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Ultra Wide Band Radar is a novel technology used for breast cancer detection. This imaging modality uses ultra wide band waveforms to form a reflectivity map of the breast region in which tumors can potentially been clearly distinguished. In this study, the authors assess the use of a novel Breast UWBR reconstruction approach, microwave holography, on anthropomorphic phantoms. These phantoms mimic...
During the last decade, Microwave Radar has been proposed as a complimentary technology for breast cancer detection. This imaging modality has several features that make it quite desirable from a clinical viewpoint, such as the use of non ionizing radiation. Nevertheless, some aspects of this technology need to be optimized so that it can be routinely used in clinical scenarios. This paper presents...
A printed elliptical monopole antenna operating at 1–4 GHz frequency for biomedical imaging applications is presented in this article. To reduce the reflection of the microwave signal from breast, glycerin is used as the coupling medium (εr = 9, σ = 0.4 S/m, tan δ = 0.28) whose electrical properties are close to those of breast tissue. Directional patterns and reduced back radiations are achieved...
Modifying a solid conductor with multiple thin laminated conductors can significantly reduce the ohmic loss of microstrip conductors. This concept can be used in circuits and antennas where substantial conductor loss occurs. The lamination in the composite material is realized using dielectric material. The laminating dielectric thickness is smaller or of the order of the skin depth of the conductor...
A printed elliptical monopole antenna is proposed for biomedical imaging application. The antenna is designed to operate at 2–9 GHz. For efficiency coupling of the microwave signal to the breast, a coupling medium (canola oil) is chosen having permittivity of 3. This also helps in miniaturizing the antenna size. Glycerin (εr = 9) is used as the breast phantom material. The antenna parameters are optimized...
A stacked circular patch antenna is studied to be used as the reflector feed. Large bandwidth is achieved using stacked patches. Circular symmetric patterns with low cross-polarization are achieved from this antenna by optimizing the ground plane size for a particular substrate permittivity. With a ground plane size of only 0.3λ, good front-to-back ratio is also possible along with good pattern symmetry...
A method to reduce the ohmic loss of microstrip conductors is discussed where, instead of having a single solid conductor, multiple laminated conductors are used to form the composite conductor. The laminating thickness is smaller or of the order of the skin depth of the conductor. First, it is shown analytically that in this engineered material, the power lost in the material is less compared to...
The design of a double-ridged horn antenna for medical imaging is presented in this paper. The antenna is immersed in canola oil to reduce its size and to achieve efficient coupling of the electromagnetic energy to the breast tissue. The antenna has wideband performance from 1.5 GHz to 5 GHz (3.5 GHz or 108% of impedance bandwidth), which is suitable for radar-based medical imaging. The double-ridged...
A miniaturized double-ridged horn antenna for use as an array element in the Subsurface Radar (SR) system is presented. SR has been proposed for some emerging applications such as breast imaging and wood inspection. A cylindrical scanning geometry is proposed which will host 72 antennas in a row for illuminating the target and receiving scattered signal. The scanning system will have several rows...
The design of a miniaturized double-ridged horn antenna for use as an array element in the Subsurface Radar (SR) system is presented. The array antenna system will be arranged in a cylindrical scanning geometry which will host 72 antennas in a row for illuminating the target and receiving scattered signal. The scanning system will have several rows of antennas for better sensitivity and spatial accuracy...
A physically small - sized double-ridged horn antenna is presented for use as an array element in the Subsurface Radar (SR) system. The miniaturization is achieved by loading the antenna with a very high-permittivity material and also by reducing the flare length in the horn section. The effects of size reduction on the reflection and transmission response of the antenna are studied.
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