Microwaves

Download Antenna handbook by Y.T. Lo, S.W Lee PDF

By Y.T. Lo, S.W Lee

Lo Y., Lee S. Antenna guide (Van Nostrand Reinhold, 1993, 2)(ISBN 0442015933)

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And kJ and k2 defined by (26). As r ---+ 00, {J ---+ 0 and the Fresnel transforms (69) and (70) become the Fourier transforms (28) and (29). For a uniform distribution EJ(x) = 1, so where the Fresnel integra/s* C(u) and S(u) are defined by C(u) - jS(u) = fU e-i:Jrv~/2dv o (72) and have arguments U2} {UJ = For the cosinusoidal distribution E 2 (y) D 2(k 2) = a kJ = cos (nylb), so ± V2r). - 2n V2rI ! fi (e (r-t/4:Jr)(k2+:Jrlb)2{ C(V2) i (73) C(Vt) - j[S(V2) - S(Vt)]} + ei (rAl4:Jr)(k 2-:Jrlb)2{C(W2) - C(Wt) - j[S(W2) - S(Wt)]}) (74) where (75) The above expressions together give the near-field pattern of an open-ended rectangular waveguide and reduce to the far-field pattern expressions (38) and (39) as r ---+ 00.

The small transmitting antenna is never satisfactory from the standpoint of efficiency because much of the generated Antenna Theory 6-10 power is wasted in heating the ohmic resistance. On the other hand, small receiving antennas often are very satisfactory. Sensitivity rather than power efficiency is the important factor in reception, and sensitivity is limited by noise. Schelkunoff and Friis ([5], Chap. 10) are suggested for a complete discussion of small antennas. There are two types of small antennas: the short dipole and the small loop.

It is designated as the vector effective height function or simply the vector effective height. It is defined by N h=- (7) lin where lin denotes the input current to the antenna when it is. operating in its transmitting mode. * The dimension of h is measured in meters, hence it is identified as the "height" function. The function h, like the function N or A, is a function of the spherical angular variables (f), l/J) only, being independent of the radial variable r. A plot of Ihl yields the field pattern and that of Ihl 2 yields the power pattern.

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