Advances in Radio Science www.adv-radio-sci.net 1684-9965 1684-9973 5 Kleinheubacher Berichte 2006 2007 10.5194/ars-5-127-2007 http://www.adv-radio-sci.net/5/127/2007/ http://www.adv-radio-sci.net/5/127/2007/ars-5-127-2007.html http://www.adv-radio-sci.net/5/127/2007/ars-5-127-2007.pdf 127 133 2007-06-12 Extended post processing for simulation results of FEM synthesized UHF-RFID transponder antennas R. Herschmann herschmann@hft.uni-hannover.de M. Camp H. Eul Leibniz Universität Hannover, Institute of Radiofrequency and Microwave Engineering, Appelstraße 9a, 30167 Hannover, Germany Smart Devices GmbH & Co. KG, Schönebecker Allee 2, 30823 Garbsen, Germany The computer aided design process of sophisticated UHF-RFID transponder antennas requires the application of reliable simulation software. This paper describes a Matlab implemented extension of the post processor capabilities of the commercially available three dimensional field simulation programme Ansoft HFSS to compute an accurate solution of the antenna's surface current distribution. The accuracy of the simulated surface currents, which are physically related to the impedance at the feeding point of the antenna, depends on the convergence of the electromagnetic fields inside the simulation volume. The introduced method estimates the overall quality of the simulation results by combining the surface currents with the electromagnetic fields extracted from the field solution of Ansoft HFSS. Herschmann, R., Camp, M., and Eul, H.: Design und Analyse elektrisch kleiner Antennen für den Einsatz in UHF RFID Transponder, Adv. Radio Sci., 4, 93–98, 2006. Makarov, S. N.: Antenna and EM Modeling with MATLAB, John Wiley & Sons Inc., 2002. Persson, P.-O.: Mesh Generation for Implicit Geometries, in: Department of Mathematics, PhD thesis, Massachusetts Institute of Technology, 2005. Stutzman, W. L. and Thiele, G. A.: Antenna theory and design, 2nd ed., New York, Wiley, 1998.