Applied Electronics 2014 September 10 2014 Pilsen 3
Applied Electronics 2014 September 10. 2014. Pilsen 3 D FEM Simulation of Small Stripline for EMC Testing Zdeněk Kubík 1), Jiří Skála 1), Denys Nikolayev 2) University of West Bohemia in Pilsen Faculty of Electrical Engineering 1) Department of Applied Electronics and Telecommunications 2) Department of Theory of Electrical Engineering
ABSTRACT • This presentation overviews the measurement and simulation of the electric parameters of a small stripline. • The stripline was designed and built for electromagnetic compatibility (EMC) testing of small electronic devices with the accent on electromagnetic immunity (EMI) testing. • The paper describes the measurement of electric field inside the stripline in an anechoic chamber • and the simulation using parametric 3 D finite element method (FEM) model that confirms the measurement results. • The simulation results demonstrate also the usable area inside the stripline for EMI testing.
INTRODUCTION EMC and stripline
INTRODUCTION EMC and stripline
INTRODUCTION Small stripline for EMC measurement Figure 2: CAN bus termination Figure 3: Current wave of ESD generator for different generator voltage from 2 k. V to 16 k. V
STRIPLINE MEASUREMENT Stripline measurement Figure 4: Transceiver physical layer definitions
STRIPLINE MEASUREMENT Important parts of CAN
STRIPLINE SIMULATION 3 D FEM model – Wave equation: – Wave number of free space: – Lumped port: – Impedance boundary condition: – PMLs:
STRIPLINE SIMULATION Model convergence – Calculate total electric energy in the model
STRIPLINE SIMULATION Time and memory dependences on DOF
STRIPLINE SIMULATION Simulation result
STRIPLINE SIMULATION Electric field distribution in the model 100 MHz 1 MHz 250 MHz 750 MHz
RESULTS COMPARISON Figure 13: Schematic diagram Figure 14: Untypically terminated bus – 120 ohm + 10 kohm – output from the CAN transmitter Figure 15: Untypically terminated bus – 120 ohm + 10 kohm – input of the CAN receiver Figure 16: Untypically terminated bus – 120 + 60 ohm – output from the CAN transmitter
CONCLUSIONS • • • This paper overviewed the measurement and simulation of the small stripline. The stripline was designed for EMC measurements of small electronic devices, especially for EMI tests. The electric parameter S 11 of the stripline was discussed in the previous paper [22]. The electric field probe HI-6005 was used for the measurement of the electric field inside the stripline; the main advantage of the probe is its optical output, the field inside cavity is not affected by metallic wires. Finite element method was chosen for simulation of the stripline; 3 D FEM parametric model was created, and the total electric energy calculation was used to verify the model. The dependence of total electric energy on the degrees of freedom demonstrated the model convergence and justified the accuracy. The solution time linearly increases with number of DOFs as well as used RAM. The comparison of measured and simulated electric field in the middle of the stripline shows good agreement. The further research is focused on the new impedance matching based on ferromagnetic materials and the design of the large stripline with prolonged cavity (circa 2 m).
Applied Electronics 2014 September 10. 2014. Pilsen Thank you for your attention. 3 D FEM Simulation of Small Stripline for EMC Testing Zdenek Kubik zdekubik@kae. zcu. cz www. fel. zcu. cz UWB in Pilsen Univerzitni 26 306 14. Plzen Czech Republic
- Slides: 15