The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 1993
Filed:
Feb. 23, 1989
Jar J Lee, Irvine, CA (US);
Raymond Tang, Fullerton, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
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.