1 Antennas
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku2 Source: Adapted with permission from M. Chryssomallis, “Smart Antennas,” IEEE Antennas and Propagation Magazine, vol. 42, no. 3, June 2000, pp. 129–136.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku3 Figure 13.1 An antenna as a matching device between the guiding structure and the surrounding medium.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku4 Figure 13.2 Typical antennas.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku5 Figure 13.3 A Hertzian dipole carrying current I I o cos t.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku6 Figure 13.4 (a) A half-wave dipole. (b) Geometry for calculating the fields.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku7 Figure 13.5 The monopole antenna.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku8 Figure 13.6 The small loop antenna.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku9 Figure 13.7 Field patterns of the Hertzian dipole: (a) normalized E-plane or vertical pattern ( constant 0), (b) normalized H-plane or horizontal pattern ( /2), (c) three-dimensional pattern.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku10 Figure 13.8 Power patterns of the Hertzian dipole: (a) constant 0, (b) constant /2.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku11 Figure 13.9 Relating P in, P ℓ, and P rad.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku12 Figure A two-element array.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku13 Figure An N-element uniform linear array.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku14 Figure Array factors for uniform linear arrays.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku15 Figure For part (a) of Example 13.6: field patterns in the plane containing the axes of the elements.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku16 Figure For part (b) of Example 13.6; field patterns in the plane containing the axes of the elements.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku17 Figure For Practice Exercise 13.6.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku18 Figure For Example 13.7: (a) a three-element array with current ratios 1: 2 : 1; (b) and (c) equivalent two-element arrays.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku19 Figure For Example 13.7; obtaining the resultant group pattern of the three-element array of Figure 13.16(a).
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku20 Figure For Example 13.7 and Practice Exercise 13.7: four-element array with current ratios 1: 3 : 3: 1.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku21 Figure For part (a) of Practice Exercise 13.7.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku22 Figure Thévenin equivalent of a receiving antenna.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku23 Figure Transmitting and receiving antennas in free space.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku24 Figure (a) Typical radar system. (b) Simplification of the system in (a) for calculating the target cross section .
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku25 Figure Typical examples of intersystem EMI problems. Source: J. I. N. Violette et al., Electromagnetic Compatibility Handbook. New York: Van Nostrand Reinhold, 1987, p. 4.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku26 Figure Differences between conducted and radiated emissions.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku27 Figure Short dipole antenna with triangular current distribution; for Problem 13.5.
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku28 Figure Two-element array of Problem
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku29 Figure For Problem
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku30 Figure For Problem
Copyright © 2007 Oxford University Press Elements of Electromagnetics Fourth Edition Sadiku31 Figure For Problem