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21. 发明专利

JPH0927710A HELICAL ANTENNA 失效
公开(公告)号：JPH0927710A
公开(公告)日：1997-01-28
申请号：JP17530895
申请日：1995-07-12
申请人： NEC CORP
发明人： KURAMOTO AKIO , TANABE KOSUKE
IPC分类号： H01Q21/08 , H01Q11/08 , H01Q21/24
摘要： PROBLEM TO BE SOLVED: To obtain an excellent axis ratio and reduce variation in the electric field level of a radiation pattern in a circumferential direction. SOLUTION: A linear coaxial cable 1 and a linear coaxial cable 2 which is shorter than the coaxial cable 1 are arranged adjacently to each other so that their lower ends are aligned. Helical conductors 3 and 4 are wound spirally around only the upper part of the coaxial cable and helical conductors 5 and 6 are wound spirally around the lower part of the coaxial cable 1 and the coaxial cable 2. A straight line A passing the upper start points of the helical conductors 3 and 4 and a straight line B passing the upper start points of the helical conductors 5 and 6 are arranged having an about 90 deg. angle of rotation. Consequently, a circular polarized wave which is extremely excellent in axis ratio is obtained as a radiation pattern obtained by putting radiation electric fields of the helical conductors 3 and 4 and helical conductors 5 and 6 together.

22. 发明专利

JPH0865034A HELICAL ANTENNA 失效
公开(公告)号：JPH0865034A
公开(公告)日：1996-03-08
申请号：JP20061594
申请日：1994-08-25
申请人： NEC CORP
发明人： TANABE KOSUKE , KURAMOTO MASAO
IPC分类号： H01Q1/36 , H01Q1/52 , H01Q11/08
摘要： PURPOSE: To prevent the degradation of the radiation directivity and axial ratio of a helical antenna by using a dielectric substrate for a matching circuit in the helical antenna and preventing the matching circuit and a helical conductor from electrically influencing each other. CONSTITUTION: This antenna is constituted of a coaxial cable 1, the dielectric substrate 10 attached to the tip and two helical conductors 3 and 3'. The upper ends of the two helical conductors 3 and 3' are connected to the dielectric substrate 10, lower ends are opened and arrangement is performed so as not to put the dielectric substrate 10 inside where the helical conductors are wound. The dielectric substrate 10 is constituted of a microstrip line. A coaxial power feeding point is connected to the center conductor of the coaxial cable 1 and the two helical conductors 3 and 3' are connected to a helical power feeding point.

23. 发明专利

JP2001053531A HELICAL ANTENNA AND MANUFACTURE THEREOF 失效
公开(公告)号：JP2001053531A
公开(公告)日：2001-02-23
申请号：JP22625999
申请日：1999-08-10
申请人： NEC CORP
发明人： TANABE KOSUKE
IPC分类号： H01Q1/38 , H01Q1/24 , H01Q5/00 , H01Q11/08 , H01Q23/00
摘要： PROBLEM TO BE SOLVED: To narrow a diameter and then to easily perform assembly in a short time. SOLUTION: An element 100 and a power feeding circuit 210 are connected by a connector, and the connector is composed of a connection pin 310 and the annular ring 300A of plastic resin. A lower part 300B of the annular ring is formed into an outer diameter almost equal to the outside diameter of a dielectric pipe 110 and the upper part 300C of the annular ring 300A is formed into the outside diameter insertable almost without play to the inner side of the dielectric pipe 110. The lower end part of the connection pin 310 is projected downward from the lower surface of the lower part 300B of the annular ring 300A, and the upper end part of the connection pin 310 forms a clearance with the outer peripheral surface of the upper part 300C of the annular ring 300A and is projected upward from the lower part 300B of the annular ring. The annular ring is connected to the dielectric pipe 110 by inserting the upper part 300C to the inner side of the lower end part of the dielectric pipe 110 and clamping the lower end part of the dielectric pipe 110 by the outer peripheral surface of the upper part 300C of the annular ring and the upper end part of the connection pin 310.

24. 发明专利

JPH0878945A HELICAL ANTENNA 失效
公开(公告)号：JPH0878945A
公开(公告)日：1996-03-22
申请号：JP21247794
申请日：1994-09-06
申请人： NEC CORP
发明人： KURAMOTO AKIO , TANABE KOSUKE
IPC分类号： H01Q11/08
摘要： PURPOSE: To improve the durability of a helical pattern and to facilitate electric matching by winding a flexible substrate and a conductor to form the helical pattern around a dielectric cylinder using a pressure sensitive adhesive double coated tape, and short-circuiting respective pattern terminal parts each other through a metal conductor. CONSTITUTION: Two lead wires to form a flexible substrate 7 and a helical pattern 1 are wound around a dielectric cylinder 4 to be a core by a pressure sensitive adhesive double coated tape 3, the terminal parts of the pattern 1 are connected to a U-shaped, etc., metal conductor 6, whose length to pass through the cylinder 4 is variable and impedance can be adjusted, and short- circuited each other, and the helical antenna is formed. Thus, the durability of the helical pattern is improved even in the environment of a wider temperature range in comparison with the case of winding the printed flexible substrate around the dielectric cylinder and fixing it to the projecting part of the dielectric cylinder by the lead wire and the helical antenna easy to adjust electrically can be provided.

25. 发明专利

JPH07202550A HELICAL ANTENNA 失效
公开(公告)号：JPH07202550A
公开(公告)日：1995-08-04
申请号：JP33480893
申请日：1993-12-28
申请人： NEC CORP
发明人： OOMURO MUNEHIKO , KURAMOTO AKIO , TANABE KOSUKE
IPC分类号： H01Q11/08
摘要： PURPOSE:To obtain a high gain in a wide elevation range by increasing or reducing the radius of an antenna by numbers of turns or increasing or reducing the density of lines by numbers of turns. CONSTITUTION:A diameter D of winding of helical conductors 5 and 6 is fixed, and the density of lines of helical conductors is changed by numbers of turns. That is, pitch intervals Lp1, Lp2,... are made longer accrding as going downward from the upper part or the antenna. In this antenna consisting of two helical conductors 5 and 6, the high frequency power supplied from the lower part of the antenna by a coaxial cable is converted from an unbalanced power to a balanced power through a U balun 2, and currents having opposite phases flow to two helical conductors. Currents supplied from the upper end part of the antenna are attenuated while radiating circularly polarized waves in desired directions on the way of flow to the lower end. Consequently, a high circularly polarized wave gain is obtained in a wide range.

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