Ant_meas_theoryAntenna Measurement TheoryIntroduction to Antenna Measurement1. Basic Concepts1.1 ELECTROMAGNETIC WAVES The radiation field from a transmitting antenna is characterized by the complex Poynting vector E x H* in which E is the electric field and H is the magnetic field. Close to the antenna the Poynting vector is imaginary (reactive) and (E,H) decay more rapidly than 1/r, while further away it is real (radiating) and (E,H) decay as 1/r . These two types of fields dominate in different regions in space around the antenna. Based on this characterization of the Poynting vector, we can identify three major regions (Figure 1).Figure 1: Radiating Regions1.1.1. Reactive Field This region is the space immediately surrounding the antenna. The extent of this region is 0 < r < λ/2π, where λ is ……
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