| 摘要 |
A dual-polarization geometry for printed-circuit antennas, in which two layers of radiating elements and corresponsing power dividers are provided, one set (400) of power dividers being disposed orthogonally with respect to the other (200), so as to enable reception of two signals with orthogonal senses of polarization. Either dual linear or dual circular polarization may be achieved through suitable selection of radiating elements. Alternatively, a quadrature hybrid may be coupled, either externally or as an integral part of the antenna, to enable dual circular polarization. Various shapes and types of radiating elements (16b), having patches or slots, may be employed in the various layers. Further, a gridded radiating element, formed of a grid (300) wherein a metallization region is etched selectively to yield a plurality of metal strips (16a) disposed parallel to each other with a predetermined separation, may be used. This element, in contrast to known elements which employ solid metallization regions, finds particular application in dual polarization geometries, wherein two signals are received simultaneously, and enables improved performance over a wide bandwidth. The gridded element also is applicable to single-polarization geometries. |
