Download Antennas - Fundamentals, Design, Measurement by Lamont V. Blake PDF

By Lamont V. Blake

ISBN-10: 1613441479

ISBN-13: 9781613441473

ISBN-10: 1891121782

ISBN-13: 9781891121784

This entire revision is a senior undergraduate or first-year graduate point textbook on antenna basics, layout, functionality research, and measurements. as well as its use as a proper path textbook, it truly is well-suited for pro education and self-study via training engineers, scientists, and technologists who wish to extend their wisdom of antennas. The booklet presents a large insurance of antenna kinds and phenomena, for operations at very low radio frequencies, in addition to frequencies as much as these of submillimeter wavelengths. not like so much university-level antenna textbooks, analyzing it doesn't require past abilities in electromagnetic concept, subtle arithmetic, or machine programming.

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1–10). Consequently, it “casts a shadow,” as illustrated in Fig. 1–12. Thus, Shadow Earth region it is apparent that radio waves traveling in a straight line from the antenna cannot penetrate the shadow region. There will FIGURE 1–12. be some diffraction into the shadow Radio-horizon effect and earth’s shadow. 32 Electromagnetic Waves region, but ordinarily the field strength from this effect is too small to be of practical value for radio communication. Thus, “line-of-sight” radio propagation from an antenna of height h, Fig.

Diffuse reflection, therefore, is expressible only in terms of a power reflection coefficient, Rd. Surfaces may also be semi-rough. For such surfaces the degree of roughness is not sufficient to destroy the shape of the reflected wavefront completely; there is a mixture of diffuse reflection and specular reflection. In such cases a total power reflection coefficient, R, may be expressed in terms of the diffuse-power-reflection coefficient, Rd, and the specular-reflection coefficient |G |. Since the total reflected power must be the sum of the diffuse and specular components, the relation for R is R = Rd + |G |2 (1–24) When the incident wave is reflected partly specularly and partly diffusely and is also partly transmitted, R may be substituted for |G |2 in (1–23).

These effects are refraction, reflection, interference, and diffraction. The first two can be explained basically in terms of rays and wavefronts, the principles of geometric optics. The second two, however, can be explained only in terms of physical optics, which requires a more detailed consideration of the electric and magnetic fields. Geometric optics may be applied when the dimensions of all the significant elements of the situation are large compared with the wavelength and when no wavelength-dependent effects are involved; otherwise the problem comes within the purview of physical optics or, more generally, electromagnetic theory.

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Antennas - Fundamentals, Design, Measurement by Lamont V. Blake


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