METHOD OF DETERMINING APPLICATION RANGE FOR PLANAR SCANNING NEAR-FIELD ANTENNA MEASUREMENT

摘要

PROBLEM TO BE SOLVED: To easily determine an application range for measurement of a near- field while considering the number of lobes, in a method of determining the application range for the measurement of planar scanning near-field for measuring an electromagnetic field on a plane in the vicinity of an antenna using a probe. SOLUTION: An upper limit value NWn (D) of a wavelength capable of measuring a distant-field directivity within a angle range from a main beam to the (n-1)th side lobe is found pursuant to following expression (1) to determine the application range, whereλ0 is a free space wavelength in a measuring frequency f; D is a diameter of an aperture of the antenna; W is a scanning range of the antenna; andαλ0 is an distance between the antenna and the probe.