By E.V. Jull

ISBN-10: 0906048524

ISBN-13: 9780906048528

Replacement equipment of aperture antenna research are defined during this book.

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Extra resources for Aperture antennas and diffraction theory

Example text

1 is, from eqns. 21) Gn = -^-RE(u)RE(v) where with u = a/y/lrX and C(w) and S(u) defined by eqn. 8. The gain reduction factor RE(u) for a uniform line source was first tabulated by Polk (1956). Its behaviour is illustrated in Fig. 1, as functions of the parameter 2d21(U) where d is the aperture dimension a and 91 is the range r. As r -» °°, u -> 0, C(u) ^ w, 5(M) « u3 » 0 and##(«) -> 1; then eqn. 6. The near-field axial gain of a square aperture of side a with a uniform distribution is shown in Fig.

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. The measuring antenna is in the far field of the smaller aperture dimension but in the near field y j. Fig. 3 Arrangement for measurement of the 0 = n/2 plane radiation pattern of antenna T with antenna R of the larger and directed at the measured antenna.

1. This result is useful Applications of aperture theory to antennas 53 for large open-ended waveguides but is a crude approximation for waveguides supporting only the TEOi mode, for then \/2

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