This paper reports on the feasibility of using a novel and robust microwave sensing technique to analyse and detect silver materials in an aqueous solution. Two products are tested, namely: silver chloride and silver oxide. The study mainly focused on indicating the difference between them and also any change in the size/size distribution of the sample. A microwave sensor designed previously is...

An electromagnetic (EM) inverse scattering problem that involves the reconstruction of microwave images for three-dimensional (3-D) objects is considered in this paper. This ill-posed and nonlinear problem is treated as a global optimization problem, and is solved :by the application of micro-genetic algorithm (m-GA). The reconstructed results obtained by m-GA have shown that it is an effective...

This work analyzes several remote sensing instrument capabilities in monitoring dust storms. Multisensor data analysis is carried out to study the behavior of dust particles at different wavelengths. A technique based on a combination of optical and microwave sensing of dust storms, using the Moderate Resolution Imaging Spectrometer (MODIS) and the Tropical Rainfall Measuring Mission (TRMM) Mic...

An effective approach based on a multi-parameter rational fitting technique is proposed to model the microwave small-signal response of active solid-state devices. The model is identified by fitting multibias scattering-parameter measurements and its analytical expression is implemented in a commercial microwave circuit simulator. The approach has been applied to the modelling of a silicon-base...

A simple design technique for a microwave lumped and transversal filter using constant-k filter sections is presented. The noise figure can be suppressed by source degeneration inductors, which are added to the transversal element. The filter elements are analytically derived based on the specification and the noise minimization. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 116...

LLE Review, Volume 78 105 The conventional method for measuring the transfer function of an electronic device uses Fourier transform theory and convolutions and is, therefore, limited to either time-invariant or frequency-invariant devices. The measurement technique presented here enables the complete characterization of electronic devices having any dynamic temporal and spectral frequency resp...

Analysis and design techniques for designing a lumped-element 3-dB quadrature coupler with wide-band flat coupling are proposed for microwave integrated-circuit/monolithic-microwave integrated-circuit applications. The proposed design technique can produce a coupler with flat coupling over 50% fractional bandwidth, which is wider than the conventional lumped-element design methods. A prototype ...

Microwave employment in cancer detection is a new noninvasive technique meant to uncover very early tumor cells in breast tissue. Medical microwave imagistic in breast cancer detection implies special processing and fuzzy procedures to display the temperature map and to highlight the inner structure atypical development. Our research regards a practical realization of the installation and the d...

A technique for the frequency multiplication of microwave signals based on the combination of two optical nonlinear phenomena in a single nonlinear fiber is investigated. Multiple four-wave mixing is used to generate harmonics on an externally modulated optical carrier while polarization pulling through stimulated Brillouin scattering is used to filter the desired harmonics. Microwave signals i...

We realize a microwave quantum-limited amplifier that is directional and can therefore function without the front circulator needed in many quantum measurements. The amplification takes place in only one direction between the input and output ports. Directionality is achieved by multipump parametric amplification combined with wave interference. We have verified the device noise performances by...