of metal platelets 201 provided on the top of the ground conductor 200. The plurality of metal platelets 201 are arranged on the top of the ground conductor 200 in a direction substantially parallel to the surface of the ground conductor 200 so as to be periodic at regular intervals in at least one direction. In this embodiment, the metal plate 201 has a substantially square shape.

  More specifically, also in the present embodiment, as in the first embodiment, as shown in FIG. 3B, the surface of the ground conductor 200 is partitioned in a matrix shape, and a plurality of approximately vertical and horizontal shapes. Square cells are arranged. The metal plate 201 is arranged in a one-to-one relationship with each cell so as to fit in the center of each cell and within each cell corresponding to the position of each cell.

  Now, an arbitrary pseudo-noise code sequence 202 such as an M-sequence code is prepared, and a plurality of bit strings having a predetermined number of bits (K bits) are cut out from the pseudo-noise code sequence 202 to generate a plurality of codes 203. In the present embodiment, as shown in FIG. 1, the code 203 is composed of a 4-bit (K = 4) bit string. The pseudo noise code sequence 202 is a binary number sequence consisting of 0 and 1. Note that the method of generating the code 203 is not limited to cutting from the pseudo-noise code sequence 102 but may be cut from a multi-value pseudo-noise code sequence such as a multi-value M-sequence code.

  In the present embodiment shown in FIG. 2, the distance between adjacent metal platelets 201 is determined using the code 203 generated in this way. For example, when two real numbers satisfying Lmin <Lmax are respectively Lmin and Lmax, the decimal notation of the code 203 extracted from the pseudo-noise code sequence 202 is dn, and the maximum value that dn can take is M.

  (Distance between metal plates) = (Lmax−Lmin) × dn / M + Lmin (2)

As a result, the distance between adjacent metal platelets 101 is given by the equation (2).

  That is, in the example of FIG. 3, the code 203 is 0011, 0100, 0111,... These decimal numbers dn are 3, 4, 7,. At this time, since M is the maximum value that dn can take, that is, the decimal notation of 1111 that is the maximum value of the code 203, M is 15. Therefore, the length of one side of the square constituting the metal plate 201 is given as follows.

The distance between the leftmost metal platelet and the second metal platelet from the left adjacent to it:
(Lmax−Lmin) × 3/15 + Lmin
= (Lmax−Lmin) × 1/5 + Lmin

Distance between the second metal plate from the left and the third metal plate from the left adjacent to it:
(Lmax−Lmin) × 4/15 + Lmin

Distance between the third metal platelet from the left and the fourth metal platelet from the left adjacent to it:
(Lmax−Lmin) × 7/15 + Lmin

  Also in the present embodiment, as in the first embodiment, the values of Lmax and Lmin are appropriately determined from the specification data of the reflecting structure.

  By doing so, the reflection phase in each metal plate 101 is different, and when a plane wave is incident on this reflection structure, the wave front of the reflected wave is not flat. In this embodiment as well, the metal plate 201 is a square as in the first embodiment, but the same applies to any shape. Furthermore, although the formula (2) is used in the present embodiment, the same applies even when an arbitrary formula that can be expressed by reference numeral 203 is used.

  As described above, in the present embodiment, the ground conductor 200 and the plurality of metal platelets 201 are provided, and the plurality of metal platelets 201 are periodically disposed in the upper portion of the ground conductor 200 in at least one direction. Is determined using a K-bit code 203 cut out from the pseudo-noise code sequence 102 (or multi-value pseudo-noise code sequence). Since it did in this way, when a plane electromagnetic wave enters into a reflective structure, the wave front of a reflected wave does not become a plane, but the effect that it becomes possible to reduce RCS is acquired. Further, when the reflection structure according to the present embodiment is used for a structure such as a fighter aircraft, the probability of being detected from enemy aircraft radar can be reduced, which is effective.

Embodiment 3 FIG.
A reflection structure according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 4 is a diagram showing a configuration of a reflecting structure according to Embodiment 3 of the present invention. 4A is a cross-sectional view taken along the line AA in FIG.

  The reflecting structure according to the third embodiment includes a substantially plate-like ground conductor 300 and a plurality of metal platelets 301 provided on the ground conductor 300. The plurality of metal platelets 301 are arranged on the top of the ground conductor 300 in a direction substantially parallel to the surface of the ground conductor 300 so as to be periodic at regular intervals in at least one direction. In this embodiment, the metal plate 301 has a square shape.

