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Antennas are engineered devices used to send and receive electromagnetic signals. Each antenna has a unique set of characteristics — frequency response, polarization, radiation pattern, etc. — which are set by its size and topology. It is important to know general characteristics of common antenna topologies in order to be able to choose the proper topology for any particular application. In this course, we will briefly introduce four common antenna topologies: horn antennas, Yagi-Uda antennas, slot antennas, and rectangular patch antennas. This course was developed by Kathryn Leigh Smith, assistant professor in the Department of Electrical and Computer Engineering at the University of North Carolina-Charlotte, in partnership with Ansys.