JP2006148529A - Corner reflector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small corner reflector having re-radiation performance equivalent to a conventional one. <P>SOLUTION: The corner reflector 1 is composed of a first face 11-a third face 13 formed of a pentagon in the same shape. The first face 11-the third face 13 have a shape by which three virtual right-angled isosceles triangles in the same shape can be obtained by extending prescribed three sides forming the pentagon. The first face 11-the third face 13 are arranged so that the three virtual right-angled isosceles triangles form a virtual triangular pyramid having an equilateral triangular opening. The end including two angles at an equal angle is removed in each of the three virtual right-angled isosceles triangles so that an actual opening formed by the first face 11-the third face 13 becomes a regular hexagon in the plane formed by the opening of the virtual triangular pyramid. By this, the pentagon as the first face 11-the third face 13 is specified. The face as the inner face of the virtual triangular pyramid in each of the first face 11-the third face 13 reflects an electromagnetic wave. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a corner reflector, and more particularly to a corner reflector used as an electromagnetic wave reflector of a radar or a communication device.

  There are various types of corner reflectors as electromagnetic wave reflectors used in radar and communication equipment. As an example thereof, there is a corner reflector having a triangular pyramid shape (hereinafter referred to as a triangular pyramid corner reflector). The triangular pyramid-shaped corner reflector has a configuration in which three right-angled isosceles triangles having an equilateral triangular opening surface and serving as an electromagnetic wave reflector that reflects electromagnetic waves are bonded together. In the triangular pyramid-shaped corner reflector, due to the characteristics determined based on its shape, electromagnetic waves incident on the inside from the opening surface are reflected on the three surfaces constituting the corner reflector, respectively (thus reflecting three times). Again, the electromagnetic wave is re-radiated in the incident direction.

In addition, a technique has been proposed in which a corner portion including an excitation element of a corner reflector antenna is folded back toward the antenna opening surface to obtain a folded corner reflector antenna having a small size and excellent directivity.
JP-A-10-209748

  A conventional triangular pyramid corner reflector has a relatively large external dimension and a relatively large area (hereinafter referred to as an installation space) required for the installation. For this reason, it was not possible to install (mount or embed) in a place where there is no room for installation space. For example, there is no installation space in automobiles, motorcycles, bicycles, building walls, utility poles, bridge railings, rockets (including missiles, etc.), tampering prevention poles (eg, sensors for level crossings), etc. It was difficult to install a triangular pyramid-shaped corner reflector because it was an object of mischief to stand out and the appearance was damaged.

  However, depending on the part of the surface of the triangular pyramid corner reflector, there is a part where the electromagnetic wave incident on the inside cannot be re-radiated (does not contribute to reflection in the incident direction). According to the study of the present inventor, such a portion is a useless portion in terms of the function of the corner reflector, but contributes to increasing the outer dimension. Further, according to the study of the present inventor, if such a portion where the electromagnetic wave incident on the inside cannot be re-radiated can be removed from the surface of the triangular pyramidal corner reflector without degrading the performance, the conventional triangular shape can be obtained. A smaller corner reflector can be obtained while having a re-radiation performance equivalent to that of the cone-shaped corner reflector.

  An object of the present invention is to provide a small corner reflector having a re-radiation performance equivalent to the conventional one.

  The corner reflector of the present invention is a corner reflector that re-radiates an incident electromagnetic wave in a direction parallel to the incident direction, and includes a first surface, a second surface, and a third surface that are pentagons having the same shape. The first surface, the second surface, and the third surface have a shape in which three virtual isosceles triangles having the same shape can be obtained by extending predetermined three sides forming the pentagon, The first surface, the second surface, and the third surface are arranged so that the virtual three isosceles right triangles form a virtual triangular pyramid having an equilateral triangular opening, and the virtual triangle In each of the three virtual right-angled isosceles triangles such that the actual openings formed by the first surface, the second surface, and the third surface are regular hexagons in the plane formed by the openings of the cone. By removing the end containing two corners of equal angle, One surface defining the pentagon is the second and third surfaces, the first surface, second and third surfaces surfaces forming the virtual triangular pyramid inner surface at each reflects electromagnetic waves.