  More specifically, also in the present embodiment, as in the first embodiment, as shown in FIG. 4B, the surface of the ground conductor 300 is divided into a matrix, and a plurality of approximately vertical and horizontal shapes. Square cells are arranged. The metal plate 301 is arranged in a one-to-one relationship with each cell so as to fit in the center of each cell and within each cell corresponding to the position of each cell.

  Now, an arbitrary pseudo-noise code sequence 302 such as an M-sequence code is prepared, and a plurality of bit strings having a predetermined number of bits (K bits) are cut out from the pseudo-noise code sequence 302 to generate a plurality of codes 303. In the present embodiment, as shown in FIG. 4, the code 303 is composed of a 4-bit (K = 4) bit string. The pseudo noise code sequence 302 is a binary number sequence consisting of 0 and 1. Note that the method of generating the code 303 is not limited to cutting from the pseudo-noise code sequence 302, but may be cut from a multi-value pseudo-noise code sequence such as a multi-value M-sequence code.

  The structure up to this point is the same as that of the first embodiment described above, except that in this embodiment, a selected small cell 304 among the cells of the ground conductor 300 is provided with a metal plate 301. Do not install. This means that the metal plate 301 is thinned out over the entire surface of the ground conductor 300. In addition, what is necessary is just to determine suitably how to select the cell 304 which does not install the metal small plate 301 from several cells by the following methods.

(1): A cell 304 is selected at random using a random number or the like.
(2): The cells 304 are selected periodically in the direction in which the cells are arranged (that is, one cell is thinned out every N cells in each row (or each column), where N is a fixed value. ).
(3): The cells 304 are selected periodically in the direction in which the cells are arranged (that is, one cell is thinned out every N cells in each row (or each column), where N is a cyclic sequence. (For example, a sequence such as 3, 2, 1, 3, 2, 1,...)).
(4): The cells 304 are generally arranged at the same frequency like a checkerboard pattern (the cells 304 are not biased in one place).

  In the present embodiment shown in FIG. 3, the size of the metal plate 301 is determined using the reference numeral 303. For example, when two real numbers satisfying Lmin <Lmax are set to Lmin and Lmax, a code cut out from the pseudo-noise code sequence 302 is set to dn, and a maximum value that dn can take is set to M,

  (Dimension of metal plate) = (Lmax−Lmin) × dn / M + Lmin (3)

Give the dimensions as Note that the dimension of the metal plate 301 in this embodiment is the length of one side of the square constituting the metal plate 301.

  At this time, the values of Lmax and Lmin are appropriately determined from the specification data of the reflecting structure as in the first and second embodiments. Note that details of the determination of dimensions are the same as those in the first embodiment, and thus description thereof is omitted here.

  In the present embodiment, by doing so, the reflection phase in each metal plate 301 is different, and when a plane wave is incident on this reflection structure, the wave front of the reflected wave is not flat. As a result, it is possible to prevent RCS from increasing in the reflection direction of the plane wave.

  In the present embodiment, the metal plate 301 is square, but the same may be applied to any shape. In this embodiment, the size of the square piece is determined by the code 303 cut out from the pseudo-noise code sequence, but the area of the metal plate 301 or the square root value of the area may be determined. Furthermore, although the formula (3) is used in the present embodiment, the same applies even when an arbitrary formula that can be expressed using the reference numeral 303 is used. In this embodiment, an example in which the feature of thinning the metal plate 301 is applied to the configuration of the first embodiment has been described. However, the present invention is not limited to this case, and is applied to the configuration of the second embodiment. Also good.

  As described above, in the present embodiment, the ground conductor 300 and the plurality of metal platelets 301 are provided, and the plurality of metal platelets 301 are periodically provided in the upper portion of the ground conductor 300 in at least one direction. In the reflection structure arranged in a direction parallel to the metal plate 301, the size of each metal plate 301 (the length or area of one side of each metal plate 101 or the square root of the area) is set as the pseudo noise code sequence 302 (or multi-value pseudo). Since the determination is made using the K-bit code 303 cut out from the noise code sequence), when a plane electromagnetic wave is incident on the reflection structure, the wavefront of the reflected wave is not a plane, and RCS can be reduced. The effect of becoming is obtained. Further, when the reflection structure according to the present embodiment is used for a structure such as a fighter aircraft, the probability of being detected from enemy aircraft radar can be reduced, which is effective. Furthermore, in the present embodiment, the metal platelets 301 are thinned out and arranged in the periodically arranged direction, so that the number of metal platelets 301 can be reduced and the manufacturing cost can be reduced. be able to.

