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In this paper, a two-bit phase-shifting element for reflectarray antennas is presented. The proposed element is based on the cut-ring patch coupled to delay lines through an annular slot. The four states of the reflection phase are achieved by controlling the length of two different delay lines. Prototype of element has been fabricated and characterized in X band using waveguide simulator. Measured...
The theory of formation of grain boundaries in ductile single crystals is proposed within the nonlinear continuum dislocation theory (CDT), where grain boundaries are interpreted as surfaces of weak discontinuity in placement but strong discontinuity in plastic slip. The set of governing equations and jump conditions are derived for the energy minimizers admitting such surfaces of discontinuity from...
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