2.1. Near-Field and Far-Field¶
Far-field and near-field describe fields around any electromagnetic source such as antennas. Therefore, two regions and a boundary between them exist around an antenna. Sometimes near-field is divided into two sub-regions. These two- and three-region models are shown Fig. 2.1. Furthermore, various far field definitions can be found in the literature depending on the application area. Fig. 2.2 shows the definitions of near- and far-field boundary. A good discussion about near- and far-field definitions can be read in .