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Antenna Handbook: Special Topics de Y.T. Lo

Antenna Handbook: Special Topics

Autor Y.T. Lo, S. W. Lee
en Limba Engleză Hardback – 30 oct 1993
Technology has advanced to such a degree over the last decade that it has been almost impossible to find up-to-date coverage of antennas. Antenna Handbook, edited by two of the world's most distinguished antenna specialists, presents the most advanced antenna theory and designs and demonstrates their applicationin a wide variety of technical fields. They offer a stagering amount of in-depth data and analysis on a wide range of topics, supported by formulas, curves, and results, as well as derivations.
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Specificații

ISBN-13: 9780442015961
ISBN-10: 0442015968
Pagini: 402
Ilustrații: X, 402 p.
Dimensiuni: 156 x 234 x 30 mm
Greutate: 0.78 kg
Ediția:1994
Editura: Springer Us
Colecția Springer
Locul publicării:New York, NY, United States

Public țintă

Research

Cuprins

Transmission lines and waveguides; Propagation; Antenna response to electromagnetic pulses; Random electromagnetic design; Measurement of antenna radiation characteristics on far-field ranges; Near-field far-field antenna measurements; Appendices; Index

Descriere

Descriere de la o altă ediție sau format:
Techniques based on the method of modal expansions, the Rayleigh-Stevenson expansion in inverse powers of the wavelength, and also the method of moments solution of integral equations are essentially restricted to the analysis of electromagnetic radiating structures which are small in terms of the wavelength. It therefore becomes necessary to employ approximations based on "high-frequency techniques" for performing an efficient analysis of electromagnetic radiating systems that are large in terms of the wavelength. One of the most versatile and useful high-frequency techniques is the geometrical theory of diffraction (GTD), which was developed around 1951 by J. B. Keller [1,2,3]. A class of diffracted rays are introduced systematically in the GTD via a generalization of the concepts of classical geometrical optics (GO). According to the GTD these diffracted rays exist in addition to the usual incident, reflected, and transmitted rays of GO. The diffracted rays in the GTD originate from certain "localized" regions on the surface of a radiating structure, such as at discontinuities in the geometrical and electrical properties of a surface, and at points of grazing incidence on a smooth convex surface as illustrated in Fig. 1. In particular, the diffracted rays can enter into the GO shadow as well as the lit regions. Consequently, the diffracted rays entirely account for the fields in the shadow region where the GO rays cannot exist.