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公开(公告)号：JPH04122861A
公开(公告)日：1992-04-23
申请号：JP24505890
申请日：1990-09-14
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI , NAKADA JUICHI
Abstract: PURPOSE:To measure and correct the shift angle of the orthogonality in the detection of a vector and to enhance measuring stability by increasing the number of bits of the output of a phase accumulator and making a phase variable with high accuracy and high dissolving power using a sign memory having a relatively narrow address space or a D/A converter of relatively low resolving power. CONSTITUTION:A phase accumulator (PA) 43 accumulates and adds l-bit output at every clock of a clock generator 12. The l-bit output of the PA 43 is added to l-bit offset data P by an adder 44 and the host k-bit in this output is supplied to a sign memory 14 as an address. The host k-bit in the l-bit output of the PA 43 passes through sign memories 25, 26 as an address to be supplied to latch circuits 28, 31 as a latch command. The output of a multiplier 38 is multiplied by sin theta by a multiplier 45 and the multiplying output thereof is added to the output of a multipler 39 by an adder 46 and 1/cos theta is multiplied by a multiplier 47 and the output thereof becomes imaginary output IM. The multipliers 45, 47 and the adder 46 constitute a correction operation part 48 and the shift of orthogonality or the non-coincidence of the constants of D/A converters 32, 33 is calibrated.
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公开(公告)号：JPS6310469B2
公开(公告)日：1988-03-07
申请号：JP22446582
申请日：1982-12-20
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
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公开(公告)号：JPS5955523A
公开(公告)日：1984-03-30
申请号：JP16737082
申请日：1982-09-24
Applicant: Advantest Corp
Inventor： KITAYOSHI HITOSHI
CPC classification number: G01R23/16
Abstract: PURPOSE: To obtain a generator of such a signal that can assure the highest accuracy of analysis of a high-speed Fourier conversion analyzer, by providing a clock generating means, etc. which generates a clock signal which is synchronous with an external clock.
CONSTITUTION: A clock generating means generates a clock signal which is synchronous with an external clock. For instance, an external clock is supplied through a terminal 21 and then converted into a high frequency clock by a frequency converter 22. Then a frequency divider 23 divides the frequency in response to the set value of a frequency converter 22. For the output of the divider 23, the frequency is divided by a frequency divider 25 in response to the set value of a zoom coefficient setting part 26. Then the output of the divider 23 is supplied to an address counter 28 via a changeover switch 27. A waveform memory 29 reads out a waveform as the digital value in response to the set value of a selector 31, and this output is latched by a latching circuit 32 synchronously with the output of the divider 25. This latched output is converted into an analog signal by a D/A converting circuit 33.
COPYRIGHT: (C)1984,JPO&JapioAbstract translation: 目的：通过提供产生与外部时钟同步的时钟信号的时钟发生装置等，获得能够确保高速傅里叶转换分析器的最高分析精度的信号发生器。 构成：时钟发生装置产生与外部时钟同步的时钟信号。 例如，通过端子21提供外部时钟，然后由变频器22将其转换成高频时钟。然后，分频器23根据变频器22的设定值对频率进行分频。为了输出 分频器23根据变焦系数设定部26的设定值将频率除以分频器25.然后，分频器23的输出经由切换开关27提供给地址计数器28.波形存储器 29根据选择器31的设定值读出波形作为数字值，并且该输出与锁存电路32同步地与分频器25的输出锁存。该锁存的输出由一个 D / A转换电路33。
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公开(公告)号：JP2002064440A
公开(公告)日：2002-02-28
申请号：JP2000250028
申请日：2000-08-21
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a method and apparatus for monitoring a radio waves, which is capable of improving the efficiency of radio wave monitoring by reducing time for preparing a database by a radio wave propagation simulation. SOLUTION: The patterns of the arrival direction and strength of a radio wave are observed by a sensor station 12a. The observation result by the sensor station 12a is compared with the simulation result of the patterns of the arrival directions and strength of radio waves which are observed at a plurality of other points when the radio waves are emitted from the sensor station 12a. Of the plurality of the observation points, the point which gives the pattern of the arrival direction and strength of a radio wave having the highest correlation with the observation result by the sensor station 12a is determined as an objective radio wave emission source.
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公开(公告)号：JP2001311756A
公开(公告)日：2001-11-09
申请号：JP2000129802
申请日：2000-04-28
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a field distribution measuring method and a measuring device measuring the spatial distribution of the electric field or magnetic field by continuously scanning a probe and capable of removing the measurement noise caused by the drift of the travel position of the probe and measuring timing. SOLUTION: The spatial distribution of the electric field or magnetic field is measured at a plurality of sampling points while continuously scanning the probe by this field distribution measuring method. The drift quantity of sampling is calculated based on the spurious spectrum generated by the drift of the position of the probe and the measuring timing, and the distribution of the electric field or magnetic field is measured in consideration of this drift quantity.
