We investigate the Direction of Arrival (DoA) estimation for smalland large-scale antenna arrays with a small and a large number of antenna elements, respectively. Two classes of algorithms are considered, namely subspaceand compressed sensing (CS)-based algorithms. We compare those algorithms in terms of both the DoA estimation performance and the computational complexity based on different pa...

Fractal arrays are used to increase the bandwidth of the antenna and to reduce grating lobes. The frequency range from 3.1 to 10.6 GHz is specially allocated for the UWB applications. In this paper, a novel antenna based on fractal concepts for ultra wideband (UWB) applications is analyzed, designed, fabricated and tested. Further the antenna is analyzed using the emerging fractal concepts and ...

The circular sector patch antenna is studied in C-band (4 GHz 8 GHz). In this paper, we present steps of designing the circular sector antenna then a comparison with a rectangular antenna in literature. High Frequency Structure Simulator (HFSS) software is used to compute the gain, axial ratio, radiation pattern, and return loss S11 of proposed antenna. Based on the designed patch antenna, many...

The electric field enhancement associated with detailed structure within novel optical antenna nanostructures is modeled using the surface integral equation technique in the context of surface-enhanced Raman scattering (SERS). The antennae comprise random arrays of vertically aligned, multiwalled carbon nanotubes dressed with highly granular Ag. Different types of "hot-spot" underpinning the SE...

The purpose of this paper is to introduce the concept of fractals and its use in antenna arrays for obtaining multiband property. One type of fractals namely, Cantor set is investigated. Cantor set is used in linear array antenna design. Therefore, this array know fractal Cantor linear array antenna. A comparison with conventional non-fractal linear array antenna is made regarding the beamwidth...

Measurements of a wireless channel’s spatial correlation provide guiding knowledge for developing multi-antenna wireless systems that exploit the channel’s spatial diversity. Typical measurements of spatial correlation obtained by moving an antenna array through a wireless channel provided limited correlation data that cannot be generalized to antenna arrays with different geometries. In contra...

A micro strip-fed printed bow-tie antenna is presented inorder to achieve wide bandwidth, high gain, and size reduction. A comparisonbetween the bow-tie and the quasi-Yagi (dipole and director)antennas shows that the bow-tie antenna has a wider bandwidth, highergain, lower front-to-back ratio, lower crosspolarization level, andsmaller size. Two-element arrays are designed and their characterist...

Here we address some of the issues faced by antenna engineers when testing active antennas. We review some features of phased arrays and report on how MI Technologies has dealt with the issue of measuring the effective isotropic radiated power (EIRP) and antenna patterns by use of the spherical near-field scanning technique. We take as an example the test methodology of the SAMPSON radar antenna.

In this work, a probe fed microstrip antenna design for the implementation of two dimensional arrays with individually fed radiating elements is presented. The performance of the antenna element, both isolated and in a 4× 4 fixed array topology, is analysed using ADS and HFSS simulation software. Prototypes of the antenna element and of the array are manufactured and measured for the experiment...

One of the most challenging problems in recent antenna engineering fields is to achieve highly reliable beamforming capabilities in an extremely restricted space of small handheld devices. In this paper, we introduce a new perspective on single-radiator multiple-port (SRMP) antenna to alter the traditional approach of multiple-antenna arrays for improving beamforming performances with reduced a...