Radio wave reflection device

Abstract

One of the objectives of this radio wave reflector using liquid crystal is to control the reflection angle of radio waves in a specific wavelength band and suppress the decrease in the intensity of reflected radio waves. [Solution] The radio wave reflector includes a radio wave selective layer containing a photonic crystal that selects radio waves in a predetermined wavelength band, and a radio wave reflector that reflects radio waves in the predetermined wavelength band. The radio wave selective layer may be placed on top of the radio wave incident surface of the radio wave reflector and transmit only radio waves in the predetermined wavelength band. The radio wave selective layer may be placed opposite the radio wave incident surface of the radio wave reflector and reflect radio waves in the predetermined wavelength band in the direction of the radio wave incident surface of the radio wave reflector.

Claims

1. A radio wave reflective device comprising a radio wave selective layer containing a photonic crystal that selects radio waves in a predetermined wavelength band, and a radio wave reflector that reflects radio waves in the predetermined wavelength band.

2. The radio wave reflecting device according to claim 1, wherein the radio wave selective layer is arranged on the incident surface of the radio wave reflector and transmits only radio waves of the predetermined wavelength band.

3. The radio wave reflecting device according to claim 1, wherein the radio wave selective layer is arranged opposite to the radio wave incident surface of the radio wave reflector and reflects radio waves of a predetermined wavelength band in the direction of the radio wave incident surface of the radio wave reflector.

4. The radio wave reflecting device according to claim 1, wherein the radio wave reflector includes at least one first electrode disposed on the side of the radio wave selective layer, a second electrode disposed on the opposite side of the first electrode from the radio wave selective layer, and a liquid crystal layer disposed between the first electrode and the second electrode.

5. The at least one first electrode comprises a plurality of first electrodes. The plurality of first electrodes are arranged in a matrix, The radio wave reflector according to claim 4, wherein each of the plurality of first electrodes is connected to a transistor and its potential is controlled individually.

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