Patent ID: 8400366
Filing Date: 2013-03-19
Classification: G01R

Abstract:
1. A radiation efficiency measuring apparatus, comprising: a target antenna to be measured, a measuring antenna arranged at a position spaced apart from the target antenna by a distance dimension of R, an electromagnetic field measuring device, connected to the measuring antenna, for measuring an electromagnetic field radiated by the target antenna, elevation angle switching means for switching an elevation angle φ of the target antenna between first and second angles φ azimuth angle rotation means for rotating the target antenna to an azimuth angle θ, first radiation pattern measuring means for causing the azimuth angle rotation means to rotate the target antenna to a azimuth angle θ with the elevation angle φ of the target antenna switched to the first angle φ second radiation pattern measuring means for causing the azimuth angle rotation means to rotate the target antenna to the azimuth angle θ with the elevation angle φ of the target antenna switched to the second angle φ radiation efficiency calculating means for calculating a radiation efficiency η of the target antenna on the basis of the first and second azimuth angle plane radiation patterns S where λ represents a wavelength of a measuring frequency, G represents a gain of the measuring antenna, Δφ represents a measuring angle step in the elevation angle φ direction, and Δθ represents a measuring angle step in the azimuth angle θ direction.