Directional characteristic and polarization of microwaves in front of a horn antenna

The experiment P3.7.4.1 investigates the orientation and polarization of the microwave field in front of a radiating horn antenna. Here, the field in front of the horn antenna is measured point by point in both the longitudinal and transverse directions using the E-field probe. To determine the polarization, a rotating polarization grating made of thin metal strips is used; in this apparatus, the electric field can only form perpendicular to the metal strips. The polarization grating is set up between the horn antenna and the E-field probe. This experiment shows that the electric field vector of the radiated microwaves is perpendicular to the long side of the horn radiator.