Abstract
In this paper, we derive a theory for the modeling of 3-D cylindrical cloak based
on 2-D finite-difference time-domain method, which is less time consuming and memory
saving. By using the method, we develop the concept of invisibility angle and
investigate the invisibility performance of the 3-D cylindrical cloak with 2-D
constitutive parameters under off-plane incident waves. The bistatic radar cross
sections as well as the scattered fields are calculated to evaluate the scatterings,
from which the invisibility performance is observed to get worse with the increase in
the incident angle, while the defined invisibility angle diminishes with the decrease in
the cloak thickness and wavelength. The deterioration of the invisibility performance is
mainly caused by the scatterings of TM<sub>2</sub> wave defined in the study. The present
results point out a possible way to evaluate the 2-D cloak on 3-D
applications.
© 2012 IEEE
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