  The corner reflector of the present invention is a corner reflector that re-radiates incident electromagnetic waves in a direction parallel to the incident direction, and includes a first surface, a second surface, and a third surface that have the same shape. The first surface, the second surface, and the third surface have shapes in which three virtual right-angled isosceles triangles having the same shape are obtained by extending the plane, and the three virtual surfaces The first surface, the second surface, and the third surface are arranged such that a right isosceles triangle forms a virtual triangular pyramid having an equilateral triangular opening, and in the virtual triangular pyramid, In each of the three right-angled isosceles triangles, the portions that do not contribute to the re-radiation of the electromagnetic wave are removed, thereby defining the shapes of the first surface, the second surface, and the third surface. Each of the surface and the third surface becomes the inner surface of the virtual triangular pyramid But to reflect the electromagnetic waves.

  The corner reflector of the present invention is a corner reflector that re-radiates incident electromagnetic waves in a direction parallel to the incident direction, and includes a first surface, a second surface, and a third surface that have the same shape. The first surface, the second surface, and the third surface have shapes in which three virtual right-angled isosceles triangles having the same shape are obtained by extending the plane, and the three virtual surfaces The first surface, the second surface, and the third surface are arranged so that the right isosceles triangle forms a virtual triangular pyramid having an equilateral triangular opening, and the first surface, the second surface, and the third surface are arranged. In each of the surfaces, the surface which is the inner surface of the virtual triangular pyramid reflects electromagnetic waves, and the RCS in the reflection is substantially equivalent to a triangular pyramid corner reflector having the same shape as the virtual triangular pyramid. .

  In the corner reflector of the present invention, the first surface, so that the actual opening is a regular hexagon in the plane formed by the virtual triangular pyramid opening formed by the first surface, the second surface, and the third surface, In each of the three virtual right-angled isosceles triangles formed by the second surface and the third surface, an end portion including two equal angles is removed (see FIG. 3). In the corner reflector of the present invention, a portion of the virtual triangular pyramid that does not contribute to re-radiation of electromagnetic waves in each of the three virtual right-angled isosceles triangles is removed. Moreover, in the corner reflector of this invention, RCS in the said reflection is substantially equivalent to the triangular pyramid type corner reflector which has the same shape as the said virtual triangular pyramid.

  As described above, according to the corner reflector of the present invention, it is possible to remove a portion where the electromagnetic wave incident on the inside cannot be re-radiated in the incident direction (a direction parallel to the incident direction) according to the study of the present inventor. Such a part is a useless part in terms of the function of the corner reflector, and there is no problem even if it is removed from the viewpoint of re-radiation performance. Thereby, compared with the conventional triangular pyramid-shaped corner reflector which has equivalent reflective performance, the external shape of a corner reflector can be reduced in size, without reducing re-radiation performance. As a result, according to the corner reflector of the present invention, the installation space can be reduced. For this reason, the corner reflector according to the present invention can be installed (mounted or embedded) even in a place where there is conventionally no room for installation space. For example, the corner reflector according to the present invention can be used for automobiles, motorcycles, bicycles, building walls, utility poles, bridge railings, rockets (including missiles), camouflaged poles for preventing tampering (for example, sensors for level crossings), etc. Can also be installed. Moreover, even if it installs in such various installation space, since it is small and inconspicuous, it can prevent becoming a target of mischief and can prevent impairing an external appearance.

  FIG. 1 is a configuration diagram of a corner reflector and shows an example of a configuration of a corner reflector of the present invention. 1A is a top view, FIG. 1B is a front view, FIG. 1C is a side view, and FIG. 1D is a rear view. 2 and 3 are explanatory diagrams of the corner reflector, and are diagrams for explaining the configuration of the corner reflector of the present invention.

  The corner reflector 1 of the present invention is a corner reflector (radar target) that re-radiates (reflects) an incident electromagnetic wave in a direction parallel to the incident direction (including the incident direction). In FIGS. 1A and 1C, the incident direction of the re-radiated electromagnetic wave is indicated by an arrow. The corner reflector 1 includes a first surface (left surface) 11, a second surface (right surface) 12, and a third surface (bottom surface) 13, which are pentagons having the same shape. As shown in FIG. 2 (A), the first surface 11, the second surface 12, and the third surface 13 are made of the pentagonal planar (plate-shaped) member. Construct a reflective surface. There is no distinction between the first surface 11 to the third surface 13, and any surface may be the first surface 11 to the third surface 13.

