Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1981-02-23
1983-04-26
Lieberman, Eli
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343854, H01Q 324, H01Q 1506
Patent
active
043815090
ABSTRACT:
The bandwidth limitation in space fed phased arrays (that results from the use of phase shifters to implement beam steering) is overcome by a lens arrangement in which independent feeds are provided at the focal plane of the lens. Each feed generates a collimated beam in a different spatial direction. Each beam can then be steered about its central position by means of phase shifters, while retaining a substantially improved bandwidth. An algorithm is derived for designing three-dimensional (3D) microwave lenses with line source feeds by stacking a number of identical two-dimensional (2D) parallel-plate, wide-angle constrained lenses into a cylindrical antenna structure. This lens design provides focused beams over a wide range of scan angles in both elevation and azimuth with only small optical aberration. A wide variety of lens designs can be achieved through this algorithm, dependent upon the constraints which are selected for the 2D lens counterpart. For one design, where all the transmission line lengths in the lens are made equal, the phase errors for beam scanning in the plane containing the cylindrical axis of the antenna are less than their broadside values, regardless of scan angle. This permits wide-angle coverage in both elevation and azimuth from a single lens with both good beam and quality and bandwidth.
REFERENCES:
patent: 4268831 (1981-05-01), Valentino et al.
patent: 4348678 (1982-09-01), Thomas
"Wide-Angle Microwave Lens for Line Source Applications", W. Rotman et al.-Nov. 1963 IEEE Transaction on Antennas and Propagation.
Franchi Peter R.
Rotman Walter
Lieberman Eli
Matthews Willard R.
Singer Donald J.
The United States of America as represented by the Secretary of
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