Abstract
A new concept is proposed for reducing the number of active antenna elements in a scannable phased array. The proposed approach is based on the recent concept of the Huygens’ metasurface. In such a metasurface, the fields in a given region are controlled by electromagnetic sources on the boundary surface of this region. Using this approach, a peripherally excited (PEX) metallic cavity is engineered to radiate a beam by appropriately perforating its top surface. This pencil beam can be scanned by simply changing the phases of the peripheral sources. The proposed concept has the potential to drastically reduce the required active elements in 2D phased arrays without compromising directivity. However, this also leads to constraints on the possible beam-pointing directions.
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