By Lamont V. Blake
It is a specialist point, introductory textual content on antenna ideas, layout, research, and measurements. it truly is specifically appropriate for people who desire to enhance their wisdom of antenna rules, idea layout, functionality analyses, and measurements. it's not a cookbook-like catalog for antenna layout, nor does its knowing require a familiarity with electromagnetic conception, subtle arithmetic, or complicated desktop suggestions. The third version updates and expands the unique textual content by way of Lamont Blake, which used to be ready on the undergraduate engineering, technological know-how, or expertise point. For delivering technical intensity on the senior and graduate college degrees, additions to the unique e-book contain a drastically accelerated bankruptcy 7 on Antennas with specified houses, a new bankruptcy eight on Electronically suggested Arrays, and a revised bankruptcy nine on Measurements. additionally new to this version are various appendices to the up-to-date textual content and a CD-ROM with pattern machine analyses. Reader wisdom assumes familiarity with uncomplicated university physics and arithmetic. desktop computations use Mathcad® software program, which are learn and utilized by folks with no previous machine programming wisdom. The booklet is for that reason compatible for entry-level in addition to the more matured execs who wish to extend their realizing of and services for antenna rules, analyses, measurements, and layout
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Additional resources for Antennas: Fundamentals, Design, Measurement
Attenuation due to the spherical spreading of the wave—that is, as expressed by the inverse-square law—is sometimes called the space attenuation of the wave. As can be shown from (1–6) or (1–11) by applying the deﬁnition of the decibel, the space Characteristics of Electromagnetic Waves 13 attenuation in decibels is twenty times the logarithm of the distance ratio. 5 dB; if the distance is increased by a factor of 10, the attenuation is 20 dB; and so on. Since it is the distance ratio rather than the actual distance change that determines the space attenuation, a given distance change has a greater effect at points close to a source than it has far from the source.
The practical successes of this theory place it among the most impressive of man’s scientiﬁc achievements. 28 Electromagnetic Waves Equations (1–2) and (1–3) are solutions of Maxwell’s equations for the simplest situation, that of a wave in free space at a great distance from the radiating source—in short, a plane wave. Equations 1–2 and 1–3 give no information on how radiation occurs, but Maxwell’s equations do give this information. They state that whenever electric current ﬂows, a magnetic ﬁeld is set up in the surrounding space.
When the reﬂecting surface is curved rather than plane, the curvature of the reﬂected wave is different from that of the incident wave; however, when a curved wavefront is reﬂected from a plane surface, the curvature of the reﬂected wave is the same as that of the incident wave. Plane and curved metallic reﬂecting surfaces have important applications in the design of high-frequency antennas. Reﬂection may also occur from a surface that is irregular or rough rather than smooth. Such a surface may destroy the shape of the wavefront.