By Richard C. Johnson
Newly revised and up-to-date, this best-selling reference presents the fundamental ideas, tools, and information had to resolve the engineering difficulties that come up in antenna layout and alertness. An array of top specialists from RCA, Raytheon, Scientific-Atlantic, and different significant corporations makes it the main authoritative A-to-Z choice of cutting-edge details on hand. somebody concerned with antennas might be an keen patron for this up-to-date vintage. Technicians will use it to raised comprehend the antennas they paintings with. starting engineers will wish its descriptive fabric and layout facts. skilled engineers will use it as their fundamental resource of layout info. Senior engineers will use the instruction manual to wake up to hurry on new antennas and functions. And layout engineers will locate rules to resolve new and tough difficulties.
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3-4) in a different form such as 1 - cos nu sin2 (nu/2) ISuIZ = sus:= =: 1 - cos u sin2 ( 4 2 ) it is easy to see that the null positions (Su = 0) are givm by 3-2 UNIFORM LINEAR ARRAYS When the identical elements of a linear array are equally spaced along the array axis and excited with uniformly progressive phases as shown in Fig. 3-1, the array pattern 3-3 where 0,,02, . . , O M are the angular null positions on one side of the beam maximum in the forward direction and 8-,, 8-,, . . , 0-, are null positions on the other side of 34 Introduction and Fundamentals Arrays of Discrete Elements 3:5 the beam maximum, also in the forward direction.
The total radiation pattern is given by FIG. 2-23 Synthesis of cosecant pattern for E ( 0 ) = 0. + AMPLITUDE DISTRIBUTION and the corresponding normalized aperture distribution is given by where -1 5 x I$1. 0 and that it have no radiation for negative values of sin 4. For an aperture length of 10 wavelengths, sin 4 is divided into spaces one-tenth wide from - 1 to 1 and ordinates erected at each division with a height equal to E(+). For the problem at hand, E(4) is proportional to csc 4. A plot of the E(4) diagram is shown in Fig.
100, September 1953, pp. 303-314. G. , vol. 36, November 1948, pp. 1364-1370. G. Sinclair, E. C. Jordan, and E. W. , vol. 35, December 1947, pp. 1451-1462. Chapter 3 Arrays of Discrete Elements * Mark T. Ma National Institute of Standards and Technology Introduction 3-2 Uniform Linear Arrays 3-2 Broadside Arrays of Isotropic Elements 3-3 Broadside Arrays with Practical Antennas as Elements 3-7 Ordinary End-Fire Arrays of Isotropic Elements 3-10 Ordinary End-Fire Arrays of Practical Antennas as Elements 3-12 Yagi-Uda Arrays 3-13 Improved ~nd-FireArrays 3-15 Linear Arrays with Tapered Excitations-Equal Sidelobes 3-1 7 A New Approach for Treating Optimum Broadside and End-Fire Arrays 3-18 Optimum Broadside Arrays When d c X/2 3-24 optimum End-Fire Arrays When d Is Less Than the Maximum Allowable Spacing 3-26 Array of Arrays 3-29 'Contribution of the National Institute of Standards and Technology not subject to copyright.