By Lamont V. Blake
This accomplished 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 really is well-suited for pro education and self-study by means of training engineers, scientists, and technologists who wish to extend their wisdom of antennas. The booklet presents a wide insurance of antenna forms and phenomena, for operations at very low radio frequencies, in addition to frequencies as much as these of submillimeter wavelengths. not like such a lot university-level antenna textbooks, analyzing it doesn't require earlier abilities in electromagnetic idea, subtle arithmetic, or computing device programming.
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Extra info for Antennas - Fundamentals, Design, Measurement
The fraction of the total incident power transmitted through the surface (refracted) is expressed by the power transmission coefﬁcient T (usually called the transmission coefﬁcient). Since the Law of Conservation of Energy requires that the total of the reﬂected and transmitted power shall equal the incident power, it is readily deduced that 20 Electromagnetic Waves 2 G +T =1 (1–23) Note that T does not allow computing the electric intensity or power density of the transmitted wave. It expressed a relationship between the total power incident on and transmitted through the surface, just as |G |2 expresses a similar relationship for the incident and reﬂected power.
However, at the low frequencies of a-c power circuits—60 Hz—and even at “audio” frequencies, the dimensions of any ordinary circuit will be such that these assumptions are correct. A wavelength in free space at 60 Hz, for example, is 5,000 km! Consequently, radiation is negligible, and is neglected in low-frequency a-c circuit theory. But at radio frequencies it is entirely feasible to make the distances d1 and d2 appreciable compared with a wavelength, and it is also easily possible to produce phase shifts of the currents in opposite legs of the circuit.
When a wavefront encounters an obstacle or discontinuity that is not large compared to the wavelength, the simple principles of geometric optics cannot be used to analyze the result. The correct analysis is obtained by application of Maxwell’s equations, which are the basis of electromagnetic theory. Huygens’ principle, deducible from Maxwell’s equations, is helpful in solving many problems of this type. According to the principle, every point on a given wavefront may be regarded as a radiating source, from which a spherical wavelet is propagated.
Antennas - Fundamentals, Design, Measurement by Lamont V. Blake