US 8,525,744 B2 · Radiated power measurement method, radiated power measurement coupler and radiated power measurement apparatus

Abstract

In a method of measuring a radiation power generated from a DUT from an output of a measurement antenna, wherein the DUT is arranged in an ellipsoid enclosed space such that a radiation center of the radio wave is substantially coincided with the neighborhood of a first focal point. The radio wave radiated from the DUT and reflected from the wall surface is received by a receiving antenna arranged in the neighborhood a second focal point thereby to measure the total radiated power of the DUT from the output signal of the receiving antenna. One of the DUT and the receiving antenna is moved along the axis passing through the first and second focal points, and based on the measurement value maximizing the output signal power of the receiving antenna, calculating the total radiated power of the DUT.

Claims17

Dependent claims

A radiated power measurement method comprising the steps of

arranging a device under test capable of radiating a radio wave in an enclosed space having first and second focal points, in such a manner that the radiation center of the radio wave of the device under test substantially coincides with the neighborhood of the first focal point, wherein the enclosed space is defined by a metal wall surface of an ellipsoid obtained by rotating an ellipse around an axis passing through the first focal point and the second focal point;
and
reflecting the radio wave radiated from the device under test, on the wall surface, and receiving the radio wave by a receiving antenna arranged in the neighborhood the second focal point thereby to measure, at the measuring end of the receiving antenna, the total radiated power of the device under test from the output signal of the receiving antenna, wherein at least one of the device under test and the receiving antenna is moved along the axis passing through the first and second focal points, and based on the measurement value maximizing the output signal power of the receiving antenna, calculating the total radiated power of the device under test.

A radiated power measurement coupler configured to measure a radiated power, and comprising a radiator which radiates a radio wave and a receiving antenna which receives the radio wave radiated from the radiator, wherein the radiator includes one of a device under test and a reference antenna, the radiator and the receiving antenna are supported in an enclosed space defined by a metal wall surface, the receiving antenna receives the radio wave radiated from the radiator to output the receiving signal, and the coupler further comprises:

a radiator support unit with the enclosed space formed as an ellipsoid obtained by rotating an ellipse around an axis passing through first and second focal points and the radiator supported in such a manner that the radiation center of the radio wave of the radiator is located in the neighborhood of the first focal point of the ellipse;
a receiving antenna support unit which supports the receiving antenna with the central position thereof located in the neighborhood of the second focal point of the ellipse;
and
a moving unit which moves at least selected one of the radiator and the receiving antenna along the axis passing through the first and second focal points,
wherein the radio wave radiated from the radiator is reflected on the wall surface and received by the receiving antenna while at the same time changing the relative positions of the radiator and the receiving antenna by the moving unit thereby to maximize the output signal power of the receiving antenna.

2 more elements

Dependencies are inferred from the claim text.

Radiated power measurement method, radiated power measurement coupler and radiated power measurement apparatus

Life of this patent

Radiated power measurement method, radiated power measurement coupler and radiated power measurement apparatus

Life of this patent

Abstract

Claims17