Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Patent
1992-08-24
1993-09-07
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
G01S 316, G01S 328
Patent
active
052433528
ABSTRACT:
An antenna system comprises: a main antenna; a first sub antenna arranged in such a way that the first sub antenna adjoins the main antenna in the X direction which is the orientation of a beam width of the main antenna to be reduced and the beam axis of the first sub antenna coincides with the beam axis of the main antenna; and a second sub antenna arranged in such a way that the second sub antenna adjoins the main antenna in the Y direction perpendicular to the X direction and the beam axis of the second sub antenna coincides with the beam axis of the main antenna; wherein an antenna beam of the antenna system is scanned in a direction other than the X and Y direction and multiplication is carried out between a signal received with the main antenna and each signal received with each sub antenna on the condition that phases of these signals coincide with each other so that a two-dimensional reduction in a beam width is achieved. When the second sub antenna does not have an isotropic antenna pattern in the X direction and the beam-scanning is carried out in the X direction, a one-dimensional reduction in a beam width and side lobes is achieved. When the second sub antenna does not have an isotropic antenna pattern in the X direction and the beam-scanning is carried out in a direction other than the X and Y direction, a two-dimensional reduction in a beam width and a one-dimensional reduction in side lobes is achieved. In the case that the first and second sub antennas do not have isotropic antenna patterns in the Y and X direction respectively and the antenna beam is scanned in a direction other than the X and Y direction, a two-dimensional reduction in a beam width and two-dimensional reduction in side lobes are achieved.
REFERENCES:
patent: 4612549 (1986-09-01), Geyer, Jr. et al.
patent: 4888594 (1989-12-01), Friedman et al.
Blum Theodore M.
National Space Development Agency of Japan
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