May 1, 2000

Novel Probes and Evaluation Procedures to Assess Field Magnitude and Polarization

Katja Pokovic, Thomas Schmid, Jürg Fröhlich, and Niels Kuster, IEEE Transactions on Electromagnetic Compatibility, Volume 42, Issue 2, pp. 240–244, May 2000

The immense development rate of wireless technologies has also brought new requirements for the RF design of transmitters. The design challenge is to optimize multiband devices with minimal dimensions and weight as well as an appealing appearance, which nevertheless operate well within varyingly complex environments such as frequently changing positions within the closest vicinity of the human body. The optimization of such transceivers requires new analysis tools providing precise measurement of electric and magnetic field strength distributions, even in the closest proximity of RF transmitters. In this study, novel field probes were analyzed optimized, and constructed enabling not only the assessment of the local field strength, but also information on the polarization of the field. The ellipse parameters are reconstructed by a combination of a downhill simplex and a Givens updating algorithm, which has proven to be fast and robust. The developed probes and procedures greatly enhance the quality of the information needed for analysis and optimization of antennas and transmitters.