Embodiment 4 FIG.
A reflection structure according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 5 is a diagram showing a configuration of a reflecting structure according to Embodiment 4 of the present invention. FIG. 5 is a cross-sectional view of one cell described in the first to third embodiments. As shown in FIGS. 1 to 4, the reflecting structure according to the present embodiment is actually a plurality of arranged vertically and horizontally formed by dividing the surface of a substantially plate-like ground conductor into a matrix. Cell. The same applies to the following fifth to seventh embodiments. 5 to 8, only the configuration for one cell is shown, but the other cells are assumed to have the same configuration according to the cell.

  The reflection structure according to the fourth embodiment includes a substantially plate-like ground conductor 400 and a metal plate 401 and media 402, 403, and 404 provided on the ground conductor 400. The media 402 and 403 are laminated between the ground conductor 400 and the metal plate 401. The medium 402 is provided on the ground conductor 400, and the medium 403 is provided on the medium 402. Further, the medium 404 is further laminated on the upper part of the metal plate 401 and the upper part of the medium 403. Therefore, the metal plate 401 is disposed between the layer of the medium 403 and the layer of the medium 404 as shown in FIG. The metal plate 401 and the media 402, 403, and 404 are disposed on the ground conductor 400 in a direction substantially parallel to the surface of the ground conductor 400. The media 402, 403, and 404 are dielectric layers or magnetic layers made of a dielectric or magnetic material.

  As described above, in the present embodiment, in the cell configuration shown in the first, second, and third embodiments, a dielectric or magnetic material is further provided between the ground conductor and the metal plate and on the metal plate. Since the mediums 402, 403, and 404 composed of the body are provided, the effect that the reflection phase in the cell structure is controlled can be obtained.

  The cell structure in the fourth embodiment is used as the basic structure of the cell in the first, second, and third embodiments. By arranging this basic structure, the reflection structure in the first, second, and third embodiments can be made. . It goes without saying that the effects obtained in the first, second, and third embodiments are thereby obtained.

Embodiment 5 FIG.
A reflection structure according to Embodiment 5 of the present invention will be described with reference to FIG. FIG. 6 is a diagram showing a configuration of a reflecting structure according to Embodiment 5 of the present invention. FIG. 6 is a cross-sectional view of one cell described in the first to third embodiments.

  The reflection structure according to the fifth embodiment includes a substantially plate-like ground conductor 500, a metal plate 501 provided on the ground conductor 500, and media 502, 503, and 504. The media 502 and 503 are stacked between the ground conductor 500 and the metal plate 501. The medium 502 is provided above the ground conductor 500, and the medium 503 is provided above the medium 502. Further, the medium 504 is further laminated on the upper part of the metal plate 501 and the upper part of the medium 503. Therefore, the metal plate 501 is arranged between the layer of the medium 503 and the layer of the medium 504 as shown in FIG. In addition, the metal plate 501 and the media 502, 503, and 504 are disposed on the top of the ground conductor 500 in a direction substantially parallel to the surface of the ground conductor 500.

  The thicknesses t1, t2, and t3 of the media 502, 503, and 504 are predetermined noise noise code sequences (see, for example, 102 in FIG. 1, 202 in FIG. 3, 202 in FIG. 4) or multilevel pseudo noise code sequences. The bit code (for example, see 103 in FIG. 1, 203 in FIG. 3, 303 in FIG. 4) is used for determination. In the example of FIG. 6, an example in which the thicknesses t1, t2, and t3 are determined based on a code 505 including a 4-bit bit string cut out from the pseudo-noise code sequence is shown. Note that the extraction method indicated by reference numeral 505 may be the same as the extraction methods indicated by reference numerals 103, 203, and 303 described in Embodiments 1 to 3, and therefore, description thereof will be omitted here. In addition, the method for determining the values of the thicknesses t1, t2, and t3 using the reference numeral 505 is the method for determining the dimensions of the metal plates 101 and 301 of the first and third embodiments, or the adjacent metal of the second embodiment. Since it may be the same as the method for determining the distance between the small plates 201, these are referred to here, and the description thereof is omitted.

