Patent ID: 11921140
Assignee: ANRITSU CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G

Claim 11:
12. A test method using a test apparatus that measures transmission characteristics or reception characteristics of a device under test including an antenna under test, the test apparatus including
an anechoic box that has an internal space that is not influenced by a surrounding radio wave environment,
a posture changeable mechanism that sequentially changes a posture of the device under test disposed in a quiet zone in the internal space,
a first test antenna and a second test antenna that are accommodated in the internal space and transmit or receive radio signals to or from the antenna under test, for measuring the transmission characteristics or the reception characteristics of the device under test,
a reflector that reflects a radio signal radiated by the first test antenna and converts the radio signal into a plane wave radio signal, and
a movable antenna mechanism that moves a position of the second test antenna such that the radio signal is transmitted to or received from the device under test installed in a far field at a plurality of angles of arrival or a plurality of angles of departure, with reference to a radio-wave arrival direction from the first test antenna or a radio wave emission direction to the first test antenna,
the method comprising:
a step of selecting one angle of arrival among a plurality of angles of arrival or one angle of departure among a plurality of angles of departure;
a step of moving the second test antenna by the movable antenna mechanism to have the selected angle of arrival or angle of departure;
a step of sequentially changing the posture of the device under test disposed in the quiet zone; and
a step of measuring the transmission characteristics or the reception characteristics of the device under test by using the first and second test antennae, each time the posture of the device under test is changed.