Articles
A Conformal Scheme For Simulation Of Thin Good Conducting Objects In FDTD
July 13, 2009
•White Paper: A Conformal Scheme For Simulation Of Thin Good Conducting Objects In FDTD
By Remcom, Inc.
Thin good conductors are common materials used in design of antennas and microwave circuits. However, it is difficult to simulate a thin good conducting object (thinner than a cell size) efficiently and effectively by the conventional staircased FDTD, conformal PEC or conformal good conductor FDTD. An accurate surface impedance model for modeling thin conducting layers in FDTD was proposed in [1]. In this paper, we extend this surface impedance model to arbitrarily shaped thin good conductors in FDTD simulation. For this purpose, the following conformal techniques are ready for us to use. A conformal technique for simulating a thin PEC object was presented in [2], which uses update equations for a cell separately on each side of the thin object. In addition, conformal techniques for the simulation of good conductors in FDTD are available in [3] and [4]. Here we present a conformal scheme for accurately and effectively simulating arbitrarily shaped thin good conductors in FDTD by combining the surface impedance model for thin conducting layers, conformal thin PEC technique, and conformal technique for good conductors. A simulation example is given for demonstrating the effectiveness of the proposed scheme. The stability and limitation of this scheme is also discussed.
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