For electromagnetic systems, the discrete model is formed by conceptually filling space with a network of transmission-lines in such a way that the voltage and current give information on the electric and magnetic fields.
(the discrete model; is formed; by conceptually filling space with a network of transmission-lines in such a way that the voltage and current give information on the electric and magnetic fields)
the discrete model
is formed
by conceptually filling space with a network of transmission-lines in such a way that the voltage and current give information on the electric and magnetic fields