Conical antennas as coupling structures for microwave and infrared devices

International audienceThis paper is evoted to conical antennas considered as possible coupling structures for microwave or infrared devices. According to geometrical parameters and to the operating frequency band, the radiation properties of such structures are illustrated by means of numerical or experimental results. Several exact or approximate methods are used and compared together in such a way it is possible, in a given situation, to choose the most efficient approach for calculating the radiation patterns. Such easy calculations prove to be useful in coupling optimisation of laser beams to whisker detectors or mixers

Time domain integral equation approach for inhomogeneous and dispersive slab problems

International audienceA numerical approach is described, based on a rigorous integral formulation, to the problem of an inhomogeneous dispersive slab illuminated by incident TEM plane wave with arbitrary time dependence. The slab is assumed to be nonmagnetic and its complex permittivity only varies normally to its interfaces. The numerical process consists of a space-time discretization. The solution can be determined step by step from simple recurrence formulas. Some examples are given for normal incidence in order to illustrate the most interesting features of the method and its possible field of applications

EV6: Experimental validation of sensor interaction compensation scheme for microwave imaging

International audienceAbstract:SICS, through the concept of equivalent scattered field, formally integrates sensor coupling and interaction effects. In this paper, both forward and inverse scattering problems were validated with experimental data. It is slow possible to experimentally reconstruct complex permittivity profiles using classical NLRA when the presence of sensors is non-negligible, allowing significant reductions in model noise. EV6 versatility is furthermore established by its extensive modeling capability: both open-space modulated scattering system and water-filled microwave scanner were successfully simulated Directions for future work include modeling other existing experimental systems and developing higher dimension algorithms

Linear array arrangement for microwave tomography

Recent developments both in measurement techniques and reconstruction algorithms have shown the possibility of quasi-real time microwave tomography. These technical developments always require more sophisticated experimental arrangements in order to reduce the microwave circuits complexity, decrease the measurement time, and improve the resolution. This paper deals with the use of crossed linear arrays convenient for tomography by transmission. Numerical simulations and initial experimental results show the relative advantages of such arrangements as compared to the more classical two-dimensional arrays.Peer Reviewe

Quantitative microwave imaging with a 2.45 GHz planar microwave camera

International audienc