Compact antenna arrays with wide bandwidth and low sidelobe levels
| DWPI Title: Layered radiator apparatus for radiating synthetic aperture radar (SAR) signals has first slot which is in overlapping relationship relative conductive units that are physically separated and electrically isolated from one another |
| Abstract: Highly efficient, low cost, easily manufactured SAR antenna arrays with lightweight low profiles, large instantaneous bandwidths and low SLL are disclosed. The array topology provides all necessary circuitry within the available antenna aperture space and between the layers of material that comprise the aperture. Bandwidths of 15.2 GHz to 18.2 GHz, with 30 dB SLLs azimuthally and elevationally, and radiation efficiencies above 40% may be achieved. Operation over much larger bandwidths is possible as well. |
| Use: Layered radiator apparatus for radiating SAR signals. |
| Advantage: Provides a phase balance across the aperture since the energy arrives at all input ports of the respective radiator unit cells at the same time. Suppresses SAR image degradation while reducing the cost of the SAR antenna arrays having lightweight low profiles since the stripline feed and microstrip sections include the conductive units which are physically separated from one another and electrically isolated from one another while the first slot is in overlapping relationship relative to all of the conductive units. |
| Novelty: The layered radiator apparatus (10) has a layered antenna section which is stacked adjacent the microstrip section (41). The antenna section includes a patch radiator (31) defining a second slot, and a dielectric layer that is disposed between the patch radiator and the microstrip section. The stripline feed section (61) and microstrip section include the conductive units which are physically separated from one another and electrically isolated from one another. The first slot is in overlapping relationship relative to all of the conductive units. |
| Filed: 3/22/2010 |
| Application Number: US2010728735A |
| Tech ID: SD 11434.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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