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1. 发明专利

JP2506514B2 失效
公开(公告)号：JP2506514B2
公开(公告)日：1996-06-12
申请号：JP13469291
申请日：1991-06-06
申请人： YAGI ANTENNA
发明人： TAKAHASHI AKIRA , MORIFUJI MOTOYOSHI
IPC分类号： H01Q11/08 , H01Q13/08 , H01Q21/06 , H01Q21/24

2. 发明专利

JPH06209213A IMAGE TYPE LEAKAGE WAVE NRD GUIDE 失效
公开(公告)号：JPH06209213A
公开(公告)日：1994-07-26
申请号：JP34834792
申请日：1992-12-28
申请人： YAGI ANTENNA , YONEYAMA TSUTOMU , AZUMA TOSHIHIKO
发明人： TAKAHASHI AKIRA , MINASE ATSUSHI , YONEYAMA TSUTOMU , AZUMA TOSHIHIKO
IPC分类号： H01Q1/38 , H01Q13/20
摘要： PURPOSE:To obtain an image type leakage wave NRD guide in which the generation of spurious transmission wave can be prevented even when any right and left structure deformation is applied to the neighborhood of a dielectric strip, and the direction of the radiation of a leakage wave NRD guide can be made in a right and left unidirection. CONSTITUTION:The height and width of a dielectric strip 23 sandwiched between two upper and lower parallel metallic boards 21 and 22 are respectively defined as (a) and (b). Then, lambda is the wave length of a free space, and epsilonr is the specific dielectric constant of the dielectric strip, and a conductive board 24 is provided at one flank of the dielectric strip.

3. 发明专利

JPH06209210A UPPER AND LOWER DISCONTINUITY TYPE LEAKAGE WAVE NRD GUIDE 失效
公开(公告)号：JPH06209210A
公开(公告)日：1994-07-26
申请号：JP34832592
申请日：1992-12-28
申请人： YAGI ANTENNA , YONEYAMA TSUTOMU , AZUMA TOSHIHIKO
发明人： TAKAHASHI AKIRA , MINASE ATSUSHI , YONEYAMA TSUTOMU , AZUMA TOSHIHIKO
IPC分类号： H01Q13/20 , H01Q13/00 , H01Q13/28
摘要： PURPOSE:To obtain an upper and lower discontinuity type leakage wave NRD guide which is simple and short in constitution, and can efficiently radiate radio wave. CONSTITUTION:The two kinds of discontinuous elements 24 and 25 are provided inside a dielectric strip 23 interposed and arranged between two upper and lower parallel metallic boards 21 and 22 or the metallic boards 21 and 22. A dielectric having a higher dielectric constant than that of the dielectric strip 23 is added to one discontinuous element 24, and the dielectric having the lower dielectric constant than that of the dielectric strip 23 is added to the other discontinuous element 25.

4. 发明专利

JPH0557547B2 失效
公开(公告)号：JPH0557547B2
公开(公告)日：1993-08-24
申请号：JP4261983
申请日：1983-03-14
申请人： HITACHI KIDEN KOGYO KK , YAGI ANTENNA , TSUMURA TOSHIHIRO
发明人： TSUMURA TOSHIHIRO , KAMEI SHIGEKI , WARATANI HIROHARU , TAKAHASHI AKIRA
IPC分类号： G01S1/70 , G01S3/786 , G05D1/02 , H01H35/00

5. 发明专利

JPH05121921A PORTABLE SMALL RADIO EQUIPMENT 失效
公开(公告)号：JPH05121921A
公开(公告)日：1993-05-18
申请号：JP27771091
申请日：1991-10-24
申请人： YAGI ANTENNA , MIKKAICHI MASASHI
发明人： TAKAHASHI AKIRA , MIKKAICHI MASASHI
IPC分类号： H01Q1/24 , H01Q1/48 , H04B1/38
摘要： PURPOSE:To attain a stable transmission/reception operation by obtaining an excellent antenna efficiency even when one side of a radio equipment casing is shorter, e.g. than (lambda/4) in a portable small radio equipment whose casing is used as the earth of an antenna. CONSTITUTION:A metallic casing 11 used as the earth of an antenna 14 while forming the outer shape of the radio equipment main body is coated by using a ferrodielectric body 15 whose dielectric constant is at least >=3 so that the wavelength is reduced in an earth current flowing to the metallic case 11.

6. 发明专利

JPH04345304A PLANAR ANTENNA 失效
公开(公告)号：JPH04345304A
公开(公告)日：1992-12-01
申请号：JP11865991
申请日：1991-05-23
申请人： YAGI ANTENNA , NAKANO HISAMATSU
发明人： TAKAHASHI AKIRA , MORIFUJI MOTOYOSHI , NAKANO HISAMATSU
IPC分类号： H01Q21/06 , H01Q21/24
摘要： PURPOSE:To improve the radiation efficiency without generating of an undesired mode in the planar antenna employing a tri-plate type feed system. CONSTITUTION:Plural rectangular notches 18a-18g whose one end is left to an upper metallic plate 11 with radiation elements 12a, 12b, 13a, 13b of a slot twin spiral antenna formed thereon are formed and rectangular pieces 19a-19g cut off corresponding to the rectangular notches 18a-18g are folded perpendicularly in the direction of a lower metallic plate 14 by using the one-end leaving part as a base and the rectangular pieces 19a-19g are used to short-circuit electrically the upper metallic plate 11 and the lower metallic plate 14.

