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公开(公告)号：DE602004020856D1
公开(公告)日：2009-06-10
申请号：DE602004020856
申请日：2004-12-09
Applicant: NEC CORP
Inventor： FUKUDA JUNICHI
IPC: H01Q9/04 , H01Q23/00 , H01Q1/24 , H01Q1/38 , H01Q7/00 , H01Q9/30 , H03H7/38 , H04B7/08 , H04M1/00 , H04M1/725
Abstract: An electrical signal is fed from one end of an antenna element, and the other end thereof is terminated by a variable reactance circuit. A reactance value of the variable reactance circuit is changed according to use state of a device to optimally set its directivity. Matching conditions at an electricity feeding point are controlled to match an impedance of the electricity feeding point which fluctuates according to the value of the variable reactance circuit. With the above construction, there are provided an antenna device that is downsized, can control its directivity, and does not deteriorate a communication quality depending on a use state, and a radio communication apparatus provided with the antenna device.
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公开(公告)号：EP2975692A4
公开(公告)日：2016-11-02
申请号：EP14764220
申请日：2014-03-13
Applicant: NEC CORP
Inventor： FUKUDA JUNICHI
Abstract: An antenna device capable of keeping a high reception level even in a circumstance where a vibration is imparted to the antenna device is provided. An antenna unit part is coupled to a housing unit (210) in such a way that the antenna unit part can be relatively oscillated. Acceleration sensors (231-234) that detect accelerations that occur in an azimuth angle direction and an elevation angle direction are provided in the housing unit (210). Linear actuators (251A, 252A) are provided between the housing unit (210) and an antenna unit part (220) so that the linear actuators are able to adjust a relative angle of the antenna unit part (220) with respect to the housing unit (210). A variation amount calculation unit (312) calculates a variation amount in the elevation angle direction and the azimuth angle direction based on the accelerations detected by the acceleration sensors (231-234). A correction amount calculation unit (313) calculates a correction amount to cancel the variation amount calculated by the variation amount calculation unit (312). The linear actuators (251A, 252A) are driven based on the correction amount.
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3.发明公开PLANAR ANTENNA, AND COMMUNICATION DEVICE AND CARD-TYPE TERMINAL USING THE ANTENNA 审中-公开平面天线和通信设备和终端提供天线卡类型
公开(公告)号：EP2120288A4
公开(公告)日：2014-03-05
申请号：EP08721774
申请日：2008-03-11
Applicant: NEC CORP
Inventor： KURAMOTO AKIO , FUKUDA JUNICHI
CPC classification number: H01Q9/285 , H01Q1/2208 , H01Q1/38 , H01Q1/48 , H01Q9/40
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4.发明公开ARRAY ANTENNA, RADIO COMMUNICATION APPARATUS, AND ARRAY ANTENNA CONTROL METHOD 审中-公开振子天线，无线电通信设备及集团天线控制方法
公开(公告)号：EP2117075A4
公开(公告)日：2011-04-20
申请号：EP07850410
申请日：2007-12-11
Applicant: NEC CORP
Inventor： FUKUDA JUNICHI
CPC classification number: H01Q9/0421 , H01Q3/446 , H01Q9/42 , H01Q21/28 , H04B7/0689 , H04B7/0871
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公开(公告)号：EP2472670A4
公开(公告)日：2014-06-18
申请号：EP10811772
申请日：2010-08-20
Applicant: NEC CORP
Inventor： FUKUDA JUNICHI
CPC classification number: H01Q21/08 , H01Q9/0407 , H01Q21/065
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Patent Agency Ranking
公开(公告)号：JP2011142504A
公开(公告)日：2011-07-21
申请号：JP2010001985
申请日：2010-01-07
Inventor： KURAMOTO AKIO , IWANAKA DAISUKE , FUKUDA JUNICHI
Abstract: PROBLEM TO BE SOLVED: To provide a parabolic antenna excellent in radio wave absorption characteristics and durability even at a reduced cost. SOLUTION: In the parabolic antenna 1 including a reflector 2, a shroud 3 and a primary radiator 4, a plurality of plate-like radio wave absorbers 10 made of a wood piece are arranged side by side on the inner peripheral surface of the shroud 3. Also, by adjusting the shape and thickness of the radio wave absorbers 10, the radio wave absorption characteristics are improved, and side lobe characteristics are improved. Further, by securing the interval D1 of the radio wave absorbers 10, the reflection characteristics of the oblique incidence of radio waves are improved. COPYRIGHT: (C)2011,JPO&INPIT
Abstract translation: 要解决的问题：即使以降低的成本，也提供具有优异的无线电波吸收特性和耐久性的抛物面天线。 解决方案：在包括反射器2，护罩3和初级辐射器4的抛物面天线1中，由木片制成的多个板状无线电波吸收器10并排地布置在 另外，通过调整无线电波吸收体10的形状和厚度，提高了电波吸收特性，提高了旁瓣特性。 此外，通过确保无线电波吸收体10的间隔D1，提高了无线电波的倾斜入射的反射特性。 版权所有（C）2011，JPO＆INPIT
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公开(公告)号：JP2005175902A
公开(公告)日：2005-06-30
申请号：JP2003413219
申请日：2003-12-11
Inventor： FUKUDA JUNICHI
IPC: H01Q23/00 , H01Q1/24 , H01Q1/38 , H01Q7/00 , H01Q9/04 , H01Q9/30 , H03H7/38 , H04B7/08 , H04M1/00 , H04M1/725
Abstract: PROBLEM TO BE SOLVED: To provide a small-sized antenna device controlling directivity without lowering a communication performance by a using state or a posture, and also to provide radio communication equipment provided with it.
