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This paper investigates the performance of two different feed structures for Vivaldi antennas. It is shown that cross polarization performance depends on both guiding and feed regions. The effect of feed region is very important and cross polarization can be decreased by reducing the feed radiation. The performance of a double layer Vivaldi antenna fed by stripline and a single layer one fed by Y2Y...
In this paper, we describe a 2-D wideband microwave imaging system intended for biomedical imaging. The system is capable of collecting data from 3 to 6 GHz, with 24 coresident antenna elements connected to a vector network analyzer via a 2 ?? 24 port matrix switch. As one of the major sources of error in the data collection process is a result of the strongly coupling 24 coresident antennas, we provide...
In this paper, the reflection characteristics of the house flooring construction materials at millimeter-wave (MMW) frequencies are studied. Since this investigation is performed for North American housing, the 57-64 GHz frequency band is considered. In this study, three common flooring materials: hardwood, vinyl and carpet (cut- and loop-pile) are chosen. The reflection characteristics of the aforementioned...
We describe a 2D wide-band multi-frequency microwave imaging system intended for biomedical imaging. The system is capable of collecting data from 2-10 GHz, with 24 antenna elements connected to a vector network analyzer via a 2 times 24 port matrix switch. Through the use of two different nonlinear reconstruction schemes: the Multiplicative-Regularized Contrast Source Inversion method and an enhanced...
Recently there has been significant attention given to imaging biological tissues using microwave radiation. In order to verify microwave imaging algorithms, realistic body models are needed to measure and simulate the penetration of microwave energy into the tissue and to reconstruct the image. We have created a phantom which has dielectric properties that are close to the properties of the real...
In this paper the 2D and 3D scattering problems are investigated. It is shown that only for special cases; these two methods provide the same unique answer. The level of error for other cases is investigated. In MI, both plane wave and infinite line sources are important. In this paper the line source excitation is considered. The results and the detailed proof will be provided during the presentation...
In the work of Shafari and Shafai (2009) a parametric study, using Ansoft HFSS, on the effect of aperture diameter on transmission properties of an array of apertures is performed. The unit cell included a centered circular aperture on a ground plane, where aperture diameter was swept over a wide range. The unit cell was chosen to have the same transverse dimensions as X-band waveguide, i.e. Sx =...
A method for improving polarization purity of the tapered slot antenna (TSA) is investigated. The conventional TSA antenna and the proposed new design are investigated. Simulation and measurement results show a significant improvement in the cross polarization level of the proposed geometry, within a wide frequency bandwidth.
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