Communications: radio wave antennas – Antennas – Microstrip
Patent
1984-09-05
1987-08-11
Lieberman, Eli
Communications: radio wave antennas
Antennas
Microstrip
343853, H01Q 138
Patent
active
046865357
ABSTRACT:
A microstrip antenna system has a central two-dimensional array (preferably square having at least 16.times.16 elements) of integrally formed conductive dual slot microstrip radiator patches. A corporate-structured array of interconnected microstrip feedlines connects a common input/output r.f. signal feedpoint to each of the central array patches and also incorporates a fixed-angle phasing offset so as to steer the main lobe or beam of the overall radiation pattern off-center. The common r.f. signal input/output connection point is itself physically offset to one side of the overall composite of array elements. Auxiliary tapered amplitude linear arrays of dual slot patches also preferably extend on all sides outwardly from the periphery of the central array so as to reduce the side lobe amplitude and main lobe beamwidth of the overall radiation pattern. Both series-fed and series-tapped tapered amplitude feedlines are used depending upon whether the auxiliary linear array extends in the E-plane direction or the H-plane direction. The fixed phasing offset is preferably in the H-plane direction of the overall central array. Pairs of broad-banding microstrip stubs may be disposed along the corporate structure feedline in association with predetermined subsets of dual slot patches within the central array so as to increase the frequency bandwidth over which impedance matched signal feeding is achieved.
REFERENCES:
patent: Re29296 (1977-07-01), Krutsinger et al.
patent: Re29911 (1979-02-01), Munson
patent: 3747114 (1973-07-01), Shyhalla
patent: 3887925 (1975-06-01), Ranghelli
patent: 3938161 (1976-02-01), Sanford
patent: 4180817 (1979-12-01), Sanford
patent: 4220956 (1980-09-01), Sanford
patent: 4233607 (1980-11-01), Sanford
patent: 4356492 (1982-10-01), Kaloi
Alberding Gilbert E.
Ball Corporation
Lieberman Eli
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