Meaning
Electro-mechanical apparatuses that rotate a device under test through multiple planes allow for the comprehensive measurement of radiation patterns or mechanical stress. A multi-axis test fixture holds the unit securely while allowing a probe or an antenna to capture data from every angle. This movement is often coordinated by a computer to ensure that the sampling points are distributed evenly across a sphere.
Motion Control
Precision stepper motors and encoders provide the feedback necessary to position the device with high angular accuracy. In a multi-axis test fixture, the speed of rotation is carefully managed to avoid introducing mechanical vibration that could disturb the measurement. Software scripts define the path of the move, ensuring that the cables do not become tangled or strained during the rotation.
Measurement Scope
Mapping the gain of an antenna requires thousands of individual data points taken at specific increments of azimuth and elevation. The multi-axis test fixture enables the collection of this data in a fraction of the time required for manual positioning. High resolution scans provide the detail needed to identify nulls or side lobes in the radiation pattern.
Integration Interface
The mechanical mount must be transparent to radio waves to avoid interfering with the antenna under test.
