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Target DOA Estimation using GLRT and Crosstalk Reduction for MIMO Radar
No full textMultiple-Input Multiple-Output (MIMO) radars with colocated antennas have been shown to have higher resolution and better accuracy in target localization than standard phased-array radars. However, due to the proximity of the antenna elements, direct coupling between the transmitters and the receivers (crosstalk) may exist and degrade in the narrowband case the performance of some detection techniques, such as the Generalized Likelihood Ratio Test (GLRT) based one. This paper presents a crosstalk reduction technique for MIMO radar
Evaluation of pathological changes due to radiation exposure from telecom antennas on albino rats kidneys
No full textThis work aimed to investigate the effects of radiation from telecom antennas on rats kidneys .ninety six male rats were exposed to three radiation levels,.Eight rats from each group were examined after six and twelve weeks. The resultsc shown clear different in all investigated parameters. We concluded that exposure to tower radiation can cause several dameges on rats kidneys
Statistical Analysis of Matching Properties of Randomly Distributed Thin and Thick Dipoles
No full textA statistical analysis of the matching properties of a dipole surrounded by thin and thick randomly distributed loaded dipoles is presented. The input impedance and input reflection coefficient of the driven dipole is obtained by using the IEMF method and validated by NEC and measurements. The cumulative distributed functions are presented for different dipole densities and the mismatch of a surrounded thin or thick dipole is studied for different surrounding loads
Conformable metasurface patches for mm-waves holographic applications
No full textWe present our work on the design, fabrication and characterisation of conformable metasurface patches in the mm-wave range for holographic applications
Single-layer representation of the field scattered by a collection of objects
No full textWe provide a new representation of the field based on a single-layer integral. The potential has support on an arbitrary line enclosing the scatterers and can be used in a fast multipole algorithm. The results are presented in the bidimensionnal case for simplicity
Coupling Between Surface Acoustic Waves and Localized Plasmons in Pillared Phononic Crystals
No full textWe present a theoretical study of the interaction between surface (Sezawa) acoustic waves propagating at the surface of a multilayer structure supporting Au pillars with the metal-insulator-metal (MIM) type plasmons localized between each pillar and a Au film underneath. The strength of the coupling is evaluated from the modulation of plasmonic properties by the acoustic waves. The highest coupling rates are obtained for a compressional mode of the pillars and for some of the propagating Sezawa modes
Isolation Enhancement in Microstrip Patch Antenna Arrays
No full textCollinearly placed patch antenna arrays, printed on high permittivity dielectric substrates, suffer from an unwanted inter element coupling due to strong surface waves. A new shaped Defected Ground Structure (DGS) is proposed to suppress such waves in between elements. A low dimensional µ shaped DGS is carved out in between two E-plane patch antennas to reduce considerably the amount of coupled power and effectively improve return loss and impedance bandwidth of antenna elements. Simulation results are analyzed and discusse
Plasmonic-based Photothermal Conversion
No full textNumerous applications are based on the capability of plasmonic nanoparticles to locally increase the temperature. These are two main issues: the first one is the choice of the materials and the second one is the way to locally characterize the temperature enhancement. In this presentation, we will address these two issues
Transverse-Magnetic Wave Propagation in a Plane Waveguide Filled with Anisotropic Kerr Medium: Essentially Nonlinear Guided Regime
No full textPropagation of electromagnetic waves in a waveguide filled with anisotropic Kerr medium is considered. The nonlinearity involves two non-negative parameters. If both parameters are zeros, then one arrives at a linear problem that has a finite number of eigenwaves. If the first parameter is positive and the second one is nonnegative, then the nonlinear problem has infinitely many solutions; only a finite number of these solutions have linear counterparts. This predicts existence of an essentially nonlinear guided regime
Nonreciprocal Phased-Array Antenna Systems
No full textThis talk describes the concept and experimental demonstration of nonreciprocal phased-array antennas able to exhibit (i) an independent control of their transmission and reception patterns at the same operation frequency; and (ii) nonreciprocity at the polarization level, i.e., transmit with one polarization but receive with the opposite handedness. The proposed approach can be applied to develop efficient nonreciprocal phased-array antennas across the electromagnetic spectrum and find broad applications in wireless communication and polarimetric radar and sensing systems