-
公开(公告)号：DE69816701T2
公开(公告)日：2004-04-15
申请号：DE69816701
申请日：1998-05-05
Applicant: NEC CORP
Inventor： KURAMOTO AKIO , TANABE KOSUKE
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.
-
公开(公告)号：AU745994B2
公开(公告)日：2002-04-11
申请号：AU5841098
申请日：1998-03-13
Applicant: NEC CORP
Inventor： KURAMOTO AKIO
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.
-
公开(公告)号：CA2236963C
公开(公告)日：2001-05-01
申请号：CA2236963
申请日：1998-05-07
Applicant: NEC CORP
Inventor： KURAMOTO AKIO , TANABE KOSUKE
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.
-
公开(公告)号：CA2232064C
公开(公告)日：2001-05-01
申请号：CA2232064
申请日：1998-03-13
Applicant: NEC CORP
Inventor： KURAMOTO AKIO
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.
-
公开(公告)号：AU1176800A
公开(公告)日：2000-06-05
申请号：AU1176800
申请日：1999-11-10
Applicant: NEC CORP
Inventor： KURAMOTO AKIO
IPC: H01Q15/14 , H01Q1/08 , H01Q1/12 , H01Q1/24 , H01Q1/36 , H01Q11/08 , H01Q19/10 , H04M1/02 , H04Q7/32
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.
-
Patent Agency Ranking
公开(公告)号：AU5841098A
公开(公告)日：1998-09-17
申请号：AU5841098
申请日：1998-03-13
Applicant: NEC CORP
Inventor： KURAMOTO AKIO
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.
-
公开(公告)号：AU2372097A
公开(公告)日：1997-12-04
申请号：AU2372097
申请日：1997-05-30
Applicant: NEC CORP
Inventor： KURAMOTO AKIO , TANABE KOSUKE
Abstract: A lens antenna is disclosed which comprises a conical horn and a lens attached to an aperture of the horn. The lens has a first planar surface at a first side which faces free space and a hyperboloid of revolution at a second side opposite the first side and is made of a dielectric material with relative permittivity ranging from 2 to 4. The lens is provided with a cylindrical portion which has a second planar surface parallel to the first planar surface and displaced from the first planar surface by a predetermined distance. The cylindrical portion being concentric with the lens.
-
公开(公告)号：NO972453L
公开(公告)日：1997-12-01
申请号：NO972453
申请日：1997-05-29
Applicant: NEC CORP
Inventor： KURAMOTO AKIO , TANABE KOSUKE
Abstract: A lens antenna is disclosed which comprises a conical horn and a lens attached to an aperture of the horn. The lens has a first planar surface at a first side which faces free space and a hyperboloid of revolution at a second side opposite the first side and is made of a dielectric material with relative permittivity ranging from 2 to 4. The lens is provided with a cylindrical portion which has a second planar surface parallel to the first planar surface and displaced from the first planar surface by a predetermined distance. The cylindrical portion being concentric with the lens.
-
公开(公告)号：NO972453A
公开(公告)日：1997-12-01
申请号：NO972453
申请日：1997-05-29
Applicant: NEC CORP
Inventor： KURAMOTO AKIO , TANABE KOSUKE
-
公开(公告)号：CA1298402C
公开(公告)日：1992-03-31
申请号：CA568066
申请日：1988-05-30
Applicant: NEC CORP
Inventor： YAMANE TOSHINOBU , KURAMOTO AKIO , SHIMIZU RYUJI , NAKAYAMA MAKOTO
Abstract: In a tracking system of a stationary satellite, a phased array is used for an antenna mounted on an automobile. The phased array antenna has a sharp beam which is switched between two different directions in azimuth. The antenna beam is switched between the two directions periodically by control of phase constants in a feeding circuit of the antenna and comparison is made in strength between signals received before and after the beam switching to obtain an error signal as an azimuth error signal. Then, the antenna is mechanically moved in azimuth according to the azimuth error signal until the azimuth error signal becomes zero. In a case the antenna beam is also switched between two directions in elevation, the antenna beam is switched in elevation during an interval between successive two times of the beam switching operation in azimuth and detects a difference in strength of signals received before and after the switching in elevation to thereby produce the difference as an elevation error signal. The antenna is mechanically moved in elevation according to the elevation error signal until the elevation error signal becomes zero.
-
-
-
-
-
-
-
-
-
Search Results
146
records
(took 0.025 seconds)
