Patent ID: 11942697
Assignee: NEC CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. An antenna system comprising:
an antenna configured to emit electromagnetic wave; and
a phase control device configured to control a phase of the electromagnetic wave, wherein
the phase control device comprises:
a phase control lens including at least two metamaterial boards arranged in a first direction and separated from each other, each metamaterial board shifting a phase of electromagnetic wave passing therethrough; and
a control circuit configured to control admittance distribution in a plane perpendicular to the first direction of each metamaterial board, wherein
a principal surface of each metamaterial board is perpendicular to the first direction,
the metamaterial board comprises a two-dimensional array of three-dimensional units that are two-dimensionally arranged in a plane parallel to the principal surface and is configured to shift the phase of electromagnetic wave passing therethrough,
the control circuit controls each three-dimensional unit to adjust a phase delay amount of each three-dimensional unit provided to the electromagnetic wave,
each three-dimensional unit is configured in such a manner that a state of that can be switched to control the phase delay amount of each three-dimensional unit,
the control circuit switches the state of each three-dimensional unit, and
when the state of each three-dimensional unit is changed, the phase delay amount of each three-dimensional unit provided to the electromagnetic wave is changed.