Aperture antennas and diffraction theory by E.V. Jull

Aperture antennas and diffraction theory by E.V. Jull

By E.V. Jull

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

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3. The method is valid at all ranges which encompass the measured antenna, provided interaction between probe and measured antenna is negligible, an effect not accounted for in any of the techniques proposed for determining the far-field pattern from near-field measurements. 1 T 1 / / dB / / II -20 - ~I \ h 7V j -30 -12 • -4 /--\ \ / \\ \\'\ f \ f \\ A \ | ff y f i -2 e Fig. 6 / 1/ Hf 4I •' I'\ 1/ f \ \\ M V M/ ll/ iy 1 1 1; II U 0 4 8 \ \\ i i i > 12 (degrees) Far-field patterns of a 3-2 cm slotted waveguide array measured calculated from amplitude and phase measurements at a range r — 0-01 b21\ (see Fig.

Only a few terms in the series of eqn. 16 are needed. For large BR the series reduces to that of eqn. 11. 1 1 (a) \ •V (/> - 2 0 CO O LJ O -30 -40 - -50 Fig. 4 1Vv . ii ,i 10 20 0 (DEGREES) i 30 -40 5 10 8 (DEGREES) Predicted effects of finite range and directive measuring antennas on the pattern of the distribution E2(y) = cos fay/b). far-field patterns 0-87\; 10-3A. a Range r — b21\. Measuring antenna aperture width: 0-98X; 11-7X b Range r = 0-36621\. Measuring antenna aperture width: Some numerical results based on eqn.

23 depends on the size of the aperture. Only supergain antennas have coefficients an significantly different from zero for n > kb/2. 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.

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