Section THE ELECTROMAGNETIC WAVE 1. General a. The study of antennas and wave propazation is essential to a complete understanding radio communication, radar, loran, and other e:ectronic systems. In such systems, energy in the form of radio or electromagnetic waves is generated by electronic equipment and fed to an anterna by means of special transmissicn lines. The antenna radiates this energy out into space at the speed of light (approximately 186,090 miles per second). Receiving antennas, when placed in the path of the traveling wave, absorb part of this energy ov A" sn So (EARTH'S TATMOSPHERE) at TRANSMITTING TRANSMISSION CINE TRANSMITTER Figure and send it to the receiving equipment by means of a transmission line.
DesignationTM 11-666
EditionJan 1953
StatusSuperseded
Pages231
FunctionComms Signal
CollectionHistoric
Public domain (U.S. Government work)