Abstract: A near-field measurement system includes a measurement probe 11 that receives a radio signal that is transmitted from an antenna under measurement 110 at a plurality of measurement positions included in a predetermined scan range, a frequency converter 13 that frequency-converts a frequency of the radio signal to a desired frequency, a timing processing unit 18 that 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 device 100 in synchronization with transmission of the radio signal, and an amplitude and phase calculation unit 19 that acquires a radio signal frequency-converted by a frequency converter 13 and digitized by an A/D converter 14a on 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.

Abstract: Provided is an antenna device used for evaluating a transmission characteristic or a reception characteristic of equipment under test (EUT) having an array antenna that includes a plurality of antenna elements arranged in a plane at predetermined intervals. The antenna device includes an antenna for receiving a modulated signal radiated by the EUT via the array antenna or radiating a modulated signal to the array antenna. The antenna is disposed at a position on a z-axis perpendicular to the plane defined by the plurality of antenna elements such that a group delay distortion of the modulated signal is reduced in a near-field region.

Abstract: Provided is an antenna device used for evaluating a transmission characteristic or a reception characteristic of equipment under test (EUT) having an array antenna that includes a plurality of antenna elements arranged in a plane at predetermined intervals. The antenna device includes an antenna for receiving a modulated signal radiated by the EUT via the array antenna or radiating a modulated signal to the array antenna. The antenna is disposed at a position on a z-axis perpendicular to the plane defined by the plurality of antenna elements such that a group delay distortion of the modulated signal is reduced in a near-field region.

Abstract: An electric field intensity distribution measurement device 1 that measures, in a near field, a radio signal transmitted from an antenna 110 including a plurality of antenna elements T1 to TN integrated into a transmission device 100 includes a measurement antenna 11 that receives the radio signal as a measurement signal at a plurality of scanning points included in a predetermined scanning range, a reference antenna 12 that receives the radio signal as a reference signal, a phase difference and amplitude calculation unit 16 that calculates a phase difference between a measurement signal and a reference signal with respect to each scanning point, and an amplitude of the measurement signal, and a far-field electric field intensity distribution calculation unit 17 that calculates an electric field intensity distribution in a far field using information on the phase difference and the amplitude calculated by the phase difference and amplitude calculation unit 16.

Abstract: A near-field measurement system includes a measurement probe 11 that receives a radio signal that is transmitted from an antenna under measurement 110 at a plurality of measurement positions included in a predetermined scan range, a frequency converter 13 that frequency-converts a frequency of the radio signal to a desired frequency, a timing processing unit 18 that 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 device 100 in synchronization with transmission of the radio signal, and an amplitude and phase calculation unit 19 that acquires a radio signal frequency-converted by a frequency converter 13 and digitized by an A/D converter 14a on 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.

Abstract: An electric field intensity distribution measurement device 1 that measures, in a near field, a radio signal transmitted from an antenna 110 including a plurality of antenna elements T1 to TN integrated into a transmission device 100 includes a measurement antenna 11 that receives the radio signal as a measurement signal at a plurality of scanning points included in a predetermined scanning range, a reference antenna 12 that receives the radio signal as a reference signal, a phase difference and amplitude calculation unit 16 that calculates a phase difference between a measurement signal and a reference signal with respect to each scanning point, and an amplitude of the measurement signal, and a far-field electric field intensity distribution calculation unit 17 that calculates an electric field intensity distribution in a far field using information on the phase difference and the amplitude calculated by the phase difference and amplitude calculation unit 16.