Читать книгу RF/Microwave Engineering and Applications in Energy Systems - Abdullah Eroglu - Страница 31

Consider the region given in Figure 1.14. The surface integral is then defined as the flux of the vector through surface S and expressed as

(1.46)

The normal vector is normal on S at any point. The outward flux of the vector shown for a closed surface is then defined by

(1.47)