By F. Schwering, A. A. Oliner (auth.), Y. T. Lo, S. W. Lee (eds.)
Technology has complicated to one of these measure during the last decade that it's been nearly most unlikely to discover up to date insurance of antennas. Antenna guide, edited by means of of the world's so much exceptional antenna speciallists, provides the main complicated antenna concept and designs and demonstrates their software in a wide selection of technical fields. they provide a spectacular quantity of in-depth facts and research on quite a lot of themes, supported via formulation, curves, and effects, in addition to derivations.
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Additional info for Antenna Handbook: Volume III Applications
Fig. 20b shows the theoretical reflection coefficient for a linear, parabolic, and elliptic taper profile* as a function of the aspect ratio (b a)/h. 4Ao and excited in the lowest-order TM mode. For a short taper with (b - a)/h < 2, the reflection coefficient can be rather large; it is largest for the linear profile, which is understandable, since this profile produces a more abrupt transition at the base of the tapered section than does a parabolic or elliptic profile. For a long, gradual taper, on the other hand, which is the practically interesting case, the linear profile results in the lowest reflection coefficient.
A) Antennas of moderate length (3Ao to lOAo) tend to produce a comparatively broad main beam whose sides, however, drop down rapidly toward the first zero . A consequence is that the gain of these antennas is usually within the predicted range between the solid and dashed gain curves of Fig. 17, while the beamwidth may be slightly above the upper bound defined by the dashed beamwidth curve. (b) By careful design the side lobe level can be kept below -25 dB. As an example, Fig. 1 (Teflon).
This gain limitation is easy to understand on the basis of the equivalence principle. The polarization current in each volume element of the antenna radiates as a Hertz dipole. The phases of these dipoles are determined by the phase velocity, of the surface wave guided by the antenna. Since this phase velocity remains below the free-space wave velocity, the contributions 'The value p = 10 applies to maximum-gain antennas of moderate length L between 3}'0 and lUo. 17-40 Applications of the various volume elements of the antenna to the radiation in the forward direction will add constructively only up to a certain length of the antenna.
Antenna Handbook: Volume III Applications by F. Schwering, A. A. Oliner (auth.), Y. T. Lo, S. W. Lee (eds.)