By Richard C. Johnson
Newly revised and up-to-date, this best-selling reference presents the basic rules, equipment, and knowledge had to resolve the engineering difficulties that come up in antenna layout and alertness. An array of best specialists from RCA, Raytheon, Scientific-Atlantic, and different significant companies makes it the main authoritative A-to-Z choice of cutting-edge info on hand. somebody concerned with antennas might be an keen purchaser 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 information. Senior engineers will use the guide to wake up to hurry on new antennas and purposes. And layout engineers will locate rules to unravel new and hard difficulties.
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Extra resources for Antenna Engineering Handbook
As a check on the above theory, Ruze has computed the actual pattern of the 25-element antennas with a specific set of error currents. 40-rms error in each element with random phase, the radiation pattern was computed. Figure 2-17 shows the theoretical patterns for the cases with and without error. Analysis of the sidelobe magnitudes on this figure shows that their distribution compares very well with the theoretical distribution obtained on a statistical basis. 8 84 percent of the sidelobe levels will be less than the tabulated value.
For very large arrays, 8-1 is small, yielding 7 By comparing Eqs. (3-26) and (3-8), we conclude that the first-null beamwidth for the ordinary end-fire array is always wider than that for the broadside array with the same n and d/h. Half-Power Beamwidth Equation (3-9) is still valid for determining the halfpower point uh (taking the smallest negative solution), which in turn gives The half-power beamwidth thus becomes Sample results for (BW) for the uniform ordinary end-fire array are given in Fig.
Arrays of Half-Wave or Short Dipoles The particular arrangement is shown in Fig. 3-3. Although the current distribution on two or more antennas in an array environment is not the same as when the elements are isolated because of the influence of 3-8 Pdd Arrays of Discrete Elements Introduction and Fundamentals , FIG. 3-3 An equally spaced linear array of collinear dipoles. mutual couplings, the mutual impedance of collinear dipoles is, however, relatively small, and therefore the change in current distribution is not large.
Antenna Engineering Handbook by Richard C. Johnson