  As shown in FIG. 2B, the first surface 11, the second surface 12, and the third surface 13 are formed by extending three predetermined sides that form the pentagon, so that there are three virtual shapes having the same shape. Right isosceles triangles 101 to 103 (see FIG. 2C). The predetermined three sides to be extended are sides that form two equal angles in each of the three virtual right-angled isosceles triangles 101 to 103. Or the 1st surface 11, the 2nd surface 12, and the 3rd surface 13 have the shape from which the virtual three right-angled isosceles triangles 101-103 of the same shape are obtained by expanding the said plane. The first surface 11, the second surface 12, and the third surface 13 are virtual triangular pyramids (see FIG. 3) in which the virtual three right-angled isosceles triangles 101 to 103 have an equilateral triangular opening 104. Thus, the corner reflector 1 of the present invention shown in FIG. 1 is configured.

  Based on this virtual triangular pyramid, as shown in FIG. 3, a triangular pyramid corner reflector 100 having the same shape as this can be assumed. The triangular pyramid corner reflector 100 having the same shape as the virtual triangular pyramid in the corner reflector 1 of the present invention is referred to as a virtual triangular pyramid corner reflector 100 in this specification. That is, FIG. 3 shows a virtual triangular pyramidal corner reflector 100 corresponding to the corner reflector 1 of FIG.

  3A, FIG. 3B, FIG. 3C, and FIG. 3D are respectively shown in FIG. 1A, FIG. 1B, FIG. 1C, and FIG. And shows a top view, a front view, a side view, and a rear view of the virtual triangular pyramid corner reflector 100. This virtual triangular pyramid corner reflector 100 is a triangular pyramid corner reflector having a known shape. Therefore, it can be said that the corner reflector 1 of the present invention is a modification of the triangular pyramid corner reflector (100). In FIG. 3, the shape of the corner reflector 1 of FIG.

  The corner reflector 1 of the present invention has a shape when an incident frequency and an RCS (Radar Cross Section) at the frequency (hereinafter, both are referred to as re-radiation characteristics) are determined, similarly to the triangular pyramid corner reflector (100). (Appearance) is also uniquely determined. The corner reflector 1 of the present invention shown in FIG. 1 is a corner reflector 1 that realizes RCS = about 15 dBsm when an electromagnetic wave of 76.5 GHz, for example, is incident. As will be described later, the corner reflector 1 of the present invention has the same reflection performance as that of the virtual triangular pyramid-shaped corner reflector 100, and therefore corresponds to the corner reflector 1 of the present invention shown in FIG. 1 (that is, in FIG. 3). Similarly, the virtual triangular pyramid corner reflector 100 is also a triangular pyramid corner reflector (100) that realizes RCS = about 15 dBsm when an electromagnetic wave of, for example, 76.5 GHz is incident.

Further, in the virtual three-pyramidal corner reflector 100 in FIG. 3, first _{^{formula: A T = a 2/3}} 1/2, and the second equation: σ = (4πa ⁴⁾ / If (3 [lambda] ²⁾ is satisfied In the corner reflector 1 of FIG. 1, the first and second formulas are also established. Here, _AT is an Equivalent Flat-Plate Area of Target, σ is a Scattering Cross Section of Target, and a is a ridgeline 106 of the opening 104 of the virtual triangular pyramidal corner reflector 100 of FIG. This is the length of the side of the virtual two right isosceles triangles. That is, the length of the corresponding ridgeline 16 (see FIG. 1C) of the corner reflector 1 of FIG. 1 is shorter than the ridgeline 106, but regardless of this, the ridgeline 106 has a value a for the corner reflector 1 of FIG. The first expression and the second expression are substituted. This is because the corner reflector 1 of FIG. 1 has the same characteristics as the virtual triangular pyramid-shaped corner reflector 100 of FIG.

  As described above, according to the present invention, although the corner reflector 1 is downsized, the corner reflector 1 has the same characteristics as the virtual triangular pyramid corner reflector 100, such as RCS. The reflector 1 can be obtained by changing the opening 104 of the virtual triangular pyramidal corner reflector 100 from a regular triangle to a regular hexagon.

  In the corner reflector 1 of the present invention, as can be seen from FIG. 3B, the first surface 11, the second surface 12, and the third surface 13 are formed in the plane formed by the virtual triangular pyramid opening 104. The actual opening 14 has a regular hexagonal shape. That is, as shown in FIG. 2B and FIG. 2C, in each of the virtual three right-angled isosceles triangles 101 to 103, an end portion 105 including two equal angles is provided. It removes so that the actual opening part 14 may become a regular hexagon. Thereby, the pentagonal first surface 11 to the third surface 13 shown in FIG. 2B are obtained. At this time, the two angles θ in FIG. 2B are equal. Basically, the re-radiation characteristic of the corner reflector 1 is determined by a which is the length of the ridgeline 106 of the original (virtual) right-angled isosceles triangle. Thereby, the pentagon shape which is the first surface 11 to the third surface 13 is determined.

