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

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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### Aperture antennas and diffraction theory by E.V. Jull

by Anthony

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