  As described above, the structure according to the fifth embodiment is basically the same as that of the fourth embodiment. However, in the fifth embodiment, the thickness of the mediums 502, 503, and 504 is further changed to a pseudo value. Since it is determined by the bit string of the noise sequence, the reflection phase in the cell structure is controlled more accurately than in the fourth embodiment.

  The cell structure in the fifth embodiment is used as the basic structure of the cell in the first, second and third embodiments. By arranging this basic structure, the reflection structure in the first, second and third embodiments can be made. . It goes without saying that the effects obtained in the first, second, and third embodiments are thereby obtained.

Embodiment 6 FIG.
A reflection structure according to Embodiment 6 of the present invention will be described with reference to FIG. FIG. 7 is a diagram showing a configuration of a reflecting structure according to Embodiment 6 of the present invention. FIG. 7 is a cross-sectional view of one cell described in the first to third embodiments.

  The reflection structure according to the sixth embodiment includes a substantially plate-like ground conductor 600 and a metal plate 601 and media 602, 603, and 604 provided on the ground conductor 600. The media 602 and 603 are stacked between the ground conductor 600 and the metal plate 601. The medium 602 is provided above the ground conductor 600, and the medium 603 is provided above the medium 602. The medium 604 is further laminated on the upper part of the metal plate 601 and the upper part of the medium 603. Therefore, the metal plate 601 is disposed between the layer of the medium 603 and the layer of the medium 604 as shown in FIG. The metal plate 601 and the media 602, 603, 604 are disposed on the ground conductor 600 in a direction substantially parallel to the surface of the ground conductor 600.

  The material constants ε1, ε2, and ε3 of the dielectric layers or magnetic layers constituting the media 602, 603, and 604 are converted into pseudo-noise code sequences (see, for example, 102 in FIG. 1, 202 in FIG. 3, and 302 in FIG. 4). ) Or a predetermined bit code cut out from the multi-value pseudo-noise code sequence (for example, see 103 in FIG. 1, 203 in FIG. 3, 303 in FIG. 4). Examples of the material constants ε1, ε2, and ε3 include, for example, a relative permittivity, a relative permeability, a dielectric loss tangent, and the like. Therefore, at least one of these is a pseudo noise code sequence or a multi-value pseudo noise code sequence It is determined using the code of a predetermined bit cut out from the above.

  In the example of FIG. 7, an example is shown in which the material constants ε1, ε2, and ε3 are determined based on a code 605 composed of a 4-bit bit string cut out from the pseudo-noise code sequence. Note that the extraction method indicated by reference numeral 605 may be the same as the extraction methods indicated by reference numerals 103, 203, and 303 described in Embodiments 1 to 3, and therefore, description thereof will be omitted here. The method for determining the values of the material constants ε1, ε2, and ε3 using the reference numeral 605 is the method for determining the dimensions of the metal plates 101 and 301 of the first and third embodiments, or the adjacent metal of the second embodiment. Since it may be performed in the same manner as the method for determining the distance between the small plates 201, these are referred to here, and the description thereof is omitted.

  As described above, the structure according to the sixth embodiment is basically the same as that of the fourth embodiment. However, in the sixth embodiment, the material constants of the media 602, 603, and 604 are further set to pseudo noise. Since the determination is made based on the bit string of the series, the reflection phase in the cell structure is controlled more accurately than in the fourth embodiment.

  The cell structure in the sixth embodiment is used as the basic structure of the cell in the first, second and third embodiments. By arranging this basic structure, the reflection structure in the first, second and third embodiments can be made. . It goes without saying that the effects obtained in the first, second, and third embodiments are thereby obtained.

Embodiment 7 FIG.
A reflection structure according to Embodiment 7 of the present invention will be described with reference to FIG. FIG. 8 is a diagram showing a configuration of a reflecting structure according to Embodiment 7 of the present invention. FIG. 8 is a cross-sectional view of one cell described in the first to third embodiments.

