Читать книгу RF/Microwave Engineering and Applications in Energy Systems - Abdullah Eroglu - Страница 34

The del operator, ∇, is used as a differential operator and can be used to find the gradient of a scalar, divergence of a vector, curl of a vector, or Laplacian of a scalar in electromagnetics. These operations can be expressed as

 ∇F for finding the gradient of a scalar

  for finding the divergence of a vector

  for finding the curl of a vector

 ∇2F for finding the Laplacian of a scalar

The del operator, in three different coordinate systems, can be written in the following forms

(1.49)

(1.50)

(1.51)