  As can be seen from the comparison between FIG. 1 and FIG. 3, the corner reflector 1 is equivalent to the virtual triangular pyramid-shaped corner reflector 100 with six end portions 105 removed at three locations. As can be seen from FIG. 1C, the portion from which the end portion 105 has been removed is not removed by other members and remains removed. Therefore, the incident electromagnetic wave is not reflected at the portion where the end portion 105 is removed, and goes straight to the rear of the corner reflector 1 as it is. As can be seen from FIG. 1A, for example, when viewed from the top surface, the third surface (bottom surface) 13 is visible.

  When the virtual triangular pyramidal corner reflector 100 is viewed from the front, the opening 104 is a regular triangle as shown in FIG. As shown by a solid line in FIG. 1 and a dotted line in FIG. 3B, the corner reflector 1 of the present invention has a virtual triangular pyramid corner reflector 100 so that the regular triangular opening 14 looks like a regular hexagon. This can be realized by removing (cutting out) the end portion 105 from the end portion. That is, as described above with reference to FIG. 2B, the two end portions 105 of the right-angled isosceles triangles 101 to 103 are cut away. Note that the plane (opening surface) formed by the opening 14 of the corner reflector 1 coincides with (includes) the plane (opening surface) formed by the opening of the virtual triangular pyramid-shaped corner reflector 100.

  The end portion 105 is a portion that does not contribute to the re-radiation of the electromagnetic wave in each of the virtual three right isosceles triangles 101 to 103 in the virtual triangular pyramid described above. By removing the end portion 105, the shapes of the first surface 11, the second surface 12, and the third surface 13 are defined as described above. Specifically, in each of the three virtual right-angled isosceles triangles 101 to 103, the end portion 105 including two equal angles is removed. The notched end portion (notched portion) 105 is an unnecessary portion that does not contribute to the reflection of electromagnetic waves according to the study of the present inventors.

  By removing the end portion 105 as described above, the corner reflector 1 of the present invention has a width W of about 33% when compared with the virtual triangular pyramidal corner reflector 100 assumed as described above. The height H can be reduced by about 33%. The depth D is determined based on the re-radiation characteristic of reflecting and re-radiating the incident electromagnetic wave, so there is no change. Thereby, the small corner reflector 1 can be manufactured while maintaining the reflection performance equivalent to the conventional one.

  Thus, by reducing the external dimensions of the corner reflector 1, the possibility of being installed in a place where there is no room for installation can be greatly improved, and the corner reflector 1 can be mounted in such a place. And embedding becomes possible. For example, it can be installed on cars, motorcycles, bicycles, building walls, utility poles, balustrades, rockets (including missiles, etc.), tamper-proof camouflaged poles (for sensors for level crossings, etc.). In addition to this, the external appearance is small even if it is installed in these, so that the external appearance is not impaired and it is not conspicuous, so that mischief can be prevented. Therefore, the corner reflector 1 of the present invention can be installed on a low RCS body or an object with large RCS fluctuation, and the detectability of these objects by a sensor such as a radar can be improved.

  The width W refers to a state in which the plane formed by the virtual triangular pyramid opening 104 (or the actual regular hexagonal opening 14) is perpendicular to the horizontal plane (hereinafter referred to as an upright state). When the corner reflector 1 is placed, the maximum width of the openings 14 and 104 is referred to. The height H refers to the maximum height of the openings 14 and 104 when the corner reflector 1 is placed in an upright state. 1 and 3 show the corner reflector 1 in an upright state, and W and H are the width and height of the corner reflector 1 in FIGS. 1 (B) and 3 (B). The depth D refers to the distance (the length of the perpendicular) between the plane formed by the openings 14 and 104 and the apex of the triangular pyramid when the corner reflector 1 is placed in an upright state. As described above, the values of W, H, and D in the corner reflector 1 and the virtual triangular pyramid-shaped corner reflector 100 are uniquely determined by determining the characteristics.

