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Size-reduction of circular patch absorbing elements are analyzed by introducing slits, holes, and cut-out rings. Parametric variation results are presented for slit depth, hole size, and concentric rings to reduce the size of absorbing elements. ANSYS Electronics Desktop, a finite-element method (FEM) solver, was used to simulate the absorption from an array of circular patches, while analyzing parametric...
Size-reduction techniques are applied to a circular UHF patch antenna, by varying parameters to better predict its desired resonant frequency. Specifically, slits are introduced into the patch, which are parametrically varied to determine the optimum slit dimensions for maximum size reduction.
The novel use of a phase-unwrapping algorithm is used to resolve the branch cut ambiguities that are encountered when the conventional Nicholson Ross Weir Method is used to extract the constitutive parameters in inhomogeneous materials. The algorithm is tested using a Lorentz-dispersion model.
A novel tunable band gap filter for use in the microwave and millimeter wave domain is presented. The device is based on the use of liquid crystal in resonant cells. Simulations are presented showing the tunable range and bandgap bandwidth.
This paper summarizes advances in liquid-crystal technology for use as tunable phase-delay lines. The amount of phase delay through the liquid crystal is adaptively tuned, in order to coherently combine two signals, regardless of their phase differences. By adaptively adjusting the phase delays in the two signal paths, maximum coherent power combining is ensured. This ability to coherently combine...
Simulations and measurements showed that the insertion loss and material parameters of extended S-shaped sprit-ring resonators (ESRR) change nonlinearly as a function of material thickness. This property is exploited by choosing the number of metamaterial cell layer that achieves a refraction index near one.
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