Compact multi-probe antenna test station for rapid testing of antennas and wireless terminals

Abstract

Rapid characterization and prequalification measurements are becoming more and more important for the ever-growing number of small antennas, mobile phones and other wireless terminals. There is a need, driven by the wireless industries, for a smart test set-up with reduced dimensions and capable of measuring radiating devices. Satimo has developed a compact, mobile and cost-effective test station called StarLab which is able to perform rapid 3D measurements of the patterns radiated by wireless devices. The StarLab equipment is derived from Satimo's StarGate spherical near field test ranges. StarLab uses a circular probe array to allow for real time full elevation cuts and volumetric 3D radiation pattern measurement within a few minutes. It operates between 400 MHz and 6 GHz and can be configured for passive measurements and also cable-less active measurements. The paper describes the multi-probe antenna test station and its different configurations for passive and active measurements. The accuracies for gain and power measurements are also presented, as well as considerations on the total radiated power measured by the equipment. Additionally, calibration issues are discussed. Finally, measurements performed with the StarLab test station at Satimo are shown and illustrate the capabilities of the system. The measurement results are validated by comparison to the results obtained in other test ranges.