Title :
Multimode parameter extraction for multiconductor transmission lines via single-pass FDTD and signal-processing techniques
Author :
Wang, Yuanxun ; Ling, Hao
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
fDate :
1/1/1998 12:00:00 AM
Abstract :
We present two approaches to extract the broadband multimode parameters of guided wave structures from a single-pass finite-difference time-domain (FDTD) simulation. They include a two-dimensional (2-D) Fourier transform (FT) algorithm and a super-resolution estimation of signal parameters via rotational invariance technique (ESPRIT) algorithm. Comparison is made to show the superiority of the super-resolution approach. As a typical application, a three-line coupled microstrip structure is studied. After a single-pass FDTD simulation, broadband multimode parameters such as propagation constants, modal-field templates, and modal impedances are extracted and verified against published data obtained by the spectral-domain method. The main feature of this parameter-extraction methodology is that it decouples the computational electromagnetics engine (in this case, the FDTD simulator) from the post-processing parameter-extraction algorithm, thus providing more flexibility and connectivity among the various simulation tools
Keywords :
Fourier transforms; finite difference time-domain analysis; parameter estimation; signal processing; transmission line theory; 2D Fourier transform algorithm; ESPRIT algorithm; broadband multimode parameters; finite-difference time-domain simulation; guided wave structures; modal impedances; modal-field templates; multiconductor transmission lines; multimode parameter extraction; propagation constants; rotational invariance technique; signal parameters; signal-processing techniques; single-pass FDTD; super-resolution estimation; three-line coupled microstrip structure; Computational modeling; Finite difference methods; Fourier transforms; Microstrip; Parameter estimation; Parameter extraction; Propagation constant; Signal resolution; Time domain analysis; Two dimensional displays;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on