Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1989-02-23
1993-08-03
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342372, H01Q 322
Patent
active
052333566
ABSTRACT:
A low sidelobe, solid state array antenna apparatus comprises a large radiating aperture divided into a large number, N, of small, closely spaced radiating apertures, each small radiating aperture having associated therewith a radiating element and a linearly polarized solid state power module. The large radiating aperture is divided into M, preferably between 3 and about 10, differently sized, elliptically shaped, concentric radiating zones superimposed, for analysis purposes, upon another. Each such zone has an output voltage amplitude, E.sub.i, and semi-major and semi-minor axes of respective lengths, a.sub.i and b.sub.i, each zone being considered separately in the far field equation: ##EQU1## J.sub.1 .sup.(u i.sup.) is the first order Bessel function, a.sub..theta. and a.sub..phi. are unit vectors in the spherical coordinates and K.sub.o is the wave number associated with the radiated field. Using the far field equation, values of E.sub.i, a.sub.i and b.sub.i for each zone are computed which result in the far field sidelobe peak gain being a minimum or being a specified number of dB, for example, at least about 30 dB, below the far field mainlobe gain. The values of E.sub.i in overlapping zones are summed to establish the required voltage amplitudes of the underlying power modules associated with the N radiation apertures.
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Lee Jar J.
Tang Raymond
Denson-Low Wanda K.
Hellner Mark
Hughes Aircraft Company
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