Title :
Adaptation of Schelkunoff´s Superdirective Antenna Theory for the Realization of Superoscillatory Antenna Arrays
Author :
Wong, Alex M H ; Eleftheriades, George V.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada
fDate :
7/2/1905 12:00:00 AM
Abstract :
We have adapted Schelkunoff´s method of antenna pattern synthesis to the design of superoscillatory waveforms. Our method stems from the observation that superdirectivity and superoscillation are dual phenomena in the space and spectral domains; it can be applied to construct any periodic superoscillatory wave functions. Using this method, we designed two subwavelength focusing schemesin free space and within a waveguideat an image distance of five wavelengths. We first describe how we extend the concept of superdirectivity toward constructing superoscillatory waveforms, then provide in-depth formulations as they apply to each design example. We also report full-wave simulation results verifying subwavelength focusing to 0.6 times that of the diffraction limit at a distance five wavelengths away from the source.
Keywords :
antenna arrays; antenna radiation patterns; antenna theory; directive antennas; Schelkunoff adaptation; antenna pattern synthesis; periodic superoscillatory wave functions; superdirective antenna theory; superoscillatory antenna arrays; superoscillatory waveforms; Diffraction limit; image resolution; subwavelength focusing; superdirectivity; superoscillation;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2010.2047710