By Warren L. Stutzman, Gary A. Thiele
Stutzman's third variation of Antenna idea and Design presents a extra pedagogical technique with a better emphasis on computational tools. New positive factors contain extra smooth fabric to make the textual content extra interesting and proper to working towards engineers; new chapters on structures, low-profile components and base station antennas; organizational adjustments to enhance knowing; extra information to chose vital subject matters reminiscent of microstrip antennas and arrays; and multiplied measurements topic.
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Additional info for Antenna Theory and Design (3rd Edition)
This is the complex scalar wave equation or Helmholtz equation. Because of spherical symmetry, the Laplacian is written in spherical coordinates and ψ has only radial dependence. The two solutions to (2-57) are eÀjβr=r and eþjβr=r. These correspond to waves propagating radially outward and inward, respectively. The physically meaningful solution is the one for waves traveling away from the point source. Evaluating the constant of proportionality (see Prob. 2 Solution of Maxwell’s Equations for Radiation Problems 31 This is the solution to (2-55) and is the magnitude and phase variation with distance r away from a point source located at the origin.
3. E. , London, 1977. 4. Isaac Asimov, Asimov’s Biographical Encyclopedia of Science and Technology, revised 2nd edition, Doubleday, Garden City, New York, 1982. 5. Jack Ramsay, “Highlights of Antenna History,” IEEE Ant. & Prop. Soc. Newsletter, pp. 8–20, Dec. 1981. (Reprinted from IEEE Communications Magazine, Sept. ) 6. A. D. Olver, “A Century of Antenna Development,” IEE Conference Publication No. 274, Vol. I, 1987. 7. L. Campbell and W. Garnett, The Life of James Clerk Maxwell, 1882. com. 8.
C01 7 April 2012; 13:2:26 20 Chapter 1 Introduction Table 1-4 Types of Antennas Electrically Small Antennas: The extent of the antenna structure is much less than a wavelength λ. Properties: Low directivity Low input resistance High input reactance Low radiation efficiency Examples: Short dipole Small loop << λ << λ Resonant Antennas: The antenna operates well at a single or selected narrow frequency bands. Properties: Low to moderate gain Real input impedance Narrow bandwidth Examples: Half-wave dipole Microstrip patch Yagi ~ ~ λ 2 ~ λ 2 λ 2 Broadband Antennas: The pattern, gain, and impedance remain acceptable and are nearly constant over a wide frequency range.
Antenna Theory and Design (3rd Edition) by Warren L. Stutzman, Gary A. Thiele