Meaning
Measurement techniques for antenna characterization capture electromagnetic fields across two perpendicular surfaces to construct a three-dimensional radiation pattern. Systems employing dual plane scanning reduce the physical movement required to evaluate the field distribution of a device under test. This method is particularly suited for testing planar arrays and high-frequency communication modules.
Operational Mechanism
A probe moves along orthogonal axes to record amplitude and phase data from the radiating element. By executing dual plane scanning, the scanner acquires both vertical and horizontal polarization components in a single test sequence. The collected field data is then processed using near-field to far-field transformation algorithms to determine the directional properties of the transmitter.
This dual approach saves time compared to full spherical scans while providing sufficient data to characterize the main lobe and first sidelobes of the antenna.
System Integration
Integrating the scanner into a production line requires precise mechanical synchronization and electromagnetic shielding. When dual plane scanning is implemented, the motion controllers must maintain sub-millimeter positioning accuracy to avoid phase errors at millimeter-wave frequencies. This accuracy ensures that the test system remains stable over thousands of continuous duty cycles.
Measurement Resolution
The distance between sampling points on each plane determines the highest frequency that the scan can accurately resolve. In dual plane scanning, the spatial sampling interval must be less than half the wavelength of the test signal. This constraint prevents aliasing and ensures the fidelity of the reconstructed antenna pattern.
