Luc Duchesne

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

Rapid characterization and pre-qualification measurements are becoming more and more important for the ever-growing number of small antennas, mobile telephones 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 pattern radiated by wireless devices. The StarLab equipment is derived from Satimos StarGate systems which are now well established 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 cableless active measurements. This paper describes in detail 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.

Non-invasive statistical SAR assessment from rapid near-field measurements in a spherical antenna test range

SAR considerations constitute a key issue for portable phones. While standard SAR measurements require heavy and time consuming testing procedures, a strong demand exists for faster SAR assessment approaches. Such a need is more particularly pronounced, for instance, during the design phase of new terminal antennas, or when conducting pre-compliance measurements. This paper describes a new approach, which exhibits the particularity to be non-invasive and then fully compatible with usual antenna testing techniques. Furthermore, this approach is statistically based. The result is obtained in terms of probability for the SAR not to exceed some given value.

A novel and innovative near field system for testing radomes of commercial aircrafts

Current techniques for testing of aircraft radomes are time consuming, not as precise as desired, and requires dedicated far field test range, compact test range, or anechoic chamber, or other specific systems for measuring one or other of the parameters. To overcome all these limitations, and to obtain a unique system for a complete diagnosis, a novel technique of radome characterization is proposed and detailed in this article. Based on a Near-Field network of probes placed in the vicinity of the radome under test, this innovative Near-Field measurement system is fully compliant with the updated standard RTCA/DO213A and leads to accurate evaluation of many parameters such as transmission efficiency and beamwidth, while reducing the measurement time required.