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Updated: Aug 16, 2025

Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays
Published on: June 13, 2023
Alias-Free Arrays
David Tucker1, Shen Zhao2, Rizwan Ahmad3
1Electrical & Computer Engineering, Ohio State University, Columbus, OH 43210.
Abstract:
Nonuniform array geometries provide freedom for increased aperture and reduced mutual coupling. A necessary and sufficient condition is given for an array of isotropic sensor elements to be unambiguous for any specified set of directions of arrival. The set of unambiguous spatial frequencies is shown to be a parallelepiped, admitting simple geometrical interpretation. Results are used in design of linear, planar, and 3D arrays.
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