Download Antenna Engineering Handbook by Richard C. Johnson PDF

By Richard C. Johnson

Newly revised and up-to-date, this best-selling reference offers the fundamental rules, equipment, and information had to remedy the engineering difficulties that come up in antenna layout and alertness. An array of major specialists from RCA, Raytheon, Scientific-Atlantic, and different significant companies makes it the main authoritative A-to-Z choice of cutting-edge info to be had. someone concerned with antennas can be an keen consumer 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 basic resource of layout information. Senior engineers will use the instruction manual 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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In applying this technique, a rectangular or elliptical section of a full para- - boloid is used as the reflector surface. the area of the aperture. The value of gain obtained from this expression normally represents an upper limit which can be realized with practical structures. 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.

The sccond method is to measure the amplitude and phase of the field distribution across the aperture. From these data, the effect of the errors on the antenna performance can be computed. A third method is to compute the effect of manufacturing tolerances on the desired aperture distribution and from this, in turn, to compute the effect on the radiating properties of the antenna. This method is of considerable interest to the antenna designer, who must specify what sort of tolerances are necessary to achieve a desired result.

Thus, the actual value for the element spacing is usually a compromise of the above considerations. Broadside Arrays with Practical Antennas as Elements Broadside arrays with practical antennas may be achieved by placing the antenna elements in such a way that the maximum radiation of the element coincides with the desired broadside direction of the array. 4 There are, of course, many other arrangements that satisfy the requirement. We consider only the specific example mentioned above. Arrays of Half-Wave or Short Dipoles The particular arrangement is shown in Fig.

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