Patent attributes
According to one embodiment, an antenna apparatus includes a first phase shifter to shift a phase of a left-hand circularly polarized signal representing a left-hand circularly polarized wave; a second phase shifter to shift a phase of a right-hand circularly polarized signal representing a right-hand circularly polarized wave; a control circuit determining a first phase shift amount of the first phase shifter and a second phase shift amount of the second phase shifter based on a difference between a phase shift amount of the first phase shifter and a phase shift amount of the second phase shifter; and a radiating element radiating the left-hand circularly polarized wave and the right-hand circularly polarized wave based on the left-hand circularly polarized signal of which the phase is shifted by the first phase shift amount and the right-hand circularly polarized signal of which the phase is shifted by the second phase shift amount.
