By Hubregt J. Visser
This complete textual content on antenna thought explains the starting place of radiation and discusses antenna parameters in-depthThis ebook bargains an in-depth insurance of primary antenna thought, and indicates the right way to follow this in perform. the writer discusses electromagnetic radiation and antenna features equivalent to impedance, radiation trend, polarization, achieve and potency. moreover, the publication presents readers with the required instruments for examining advanced antennas and for designing new ones. in addition, a refresher bankruptcy on vector algebra, together with gradient, divergence and curl operation is integrated. through the e-book abundant examples of making use of the derived thought are given and all chapters are concluded with difficulties, giving the reader the chance to check his/her bought knowledge. Read more...
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Additional resources for Antenna theory and applications
13. 9 Alternative three-dimensional electric ﬁeld radiation pattern of a half-wave dipole antenna. 10 Alternative three-dimensional electric ﬁeld radiation pattern of a hypothetical pyramidal horn antenna. 9. Whether a polar or a rectangular plot of the radiation pattern is used, is mainly a matter of taste. The author’s taste is for rectangular patterns, especially for observing details, and for power patterns over ﬁeld patterns. 4 Power Patterns The radiation patterns shown thus far have been so-called ﬁeld patterns.
10 Alternative three-dimensional electric ﬁeld radiation pattern of a hypothetical pyramidal horn antenna. 9. Whether a polar or a rectangular plot of the radiation pattern is used, is mainly a matter of taste. The author’s taste is for rectangular patterns, especially for observing details, and for power patterns over ﬁeld patterns. 4 Power Patterns The radiation patterns shown thus far have been so-called ﬁeld patterns. In general, we are not directly interested in the angular electric ﬁeld amplitude distribution, but more in the angular power distribution.
The accepted power) is distributed in space. The gain, G, is the maximum of the gain function, G = max[G(ϑ, ϕ)]. 12) The quotient of gain and directivity equals the quotient of total radiated power and total accepted power and is called the radiation efﬁciency, η . η= G Pt = . 13) The efﬁciency is smaller than one due to ohmic and/or dielectric losses in the antenna. 6 Antenna Beamwidth In comparing antennas we may use the gain we just discussed. But this is a number that only tells us about the maximum radiation.
Antenna theory and applications by Hubregt J. Visser