Abstract: An antenna system includes a substrate, a ground on the substrate, a first radiator having a helical shape near a side of the substrate and having a central axis substantially in parallel to a side of the ground, and a high frequency circuit electrically connected to a part of the first radiator. In the antenna system, ground-induced degradation of antenna gain can be reduced, and matching can be performed at an operating frequency through adjustment of a winding of the first radiator. Consequently, the radiation gain of the antenna system can be improved without an antenna matching circuit.

Abstract: An antenna device has a circular radiation plate with a diameter of substantially ½ wavelength in electric length faced to a ground plate with a first power supply port and a second power supply port in its periphery. The power supply ports are disposed at positions where straight lines connecting respective power supply ports to a midpoint of the radiation plate intersect at right angles. Four slits axisymmetric with respect the straight lines are disposed in radiation plate, and two sides of the periphery of each slit contact with each other.

Abstract: An antenna device has a first radiation plate and a second radiation plate of which a diameter or one side is about ½ wavelength in electrical length disposed on a ground plate at an arbitrary interval. A first power feed port and a second power feed port are provided on the first radiation plate and are disposed so that straight lines linking each power feed port position and a middle point of the first radiation plate may be orthogonal to each other. A third power feed port and a fourth power feed port are provided on the second radiation plate and are disposed so that straight lines linking each power feed port position and a middle point of the second radiation plate may be orthogonal to each other. The straight lines are disposed to have an angle of 45 degrees to a straight line linking the first power feed port position and the middle point of the first radiation plate and to a straight line linking the second power feed port position and the middle point of the first radiation plate.

Abstract: A circularly polarized wave antenna is an antenna having two or more electrically conductive elements and a high frequency circuit, wherein at least two of the plurality of electrically conductive elements are constructed in V-shape with an angle of 90 degrees; therefore, it is possible to realize a circularly polarized wave antenna of simple construction having directivity gains in multi-direction.

Abstract: The present invention relates to an antenna equipped in a mobile telecommunication apparatus such as a portable telephone. The object of the invention is to enhance the portability and the durability of the mobile telecommunication apparatus, to provide a mobile telecommunication antenna while is improved in the mass productivity and the electrical characteristics, and to provide a mobile telecommunication apparatus employing the antenna. To achieve the object of the present invention, the mobile communication apparatus has no projecting portion of the antenna provided on a case, and the antenna is accommodated in the case. This enhances both the portability and the durability. Also, the antenna is reduced to a chip size thus improving its mass-productivity and electrical characteristics.

Abstract: An antenna device which includes the first antenna element having one end open and the other end connected to a power feeder, and the second antenna element, having both ends open. The second antenna element is disposed on the outer peripheral surface of the first antenna element in insulated state. The other end of the first antenna element is connected to the power feeder through the first ring-shaped conductor.

Abstract: The present invention relates to an antenna equipped in a mobile telecommunication apparatus such as a portable telephone. The object of the invention is to enhance the portability and the durability of the mobile telecommunication apparatus, to provide a mobile telecommunication antenna while is improved in the mass productivity and the electrical characteristics, and to provide a mobile telecommunication apparatus employing the antenna. To achieve the object of the present invention, the mobile communication apparatus has no projecting portion of the antenna provided on a case, and the antenna is accommodated in the case. This enhances both the portability and the durability. Also, the antenna is reduced to a chip size thus improving its mass-productivity and electrical characteristics.

Abstract: In an antenna unit used for a radio communication device in mobile communications, the object of the present invention is to provide an easily portable antenna unit with low profile but high gain. Furthermore, the structure of the antenna unit can offer easy impedance-matching and maintain a preferable shape for the long term. In the antenna unit of the present invention, an opening is disposed in a part of a conductive material-made ground section made of conductive material. An antenna plate made of conductive material is disposed at the upper surface of the opening, while a ground plate made of conductive material is disposed at the upper section on the rear side of the opening. In addition, a radio frequency circuit is mounted on an area in a ground section other than the opening.

Abstract: A small antenna device having a wide frequency band suitable for being built in mobile communications apparatuses. This antenna device includes a planar radiating element (radiating plate) and a grounding plate provided in parallel to and facing the radiating plate. A feeding line is disposed at approximately the end center of the radiating plate, and supplies high-frequency signals. A shorting portion shorts the radiating plate and grounding plate at near the feeding line. A slit is provided at an end face of the radiating plate approximately opposing the feeding line to form two resonators. A coupling level between two resonators is optimized by adjusting the shape or dimensions of this slit, or loading a reactance element or conductive plate on this slit. Accordingly, a small and short antenna with a preferred characteristic is achieved.

Abstract: In an antenna device of the present invention, circular radiation plate (1) having a diameter of substantially ½ wavelength in electric length faced to ground plate (2) has first power supply port (3) and second power supply port (4) in its periphery. Power supply ports (3) and (4) are disposed at positions where straight lines connecting respective power supply ports to the midpoint of radiation plate (1) intersect at right angles. Four slits (6) axisymmetric with respect the straight lines are disposed in radiation plate (1), and two sides of the periphery of each slit (6) contact with each other.

