Title :
A new efficient excitation scheme for the FDTD method based on the field and impedance template
Author :
Celuch-Marcysiak, M. ; Kozak, A. ; Gwarek, W.K.
Author_Institution :
Inst. of Radioelectron., Warsaw Univ. of Technol., Poland
Abstract :
We have presented a new excitation scheme for the FDTD analysis of guided wave problems. Tangential E-field components in the input plane are driven by elementary sources with both amplitude and output impedance determined by the modal template. This permits accurate FDTD simulations using only short sections of input feeds. For typical microwave circuits such as a patch antenna considered in the present paper, a reduction in computer resources by a factor of two is achieved. The templates are established automatically by the 2DV FDTD algorithm operated in an optimization loop. By using the 2DV rather than 3D FDTD template generation, we can easily consider a fundamental mode or any higher mode, and distinguish between two propagating modes such as an odd and even mode in the presented example of asymmetrical coupled microstrip lines.
Keywords :
antenna theory; electric impedance; finite difference time-domain analysis; microstrip antennas; microstrip discontinuities; optimisation; waveguide theory; 2DV FDTD algorithm; FDTD method; asymmetrical coupled microstrip lines; efficient excitation scheme; fundamental mode; guided wave problems; higher mode; impedance template; input plane; microwave circuits; optimization loop; patch antenna; tangential E-field components; Boundary conditions; Circuit simulation; Finite difference methods; Frequency; Impedance; Microwave circuits; Reflection; Scattering parameters; Switches; Time domain analysis;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1996. AP-S. Digest
Print_ISBN :
0-7803-3216-4
DOI :
10.1109/APS.1996.549834