Reflection apparatus and system
A reflection apparatus which reflects a radio wave includes a first device including first units each including a first base body having a first surface and a second surface provided along an emission direction of the reflected wave, a first element provided on the first surface, and a second element provided on the second surface to be shifted in position from the first element in the emission direction, and a second device including second units each including a second base body having a third surface and a fourth surface provided along the emission direction, a third element provided on the third surface, and a fourth element provided on the fourth surface, and the first device is provided separated from the second device, and a relative positional relationship between the first device and the second device in a direction along the second surface is adjustable.
1. A reflection apparatus which reflects a radio wave, comprising
a first device and a second device which are provided along an emission direction of a reflected wave, wherein
the first device includes
a plurality of first units each including
a first base body which has a first surface and a second surface provided along the emission direction of the reflected wave,
a first element which is provided on the first surface, and
a second element which is provided on the second surface to be shifted in position from the first element in the emission direction of the reflected wave,
the second device includes
a plurality of second units each including
a second base body which has a third surface and a fourth surface provided along the emission direction of the reflected wave,
a third element which is provided on the third surface, and
a fourth element which is provided on the fourth surface, and
the first device is provided separated from the second device, and a relative positional relationship between the first device and the second device in a direction along the second surface is adjustable.
2. The reflection apparatus according to claim 1 , wherein
a phase of the reflected wave is determined by
surface areas of the first element and the second element,
a relative positional relationship between the first element and the second element,
a thickness of the first base body,
surface areas of the third element and the fourth element, and
a thickness of the second base body.
3. The reflection apparatus according to claim 2 , wherein
the plurality of first units and the plurality of second units are provided at a plurality of positions along a specific direction along the first surface, such that phases of the reflected wave are different from each other.
4. The reflection apparatus according to claim 2 , wherein
the plurality of first units and the plurality of second units are provided such that the reflected wave propagates in a specific direction.
5. The reflection apparatus according to claim 2 , further comprising
an adjustment apparatus which adjusts a relative positional relationship between the first device and the second device.
6. The reflection apparatus according to claim 2 , wherein
a length of one side of each of the plurality of first units is 0.3λ or more and 0.6λ or less where λ is a wavelength of a radio wave incident on the reflection apparatus.
7. The reflection apparatus according to claim 2 , wherein
the first element, the second element, and the third element each have a polygonal shape or a shape curved at least in part.
8. The reflection apparatus according to claim 2 , wherein
the first element transmits a specific linearly polarized wave or a specific circularly polarized wave.
9. The reflection apparatus according to claim 2 , wherein
the first base body and the second base body each have a polygonal shape or a shape curved at least in part.
10. The reflection apparatus according to claim 1 , wherein
the plurality of first units and the plurality of second units are provided at a plurality of positions along a specific direction along the first surface, such that phases of the reflected wave are different from each other.
11. The reflection apparatus to claim 10 , wherein
the plurality of first units and the plurality of second units are provided such that the reflected wave propagates in a specific direction.
12. The reflection apparatus according to claim 10 , further comprising
an adjustment apparatus which adjusts a relative positional relationship between the first device and the second device.
13. The reflection apparatus according to any one of claim 1 wherein
the plurality of first units and the plurality of second units are provided such that the reflected wave propagates in a specific direction.
14. The reflection apparatus according to any one of claim 1 , further comprising
an adjustment apparatus which adjusts a relative positional relationship between the first device and the second device.
15. The reflection apparatus according to any one of claim 1 , wherein
a length of one side of each of the plurality of first units is 0.3λ or more and 0.6λ or less where λ is a wavelength of a radio wave incident on the reflection apparatus.
16. The reflection apparatus according to any one of claim 1 , wherein
the first element, the second element, and the third element each have a polygonal shape or a shape curved at least in part.
17. The reflection apparatus according to any one of claim 1 , wherein
the first element transmits a specific linearly polarized wave or a specific circularly polarized wave.
18. The reflection apparatus according to any one of claim 1 , wherein
the first base body and the second base body each have a polygonal shape or a shape curved at least in part.
19. The reflection apparatus according to any one of claim 1 , wherein
the first element and the third element are conductors having a frequency selective surface (FSS).
20. A system comprising:
the reflection apparatus according to any one of claim 1 ; and
a radio wave radiation apparatus which radiates a radio wave incident on the reflection apparatus.