An infinite-dimensional electromagnetic system model wi th distortionless transmission line of the terminal diode was developed.Based o n the boundary conditions

an Poincaré map of the voltage wave at the left end of the system was derived by using the characteristics method.The stability at the fixed point and the dynamical behaviors of the map of the voltage wave at th e left end were analyzed based on nonlinear dynamics theory.Thanks to numerical results

the phenomena of bifurcations and chaos of the system were analyzed wi th the variation of system parameter in detail

and the effects of the DC bias v oltage source on the dynamics behaviors of the system were investigated.These r esearch results show that there are complex nonlinear dynamical behaviors in thi s electromagnetic system under certain parametric condition

such as bifurcation

chaos and intermittent chaos and so on

and the presence of the DC bias voltag e source accelerates the routes from period-doubling bifurcations to chaos.