Download e-book for iPad: Antenna Theory and Design, 2nd Edition by Warren L. Stutzman

By Warren L. Stutzman

ISBN-10: 0471025909

ISBN-13: 9780471025900

Hugely revered authors have reunited to replace the well-known 1981 version that is nonetheless hailed as the most effective in its box. This variation comprises fresh antenna options and functions. It incorporates a succinct remedy of the finite distinction, time area (FDTD) computational method. it's also the 1st textual content to regard actual thought of diffraction (PTD).

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Additional resources for Antenna Theory and Design, 2nd Edition

Sample text

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.

In general, use (1-58) with R = r in the magnitude factor and the parallel ray approximation of (1-96) for determining phase differences over the antenna. r' (1-102) v' For z-directed sources, j A = iJL e- /3r 41Tr III dv' v' For z-directed line sources on the z-axis, A -j(3r = iJL _e_ I 41Tr J(z')e j /3Z' cos 0 dz' (1-103) which is (1-87). 2. Find E. In general, use the component of E = -jwA (1-104) which is transverse to the direction of propagation r. This is expressed formally as E = -jwA - (-jwA.

This is appropriate since we are only interested in relative phase behavior. Pattern variation is, of course, independent of r. An element of current on the z-axis has a normalized field pattern from (1-72a) of j F(e) = (Il1z141T')jwJL(e- {3rlr) sin 6 = sin e (Jl1z141T')jwJL(e Jf3 r lr ) (1-113) and there is no c/J variation. The normalized field pattern for the uniform line source is from (1-111) in (1-112) F(6) = sin 6 sin[(,BLI2) cos 6] (f3L12) cos () (1-114) and again there is no c/J variation.

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


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