天線量測原理

gt119

【文件名】:0611@52RD_Antenna Measurement Theory.pdf
【简　介】:
【目　录】:
【格　式】:pdf
【大　小】:1168K





1. Basic Concepts

1.1 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).

dengf

ok ok ok