Patent ID: 8228247

Claim:
An antenna-characteristic measuring apparatus comprising a radio anechoic container internally provided with a radio wave absorber, a measured antenna placed inside the radio anechoic container and to be subjected to measurement, and a measuring antenna positioned inside the radio anechoic container and opposite the measured antenna and configured to measure antenna characteristics of the measured antenna, wherein said measuring antenna is mounted movably inside the radio anechoic container for setting a distance L along a length direction between the measured antenna and the measuring antenna to satisfy the following relationship: ( D + d ) 2 2 ⁢ ⁢ λ ≤ L ≤ 2 ⁢ ( D + d ) 2 λ where D denotes aperture size of the measured antenna, d denotes aperture size of the measuring antenna, and λ denotes wavelength of a measurement frequency.