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By Collin, Robert E.; Zucker, Francis J

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The receiving antenna at St. John’s was a 200-m wire pulled and supported by a kite. This was the dawn of the antenna era. From Marconi’s inception through the 1940s, antenna technology was primarily centered on wire related radiating elements and frequencies up to about UHF. It was not until World War II that modern antenna technology was launched and new elements (such as waveguide apertures, horns, reflectors) HISTORICAL ADVANCEMENT 19 were primarily introduced. Much of this work is captured in the book by Silver [14].

15(b), it can be assumed that the current distribution is essentially unaltered in form in each of the wires. However, because the two wires of the flared section are not necessarily close to each other, the fields radiated by one do not necessarily cancel those of the other. Therefore, ideally, there is a net radiation by the transmission-line system. 15(c). This is the geometry of the widely used dipole antenna. Because of the standing wave current pattern, it is also classified as a standing wave antenna (as contrasted to the traveling wave antennas which will be discussed in detail in Chapter 10).

J. D. Kraus, Electromagnetics, McGraw-Hill, New York, 1992, pp. 761–763. S. A. Schelkunoff and H. T. Friis, Antenna Theory and Practice, Wiley, New York, 1952. K. S. Yee, “Numerical Solution of Initial Boundary Value Problems Involving Maxwell’s Equations in Isotropic Media,” IEEE Trans. , Vol. AP-14, No. 3, pp. 302–307, May 1966. J. P. Berenger, “A Perfectly Matched Layer for the Absorption of Electromagnetic Waves,” J. Comput. , Vol. 114, pp. 185–200, October 1994. W. V. Andrew, C. A. Balanis, and P.

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