  FIG. 4 is an explanatory diagram of a corner reflector and shows an example of the reflection performance of the corner reflector 1 of the present invention. 4A shows the reflection performance in the horizontal direction by a polar coordinate display system, and FIG. 4B shows the reflection performance in the vertical direction by a polar coordinate display system.

  FIG. 4 shows an RSC pattern (in a range of 90 ° when viewed from the opening surface) by simulation when an electromagnetic wave having a frequency of 76.5 GHz is incident on the corner reflector 1 of the present invention. As described above, the reflection performance of the virtual triangular pyramidal corner reflector 100 corresponding to the corner reflector 1 of the present invention is RCS = about 15 dBm. As can be seen from FIGS. 4A and 4B, the corner reflector 1 of the present invention realizes RCS = about 15 dBsm in the horizontal direction and the vertical direction. Therefore, in the corner reflector 1 of the present invention, the RCS in the reflection is substantially equal to the RCS of the virtual triangular pyramid corner reflector 100 having the same shape as the virtual triangular pyramid. Thus, it can be seen that the end portion 105 is removed and the size is reduced without impairing the function as the corner reflector.

  Here, the horizontal direction is parallel to the horizontal plane when the corner reflector 1 is in an upright state, and the upper side 15 of the opening 14 of the corner reflector 1 (see FIGS. 1B to 1D). A plane containing The vertical direction means two virtual right angles that are perpendicular to the horizontal plane and form the edge 16 (see FIG. 1C) of the opening 14 of the corner reflector 1 when the corner reflector 1 is in an upright state. The direction of a plane including the sides of an isosceles triangle.

  In the horizontal plane, as shown in FIG. 4A, symmetry is also obtained in the reflection characteristics. This is because the shape of the corner reflector 1 of the present invention is plane symmetric when the horizontal plane is used as a reference. On the other hand, in the vertical plane, as shown in FIG. 4B, symmetry is not obtained in the reflection characteristics. This is because the shape of the corner reflector 1 of the present invention is not plane-symmetric when the vertical plane is used as a reference.

  In manufacturing the corner reflector 1 of the present invention, the end portion 105 may actually be removed from the prepared triangular pyramid-shaped corner reflector. In addition, the pentagonal first surface 11, the second surface 12, and the third surface 13 are bonded to each other so that the opposite isosceles sides of the adjacent surfaces are aligned with each other without performing the removal. May be. Furthermore, you may make it produce the shape of the corner reflector 1 of this invention by plastic injection molding, for example.

  In the corner reflector 1 of the present invention, each of the first surface 11, the second surface 12, and the third surface 13 is a surface that is an inner surface of a virtual triangular pyramid that reflects electromagnetic waves. Therefore, the corner reflector 1 of the present invention reflects the electromagnetic wave incident on the inside thereof from the opening surface 14 on each of the three surfaces constituting the corner reflector 1 (thus reflecting three times), and again in the incident direction. Re-radiates in a direction parallel to Thereby, the said edge part 105 can be removed, without impairing the function as a corner reflector.

  On the other hand, in the corner reflector 1 of the present invention, each of the first surface 11, the second surface 12, and the third surface 13 contributes to re-radiation in a direction parallel to the incident direction of the electromagnetic wave. There is no region that does not contribute to radiation. Therefore, the corner reflector 1 of the present invention re-radiates the electromagnetic wave in the direction parallel to the incident direction and substantially eliminates re-radiation in directions other than the direction in the reflection (as in the case of the antenna). (Because of the re-radiation from the aperture, the beam has a spread). In other words, the corner reflector 1 of the present invention reflects (re-radiates) almost all of the incident electromagnetic wave (except for the portion that travels straight backward consisting of the portion corresponding to the end portion 105) in the incident direction. Thereby, the corner reflector 1 of the present invention can prevent the incident electromagnetic wave from being irregularly reflected (scattered) in an unnecessary direction, and the transmitter that is the source of the electromagnetic wave by efficient re-radiation can be prevented. Even if the output is reduced, a sufficient reflected wave can be obtained, so that the transmitter can be made smaller.

  Actually, in the corner reflector 1 of the present invention, in each of the members of the first surface 11, the second surface 12, and the third surface 13, the electromagnetic wave reflection is reflected on the surface corresponding to the inner surface so as to reflect the electromagnetic wave. A body is provided. The electromagnetic wave reflector is made of, for example, a metal. Specifically, for example, a metal foil such as aluminum, brass, or copper is attached to the surface corresponding to the inner surface of each of the members made of plastic or metal with an adhesive. A thin film such as aluminum may be deposited on the surface corresponding to the inner surface of each member.

