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An antenna can be defined in the following different ways: 1. An antenna may be a piece of conducting material in the form of a wire, rod or any other shape with excitation. 2. An antenna is a source or radiator of electromagnetic waves. 3. An antenna is a sensor of electromagnetic waves. 4. An antenna is a transducer. 5.
The Basics. Ward Silver NØAX. Antennas radiate (or receive) because electrons are accelerated (or are caused to accelerate) in the antenna’s elements. Radio or electromagnetic waves are both an E- (electric) and H- (magnetic) field. Electrons move parallel to E-fields. Strongest radiation from accelerating electrons linearly (back and forth)
Antenna Basics. 2–1 INTRODUCTION. Welcome to the wonderful world of antennas, its language and culture; to the aperture family (effective and scattering), the lobe family (main, side, back, and grating); to beamwidths, directivity, and gain.
Basic Antennas is a comprehensive introduction to antennas—basic concepts, practical designs, and details of easy-to-build antennas. You’ll learn how to make antennas that really work! This book will provide a foundation in antenna theory and design necessary for anyone under-taking more advanced topics.
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.
This book attempts to deal with the basic concepts relevant to receiving and transmitting antennas in a manner which emphasises the mechanisms involved and minimises the mathematics used. The bibliography provided offers the next stage of reading and understanding, while the outline set of original papers
Antennas are used for converting conducted electromagnetic waves into electromagnetic waves freely propagating in space and vice versa (Fig. 1.1). The name is derived from the field of zoology, where the term antennae (Latin) is used to designate the long thin feelers of insects.
