Download e-book for iPad: Antennas - Fundamentals, Design, Measurement by Lamont V. Blake

By Lamont V. Blake

ISBN-10: 1613441479

ISBN-13: 9781613441473

ISBN-10: 1891121782

ISBN-13: 9781891121784

This complete 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 direction textbook, it really is well-suited for pro education and self-study by means of working towards engineers, scientists, and technologists who wish to extend their wisdom of antennas. The ebook offers a huge assurance 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, interpreting it doesn't require previous talents in electromagnetic concept, refined arithmetic, or desktop programming.

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Example text

1–8, if E1 = E2, it may be seen that g = a/2 = d. In addition, if E1 = E2, and by using a standard trigonometric formula, (1–26) becomes α E3 = E1 2 + 2 cos α = 2 E1 cos    2 (1–28) The specialization a = 0 results in E3 = E1 + E2, and specialization a = 180° gives E3 = E1 − E2, corresponding to the vector addition of parallel and antiparallel vectors. This type of complex vector addition of two electric intensities solves the superposition (interference) problem in which E1 and E2 have the same frequency and the same time phase but different directions in space at the point under consideration.

The magnetic field will vary, of course, if the current varies; therefore, with alternating current the magnetic field will be continuously varying and will therefore continuously generate an electric field. Because the two fields always exist together—one cannot exist without the other unless it is nonvarying—the combination is called the electromagnetic field. The time variations of the field components will be related to the nature of the variations of the current; if it is sinusoidal, the fields will vary sinusoidally at the same frequency.

This diffraction effect, observable with light waves under laboratory conditions, is also observable with radio waves under suitable conditions. It is an important effect in analyzing the performance of some types of antennas—those for which it is desired to radiate a very narrow “beam” of waves in a preferred direction and to minimize radiation in all other directions. Ideally, it would often be desirA' B' able to have absolutely no radiation in FIGURE 1–9. undesired directions; but this result is never perfectly achievable because of the Huygens’ principle applied to propagation of plane waves.

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

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