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

By Y.T. Lo, S.W Lee

ISBN-10: 0442015933

ISBN-13: 9780442015930

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

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Example text

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. The firstorder near-field effect is an additional quadratic phase difference in the radiation from the aperture. Thus for an x-polarized separable field in the aperture of Fig. 3, (68) where (69) (70) Radiation from Apertures 5-25 with {J = nlr). 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).

2 II = the input current to the terminals of antenna no. 1 one finds (29) This expression has been tested for two half-wave dipoles. The result shows that the expression is quite accurate where r, the distance between the two antennas, is greater than half of a wavelength. The formula could be used to estimate the coupling between antennas since the vector effective heights of most antennas can be calculated using some reasonable assumption of their current distributions or aperture field distribution.

159-168. T. T. Taylor, "Design of line-source antennas for narrow beamwidth and low side lobe levels," IRE Trans. , vol. AP-3, pp. 16-28, January 1955. R. C. , Microwave Scanning Antennas, Volume I, New York: Academic Press, 1964, pp. 419, 427. T. T. Taylor, "Design of circular apertures for narrow beamwidth and low side lobes," IRE Trans. , vol. AP-8, pp. 17-22, January 1960. R. C. Hansen, "Table of Taylor distributions for circular aperture antennas," IRE Trans. , vol. AP-8, pp. 23-26, January 1960.

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


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