Communications: radio wave antennas – Antennas – Wave guide type
Reexamination Certificate
1999-07-30
2001-04-03
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Wave guide type
C343S7810CA, C343S7810CA, C333S248000
Reexamination Certificate
active
06211836
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to scanning antennas and more particularly to such antennas which steer electromagnetic radiation from a dielectric waveguide in directions determined by the geometry of a rotatable cylinder (or drum) coupled to it.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,572,228 issued Nov. 5, 1996 and U.S. Pat. No. 5,815,124 issued Sep. 29, 1998 describe evanescent coupling antennas which employ rotatable cylinders placed in close proximity to a dielectric rod waveguide and operative to radiate the coupled energy in directions determined by the period of features on the surface of the cylinder. By defining rows of features where the features of each row have a different period, the radiation can be directed in a plane over a range determined by the different periods and by rotating the cylinder about an axis parallel to the axis of the waveguide.
The features on the cylinder surface, of each of the antennas disclosed in the above-noted patents, comprise conductor strips of like thickness and at a given and different spacing in each row about the cylinder. The operation of such an antenna as well as the advantages in such applications as vehicle collision avoidance systems for automobiles and aircraft and the like are described in the above-noted patents which are incorporated herein by reference.
BRIEF DESCRIPTION OF THE INVENTION
It has been discovered that by including features which vary in vertical dimension as well as in period from row to row, greater control over the transmitted (or received) waveform, arbitrary polarization, and increased gain are achieved. Accordingly, generic features of embodiments of this invention include a dielectric rod waveguide (DRW) with an electromagnetic wave launched therein and a rotatable cylinder including rows of generally circular recesses of different depths or generally circular stubs of different heights where the period in each row varies in a prescribed manner. The cylinder is rotated to scan that electromagnetic radiation over a lateral space determined by the varying feature periods and by the rotation of the cylinder.
REFERENCES:
patent: 2993205 (1961-07-01), Cooper
patent: 4001835 (1977-01-01), Dover et al.
patent: 5014069 (1991-05-01), Seiler et al.
patent: 5572228 (1996-11-01), Manasson et al.
patent: 5815124 (1998-09-01), Manasson et al.
Manasson Vladimir
Sadovnik Lev
Ho Tan
Shapiro Herbert M.
WaveBand Corporation
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