Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Reexamination Certificate
2006-04-18
2006-04-18
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
C342S383000, C342S384000
Reexamination Certificate
active
07030813
ABSTRACT:
Improved punch-through performance is provided for applications such as sum and difference mode processing for IFF and other applications. With an array including a row of elements, difference sidelobe levels are increased relative to sum sidelobe levels by independently controlling relative signal levels of difference mode signals provided from signals received by central elements of the array. By processing signals from central elements independently from processing of signals from outer elements of the array, difference mode signals derived from the central elements may be employed at higher signal levels in order to raise difference mode sidelobe levels to improve punch-through performance. Antenna systems and methods are described.
REFERENCES:
patent: 3803624 (1974-04-01), Kinsey
patent: 3943523 (1976-03-01), Fassett
patent: 4912477 (1990-03-01), Lory et al.
patent: 5030960 (1991-07-01), Bartley
patent: 5248984 (1993-09-01), Sezai
patent: 5506589 (1996-04-01), Quan et al.
BAE SYSTEMS Information and Electronic Systems Integration Inc.
Phan Dao
Robinson Kenneth P.
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