biostudies-literatureUnknown12(1)Dorrah AHEmerging technologies such as 5G communication systems, autonomous vehicles and satellite Internet have led to a renewed interest in 2D antennas that are capable of generating fixed/scannable pencil beams. Although traditional active phased arrays are technologically suitable for these applications, there are cases where other alternatives are more attractive, especially if they are simpler and less costly to design and fabricate. Recently, the concept of the Peripherally-Excited (PEX) antenna array has been proposed, promising a sizable reduction in the active-element count, especially when compared with traditional phased arrays. Albeit at the price of exhibiting some constraints on the possible beam-pointing directions. Here, we demonstrate the first practical implementation of the PEX Nature communications6109https://www.ebi.ac.uk/biostudies/studies/S-EPMC8528866biostudies-literatureExperimental demonstration of peripherally-excited antenna arrays.PMC8528866Dorrah AHEleftheriades GVfalseExperimental demonstration of peripherally-excited antenna arrays.Emerging technologies such as 5G communication systems, autonomous vehicles and satellite Internet have led to a renewed interest in 2D antennas that are capable of generating fixed/scannable pencil beams. Although traditional active phased arrays are technologically suitable for these applications, there are cases where other alternatives are more attractive, especially if they are simpler and less costly to design and fabricate. Recently, the concept of the Peripherally-Excited (PEX) antenna array has been proposed, promising a sizable reduction in the active-element count, especially when compared with traditional phased arrays. Albeit at the price of exhibiting some constraints on the possible beam-pointing directions. Here, we demonstrate the first practical implementation of the PEX 2021-01-01T00:00:00Z2021 Oct2025-04-19T15:09:07.619Z2025-04-19T15:09:07.619ZS-EPMC85288663467106010.1038/s41467-021-26404-7