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A theoretical and experimental study of a novel image reconstruction algorithm for an Ultra Wideband (UWB) Microwave Imaging System aiming at detecting and locating small targets in a homogenous circular cylindrical dielectric body is presented. The system uses a double circular scan in which the second scan is achieved after rotating by a small angle the antenna sub-system or the imaged body. The...
The paper describes the design of an ultra wideband (UWB) microwave imaging system employing a 12-element circular array antenna. The array uses compact tapered slot antenna (TSA) elements operating over 3.1–10.6 GHz band. The elements of the array are activated by two coaxial SP6T switches that are connected to a vector network analyser (VNA) to achieve monostatic or multi-static radar modes of operation...
An experimental investigation into capabilities of an ultra wideband (UWB) microwave radar to detect breast cancer is presented. A phantom, consisting of a cylindrical plastic container with a low dielectric constant material imitating fatty tissues and a high dielectric constant object emulating tumour, is scanned over a circular cylindrical surface with an UWB probe antenna. Following the collection...
In this paper, the design of a low cost reflectometer, which provides operation over an ultra wide frequency band from 3.1 to 10.6 GHz, has been presented. The device is fully integrated and uses five couplers and one power divider in microstrip-slot technology. The design has been accomplished with the use of commercially available full-wave CAD package, CST Microwave Studio. The designed device...
The paper reports on experimental investigations into microwave properties of various materials that can be used to imitate real tissues in a breast phantom for testing an ultra wide band breast cancer radar detection system. The experiments involve an open ended probe technique to measure permittivity of selected materials across an ultra wide frequency band from 2 to 15 GHz.
The design of ultra-wideband vias and power dividers in microstrip-slot technology is presented. The devices employ two substrates supported by a common ground plane. Their design is accomplished with the use of commercially available full EM analysis and design software. Low insertion loss and good return loss performances over an ultra wide frequency band for the designed structures are noted.
An experimental and theoretical study concerning capabilities of an ultra wideband (UWB) microwave radar to detect breast cancer is presented. A simple phantom, consisting of a cylindrical plastic container with a low dielectric constant material imitating fatty tissues and a high dielectric constant object emulating tumour, is scanned over a circular cylindrical surface with an UWB probe antenna...
Recent years have shown a considerable interest in using a wideband microwave radar technique for detecting and locating breast cancer. The basis for microwaves to detect and locate tumour is the difference in the electrical properties of normal and malignant breast tissue. Normal breast tissue is largely transparent to microwaves while lesions, which contain more water and blood, scatter them back...
The design of an ultra wideband planar monopole antenna for use in a circular cylindrical microwave imaging system is presented. The designed antenna is developed on a high dielectric substrate and its size is 13 mm by 26 mm. The measured 10-dB return loss bandwidth of this antenna element is from 3 GHz to more than 15 GHz. Its radiation efficiency is higher than 90% over the whole 10 dB return loss...
An experimental study concerning planar and cylindrical configurations of a microwave imaging system with step-frequency synthesized pulse for breast cancer detection is described. A simple phantom, consisting of a cylindrical plastic container with low dielectric constant material imitating fatty tissues and a small highly reflective object emulating tumour, is scanned with a probe antenna in the...
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