EP 0275303 B1 19931013 - LOW SIDELOBE SOLID STATE PHASED ARRAY ANTENNA APPARATUS
Title (en)
LOW SIDELOBE SOLID STATE PHASED ARRAY ANTENNA APPARATUS
Publication
Application
Priority
US 89145686 A 19860729
Abstract (en)
[origin: WO8801106A1] 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, Ei, and semi-major and semi-minor axes of respective lengths, ai and bi, each zone being considered separately in the far field equation: G( theta , PHI ) = [f( theta ,$ gamma ( PHI ) (â theta cos PHI - â PHI sin PHI cos theta )]<2>, wherein f( theta , PHI ) = (I), ui = (II), J1<(u>i<)> is the first order Bessel function, â theta and â PHI are unit vectors in the spherical coordinates and Ko is the wave number associated with the radiated field. Using the far field equation, values of Ei, ai and bi 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 Ei in overlapping zones are summed to establish the required voltage amplitudes of the underlying power modules associated with the N radiation apertures.
IPC 1-7
IPC 8 full level
H01Q 21/00 (2006.01); H01Q 21/06 (2006.01); H01Q 21/22 (2006.01)
CPC (source: EP)
H01Q 21/0025 (2013.01); H01Q 21/22 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 8801106 A1 19880211; DE 3787797 D1 19931118; DE 3787797 T2 19940421; EP 0275303 A1 19880727; EP 0275303 B1 19931013; JP H01500476 A 19890216
DOCDB simple family (application)
US 8701755 W 19870721; DE 3787797 T 19870721; EP 87905342 A 19870721; JP 50480387 A 19870721