Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1992-03-09
1996-08-06
Brown, Peter T.
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343755, 343756, 343779, 343909, 343913, H01Q 128, H01Q 346, H01Q 1917, H01Q 2124
Patent
active
055438091
ABSTRACT:
A dual-polarized antenna includes a planar line or surface array of reradiating elements of two different polarizations. Each reradiating element in one embodiment is a short-circuited vertical or horizontal dipole. The vertical and horizontal dipoles may be collocated on the array to form crossed short-circuited dipoles. The elements of each polarization form an array separate from the elements of the other polarization. Within each of the two separate arrays, the 1/.lambda. of each reradiator is adjusted to provide a phase shift which causes a collimated beam incident on the array to result in reradiation or "reflection" of energy in the form of a beam converging at a focal point. Therefore, each planar reradiator array acts as a parabolic reflector with a particular focal point. The focal points for the vertical and horizontal arrays are different, and a feed of the appropriate polarization is located at each of the two focal points. A satellite includes a communication system operating in a "frequency re-use" mode, with mutually alternate, overlapping-frequency channels transmitted (and received) on mutually orthogonal polarizations.
REFERENCES:
patent: 4590480 (1986-05-01), Nikolayuk et al.
patent: 4684952 (1987-08-01), Munson et al.
patent: 4733244 (1988-03-01), Edenhofer et al.
patent: 4905014 (1990-02-01), Gonzalez et al.
patent: 5014070 (1991-05-01), Stock et al.
Berard C. A.
Brown Peter T.
Martin Marietta Corp.
Meise W. H.
Young S. A.
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