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In this work the least squares method is used to reduce the anisotropy in transformation optics. To apply the least squares method we added power series on the coordinate transformation functions whose coefficients were calculated to reduce the deviations in Cauchy-Riemann equations. This technique does not violate boundary conditions necessary to avoid reflections on the borders and the functionality...
We report the observation of negative group delay in a simple anisotropic cylindrical waveguide in the millimeter-wave region. With a 45° linearly polarized input, a relatively broad band of negative group delay was observed with 3.57% bandwidth, where the maximum group advancement achieved was about 24 times greater than the luminal delay, implying a fractional advancement of 13.32%. The peak advancement...
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