  In each of the members of the first surface 11, the second surface 12, and the third surface 13, the surface corresponding to the inner surface may be a mirror surface that reflects light. As a result, a corner reflector that re-emits (reflects) incident light in a direction parallel to the incident direction, and that does not scatter unnecessary light in directions other than the incident direction, particularly for visible light in electromagnetic waves. 1 can be realized. Thereby, the versatility of the corner reflector 1 can be improved, and the utilization in the various field | areas which were not used conventionally is attained. For example, it can be used as a reflection reference in distance measurement performed using a laser. The mirror surface can be obtained by polishing the surface of the metal film deposited on the surface as described above.

  FIG. 5 is an explanatory diagram of a corner reflector and shows an example of installation of the corner reflector 1 of the present invention.

  For example, as shown in FIG. 5 (A), the corner reflector 1 of the present invention is provided with an installation base 17, and the installation base 17 is fixed on an installation symmetrical object (not shown), thereby transmitting a transmitter (radar). It can be provided at a predetermined installation position. Moreover, the corner reflector 1 of this invention is embedded in the installation symmetrical object 200, as shown, for example in FIG.5 (B). The opening 14 is a cavity 202. In this case, the corner reflector 1 is covered with a cover 201 made of a substance that easily transmits at the use frequency of electromagnetic waves. The cover 201 may be omitted.

  As mentioned above, although this invention was demonstrated according to the embodiment, according to this invention, the following aspects are grasped | ascertained.

(Appendix 1) A corner reflector that re-radiates incident electromagnetic waves in a direction parallel to the incident direction,
It consists of a first surface, a second surface and a third surface made of pentagons having the same shape.
The first surface, the second surface, and the third surface have a shape in which three virtual isosceles triangles having the same shape can be obtained by extending predetermined three sides forming the pentagon,
Arranging the first surface, the second surface and the third surface so that the virtual three isosceles right triangles form a virtual triangular pyramid having an equilateral triangular opening;
In the plane formed by the opening of the virtual triangular pyramid, the virtual three triangular right angle two so that the actual opening formed by the first surface, the second surface, and the third surface is a regular hexagon. Defining the pentagon as the first surface, the second surface and the third surface by removing an end including two corners of equal angles in each of the equilateral triangles;
A corner reflector, wherein each of the first surface, the second surface, and the third surface serves as an inner surface of the virtual triangular pyramid.

(Appendix 2) A corner reflector that re-radiates incident electromagnetic waves in a direction parallel to the incident direction,
It consists of a first surface, a second surface and a third surface that have the same shape,
The first surface, the second surface, and the third surface have a shape in which three virtual right-angled isosceles triangles having the same shape can be obtained by extending the plane.
Arranging the first surface, the second surface and the third surface so that the virtual three isosceles right triangles form a virtual triangular pyramid having an equilateral triangular opening;
In the virtual triangular pyramid, the shapes of the first surface, the second surface, and the third surface are removed by removing portions that do not contribute to re-radiation of electromagnetic waves in each of the virtual three right isosceles triangles. And
A corner reflector, wherein each of the first surface, the second surface, and the third surface serves as an inner surface of the virtual triangular pyramid.

(Appendix 3) A corner reflector that re-radiates incident electromagnetic waves in a direction parallel to the incident direction,
It consists of a first surface, a second surface and a third surface that have the same shape,
The first surface, the second surface, and the third surface have a shape in which three virtual right-angled isosceles triangles having the same shape can be obtained by extending the plane.
Arranging the first surface, the second surface and the third surface so that the virtual three isosceles right triangles form a virtual triangular pyramid having an equilateral triangular opening;
In each of the first surface, the second surface, and the third surface, the surface that becomes the inner surface of the virtual triangular pyramid reflects electromagnetic waves,
A corner reflector, wherein the RCS in the reflection is substantially equivalent to a triangular pyramid corner reflector having the same shape as the virtual triangular pyramid.

(Appendix 4) A corner reflector that re-radiates incident electromagnetic waves in a direction parallel to the incident direction,
It consists of a first surface, a second surface and a third surface that have the same shape,
The first surface, the second surface, and the third surface have a shape in which three virtual right-angled isosceles triangles having the same shape can be obtained by extending the plane.
Arranging the first surface, the second surface and the third surface so that the virtual three isosceles right triangles form a virtual triangular pyramid having an equilateral triangular opening;
In each of the first surface, the second surface, and the third surface, the surface that becomes the inner surface of the virtual triangular pyramid reflects electromagnetic waves,
In the reflection, the corner reflector is characterized in that the electromagnetic wave is re-radiated in a direction parallel to the incident direction, and re-radiation in a direction other than the direction is substantially eliminated.

