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Antennas: Characteristics and Applications
This lecture covers the basic characteristics of antennas, different families of antennas, their system aspects, and the application of Maxwell's equations to antennas. It also discusses the reciprocity of antennas, wave propagation in free space, and the frequency and spatial characteristics of antennas. The instructor explains the directivity of antennas, the omnidirectional and directional properties at different frequencies, and the opening angle of specific antennas. Additionally, the lecture delves into the relationship between the shape and materials of antennas, as well as the impact of electromagnetic waves on antennas and the ionosphere.