Abstract: To provide a dual polarized antenna capable of reducing correlation between antenna elements. A dual polarized antenna is constituted by a vertically polarized antenna and a horizontally polarized antenna formed on a printed circuit board and radiates two kinds of polarized waves.

Abstract: The present invention provides a small, thin, and cheap foldable broadband antenna that is valid in a wide band and, moreover, can be manufactured at low cost, and a method of using the same. A foldable broadband antenna includes: a plate conductor having a rectangular outer shape and in which a slit is formed from a long side so as be orthogonal to a longitudinal direction; a side conductor provided perpendicularly from a side parallel with the slit in the plate conductor; and a back conductor disposed in parallel with the plate conductor from an end of the side conductor toward the slit. In the plate conductor, a coaxial external conductor of a coaxial cable is connected to the side opposite to the side conductor with the slit therebetween, and a coaxial central conductor of the coaxial cable is electrically connected to the same side as that of the side conductor.

Abstract: To suppress a loss in the operation due to electromagnetic coupling of a plurality of antenna elements which boot up reading/writing action of RFID tags that are attached to a large number of densely placed commodity media. A commodity managing antenna for booting up reading/writing action of RFID tags attached to commodity media that are densely stored on a shelf comprises: a plurality of loop-type antenna elements arranged in parallel at a constant interval on the shelf where the commodity media are densely stored; a first switch for selectively supplying electricity to one of the antenna elements; and a plurality of second switches inserted to each loop of the antenna elements which, when one of the antenna elements to which the electricity is supplied by the first switch is resonating, electrically disconnect the loops of remaining antenna elements so that those antenna elements become non-resonant.

Abstract: The present invention provides a small, thin, and cheap foldable broadband antenna that is valid in a wide band and, moreover, can be manufactured at low cost, and a method of using the same. A foldable broadband antenna includes: a plate conductor having a rectangular outer shape and in which a slit is formed from a long side so as be orthogonal to a longitudinal direction; a side conductor provided perpendicularly from a side parallel with the slit in the plate conductor; and a back conductor disposed in parallel with the plate conductor from an end of the side conductor toward the slit. In the plate conductor, a coaxial external conductor of a coaxial cable is connected to the side opposite to the side conductor with the slit therebetween, and a coaxial central conductor of the coaxial cable is electrically connected to the same side as that of the side conductor.

Abstract: In an antenna, a first flat radiating element is placed longitudinally. A second flat radiating element is located opposite to the first flat radiating element. The first and the second radiating element are connected to each other at their lower end portions. A third flat radiating element is longitudinally located below the second flat radiating element. A central conductor of a coaxial cable is connected to the lower end portions of the first and the second flat radiating elements. An outer conductor of the coaxial cable is connected to an upper end portion of the third flat radiating element. The coaxial cable is located parallel to the third flat radiating element.

Abstract: In order to improve the reception capability of a portable terminal device while waiting for calls from a satellite, a small reflecting plate (9) in the form of a saucer is disposed below a rod-shaped satellite communication antenna (7) which is folded to hold downwardly when the portable terminal device is in the state of on-hook, waiting for calls.

Abstract: In an antenna, a first flat radiating element is placed longitudinally. A second flat radiating element is located opposite to the first flat radiating element. The first and the second radiating element are connected to each other at their lower end portions. A third flat radiating element is longitudinally located below the second flat radiating element. A central conductor of a coaxial cable is connected to the lower end portions of the first and the second flat radiating elements. An outer conductor of the coaxial cable is connected to an upper end portion of the third flat radiating element. The coaxial cable is located parallel to the third flat radiating element.

Abstract: A physically small antenna having a wide bandwidth that facilitates the inspection of the attachment to the printed circuit board. The antenna is provided with a dielectric plate having a rear surface, a conductive plate disposed on the rear surface, a vertical element extending in a direction perpendicular to the rear surface. The vertical element includes a dielectric bar, an end of which is attached to the rear surface, and a conductive shell covering a side and an opposite end of the dielectric bar to be attached to the conductive plate.

Abstract: A cylindrical reflector having a through hole in conformity with the shape of an elemental portion is fitted to the elemental portion in a LAN antenna in which the elemental portion encloses a linear conductor therein and projects from a base table, and further, the reflector is turned to be set at a position at which the directivity is formed in a specific direction. A flat plate or a curved plate forming a reflecting surface of the reflector is arbitrarily set, thus forming a desired radiation pattern of a beam.

Abstract: A monopole antenna element being low in price and usable in a wide band, for which fine adjustment of input impedance and resonance frequency is easily carried out. The monopole antenna in accordance with the present invention comprises a top plate having an elliptical shape, a printed board, and a monopole that is joined with the center of the top plate at one end. The top plate may assume a shape other than ellipse when being symmetrical with respect to two orthogonal axes passing through the center of the area of the top plate, in which the lengths of the axes are different from each other. Besides, the top plate may include a cutaway(s) to reduce field emissions having horizontal components. In addition, the top plate may be provided with a fold along with an axis passing through the center of the area of the top plate so that adjustments for input impedance, etc. of the antenna can be carried out. On the other hand, the monopole may have a bend part for adjusting input impedance, etc. of the antenna.

