Patent ID: 8103470

Claim:
A method for measuring a radiation power comprising: preparing an elliptical mirror having a closed space which has an elliptical spherical shape and which is enclosed by a metal wall surface, the elliptical spherical shape being obtained by rotating an ellipse by a predetermined angle about an axis line passing through two focal points thereof; placing a device under test which can radiate a radio wave, in a position of one of the two focal points in the closed space of the elliptical mirror such that a center of radiation of a radio wave therefrom substantially coincides with the focal point; placing a receiving antenna in a position of an other one of the two focal points in the closed space of the elliptical mirror; and in the closed space of the elliptical mirror, causing the device under test disposed in the position of the one focal point to radiate a radio wave and causing the radio wave radiated from the device under test to be reflected at the wall surface to allow the receiving antenna disposed in the position of the other focal point to receive the radio wave, and measuring total radiation power of the radio wave radiated from the device under test at a measurement end of the receiving antenna in accordance with an output signal from the receiving antenna, the measuring total radiation power comprising: with a continuous wave being radiated from the device under test, measuring a received power value PL of the receiving antenna through the measurement end of the receiving antenna, the continuous wave having a predetermined measurement frequency; with the radio wave radiation from the device under test being stopped, applying power having the predetermined measurement frequency to the measurement end of the receiving antenna and measuring power reflected from the receiving antenna through the measurement end, whereby a reflection coefficient value S 22 of the receiving antenna is measured; and based on the value of received power PL which is measured in the step of measuring a received power value PL of the receiving antenna, and the reflection coefficient value S 22 which is measured in the step of measuring a reflection coefficient value S 22 of the receiving antenna, calculating power proportional to a total radiation power value Pr of the device under test by a following equation: PL /(1 −|S 22| 2 ).