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A new design of reflective phase-shifting surface for generating an orbital angular momentum (OAM) vortex wave in the radio frequency domain is presented in this paper. The reflective phase-shifting surface consists of single-layer square patches periodically arranged. Theoretical formulations of phase-shift distributions are deduced and used to design the reflective phase-shifting surface producing...
A two-dimensional Luneberg lens designed using a symmetrical metamaterial cell to operate a wide frequency band covering 8GHz–12GHz is proposed and studied. The proposed Luneberg lens is composed of an array of complementary circle cells and embedded in a parallel-plate TEM waveguide. Due to high resonant frequency of the complementary circle cell, the equivalent refractive index is nearly constant...
Nozzle to safe-end joint in Reactor Pressure Vessel (RPV) belongs to Ferrite -Austenite type dissimilar metal weld. It is difficult to perform UT examination because of its coarse grains. Consider of deficient detectability of sub-surface planar defects by angle longitudinal wave technique, a straight longitudinal wave technique which takes safe-end as scanning surface is put forward based on joint...
In this paper, we report our experimental and numerical results, confirming the phenomenon of dual in-phase reflection, i.e. dual-resonant behavior, for a TM-polarization plane wave oblique incidence on the conventional mushroom-like EBG structures. A modified local resonance cavity (MLRCC) model of EBG structures has been presented to explain the essential features of dual- resonant behavior and...
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