Abstract: In an antenna apparatus and the electronic toll collection (hereinafter, abbreviated to an ETC) system using it, an antenna apparatus (2) is provided in a space over a lane (3) through which an automobile (1) having ETC on-vehicle equipment (10) passes. An antenna which the antenna apparatus has radiates a radio wave having a radio beam emitted area (21) of a radio wave to communicate with the ETC on-vehicle equipment and, thereby, electronic toll collection is performed for the passing automobile. It is an object of the present invention to provide an antenna apparatus which is controllable so that the ETC on-vehicle equipment is in the center of the radio beam emitted area of the antenna apparatus, and also to provide an ETC system using it. The antenna apparatus integrates an antenna and a light emitting unit.

Abstract: A physically small antenna having a wide bandwidth that facilitates the inspection of the attachment to the printed circuit board. The antenna is provided with a dielectric plate having a rear surface, a conductive plate disposed on the rear surface, a vertical element extending in a direction perpendicular to the rear surface. The vertical element includes a dielectric bar, an end of which is attached to the rear surface, and a conductive shell covering a side and an opposite end of the dielectric bar to be attached to the conductive plate.

Abstract: A monopole antenna element being low in price and usable in a wide band, for which fine adjustment of input impedance and resonance frequency is easily carried out. The monopole antenna in accordance with the present invention comprises a top plate having an elliptical shape, a printed board, and a monopole that is joined with the center of the top plate at one end. The top plate may assume a shape other than ellipse when being symmetrical with respect to two orthogonal axes passing through the center of the area of the top plate, in which the lengths of the axes are different from each other. Besides, the top plate may include a cutaway(s) to reduce field emissions having horizontal components. In addition, the top plate may be provided with a fold along with an axis passing through the center of the area of the top plate so that adjustments for input impedance, etc. of the antenna can be carried out. On the other hand, the monopole may have a bend part for adjusting input impedance, etc. of the antenna.

Abstract: A cylindrical reflector having a through hole in conformity with the shape of an elemental portion is fitted to the elemental portion in a LAN antenna in which the elemental portion encloses a linear conductor therein and projects from a base table, and further, the reflector is turned to be set at a position at which the directivity is formed in a specific direction. A flat plate or a curved plate forming a reflecting surface of the reflector is arbitrarily set, thus forming a desired radiation pattern of a beam.

Abstract: In a radiation element comprising helical element (1), diode (2), and helical element (3), since helical element (1) is insulated from helical element (3) for a high-frequency signal when diode (2) is off, only helical element (1) operates as a radiation element. In the radiation element comprising helical element (1), diode (2), and helical element (3), since there is conductivity between helical elements (1) and (3) for a high-frequency when diode (2) is on, helical elements (1) and (3) operate as connected.

Abstract: In an antenna apparatus and the electronic toll collection (hereinafter, abbreviated to an ETC) system using it, an antenna apparatus (2) is provided in a space over a lane (3) through which an automobile (1) having ETC on-vehicle equipment (10) passes. An antenna which the antenna apparatus has radiates a radio wave having a radio beam emitted area (21) of a radio wave to communicate with the ETC on-vehicle equipment and, thereby, electronic toll collection is performed for the passing automobile. It is an object of the present invention to provide an antenna apparatus which is controllable so that the ETC on-vehicle equipment is in the center of the radio beam emitted area of the antenna apparatus, and also to provide an ETC system using it. The antenna apparatus integrates an antenna and a light emitting unit.

Abstract: A helical antenna comprising a cylindrical dielectric member 1, four spiral conductors 2a to 2d which are wound around the outer wall of the cylindrical dielectric member 1, four spiral conductors 3a to 3d which are attached to the inner wall of the cylindrical dielectric member 1, and power supply circuits 4, 5 for supplying high-frequency power to the spiral conductors 2a to 2d and the spiral conductors 3a to 3d respectively. That is, the spiral conductors serving as radiation elements are disposed at the outside and inside of the cylindrical dielectric member, and the outer and inner conductors are operated as independent helical antennas. These spiral conductors are connected to the power supply circuits for supplying the high-frequency power having desired amplitude and phase.

Abstract: A small helical antenna with broad fan radiation pattern provides easy impedance matching and high radiation efficiency. It is composed of a dielectric cylinder, a plurality of radiation conductors arranged on the outer surface of the dielectric cylinder, a matching conductor arranged on the upper inner surface of the dielectric cylinder that cancels inductive reactance, and a plurality of feeder conductors arranged near the radiation conductors on the lower inner surface of the dielectric cylinder and lowering the impedance of the helical antenna.