Broadband property and time-domain application of general transmission-line equations on microstrip low-pass filter

General transmission-line equations based on the theory of differential equations [1] were introduced in [2] and [3]. The equations dispersion characteristic of a microstrip low-pass filter is studied. The parameters L. C, alpha, and beta of general transmission-line equations are found to be almost invariant to frequency in the passband of the microstrip low-pass filter. By restoring current and voltage distributions with the use of equations in both frequency and time domains, the broadband property of these equations on the microstrip low-pass filter is evident. (C) 2002 Wiley Periodicals, Inc.