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The radio antenna may be defined as the interface between a circuit in which electrical power is constrained to follow conducting paths, and electromagnetic radiation travelling freely through space. The antenna may convert power in the circuit into radiated energy or vice versa, forming either a transmitting or receiving antenna respectively ...
Chapter 1: Introduction. In this chapter a brief history of antennas is presented. The source of electromagnetic radiation is discussed and the mechanism by which radiated fields emerge from an antenna is explained. A brief overview of the antenna types dis- cussed in this book is presented.
The third editionof Antenna Theory is designed to meet the needs of electrical engi- neering and physics students at the senior undergraduate and beginning graduate levels, and those of...
These lecture notes are heavily based on the book of Antenna Theory and Design by W.L. Stutzman and G. A. Thilie. For future version or any proposals, please contact with Dr. Serkan Aksoy (saksoy@gtu.edu.tr).
An antenna is a device that couples currents to electromagnetic waves for purposes of radiation or reception. The process by which antennas radiate can be easily understood in terms of the way in which accelerating charged particles or time-varying currents radiate, which is discussed in Section 10.1.
configuration. A chapter on antenna measurements introduces state-of-the-art methods used in the measurements of the most basic antenna characteristics (pattern, gain, directivity, radiation efficiency, impedance, current, and polarization) and updates progress made in antenna instrumentation, antenna range design, and.
Antennas are devices for radiating or receiving radio waves; but: •. Antennae are sensitive organs of insects. •. At GHz frequencies, a physical limitation for applications in wireless commu-nications is given by the atmospheric attenuation of electromagnetic waves due to water vapor and absorption by gases [9]; see Fig. 2.1.2.
