We uncover how to achieve giant Q-factors in finite-length periodic arrays of subwavelength optical resonators. The underlying physics is based on interference between the band-edge mode and a standing array, it leads formation spatially localized states with dramatically suppressed radiative losses. demonstrate this concept for an array N dipoles simultaneous cancellation multipoles up N-th or...

The theory, design, fabrication, and measurement of new uniform circular arrays (UCAs) for direction of arrival (DOA) estimation is presented in this report. In particular, the effect of directional antenna elements in UCAs for DOA estimation is studied in detail. While the vast majority of previous work assumes isotropic antenna elements or omnidirectional dipoles, this work demonstrates that ...

An innovative method for antenna arrays beam configuration is presented. In the proposed method, every element of the array is connected to its feed through a switch, so that it can be active or passive, depending on the switch position. Pattern reconfigurability is achieved by appropriately switching on or off the array elements. The optimal configuration of the switches for each of the radiat...

Covering arrays of strength two have been widely studied as combinatorial models of software interaction test suites for pairwise testing. While numerous algorithmic techniques have been developed for the generation of covering arrays with few columns (factors), the construction of covering arrays with many factors and few tests by these techniques is problematic. Random generation techniques c...

A theory of light reflection and transmission by an optically thin nanocomposite slab that contains randomly distributed metal nanoparticles (NPs) is developed. The underlying model treats NPs as point dipoles employs a dyadic Green’s function known analytically for allows one to obtain the refection coefficients in fully analytical form. also takes into account enhanced decay localized surface...

By analyzing the parameters of electronic transitions, we show how bosonic Sr atoms in planar optical lattices can be engineered to exhibit magnetism and other higher-order electromagnetic multipoles that harnessed for wavefront control incident light. Resonant $\lambda\simeq 2.6\mu$m light $^3D_1\rightarrow {^3}P_0$ transition mediates cooperative interactions between while are trapped a deepl...

Some new focusing properties of time-domain ultra wide band (UWB) focusing array antennas are presented. The large current radiator (LCR) is considered as the UWB antenna element. Each LCR is replaced by a set of infinitesimal dipoles modeling both the near field and the far field patterns of the antenna element, as well as the coupling between the elements. Several antenna arrays with differen...

This paper shows the influence of small coupled antenna arrays on the MIMO efficiency. Two different antenna models with varying antenna distances are investigated: dipoles and realistic terminal antennas. Two solutions to decouple the antennas are presented: 1) A parasitic element; 2) A hardware design of a matching network on a substrate which is the first implementation of a recent proposal ...