7. 发明专利

JPH04154307A PLANE ANTENNA 失效
公开(公告)号：JPH04154307A
公开(公告)日：1992-05-27
申请号：JP28019090
申请日：1990-10-18
申请人： YAGI ANTENNA
发明人： TAKAHASHI AKIRA , MORIFUJI MOTOYOSHI
IPC分类号： H01Q21/24 , H01Q11/08 , H01Q23/00
摘要： PURPOSE:To facilitate the assembly and to reduce the manufacturing and work cost by manufacturing a supporter for a dielectric in accordance with each of antenna elements, mounting and superposing the dielectric and a conductor plate, and thereafter, providing erectly only each antenna element. CONSTITUTION:On the surface of a metallic case 21, a dielectric 22 whose diameter is almost the same as that of the metallic case 21 is mounted. On the surface of the dielectric 22, cylindrical projecting parts 23,... for supporting an element are formed at an interval set in advance, respectively. When many helical antenna elements 26,... are provided erectly in a floating state against the surface of a conductor plate 24, a dielectric 28 is mounted against its conductor plate 24. In the center part of the metallic case 21, a feed hole 31 is formed, and on its lower face side, a converter 32 is provided, a feed pin 32a of the converter 32 is inserted into the lower face center part of the dielectric 22 and a receiving signal is led out. The receiving signal subjected to frequency conversion through the converter 32 is supplied to a receiver through a cable 33. In such a way, it does not take time for the manufacturing and assembling work, and the cost can be reduced.

8. 发明专利

JPH0410702A ANTENNA COIL 失效
公开(公告)号：JPH0410702A
公开(公告)日：1992-01-14
申请号：JP11055490
申请日：1990-04-27
申请人： YAGI ANTENNA
发明人： MORIFUJI MOTOYOSHI , TAKAHASHI AKIRA
IPC分类号： H01Q1/36 , H01Q1/52 , H01Q11/08
摘要： PURPOSE:To prevent the characteristics of an antenna coil from being deteriorated due to a secular change by fixing a spiral coil whose one end is open to a bobbin molded with a resin material, linearly stretching linearly the other end of the coil from the lower end of a projection part formed on the center part of the lower side of the bobbin and divided in the peripheral direction at its head, and inserting the projection part into a waveguide to insert and fix the other end of the coil. CONSTITUTION:The spiral coil 101 whose one end is opened is fixed to the bobbin 104 molded with a resin material such as polyethylene, the other end of the coil 101 is linearly stretched out from the lower end of the projection part 108 formed on the center part of the lower side of the bobbin 104 and divided in the peripheral direction at its head and the projection part 108 is inserted into the waveguide 202 to insert and fix the other end of the coil 101 into/on the waveguide 202 and obtain the electromagnetic coupling of both the elements. For instance, the coil 101 is pressed and fixed into/on a leading groove 105 whose inside is slightly narrower than the diameter of the coil 101 and the antenna coil is inserted and fixed into a hole 201 formed on the upper face 202a of the waveguide 202 by utilizing the projection part 108 formed on the lower face of the bobbin 104. Consequently, no secular change is generated in respective sizes of respective parts of the antenna and the electric characteristics can be prevented from being deteriorated.

9. 发明专利

JPH0214693A PICTURE COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH0214693A
公开(公告)日：1990-01-18
申请号：JP16393388
申请日：1988-06-30
申请人： YAGI ANTENNA
发明人： TAKAHASHI AKIRA , SAITOU SENROU
IPC分类号： H04N7/173
摘要： PURPOSE:To make the transmission of lots of picture signals efficient by not fixing a frequency corresponding to the picture signal for both incoming and outgoing bands of a CATV network and applying variable control so as to utilize a limited frequency band effectively. CONSTITUTION:An analog picture signal from plural cameras, VTR, laser disk players or the like in a 2-way CATV network 7 is converted into a desired frequency signal in the incoming band by using a control signal and sent to a head end 1. Then the head end 1 distributes it and converts it into a desired frequency signal of each outgoing band via frequency converters 34, 35,... and then synthesized and connected to the CATV network 7. Thus, the picture transmission of the moving picture in the 2-way CATV network 7 is attained and the connection with other LAN and the AV network by dynamic channel exchange are attained.

10. 发明专利

JPH01236703A MICROWAVE ANTENNA SYSTEM 失效
公开(公告)号：JPH01236703A
公开(公告)日：1989-09-21
申请号：JP6227788
申请日：1988-03-16
申请人： YAGI ANTENNA
发明人： TAKAHASHI AKIRA , KATO SEIJI
IPC分类号： H01Q19/22 , H01Q7/00 , H01Q9/44 , H01Q21/24
摘要： PURPOSE:To obtain a wide band characteristic with a miniaturized system by connecting the plate of coaxial cables to respective feeding elements of a linear antenna and connecting the other ends of coaxial cables to a frequency converter. CONSTITUTION:Outer conductors of coaxial cables 14 are fixed to a metallic plate 13, and a dielectric substrate 11 on which a linear antenna 12 is worked and formed is arranged above the metallic plate 13. The plate 13 of coaxial cables 14 is connected to respective feeding elements 12a-12d of the linear antenna 12, and the other ends of coaxial cables 14 are connected to a frequency converter 15.

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