An optimal design of a linear antenna array is presented. The antenna array is optimized using a particle swarm optimization based method in order to produce a radiation pattern that has the minimum possible side lobe level and the maximum possible gain at the desired direction. The method has been applied to collinear wire-dipole arrays and seems to be suitable for improving the radiation patt...

A novel printed antenna resembling a truncated SINC function is proposed for wireless communications. The proposed antenna functions either as a twisted dipole or two twisted back-to-back connected L-shape dipoles depending on the current mode. Due to the symmetry, the antenna supports an even or odd mode of current on the antenna and results in different design and performance considerations. ...

The radiation characteristics of a monopole antenna that consists of one-half of a bow-tie dipole antenna, made of optically transparent conductive thin film and mounted above a ground plane, are investigated. The antenna is measured for several films with different sheet resistivities. It is found that the gain lowering of the antenna varies from 4.4 dB to 0.2 dB at 2.4 GHz and the efficiency ...

The results of a full-wave analysis of the performances of ADS-based thinned arrays of wire dipoles are presented. The pattern features of the ADS layouts are numerically evaluated by considering different aperture sizes, lattice spacings, and dipole lengths. The outcomes are that, despite a slight and expected performance worsening, the a-priori PSL bounds deduced for the “ideal” case still pr...

The usage of ultra-wideband (UWB) technology is growing in many communication systems such as radar systems, communication and measurement systems and imaging systems mainly because unlike the other wireless technologies UWB is not restricted to using a narrow waveband and it has high speed data rate. The large transmission bandwidth makes UWB-based electronic device resistive to interferences ...

5.1 INTRODUCTION MIMO wireless systems have demonstrated the potential to increase communication spectral efficiency in a rich multipath environment. From an antennas perspective, different array configurations and types of element have been proposed and analyzed for MIMO links. Nowadays in military and commercial applications there have been ever growing demands for antennas. The standard dipo...

A simple derivation of the Jalilian-Marian, Iancu, McLerran, Weigert, Leonidov and Kovner (JIMWLK) equation for the evolution of small-x QCD wavefunctions is given. The derivation makes use of the equivalence between the evolution of a (in general complicated) small x wavefunction with that of the evolution of the (simple) dipole probing the wavefunction in a high energy scattering.