02.Antennas and Propagation by John G. Webster (Editor)

By John G. Webster (Editor)

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The array beam width is therefore constant in (u, v) space for any given azimuth angle φ, but in terms of the θ dependence, the beam width broadens as the array is scanned from zenith (θ = 0) to the horizon. For a large array and scan angle θ 0 not too near the horizon, this beam width is given in terms of the beam width θ B at broadside as The beam width along the scan plane θ thus broadens like sec θ 0 as the array is scanned in θ. Accompanying this beam width increase is a decrease in array directivity so that the directivity is given in terms of the broadside directivity DB as ARRAY SYNTHESIS Many useful pattern synthesis techniques for planar or linear antenna arrays follow directly from existing methods developed for aperture or continuous one-dimensional antennas.

B) Microstrip line—quasi-TEM mode. (c) Slotline—non-TEM mode. • losses • working frequency limitations Several antenna accessories are manufactured for planar technology. Examples are directional couplers, hybrid rings, power dividers, and impedance matchers (11,12). These components are used as matching, feeding, and sampling networks in antenna systems. The effect of the electromagnetic coupling between two parallel transmission lines (sufficiently near each other) constitutes the design framework of several microwave devices (especially for antennas).

Figure 10(a–b) shows the array factors for 32 element arrays with 30 dB Taylor and Bayliss distributions. Note that the first sidelobe in both cases is very close to −30 dB with respect to the pattern maximum. In general, the discretizing of continuous distributions introduces errors in the synthesized pattern, and these are more significant for small arrays or for arrays that are forced to have very low sidelobes. Space precludes giving a detailed description of these procedures, but they are described in detail in a number of references.

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