  The reflecting structure according to the seventh embodiment includes a substantially plate-shaped ground conductor 700, a metal plate 701 provided on the ground conductor 700, and media 702, 703, and 704. The media 702 and 703 are stacked between the ground conductor 700 and the metal plate 701. The medium 702 is provided above the ground conductor 700, and the medium 703 is provided above the medium 702. Further, the medium 704 is further laminated on the upper part of the metal plate 701 and the upper part of the medium 703. Therefore, the metal plate 701 is disposed between the layer of the medium 703 and the layer of the medium 704 as shown in FIG. The metal plate 701 and the media 702, 703, and 704 are disposed above the ground conductor 700 in a direction substantially parallel to the surface of the ground conductor 700.

  In the seventh embodiment, the wire-like metal body 705 made of a highly conductive metal such as copper or gold is provided in the thickness direction of the media 702 and 703 from the ground conductor 700 to the metal body 701. (Ie, in the vertical direction) extending through them, and the ground conductor 700 and the metal plate 701 are electrically connected through the metal body 705.

  As described above, the structure according to the seventh embodiment is basically the same as that of the seventh embodiment. However, in the seventh embodiment, the ground conductor 700 and the metal body 701 are further combined with a metal body. Since the electrical connection is made by 705, the reflection phase in the cell structure is controlled more accurately than in the fourth embodiment.

  Arranging the basic structure as the basic structure of the cell in the first, second, and third embodiments using the cell structure in the seventh embodiment or any combination of the fourth, fifth, sixth, and seventh embodiments. Thus, the reflection structure in the first, second, and third embodiments can be made. Moreover, it cannot be overemphasized that the effect acquired by Embodiment 1-7 is acquired by it.

  In the above-described Embodiments 4 to 7, two layers (dielectric layer or magnetic layer) are provided between the ground conductor and the metal plate, and one layer (dielectric layer) is provided on the metal body. However, the present invention is not limited to such a case, and one or more layers (dielectric layer or magnetic layer) may be provided between the ground conductor and the metal plate. Or, there is an option that it is not provided between the ground conductor and the metal plate. Similarly, two or more layers (dielectric layers or magnetic layers) may be provided on the metal plate. Or, there is an option that it is not provided on the metal plate, so where and how many layers are provided may be appropriately determined according to the purpose of use, usage environment, manufacturing cost, etc. I will do it.

  100, 200, 300, 400, 500, 600, 700 Ground conductor, 101, 201, 301, 401, 501, 601, 701 Metal plate, 102, 202, 302 Pseudo-noise code sequence, 103, 203, 303, 505 , 605 code, 304 cells, 402403, 404, 502, 503, 504, 602, 603, 604, 702, 703, 704 medium, 705 metal body.

Claims (8)

A substantially plate-like ground conductor;
A plurality of metal platelets disposed on the ground conductor so as to be substantially parallel to the surface of the ground conductor;
A reflection structure characterized in that a dimension of each of the metal platelets is determined using a code of a predetermined bit cut out from a pseudo-noise code sequence or a multi-value pseudo-noise code sequence. The dimension of the metal platelet is any one of the length of one side of the metal platelet, the area of the metal platelet, and the square root of the area of the metal platelet. Item 2. The reflecting structure according to Item 1. A substantially plate-like ground conductor;
A plurality of metal platelets disposed on the ground conductor so as to be substantially parallel to the surface of the ground conductor;
A reflection structure, wherein a distance between adjacent metal platelets is determined using a code of a predetermined bit cut out from a pseudo-noise code sequence or a multi-value pseudo-noise code sequence. The surface of the ground conductor is divided into a plurality of cells in a matrix,
The metal platelets are arranged corresponding to the cells one by one,
2. The metal plate is thinned out and arranged over the entire surface of the ground conductor by not arranging the metal plate in a selected part of the cells. 4. The reflection structure according to any one of items 3 to 3. One or a plurality of dielectric layers or magnetic layers are laminated between the ground conductor and the metal plate and on the metal plate. The reflective structure described. 6. The reflection structure according to claim 5, wherein the thickness of the dielectric layer or the magnetic layer is determined using a code of a predetermined bit cut out from the pseudo-noise code sequence or the multi-value pseudo-noise code sequence. . A predetermined bit obtained by cutting at least one of material constants such as a relative permittivity, a relative permeability, and a dielectric loss tangent of the dielectric layer and the magnetic layer from a pseudo-noise code sequence or a multi-value pseudo-noise code sequence The reflective structure according to claim 5 , wherein the reflective structure is determined by using the symbol. The reflection structure according to any one of claims 1 to 7, wherein the ground conductor and the metal plate are electrically connected.

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