The phenomenon of energy unidirectional transmission is numerically investigated by using a system of two coupled discrete nonlinear electrical transmission lines,each line of the network contains a finite number of cells and has different pass band structures,respectively.Using numerical simulations,we examine the frequency multiplication of the driving frequency and the lattice filtering effect in the line.These lead to the generation of energy unidirectional transmission.In the present work,energy is carried by the second harmonic wave in the pass band.In addition,we also study the dependence of the energy efficiency on the driving amplitude and other parameters of the model,such as the system size and the nonlinear coefficient,by calculation.Furthermore,after detailed numerical simulation,an experimental demonstration is realized.The experimental results agree with those in simulation qualitatively.
