Title :
Modeling of nonlinear active regions in TLM (distributed circuits)
Author :
Russer, Peter ; So, Poman P M ; Hoefer, Wolfgang J R
Author_Institution :
Lehrstuhl fuer Hochfrequenztech., Tech. Univ., Munchen, West Germany
Abstract :
A transmission line matrix (TLM) method for modeling distributed circuits containing nonlinear active elements and structures is demonstrated. The scattering properties of the nonlinear element are expressed in terms of differential equations that are solved by stepwise integration with the time step of the TLM algorithm. A cavity oscillator with an active diode with a finite cutoff frequency has been modeled. Spurious oscillations of the TLM mesh that regularly occur when including negative conductivity or pulse reflection coefficients larger than unity were effectively suppressed.<>
Keywords :
S-matrix theory; distributed parameter networks; microwave oscillators; nonlinear network analysis; solid-state microwave circuits; transmission line theory; TLM algorithm; TLM mesh; active diode; cavity oscillator; differential equations; distributed circuits; microwave circuits; modeling; negative conductivity; nonlinear active regions; pulse reflection coefficients; scattering properties; spurious oscillations suppression; stepwise integration; transmission line matrix; Admittance; Circuits; Conductivity; Cutoff frequency; Electromagnetic modeling; Joining processes; Power transmission lines; Transmission line matrix methods; Transmission lines; Voltage;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
