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By Hubregt J. Visser

ISBN-10: 1119944740

ISBN-13: 9781119944744

ISBN-10: 1119944759

ISBN-13: 9781119944751

ISBN-10: 1119990254

ISBN-13: 9781119990253

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 Read more...

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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 [3]. 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.

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Antenna theory and applications by Hubregt J. Visser


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