By Richard C. Johnson
Newly revised and up-to-date, this best-selling reference presents the basic ideas, tools, and knowledge had to clear up the engineering difficulties that come up in antenna layout and alertness. An array of top specialists from RCA, Raytheon, Scientific-Atlantic, and different significant enterprises makes it the main authoritative A-to-Z choice of state of the art details on hand. a person concerned with antennas might be an keen consumer for this up-to-date vintage. Technicians will use it to higher comprehend the antennas they paintings with. starting engineers will wish its descriptive fabric and layout information. skilled engineers will use it as their fundamental resource of layout facts. Senior engineers will use the guide to wake up to hurry on new antennas and functions. And layout engineers will locate principles to resolve new and tough difficulties.
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Extra resources for Antenna Engineering Handbook
App. , vol. 19, December 1948, p. 1163. P. M. Woodward and J. D. Lawson, "The Theoretical Precision with Which an Arbitrary Radiation Pattern May Be Obtained from a Source of Finite Size," IEE J. (London),part 111, vol. 95, septemb& 1948, pp. 363-370. N. Yaru. , vol. 39, September 1951, pp. 10811085. A. Block, R. G. Medhurst, and S. D. Pool, "A New Approach to the Design of Superdirective Aerial Arrays," IEE J. (London),part 111, vol. 100, September 1953, pp. 303-314. G. , vol. 36, November 1948, pp.
Certain classes of aperture distributions offer the theoretical possibility of higher values of directivity than can be obtained with uniform distribution. In general, these theoretical distributions are characterized by reversals of phase over a distance short compared with the wavelength. One common feature of these superdirective distributions is the large amount of stored energy in the aperture region since very high values of field intensity are necessary to produce the same radiated field as would be produced by a uniformly- illuminated aperture with much lower values of field Intensity.
A second method of approximating the desired radiation pattern is one that enables the pattern to be specified exactly at a fixed number of points. This method, which was independently proposed by W~odward'~ and by Levinson, is panicularly appealing in that it gives the designer some physical insight into the way in which the pattern is synthesized and in addition allows some control of the pattern at points of discontinuity. ~ a s i c a l l the ~ , method consists of superposing a series of uniform-amplitude, linear-phase distributions across the aperture in such a way that the sum of the patterns produced by each of the distributions adds up to the desired pattern.