Get Antenna Theory and Design, 2nd Edition PDF

By Warren L. Stutzman

ISBN-10: 0471025909

ISBN-13: 9780471025900

Hugely revered authors have reunited to replace the well-known 1981 variation that is nonetheless hailed as the best in its box. This variation contains fresh antenna concepts and functions. It contains a succinct therapy of the finite distinction, time area (FDTD) computational procedure. it's also the 1st textual content to regard actual concept of diffraction (PTD).

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Extra info for Antenna Theory and Design, 2nd Edition

Sample text

It has a maximum value of unity at u = 0; this corresponds to 6 = 90°, where u = (,BLl2) cos 6. Substituting 6 = 90° in (1-114) gives unity and we see that F(6) is properly normalized. In general, a normalized field pattern can be written as the product I F(6, c/J) = gee, c/J )f(6, c/J) I (1-115) where g(6, c/J) is the element factor and f(6, c/J) the pattern factor. The pattern factor comes from the integral over the current and is strictly due to the distribution of current in space. The element factor is the pattern of an infinitesimal current element in the current distribution.

Note that a factor of! is present because current IA is the peak value in the time waveform. Separating the dissipated power into radiative and ohmic losses gives Pin = P + Pohmic (1-167) where we define the radiation resistance of an antenna referred to the input terminals as 2P Rr = (1-168) IIAI2 It follows from (1-167) that (1-169) where R ohmic is resistance associated with ohmic losses that include the directly driven part of the antenna as well as losses in other portions of the antenna structure such as a ground plane.

5-2), we have for the point source solution: (1-55) . This is the solution to (1-52) and is the magnitude and phase variation with distance r away from a point source located at the origin. If the source were positioned at an arbitrary location, we must compute the distance R between the source location and observation point P (see Fig. 1-8). Then (1-56) The point source solution is actually that of an ideal dipole and will be discussed more fully in the next section. For an arbitrary z-directed current density, the vector potential is also z-directed.

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Antenna Theory and Design, 2nd Edition by Warren L. Stutzman


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