2019-09-17

Towards Flexible Antenna Measurements and Field Transformations in Arbitrary Environments

Prof. Dr. Thomas Eibert, Technical University of Munich, Germany

26 Sep 2019, 14:00–15:30; Location: S2|17-103

Due to the continuously increasing use of electromagnetic services for communications and sensor functionalities, the accurate and reliable characterization of antennas by measurements becomes increasingly important. Traditionally, antenna measurements have been performed in very specialized measurement chambers, which are very expensive and not very flexible in use. The antennas must be brought into the chamber and the measurements must be performed with great care. Due to reduced size requirements for the chamber, near-field measurements with subsequent near-field far-field transformations have become standard over the past years. A particular requirement of near-field measurements is the need to measure amplitude and phase in very many measurement locations, in the ideal case on a closed surface around the test object, where phase coherence must be maintained among all measurement values. Classical near-field far-field transformation approaches were also designed for very specialized and inflexible measurement configurations, such as for spherical measurements with equidistant sampling or for measurement planes with equidistant sampling. In recent years, more flexible near-field far-field transformation approaches have been established which allow for much more flexibility and which give more insight into the radiation mechanisms of the test antennas at the same time. With such novel transformation capabilities, completely new measurement scenarios can be thought of, where it seems possible that we have very flexible and portable measurement solutions in a couple of years, which “can come” to the antenna, where ever it is, and not vice versa.

 

Starting from basic considerations of antenna measurements, the presentation will introduce a very flexible and powerful near-field far-field transformation approach, which is able to transform measured fields in arbitrary locations and measured with more or less arbitrary probes. Based on these considerations, the capabilities of this approach will be demonstrated for a variety of near-field measurements, where far-field results and diagnostic capabilities will be discussed. Due to their increasing importance, measurement scenarios for automobiles will be considered, where the automobile is e.g. located on a metallic ground plane. Since the measurement of coherent phases can be problematic in many applications, the possibility of phaseless measurements with subsequent near-field far-field transformation will be considered and approaches towards near-field measurements and transformations in fully reflective environments will also be discussed. The presentation will close by looking into concepts of drone based near-field measurements and transformations.

 

Bio

Thomas F. Eibert received the Dipl.-Ing. (FH) degree in electrical engineering from Fachhochschule Nürnberg, Nuremberg, Germany, the Dipl.-Ing. degree in electrical engineering from Ruhr-Universität Bochum, Bochum, Germany, and the Dr.-Ing. degree in electrical engineering from Bergische Universität Wuppertal, Wuppertal, Germany, in 1989, 1992, and 1997, respectively. From 1997 to 1998, he was with the Radiation Laboratory, Electrical Engineering and Computer Science Department, University of Michigan, Ann Arbor, MI, USA. From 1998 to 2002, he was with Deutsche Telekom, Darmstadt, Germany. From 2002 to 2005, he was with the Institute for High-Frequency Physics and Radar Techniques of FGAN e.V., Wachtberg, Germany, where he was the Head of the Department of Antennas and Scattering. From 2005 to 2008, he was a Professor of Radio Frequency Technology with the Universität Stuttgart, Stuttgart, Germany. Since 2008, he has been a Professor of High-Frequency Engineering with the Technical University of Munich, Munich, Germany. His current research interests include numerical electromagnetics, wave propagation, measurement and field transformation techniques for antennas and scattering, and all kinds of antenna and microwave circuit technologies for sensors and communications.

Category: CE Seminar

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Technische Universität Darmstadt

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