Abstract: A dielectric substrate includes a plurality of pattern layers. A ground plate to be used as a ground plane is formed in a first pattern layer of the dielectric substrate. A functional unit includes a plurality of conductive patches that are parasitic patterns formed in a second pattern layer different from the first pattern layer. The conductive patches are periodically arranged, and sides of the conductive patches along at least one direction are set at a length to cause resonance of a radio wave that propagates through a surface of the dielectric substrate.

Abstract: An antenna device includes: a substrate at which a transmission antenna and a reception antenna are provided; and a radome provided facing the substrate, the radome includes: a transmission side radome facing the transmission antenna; and a reception side radome facing the reception antenna, and a region in which a gain is increased as compared with a case in which the radome is not provided in a beam pattern in a plane of the transmission antenna including a predetermined direction and a region in which a gain is increased as compared with a case in which the radome is not provided in a beam pattern in the plane of the reception antenna are at different angular positions.

Abstract: An antenna device for transmitting and receiving radio waves by an antenna element formed as a conductive pattern on a substrate, and the antenna element includes: a first element part which is electrically connected to a power supply line; and two second element parts which are electrically connected to the first element part via connection lines, the connection lines being different from the power supply line.

Abstract: An antenna device includes: an antenna unit provided as a conductive pattern on a substrate; and a propagation preventive unit which is provided adjacent to the antenna unit and prevents propagation of radiation waves of the antenna unit along the substrate, and the propagation preventive unit is provided as a conductive pattern on the substrate, has plural patches arranged in a prescribed pattern, and has, at an end on a side of the antenna unit, a stepped structure in which a distance from a position of the antenna unit to one of the patches closest to the position of the antenna unit varies by a prescribed interval every time the position in an extension direction of a feed line of the antenna unit is changed by a prescribed distance.

Abstract: An antenna device includes: a substrate at which a transmission antenna and a reception antenna are provided; and a radome provided facing the substrate, the radome includes: a transmission side radome facing the transmission antenna; and a reception side radome facing the reception antenna, and a region in which a gain is increased as compared with a case in which the radome is not provided in a beam pattern in a plane of the transmission antenna including a predetermined direction and a region in which a gain is increased as compared with a case in which the radome is not provided in a beam pattern in the plane of the reception antenna are at different angular positions.

Abstract: There is provided a microstrip antenna. A plurality of dielectric layers are stacked. An antenna is provided on the uppermost dielectric layer of the plurality of dielectric layers. Conductor layers are respectively provided on lower surfaces of the dielectric layers. The conductor layers have different dimensions in a plane direction thereof so that electromagnetic waves to be radiated from the conductor layers are cancelled with each other.

Abstract: An antenna device for transmitting and receiving radio waves by an antenna element formed as a conductive pattern on a substrate, and the antenna element includes: a first element part which is electrically connected to a power supply line; and two second element parts which are electrically connected to the first element part via connection lines, the connection lines being different from the power supply line.

Abstract: An antenna device includes: an antenna unit provided as a conductive pattern on a substrate; and a propagation preventive unit which is provided adjacent to the antenna unit and prevents propagation of radiation waves of the antenna unit along the substrate, and the propagation preventive unit is provided as a conductive pattern on the substrate, has plural patches arranged in a prescribed pattern, and has, at an end on a side of the antenna unit, a stepped structure in which a distance from a position of the antenna unit to one of the patches closest to the position of the antenna unit varies by a prescribed interval every time the position in an extension direction of a feed line of the antenna unit is changed by a prescribed distance.

Abstract: An antenna apparatus includes: an antenna array that: i) includes a plurality of antennas arranged next to each other in a predetermined direction, ii) is supplied with power from a power source, and iii) transmits radio waves; and a plurality of dummy antennas that: i) are provided on opposite sides of the antenna array in the predetermined direction, ii) are supplied with power from an electric field leaked from the antennas of the antenna array, and iii) transmit radio waves. Thus, it is possible to prevent an accuracy of detecting a target from deteriorating.

Abstract: There is provided a microstrip antenna. A plurality of dielectric layers are stacked. An antenna is provided on the uppermost dielectric layer of the plurality of dielectric layers. Conductor layers are respectively provided on lower surfaces of the dielectric layers. The conductor layers have different dimensions in a plane direction thereof so that electromagnetic waves to be radiated from the conductor layers are cancelled with each other.

Abstract: An antenna apparatus includes: an antenna array that: i) includes a plurality of antennas arranged next to each other in a predetermined direction, ii) is supplied with power from a power source, and iii) transmits radio waves; and a plurality of dummy antennas that: i) are provided on opposite sides of the antenna array in the predetermined direction, ii) are supplied with power from an electric field leaked from the antennas of the antenna array, and iii) transmit radio waves. Thus, it is possible to prevent an accuracy of detecting a target from deteriorating.