FDTD modeling of matched impedance terminating a microstrip line.

An efficient matched-impedance scheme for the finite-difference time-domain (FDTD) analysis of microstrip circuits is presented. In conventional extended FDTD schemes, the resistive load is introduced as a thin-line model or is uniformly assigned into a number of cells. The assigning scheme does not agree with the electromagnetic distribution in the microstrip line, and thus causes some reflection errors. The proposed scheme uses the effective impedance of the microstrip line as the value of matched resistive load and assigns it into the resistive-load mesh region in a proper proportion in order to reduce the reflection errors. The results of the numerical examples show that the reflections can be significantly reduced by this novel scheme. © 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005. [ABSTRACT FROM AUTHOR]