Influence of the non-regular deformed boundary of a TEM-waveguide to the field distribution

• Applicant: Professor Dr.-Ing. Heyno Garbe
• Subject Area: Electronic Semiconductors, Components and Circuits, Integrated Systems, Sensor Technology, Theoretical Electrical Engineering
• Term: from 2020 to 2023
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 438107418

• Final Report Year: 2023

Final Report Abstract

The ongoing digitalization and electrification are transforming both technology and society. Driven by political, economic, and ecological factors such as the expansion of renewable energy, electric mobility, and industrial automation, EM-fields are increasingly prevalent in nearly all sectors of society. Against this backdrop, the precise measurement of field strength becomes essential for ensuring both human safety and technological compatibility. The requirements für EMC are rising, as both the interference potential and sensitivity to EM fields are increasing. To address the challenges in generating standard EM fields for calibration purposes, this project has developed a comprehensive concept for systematically determining uncertainties in the representation of EM fields in TEM-cells. The focus of the concept is on the modeling of geometric inhomogeneities and the application of various EM boundary conditions. By employing a semi-analytical method based on Schelkunoff’s concept of generalized telegraphists equations (GTEs), it is possible to calculate characteristic quantities like EM fields, resonances, and the coupling mechanisms of higher order modes with the TEM-mode in a reasonable timeframe.

Publications

• A Method to Approximate the Resonance Frequencies of a Coaxial TEM-Cell. 2020 IEEE Asia-Pacific Microwave Conference (APMC), 412-414. IEEE.
  Duc, Pham Hoang; Katja, Tuting; Heyno, Garbe & Michael, Koch
  
• Geometrische Unsicherheitsbetrachtung von rundkoaxialen TEM-Zellen, 2020 Internationale Fachmesse und Kongress für Elektromagnetische Verträglichkeit, Frankfurt/Main: Mesago, Köln
  H. D. Pham & H. Garbe
  
• Mode Coupling in TEM-Cells due to Variations in the Geometry using Generalized Telegraphist’s Equations. 2020 International Symposium on Electromagnetic Compatibility -EMC EUROPE, 1-6. IEEE.
  Duc, Pham Hoang & Heyno, Garbe
  
• Calculations of electromagnetic fields in longitudinal irregular TEM-cells. Advances in Radio Science, 19, 49–57.
  Pham, Hoang Duc; Tüting, Katja & Garbe, Heyno
  
• Concept to Evaluate and Quantify Field Inhomogeneities in Coaxial TEM-Cells. IEEE Transactions on Instrumentation and Measurement, 70, 1–14.
  Pham, Hoang Duc; Tuting, Katja & Garbe, Heyno
  
• Estimation of Measurement Uncertainties in TEM-Cells based on Generalized Telegraphist’s Equation. 2021 IEEE International Joint EMC/SI/PI and EMC Europe Symposium, 362-367. IEEE.
  Pham, Hoang Duc; Tuting, Katja; Garbe, Heyno & Fisahn, Sven