Abstract: A small antenna has two or more feeding ports. A radiator is made of a planar conductor having a substantially circular shape having the diameter of a substantially half wavelength or a substantially regularly polygonal shape where the length of a diagonal line passes through the center point is the substantially half wavelength. A ground plate is faced to the radiator. On the radiator, the feeding ports are connected to feeding points on two orthogonal line segments passing through the center of the radiator. This antenna is used as not only a single antenna but also two independent antennas having secured isolation between the feeding ports. A small antenna device used as two independent antennas is thus provided. The radiator is formed in a hat shape having an edge, has an Stepped Impedance Resonator (SIR) structure where the diameter of a crest part is a quarter wavelength, and is shortened.

Abstract: A small antenna, which is used in a mobile radio communication apparatus such as a portable telephone, operating in a broader frequency band a conventional antenna, operating corresponding to plural frequencies, and being disposed in a case is provided. The radio communication apparatus including the antenna is also provided. The antenna includes a first conductive radiator having a planer shape, a second conductive radiator having a helical shape, and a planar feeding section that is disposed between the first conductive radiator and the ground plane, is isolated from them, and supplying power by electromagnetic coupling.

Abstract: The present invention relates to an antenna equipped in a mobile telecommunication apparatus such as a portable telephone. The object of the invention is to enhance the portability and the durability of the mobile telecommunication apparatus, to provide a mobile telecommunication antenna while is improved in the mass productivity and the electrical characteristics, and to provide a mobile telecommunication apparatus employing the antenna. To achieve the object of the present invention, the mobile communication apparatus has no projecting portion of the antenna provided on a case, and the antenna is accommodated in the case. This enhances both the portability and the durability. Also, the antenna is reduced to a chip size thus improving its mass-productivity and electrical characteristics.

Abstract: The objective of the present invention is to realize, in an antenna and an electronic equipment using the same, miniaturization of that antenna. To achieve said objective, an antenna electrode (19) is provided on the surface of the main body (18), a grounding electrode (20) is provided on the back face, and a signal electrode (21) is provided on the circumferential face, the antenna electrode (19) being different in length at the X axis from the Y axis. This enables to construct a broad-band antenna with a single piece of antenna, contributing to miniaturization of the antenna.

Abstract: ABSTRACT In an antenna unit used for a radio communication device in mobile communications, the object of the present invention is to provide an easily portable antenna unit with low profile but high gain. Furthermore, the structure of the antenna unit can offer easy impedance-matching and maintain a preferable shape for the long term. In the antenna unit of the present invention, an opening is disposed in a part of a conductive material-made ground section made of conductive material. An antenna plate made of conductive material is disposed at the upper surface of the opening, while a ground plate made of conductive material is disposed at the upper section on the rear side of the opening. In addition, a radio frequency circuit is mounted on an area in a ground section other than the opening.

Abstract: An antenna device of the invention has a configuration in which a first radiation plate and a second radiation plate of which diameter or one side is about ½ wavelength in electrical length are disposed on a ground plate at an arbitrary interval, a first power feed port and a second power feed port provided on the first radiation plate are disposed so that the straight lines linking each power feed port position and the middle point of the first radiation plate may be orthogonal to each other, a third power feed port and a fourth power feed port provided on the second radiation plate are disposed so that the straight lines linking each power feed port position and the middle point of the second radiation plate may be orthogonal to each other, and these straight lines are disposed to have an angle of 45 degrees to a straight line linking the first power feed port position and the middle point of the first radiation plate and to a straight line linking the second power feed port position and the middle p

Abstract: An exhaust gas dilution apparatus 10-2 is the same form multi-venturi type comprising a rectifier 11, divider 12, exhaust chamber 14, dilution tunnel 15, and a divider pipes 13t on the dilution side of a tunnel 15 side. All divider pipes 13 are provided with a venturi 21 having the same performance inserted in the same position, to measure the flow rate in the dilution tunnel and the flow rate on the exhaust pipe side. The opening of the shutter 19 provided in the exit of the exhaust chamber 14 is controlled so that the two flow rates are equivalent.

Abstract: An antenna device which includes the first antenna element having one end open and the other end connected to a power feeder, and the second antenna element. having both ends open. The second antenna element is disposed on the outer peripheral surface of the first antenna element in insulated state. The other end of the first antenna element is connected to the power feeder through the first ring-shaped conductor.

Abstract: The present invention relates to an antenna mainly used in a cellular phone or the like and to a communication terminal using it. It is hence an object thereof to realize an antenna having a high radiation efficiency, a wide adjustable range of the impedance of the antenna, and a capability of matching with an RF circuit by the structure itself without using a matching circuit. The number of structural parameters for adjusting the impedance of the antenna increases. To achieve the object, the antenna in the communication terminal of the present invention has a radiation element wound spirally around an insulating core in the winding direction inverted at an arbitrary position. The antenna is hence capable of adjusting the impedance, and as a result, the number of structural parameters of the antenna increases, and the adjustable range of the impedance of the antenna is expanded.

Abstract: A small antenna device having a wide frequency band suitable for being built in mobile communications apparatuses. This antenna device includes a planar radiating element (radiating plate) and a grounding plate provided in parallel to and facing the radiating plate. A feeding line is disposed at approximately the end center of the radiating plate, and supplies high-frequency signals. A shorting portion shorts the radiating plate and grounding plate at near the feeding line. A slit is provided at an end face of the radiating plate approximately opposing the feeding line to form two resonators. A coupling level between two resonators is optimized by adjusting the shape or dimensions of this slit, or loading a reactance element or conductive plate on this slit. Accordingly, a small and short antenna with a preferred characteristic is achieved.