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Patent Agency Ranking
公开(公告)号：JP2000307329A
公开(公告)日：2000-11-02
申请号：JP11033499
申请日：1999-04-19
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: PROBLEM TO BE SOLVED: To mass-produce dipole antennas with high dimensional accuracy. SOLUTION: A thin and long cylindrical feed section 21, antenna sections 22, 23, whose length is 1/4 an operating wavelength λ, that are extended from one end of the thin and long cylindrical feed section 21 opposite to each other toward both sides and a reflecting plate section 24 that is parted from the antenna sections 22, 23 by an interval of λ/4, at the center of which the thin and long cylindrical feed section 21 is placed, are integrally configured as a synthetic resin material mold product, and a metallic plating layer is formed to the entire mold product. However, the plated layer is removed at an end face of the feeding section 21 around a through-hole in a circular-arc shaped (44). Then slits 32, 33 about λ/4 in length are formed from an end face of the plating layer of the circumferential face of the feeding section 21 between the antenna sections 22, 23 toward the reflecting plate section 24 to configure a coaxial slit balun and the plated layer on the antenna sections 22, 23 configures antenna elements 25, 26.
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公开(公告)号：JPH1165406A
公开(公告)日：1999-03-05
申请号：JP22660197
申请日：1997-08-22
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: PROBLEM TO BE SOLVED: To eliminate a dead angle, to realize a 360 deg. visual field angle and to evaluate the propagation of radio waves and sound waves at a real time by using a fixed sensor and a scanning sensor, which conducts a circumferential scanning and obtaining the interference of the signals received by both of the sensors while moving the scanning sensor. SOLUTION: A radiated wave motion is made to a first received signal by receiving the radiated wave motion with a first sensor while the first sensor is scanned on the circumference. A radiated wave motion is made to a second received signal by receiving the radiated wave motion with a second sensor located at a position without changing to the center of the circumference. Then, the both received signals are interferred with each other to obtain interferred signals and the interferred signals are detected to obtain the measured data at each point. That is, as represented by the expression, a point on the circumference is represented by a rotational angle ϕ, the radius of the circle is called r, the imaginary unit is represented by j, the circular constant is called π, the rotational angle of the center position is called ϕ', the wavelength of the radiated wave motion is called λ, the incident angle of the radiated wave motion is called θ and a weighting function is called W(ϕ). Based on the measured data E2 (r, ϕ) at each point, an evaluation function V(ϕ') is calculated and a bearing ϕ' of the radiated wave motion is estimated.
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公开(公告)号：JPH10232253A
公开(公告)日：1998-09-02
申请号：JP3616697
申请日：1997-02-20
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: PROBLEM TO BE SOLVED: To estimate the three-dimensional directivity of the basic station antenna in mobile communication, for example, accurately under operating state even in an urban environment where buildings are arranged intricately. SOLUTION: An observation point is located at a position where a primary wave source, i.e., an antenna to be measured, can be observed. The direct wave from the primary wave source and the reflected wave are then received and the three-dimensional coordinates and the intensity are determined for the primary wave source and a mirror image wave source corresponding to the reflected wave by two frequency hologram observation (Step 101). Subsequently, the azimuth and the incident angle of reflection point corresponding to the mirror image wave source viewed from the primary wave source are determined for each mirror image wave source (Step 102). Finally, a reflection coefficient is determined from the incident angle at that reflection point, and the like, for each reflection point and the intensity of mirror image wave source is multiplied by the reciprocal of the reflection coefficient thus determining the antenna directivity in the direction of that reflection point for the primary wave source.
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公开(公告)号：JPH09153725A
公开(公告)日：1997-06-10
申请号：JP31231195
申请日：1995-11-30
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a miniaturized and lightened linear polarizing probe antenna which can be used for exactly measuring spatial electromagnetic field distribution on microwave frequency band and improves polarization selectivity. SOLUTION: When a central use wavelength is defined as λ, a coaxial cable 12 is passed through a reflector 11 so that the top end of coaxial cable 12 can be protruded just for λ/4 and at this through part, the external conductor of coaxial cable 12 is electrically connected with the reflector 11. At the protruded part, a slit part 74 is provided and the external conductor is divided into two parts of external conductor elements 12a and 12b. The root of one element 13a of dipole antenna 13 is connected with the top end of one external conductor element 12a and a central conductor 12c of coaxial cable and another element 13b is connected to the top end of the other external conductor element 12b so that balancing can be constituted by one external conductor element 12a. In this case, it is not necessary to provide the reflector 11.
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公开(公告)号：JPH07210073A
公开(公告)日：1995-08-11
申请号：JP410794
申请日：1994-01-19
Applicant: ADVANTEST CORP
Inventor： KITAYOSHI HITOSHI
Abstract: PURPOSE:To decrease the quantity of hologram reproducing arithmetic. CONSTITUTION:The high-frequency signal from an oscillator 21 is modulated with pulses from a pulse generator 23 and radiated from an antenna 12, its reflected wave is received at respective points (x, y) on an observation surface 13, and reception outputs are processed by the orthogonal detection of a detector 25 by using the output of an oscillation receiver 21; and the detection output is sampled by AD converters 32 and 33 with the output generated by delaying the pulses of the pulse generators 23 by td, the outputs of the both are processed for hologram reproduction, and the arithmetic result I(u, v) and td are displayed on a three-dimensional display unit 16.
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