(Supplementary Note 5) Any one of Supplementary Notes 1 to 4, wherein a surface that is an inner surface of the virtual triangular pyramid in each of the first surface, the second surface, and the third surface is a mirror surface that reflects light. Corner reflector according to crab.

  According to the present invention, in the corner reflector, the first opening is formed so that the actual opening is a regular hexagon in the plane formed by the opening of the virtual triangular pyramid formed by the first surface, the second surface, and the third surface, for example. In each of the three virtual right isosceles triangles formed by the first surface, the second surface, and the third surface, an end portion including two equal angles is removed. That is, the corner reflector of the present invention removes a portion where the electromagnetic wave incident on the inside cannot be re-radiated. Thereby, compared with the conventional triangular pyramid-shaped corner reflector which has equivalent reflective performance, the external shape of a corner reflector can be reduced in size, without reducing re-radiation performance. As a result, according to the corner reflector of the present invention, the installation space can be reduced, and it can be installed even in a place where there is no margin in the conventional installation space. Even if it is installed in the installation space, it is small and inconspicuous, so that it can be prevented from being mischievous and the appearance can be prevented from being damaged.

An example of the structure of the corner reflector of this invention is shown. It is explanatory drawing of the corner reflector of FIG. Fig. 2 shows a virtual triangular pyramidal corner reflector corresponding to the corner reflector of the present invention of Fig. 1; An example of the reflective performance of the corner reflector of this invention is shown. An example of installation of the corner reflector of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Corner reflector 11, 12, 13 1st surface, 2nd surface, 3rd surface 100 Virtual triangular pyramid type corner reflector

Claims (3)

A corner reflector that re-radiates incident electromagnetic waves in a direction parallel to the incident direction,
It consists of a first surface, a second surface and a third surface made of pentagons having the same shape.
The first surface, the second surface, and the third surface have a shape in which three virtual isosceles triangles having the same shape can be obtained by extending predetermined three sides forming the pentagon,
Arranging the first surface, the second surface and the third surface so that the virtual three isosceles right triangles form a virtual triangular pyramid having an equilateral triangular opening;
In the plane formed by the opening of the virtual triangular pyramid, the virtual three triangular right angle two so that the actual opening formed by the first surface, the second surface, and the third surface is a regular hexagon. Defining the pentagon as the first surface, the second surface and the third surface by removing an end portion including two corners of equal angles in each of the equilateral triangles;
A corner reflector, wherein each of the first surface, the second surface, and the third surface is an inner surface of the virtual triangular pyramid that reflects electromagnetic waves. A corner reflector that re-radiates incident electromagnetic waves in a direction parallel to the incident direction,
It consists of a first surface, a second surface and a third surface that have the same shape,
The first surface, the second surface, and the third surface have a shape in which three virtual right-angled isosceles triangles having the same shape can be obtained by extending the plane.
Arranging the first surface, the second surface and the third surface so that the virtual three isosceles right triangles form a virtual triangular pyramid having an equilateral triangular opening;
In the virtual triangular pyramid, the shapes of the first surface, the second surface, and the third surface are removed by removing portions that do not contribute to re-radiation of electromagnetic waves in each of the virtual three right isosceles triangles. And
A corner reflector, wherein each of the first surface, the second surface, and the third surface serves as an inner surface of the virtual triangular pyramid. A corner reflector that re-radiates incident electromagnetic waves in a direction parallel to the incident direction,
It consists of a first surface, a second surface and a third surface that have the same shape,
The first surface, the second surface, and the third surface have a shape in which three virtual right-angled isosceles triangles having the same shape can be obtained by extending the plane.
Arranging the first surface, the second surface and the third surface so that the virtual three isosceles right triangles form a virtual triangular pyramid having an equilateral triangular opening;
In each of the first surface, the second surface, and the third surface, the surface that becomes the inner surface of the virtual triangular pyramid reflects electromagnetic waves,
A corner reflector, wherein the RCS in the reflection is substantially equivalent to a triangular pyramid corner reflector having the same shape as the virtual triangular pyramid.

Images