Rotation

A single differential of angle in the upper right of the main screen is used to control rotation of the radiator in space as well as the phases of currents and fields under consideration. The polarization of the radiation as shown by dA and dr rotates with the rotation of the radiator.

A quadrupole off origin emits 1 mW. The peak current is 7.363 mA. The Poynting vector at the target is .533 mW/m^2 . dA shows radiation polarized in x direction.

The radiator is rotated by pi/8 around the y axis. The polarization shown in dA rotates in response. The sphere power and Poynting vector at the target are unchanged. The Poynting vector in the xy plane is altered.

dr shows the rotated transverse spherical components of the radiation along dr.

dr shows the rotation of the transverse spherical components of the radiation along dr, with the source restored to the xy plane.

The source is rotated in the xy plane, changing the direction of the Poynting field. The sphere power is unchanged because the range of the source is less than r.