Читать книгу RF/Microwave Engineering and Applications in Energy Systems - Abdullah Eroglu - Страница 30

We need to find

Since the geometry is circular, it is easier to work with a cylindrical coordinate system, hence we transform vector to cylindrical coordinates as

Figure 1.13 Path for line integral Example 1.1.

In a cylindrical coordinate system, the differential length along the path is defined as

where r = 2 along the path. So

Figure 1.14 Illustration of surface integral.