SOLUTION: Power is fed from one of the terminals of an antenna element and the other terminal is terminated at a variable reactance circuit. The reactance value of the variable reactance circuit is changed corresponding to the using condition and the posture of the device and thus the directivity is optimally set. Also, matching conditions at a feeding point are controlled and the impedance of the feeding point varied by the value of the variable reactance circuit is matched.
COPYRIGHT: (C)2005,JPO&NCIPIAbstract translation: 要解决的问题：提供一种控制方向性的小型天线装置，而不会降低通过使用状态或姿势的通信性能，并且还提供设置有它的无线电通信设备。
解决方案：从天线元件的一个端子馈送电力，另一个端子终止于可变电抗电路。 可变电抗电路的电抗值根据使用条件和设备的姿势而改变，因此方向性被最佳设定。 此外，控制馈电点的匹配条件，并且馈电点的阻抗随可变电抗电路的值而变化。 版权所有（C）2005，JPO＆NCIPI
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公开(公告)号：JP2005051572A
公开(公告)日：2005-02-24
申请号：JP2003282231
申请日：2003-07-30
Inventor： FUKUDA JUNICHI
CPC classification number: H01Q25/00 , H01Q3/24 , H01Q21/061 , H01Q21/22
Abstract: PROBLEM TO BE SOLVED: To obtain an antenna assembly which copes with use of a plurality of frequencies or a plurality of communication systems by a single antenna and allows the directivity to be controlled to improve the communication performance.
SOLUTION: A constitution allowing an antenna shape to be freely changed is given to not only vary the directivity but also cope with an arbitrary frequency band. That is, a plurality of antenna elements 1 are arranged, and switches 2 switching to connection/non-connection states between these elements are provided between adjacent elements, and a dipole shape bent at 90° is given by varying the antenna shape by control of these switches to obtain the directivity, and the length of the dipole shape is controlled to allow switching of the frequency band. Furthermore, a reflector 20 having a shape similar to the dipole antenna 10 is formed to improve the directivity.
COPYRIGHT: (C)2005,JPO&NCIPIAbstract translation: 要解决的问题：为了获得通过单个天线来应对使用多个频率或多个通信系统的天线组件，并且允许控制方向性以改善通信性能。 解决方案：给予天线形状可自由改变的构造不仅改变方向性，而且还应付任意频带。 也就是说，布置多个天线元件1，并且在相邻元件之间设置切换到这些元件之间的连接/非连接状态的开关2，并且通过控制天线形状来改变天线形状来给出90°弯曲的偶极子形状 这些开关以获得方向性，并且控制偶极子形状的长度以允许频带的切换。 此外，形成具有类似于偶极天线10的形状的反射器20，以提高方向性。 版权所有（C）2005，JPO＆NCIPI
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公开(公告)号：JP2000306346A
公开(公告)日：2000-11-02
申请号：JP11277999
申请日：1999-04-20
Applicant: NEC CORP
Inventor： FUKUDA JUNICHI
Abstract: PROBLEM TO BE SOLVED: To reduce the generation of a seek error due to the influence of a defect existing in a substituted track by substituting a cylinder, which cannot be positioned, for a defect track, retreating a defect sector on the basis of information on a defect position, and performing a seek operation. SOLUTION: When a defect exists in a track (n+4), the track (n+4) is regarded as unusable so as to be replaced with another track, and it is possible to prevent that a track cannot be positioned. When a track B is taken while a part between adjacent tracks is seeked, a seek operation is started after a write operation to a track (n+3) is finished. At this time, a seek starting position is deviated while the track (n+4) passes a defect area, and, e.g. a track C is taken. Thereby, it is possible to prevent a seek error which is generated when the track (n+4) passes the defect area. In addition, even in the starting sector of a track (n+5), the seek starting position is deviated in advance.
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公开(公告)号：JPH09147311A
公开(公告)日：1997-06-06
申请号：JP30281895
申请日：1995-11-21
Applicant: NEC CORP
Inventor： FUKUDA JUNICHI
IPC: G11B5/09
Abstract: PROBLEM TO BE SOLVED: To improve a transient response between writing and reading in a magnetic disk device. SOLUTION: A reproducing signal 1-1 read from a magnetic head 1 is amplified by a preamplifier 2 and inputted to an AGC circuit 3. The AGC circuit 3 amplifies an inputted reproduced signal 102 into a certain amplitude and outputs this signal to a demodulation circuit 4. The demodulation circuit 4 demodulates the reproduced signal to original data and outputs a demodulated signal 104. The AGC circuit 3 holds an AGC gain, switches input impedance and switches the operating speed of the AGC based on inputted control signals A107 and B108. An AGC control circuit 5 counts an reference clock signal 106 when a write gate signal 105 is active. Thus, a timing for controlling the AGC circuit 3 is changed depending on the time of writing. Especially, when the time of writing changes because of the difference of a format, a control signal is generated with a timing for making the circuit optimal.
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