Anritsu Corporation

Masaaki Fuse

Hitoshi Sekiya

Takashi Kawamura

Akihito Otani

Takao Tanimoto

Hideyuki Sakamoto

Ken Shioiri

Hanako Noda

A material property inspection apparatus includes a conveyance unit, a light source, an irradiation unit, a light receiving unit, a signal detection unit, a material property value input unit, an inspection set value input unit, and a processing unit. The processing unit calculates a relation equation between the material property value from the material property values of the plurality of test pieces and the light intensity of the transmitted light or the reflected light of respective test pieces, calculates the material property value of the inspected object from the light intensity of the transmitted light or the reflected light detected by the signal detection unit and the relation equation, compares the calculated material property value of the inspected object with the inspection set value inputted from the inspection set value input unit, and determines the quality of the inspected object.

Material property inspection apparatus

A near-field measurement system includes a measurement probethat receives a radio signal that is transmitted from an antenna under measurementat a plurality of measurement positions included in a predetermined scan range, a frequency converterthat frequency-converts a frequency of the radio signal to a desired frequency, a timing processing unitthat generates a timing signal for starting measurement of an amplitude and a phase of the radio signal from a trigger signal output from a transmission devicein synchronization with transmission of the radio signal, and an amplitude and phase calculation unitthat acquires a radio signal frequency-converted by a frequency converterand digitized by an A/D converteron the basis of a timing signal for each measurement position and calculates an amplitude and a phase in a near field of the acquired radio signal.

Near-field measurement system and near-field measurement method

To provide a calibration system and a calibration method capable of measuring the amplitude and the phase of the radio signal on the electromagnetic radiation surface of the measured antenna, even in the case where the interval between antenna elements is narrow. The calibration systemincludes: an antenna control unitthat selects and excites a combination of antenna elements from among a plurality of antenna elements provided in the measured antennaand thereafter selects and excites another combination of antenna elements; and a probe antennathat receives an electromagnetic wave of the radio signal transmitted from the combination of the antenna elements at a plurality of measurement positions set within a predetermined measurement plane P of the near field area of the measured antenna, each time a combination of the antenna elements selected by the antenna control unitare switched.

Calibration systems and calibration method

An input signal Sx in a first millimeter-wave frequency band higher than 100 GHz is input to a millimeter-wave band filterin which a pair of radio wave half mirrorsA andB so as to opposite to each other and which performs a resonance operation. A signal component Sa corresponding to the resonance frequency of the filter is extracted, is mixed with a first local signal Lwith a fixed frequency, and is converted into a signal in a second frequency band. The converted signal component Sb is mixed with a second local signal Lwhose frequency is swept and is converted into a signal in a predetermined intermediate frequency band. Then, the level of the signal is detected. The millimeter-wave filterhas high selectivity characteristics in a frequency domain higher than 100 GHz and can change its passband center frequency.

Millimeter-wave band spectrum analysis device and analysis method

In a frequency converting system, an input signal x(t) is supplied to a signal branching section for dividing a predetermined frequency domain into M bands, extracting signal components of the respective divided bands. The respective signal components and local signals each including a frequency difference corresponding to a predetermined intermediate frequency with respect to a center frequency of each band are input to a frequency converting part. The signals of the respective divided bands are converted into signals of intermediate frequency bands each including the predetermined intermediate frequency as the center frequency, the conversion outputs are sampled by using a common clock signal, whereby the conversion outputs are converted into digital signals. Further, after being subjected to phase correction processing, the digital signals are subjected to frequency conversion and combination processing by a signal regeneration part.

Frequency converting system

A time-interleaved analog-to-digital converter stores in a correction information memory, correction information required to correct an error between signals output by a plurality of N analog-to-digital converters in advance. At this time, in order to enable acquisition of data required for a correction processing within a short period of time, a signal generator causes the plurality of N analog-to-digital converter to input a calibration signal including a plurality of signal components, each of which is positioned at a desired frequency in a bandwidth in which N/2 times of a sampling frequency Fs is defined as an upper limit, the signal components appearing in a bandwidth in which half times of the sampling clock frequency Fs is defined as an upper limit by sampling the analog-to-digital converters. A correction information calculating unit carries out a spectrum analysis relevant to analog-to-digital converted signals output by the plurality of N analog-to-digital converters in response to the calibration signal, thereby obtaining an amplitude and a phase of a plurality of signal components, newly obtaining the correction information, based on the amplitude and phase, and updating contents of the correction information memory in accordance with newly obtained correction information.

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Kanagawa, Japan

Masaaki Fuse