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CHAPTER 2 RADIO WAVE PROPAGATION
Figure 2-2.Phase relationship of induction field components

Neets Module 10-Introduction to Wave Propagation, Transmission Lines, and Antennas
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2-2 ELECTROMAGNETIC FIELDS The way energy is propagated into free space is a source of great dispute among people concerned with it. Although many theories have been proposed, the following theory adequately explains the phenomena and has been widely accepted. There are two basic fields associated with every antenna; an INDUCTION FIELD and a RADIATION FIELD. The field associated with the energy stored in the antenna is the induction field. This field is said to provide no part in the transmission of electromagnetic energy through free space. However, without the presence of the induction field, there would be no energy radiated. INDUCTION FIELD Figure 2-1, a low-frequency generator connected to an antenna, will help you understand how the induction field is produced. Let's follow the generator through one cycle of operation. Figure 2-1.—Induction field about an antenna.






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