By Simon R. Saunders
An essential resource of data for training and aspiring instant communique engineers, in addition to for college students at postgraduate and senior undergraduate degrees. This e-book offers a primary grounding within the ideas of antennas and propagation with no over the top recourse to arithmetic. It additionally equips the reader with functional prediction recommendations for the layout and research of a truly wide variety of universal instant conversation platforms.
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Additional info for Antennas and Propagation for Wireless Communication Systems
1 INTRODUCTION In Chapter 2, the media in which waves were propagating consisted of regions within which the constitutive parameters did not vary in space, being inﬁnite in extent in all directions. ). These boundary effects give rise to changes in the amplitude, phase and direction of propagating waves. Almost all these effects can be understood in terms of combinations of simple mechanisms operating on plane waves. These propagation mechanisms are now described and will later be used to analyse wave propagation in the real world.
Wavelength l [m] 2 k 2 % pﬃﬃﬃﬃﬃﬃ ! " Phase velocity v [m sÀ1] ! k 1 % pﬃﬃﬃﬃﬃﬃ " Wave number k [mÀ1] pﬃﬃﬃﬃﬃﬃ % ! sﬃﬃﬃﬃﬃﬃ 2! 1 A linearly polarised plane wave at 900 MHz travels in the positive z direction in a medium with constitutive parameters r ¼ 1; "r ¼ 3 and ¼ 0:01 S mÀ1. The electric ﬁeld magnitude at z ¼ 0 is 1 V mÀ1. 5 m2 area perpendicular to the direction of propagation at z ¼ 0; (d) the time taken for the wave to travel through 10 cm; (e) the distance travelled by the wave before its ﬁeld strength drops to one tenth of its value at z ¼ 0.
18: Edholm’s law of bandwidth (Reproduced by permission of IEEE, ß 2004 IEEE) fundamental properties of electromagnetic waves travelling in uniform media. These are developed in Chapter 3 in order to describe the basic mechanisms of propagation which occur when waves encounter boundaries between different media. Chapter 4 then shows how such waves can be launched and received using antennas, which have certain key requirements and properties and for which there are a number of generic types. Starting a new section, Chapter 5 introduces the concept of a propagation model, together with the basic techniques for analysing communication systems; these must be understood in order to predict system performance.
Antennas and Propagation for Wireless Communication Systems by Simon R. Saunders