Patent ID: 8643553
Filing Date: 2014-02-04
Classification: G01R

Abstract:
1. A radiation power measuring method of measuring the total radiated power of an object to be measured by using a structure in which radio waves are emitted from the object which is disposed in the vicinity of one focus in a closed space that forms a spheroid obtained by rotating an ellipse about an axis passing through two focuses and is surrounded by a metal wall surface and are reflected from the wall surface to be concentrated on a receiving antenna which is disposed in the vicinity of the other focus and a power measuring device measures the power of an output signal from the receiving antenna, comprising: a step of arranging the object in the vicinity of the one focus and arranging the receiving antenna in the vicinity of the other focus; a step of arranging a variable phase shifter that changes the phase of the output signal from the receiving antenna and a two-branch circuit that branches the output signal from the variable phase shifter into two signals, one of which is connected to a reflective element and the other of which is connected to the power measuring device, and calculating a maximum value and a minimum value of power measured by the power measuring device according to changes of the phases by the variable phase shifter; a step of calculating an output reflection coefficient of the inside of the spheroid from the maximum value and the minimum value of the power measured by the power measuring device and using the output reflection coefficient as an input reflection coefficient of the object; and a step of calculating the total radiated power of the object, on the basis of the input reflection coefficient of the object and reception power when the power measuring device directly measures the output signal from the receiving antenna.