Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1993-10-28
1996-03-26
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342372, 342 81, H01Q 322
Patent
active
055024475
ABSTRACT:
A beam sharpened antenna pattern is achieved by intercoupling signals from individual radiating elements of an array to produce a sum mode signal and a ring mode signal. The ring mode signal represents a forward-directed antenna pattern having a zero to 360 degree progressive phase characteristic around a pattern axis. Beam sharpening results from processing the sum and ring mode signals to provide a pattern having 360 degree beam sharpening, which represents portions of the sum mode pattern of amplitude greater than the amplitudes of selected portions of the ring mode signal. The ring mode signal may be provided on a predetermined basis after selected attenuation or amplification in order to provide a beam sharpened antenna pattern having a modified characteristic. In some applications, received signals are processed on a simultaneous sum mode and ring mode basis, while during transmission pulsed sum mode and ring mode antenna patterns are activated on a sequential, timed basis. Arrangements for use of the invention with two-dimensional-scan and one-dimensional-scan phased arrays are also described.
REFERENCES:
patent: 3576579 (1971-04-01), Appelbaum
patent: 4425567 (1984-01-01), Tresselt
patent: 4962383 (1990-10-01), Tresselt
patent: 5248984 (1993-09-01), Sezai
Hannan Peter W.
Kumpfbeck Richard J.
Hazeltine Corporation
Onders E. A.
Phan Dao L.
Robinson K. P.
Tarcza Thomas H.
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