Abstract: A patch antenna includes a flat-plate radiating element; and a metal wall provided outside a peripheral edge of the radiating element, such that a wall surface of the metal wall intersects a line connecting a center of the radiating element and a feeding point. An antenna device for a vehicle includes: the patch antenna; a housing installed in a predetermined orientation at a predetermined position of the vehicle; and a support supporting the patch antenna such that the patch antenna is used for vertically polarized waves when the housing is installed in the predetermined orientation at the predetermined position.

Abstract: An antenna device to be mounted on a vehicle, including a ground plate having a planar shape; and an antenna element which is a resonant type, is provided at a position so as not to overlap with the ground conductor within a plane substantially parallel to the ground conductor, and is configured to transmit or receive a polarized wave parallel to the ground conductor. A rectangular notch is formed in the ground plate to have both a right and left edge portions with a predetermined width being left, and the antenna element is provided at a position overlapping with the notch in a plane substantially parallel to the ground plate.

Abstract: An antenna device has a configuration in which a feeding point is located at a position that is distant from an outer periphery of a ground conductor plate to a center side and that would correspond to polarized waves parallel to the ground conductor plate. The antenna devices includes a ground conductor plate and an antenna element. The antenna element includes a first vertical portion and a second vertical portion which are erected substantially perpendicularly from the ground conductor plate and a first parallel portion, a second parallel portion, and a third parallel portion which extend substantially parallel to the ground conductor plate. An end portion, in the ?Z direction, of the first vertical portion serves as a feeding point and is located at a position that is distant from an outer periphery of the ground conductor plate to a center side.

Abstract: A microstrip antenna has two feed points. The microstrip antenna includes a feeder circuit which is configured to feed, to the two feed points, electric signals whose phases are different by 90° from each other. The feeder circuit includes a Wilkinson coupler unit and a phase-shift unit each of which is formed as a lumped constant circuit.

Abstract: A microstrip antenna has two feed points. The microstrip antenna includes a feeder circuit which is configured to feed, to the two feed points, electric signals whose phases are different by 90° from each other. The feeder circuit includes a Wilkinson coupler unit and a phase-shift unit each of which is formed as a lumped constant circuit.

Abstract: An antenna device includes: an antenna base plate having a shape of a flat plate; a capacity loading plate of a top capacity loaded type monopole antenna, the capacity loading plate arranged in parallel with the antenna base plate; and a planar antenna arranged between the antenna base plate and the capacity loading plate. A size of at least a part of the capacity loading plate in a direction of width of the capacity loading plate is less than about ¼ wavelength of receiving frequency of the planar antenna, and edges of the capacity loading plate in the direction of width of the capacity loading plate are folded back so that the capacity loading plate has a meander shape extending in a direction of length of the capacity loading plate.

Abstract: An antenna device includes: an antenna base plate having a shape of a flat plate; a capacity loading plate of a top capacity loaded type monopole antenna, the capacity loading plate arranged in parallel with the antenna base plate; and a planar antenna arranged between the antenna base plate and the capacity loading plate. A size of at least a part of the capacity loading plate in a direction of width of the capacity loading plate is less than about ¼ wavelength of receiving frequency of the planar antenna, and edges of the capacity loading plate in the direction of width of the capacity loading plate are folded back so that the capacity loading plate has a meander shape extending in a direction of length of the capacity loading plate.

Abstract: In a planar antenna, a plate member is adapted to be electrically grounded. A radiating electrode is opposing the plate member with a gap and extending parallel to the plate member. A feeding pin is disposed at a center part of the radiating electrode, and adapted to feed power to the radiating electrode. At least one pair of short pins is electrically connecting the plate member and an outer edge of the radiating electrode at symmetrical positions relative to the feeding pin. The radiating electrode is formed with blank portions which are located at such positions that are on hypothetical straight lines connecting the feeding pin and the short pins.

Abstract: In a planar antenna, a plate member is adapted to be electrically grounded. A radiating electrode is opposing the plate member with a gap and extending parallel to the plate member. A feeding pin is disposed at a center part of the radiating electrode, and adapted to feed power to the radiating electrode. At least one pair of short pins is electrically connecting the plate member and an outer edge of the radiating electrode at symmetrical positions relative to the feeding pin. The radiating electrode is formed with blank portions which are located at such positions that are on hypothetical straight lines connecting the feeding pin and the short pins.

Abstract: In a microstrip antenna, a dielectric member is disposed on a grounded conductive plate. A patch antenna element is disposed on the dielectric member. Each of a plurality of conductive rods has an electrical length corresponding to one quarter of a wavelength at a resonance frequency of the microstrip antenna. The rods are arranged on an edge portion of a face of the conductive plate facing the patch antenna element, with an interval which is an electric length corresponding to a half or less of the wavelength at the resonance frequency, such that each of the rods extends perpendicularly to the conductive plate while one end thereof is electrically connected to the conductive plate.

Abstract: An antenna apparatus is mounted on a vehicle body provided with a spoiler made of an insulating resin. A feeder element is disposed in the spoiler such that the vehicle body serves as ground without providing a ground element in the spoiler.

Abstract: In a microstrip antenna, a dielectric member is disposed on a grounded conductive plate. A patch antenna element is disposed on the dielectric member. Each of a plurality of conductive rods has an electrical length corresponding to one quarter of a wavelength at a resonance frequency of the microstrip antenna. The rods are arranged on an edge portion of a face of the conductive plate facing the patch antenna element, with an interval which is an electric length corresponding to a half or less of the wavelength at the resonance frequency, such that each of the rods extends perpendicularly to the conductive plate while one end thereof is electrically connected to the conductive plate.

Abstract: An antenna apparatus is mounted on a vehicle body provided with a spoiler made of an insulating resin. A feeder element is disposed in the spoiler such that the vehicle body serves as ground without providing a ground element in the spoiler.