| 摘要 |
<p>An antenna system (100) for an array antenna includes an array of radiators (102, 104) formed as patch antenna elements on a dielectric substrate (106), there being a shielding metallic sheet (110) on a side of the substrate (106) opposite the radiators (102, 104). A further dielectric substrate (108) and a bottom metallic sheet (112) are disposed on a side of the shielding sheet (110) opposite the radiators (102, 104). An antenna feed system (114) is disposed in the further sheet (112). Coupling devices such as orthogonal slots in one embodiment, or a microwave crossover (74B, 74T), in a second embodiment, couple electromagnetic power from the feed system (114) to the radiators (102, 104) through the shielding sheet (110). In the case of the coupling slots, the feed system provides phase quadrature signals for development of circularly polarized radiation. The crossover (74B, 74T) provides only a linearly polarized wave, and is formed of two coplanar waveguides, one in the shielding sheet (110) and one in the bottom sheet (112). Each of the coplanar waveguides includes a pair of coupling pads, the pads of one waveguide being in registration with the pads of the other waveguide</p> |
