By Simon R. Saunders
An important resource of data for training and aspiring instant communique engineers, in addition to for college kids at postgraduate and senior undergraduate degrees. This booklet presents a primary grounding within the rules of antennas and propagation with no over the top recourse to arithmetic. It additionally equips the reader with useful prediction suggestions for the layout and research of a really wide variety of universal instant communique platforms.
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Extra info for Antennas and Propagation for Wireless Communication Systems
5% (eÀ2) given "r ¼ 3, r ¼ 2 and ¼ 100? 1(e) for the case when ¼ 10. 1(e), and use this to explain why the surfaces of copper conductors in high-frequency circuits are often gold-plated. 8 Compare the attenuation of a plane wave travelling 1 m through a non-magnetic medium with ¼ 10À4 S mÀ1 and "r ¼ 3 at 100 MHz, 1 GHz and 10 GHz. 9 Describe, in your own words, the physical meaning of Maxwell’s equations and why they are important for wireless communications. 10 A vertically polarised plane wave at 1900 MHz travels in the positive z direction in a medium with constitutive parameters r ¼ 1, "r ¼ 3 and ¼ 10 S mÀ1 .
C) Suggest a method for making a more efﬁcient use of the radio spectrum if the trafﬁc is variable in the three cells, as this trafﬁc tends to be bursty. 2 Properties of Electromagnetic Waves ‘I have no picture of this electromagnetic ﬁeld that is in any sense accurate. . I see some kind of vague, shadowy, wiggling lines. . So if you have some difﬁculty in making such a picture, you should not be worried that your difﬁculty is unusual’. Richard P. 1 INTRODUCTION Some of the key properties of electromagnetic waves travelling in free space and in other uniform media are introduced in this chapter.
2Z2 cos i sﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ 2 Z2 Z2 1 À sin2 i þ Z1 cos i Z1 2Z2 cos i sﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ 2 Z2 Z2 cos i þ Z1 1 À sin2 i Z1 ð3:15Þ ð3:16Þ Other useful relationships can be deduced by considering the conservation of energy at the point of incidence: since the power in the incident wave is divided between the reﬂected and transmitted waves, the following relationships hold: jTjj j2 ¼ 1 À jRjj j2 and jT? j2 ¼ 1 À jR? 4), because the phase velocity of the transmitted wave (and the attenuation constant) depends on the incidence angle as well as on the constitutive parameters.