Patent ID: 11949165
Assignee: NEC CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An antenna device comprising:
a first directional antenna oriented in a first direction and configured to transmit and receive a signal with a first polarization;
a second directional antenna oriented in a second direction opposite to the first direction and configured to transmit and receive a signal with the first polarization;
a third directional antenna oriented in a third direction obtained by horizontally rotating the second direction by 90° or 180° and configured to transmit and receive a signal with a second polarization orthogonal to the first polarization;
a fourth directional antenna oriented in a fourth direction opposite to the third direction and configured to transmit and receive a signal with the second polarization;
a first feeding point provided in the first directional antenna;
a second feeding point provided in the second directional antenna and placed in phase with the first feeding point;
a third feeding point provided in the third directional antenna;
a fourth feeding point provided in the fourth directional antenna and placed in opposite phase to the third feeding point,
wherein the first directional antenna, the second directional antenna, the third directional antenna, and the fourth directional antenna are patch antennas,
the first feeding point and the second feeding point are placed so as to overlap each other when viewed in a plan view from an antenna surface side of the first directional antenna, and
the third feeding point and the fourth feeding point are placed so as to overlap each other when viewed in a plan view from an antenna surface side of the third directional antenna,
the first directional antenna and the second directional antenna are placed opposite to each other and facing in opposite directions,
the third directional antenna and the fourth directional antenna are placed opposite to each other and facing in opposite directions, and
the antenna device includes an opposite-phase combination circuit configured to combine a received signal received by the third directional antenna and a received signal received by the fourth directional antenna in opposite phases.