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

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By Y.T. Lo, S.W Lee

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

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7Ula) 1. ;1\ -0/2 0 0/2 • p' H-PLANE PATTERN OF TEll MODE a:' [11 (3. / 0 . 0 \ 1', /0 ....... ~h-qM ~ ~ "" ~ ..... 4 ,I 0 - ----. 0 c Fig. 10. Half-power beamwidths of compound symmetrical distributions in a circular aperture. n = 2 in the above expressions are plotted in Fig. 10 for various values of C. Data for the design of optimum pattern distributions in circular apertures is also available [11,12]. , the distance is very large compared with the aperture dimensions. There are linear phase differences in the radiation reaching the field point from different parts of the aperture.

Collin and F. J. , 1969, pp. 62-74. D. R. Rhodes, Synthesis of Planar Antenna Sources, Oxford: Oxford University Press, 1974, pp. 9-42. E. V. , England: Peter Peregrinus, 1981, pp. 7-17. W. L. Stutzman and G. A. Thiele, Antenna Theory and Design, New York: John Wiley & Sons, 1981, pp. 375-384. C. A. Balanis, Antenna Theory: Analysis and Design, New York: Harper and Row, 1982, pp. 446-456. S. , 1946, pp. 159-168. T. T. Taylor, "Design of line-source antennas for narrow beamwidth and low side lobe levels," IRE Trans.

The half-power beamwidth of the ideal pattern (50) is slightly smaller and given precisely by (58) with a = 1. In the numerical example of Fig. 78) and the pattern nulls are those of (sinu)lu for u > 5n 5). 96. m= = = Circular Apertures For a circular aperture of diameter a as in Fig. 'sin8cos(tIJ-tlJ') e' de' dtP' (59) 5-21 Radiation from Apertures x y Fig. 8. Coordinates for radiation from a circular aperture. where • -jkr A= J~Ar (1 + cosO)(9cosq, - ej,sinq,) (60) for an aperture not in a conducting plane and je- jkr A = 2Ar (6cosq, - ~cosOsinq,) A A (61) for a conducting plane in z = 0, e' > a/2.

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