Chapter 4: Energy Density of the Electrostatic Field

Illustration 2


The electric field energy density is given by

, J/m3

It helps compute the overall energy stored in an electric structure: , J. Note that the energy density inside perfect conductors is zero since the electric field vector vanishes.

Click below to view the energy density distribution in the cross-section of three transmission-line structures:

Ø      Parallel-plate line

Ø      Coaxial line

Ø      Two-wire line

 
Figures (click to enlarge)
Figure 1

Figure 2

Figure 3

Figure 1

Figure 2

Figure 3