Download PDF by E.V. Jull: Aperture antennas and diffraction theory

By E.V. Jull

ISBN-10: 0906048524

ISBN-13: 9780906048528

Substitute tools of aperture antenna research are defined during this book.

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Hence complex amplitudes an for n running from —kb/2 to kb/2, or kb + 1 in all, are required. The same minimum number of equally spaced observation points about the aperture are also needed. The measuring antenna will have some directivity. e. 27) 40 Near-field radiation patterns If the pattern of the receiving antenna pattern is assumed to be of the form of eqn. 28) where K is given by eqn. 15. 30) an = 2nexp(-K)H

1978). If the antenna can be rotated measurements over a cylindrical or spherical surface may be more convenient. The amplitude phase and polarisation of the field on the surface of a circular cylinder axial to the antennas rotation will provide the lateral and rear, as well as the forward, patterns (Leach and Paris, 1973). For highly directive antennas, a combination of planar and cylindrical scanning may be used. Measurements over a spherical surface surrounding the antenna can in principle provide the complete pattern most efficiently (Wacker, 1975).

36 has no Ey component and the received field of eqn. 12 rejects the Ey component of incident field. No approximations were made in deriving eqn. 12 but its evaluation is in general very difficult. In the far field, kr > 1, integration by stationary phase is possible, yielding for = n/2. 13) which is independent of the radiation pattern of the receiving antenna. A near-field evaluation of eqn. 12 can be made for antennas large in the bdimension of Fig. 1 but relatively small in the ^-dimension.

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Aperture antennas and diffraction theory by E.V. Jull


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