Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Reexamination Certificate
2005-09-27
2005-09-27
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
C342S445000
Reexamination Certificate
active
06950064
ABSTRACT:
A system for ascertaining angle of arrival of an electromagnetic signal having at least one signal characteristic indicating a first state or a second state includes: (a) a plurality of n antenna elements intersecting a common axis and cooperating to establish2nsectors; each respective sector being defined by two antenna elements and the axis; the signal characteristic indicating the first state on a first side of each antenna element and indicating the second state on a second side of each antenna element; combinations of the signal characteristics in each respective sector uniquely identifying the respective sector; and (b) an evaluation apparatus coupled with the antenna elements and employing the state of the signal characteristic sensed by each of the antenna elements to effect ascertaining angle of arrival to a resolution of at least one respective sector.
REFERENCES:
patent: 3947770 (1976-03-01), Cavanagh et al.
patent: 4638320 (1987-01-01), Eggert et al.
patent: 6239747 (2001-05-01), Kaminski
Transmitter Hunting: Radio Direction Finding Simplifiedby Joseph D. Moell and Thomas N. Curlee; TAB Books, a division of McGraw-Hill Inc., New York; 1987; pp. 2,28,237 and 248.
Small-Aperture Radio Direction-Finding by Herndon H. Jenkins; ArtechHouse, Boston; 1991; pp. 12-15.
Joe Carr's Loop Antenna Handbook, First Edition, by Joseph J. Carr; Universal Radio Research, Reynoldsburg, Ohio; 1999; p. 107.
Law Office of Donald D. Mondul
Next-Rf, Inc.
Phan Dao
LandOfFree
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