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A synthetic bandwidth radar as an approach to build ultra-wideband (UWB) imaging systems is presented. The method provides an effective solution to mitigate the challenges of UWB antenna's implementation with ideal performance. The proposed method is implemented by dividing the utilized UWB into several channels, or sub-bands, and designing an antenna array that includes a number of antennas equal...
The design of four tapered slot antennas covering four channels of a novel microwave imaging system that is based on the synthetic bandwidth radar (SBR) technique is presented. The SBR technique aims to synthetise a number of antennas working separately over different sub-bands and produces an equivalent antenna with ideal performance over the entire bandwidth using a proper signal processing method...
The concept of an Ultra Wideband (UWB) Monopulse Microwave Radar System for detection and location of breast cancer is described. The system uses a two-element Tapered Slot Antenna (TSA) array accompanied by a UWB 180° hybrid which scans the breast. When the breast tissue features symmetry with respect to the array axis and the hybrid enables the 180° out phase feeding operation, the array automatically...
This paper has reported a microwave imaging system employing a monopulse radar technique to eliminate adverse effects of strong reflection from the air-imaged body interface. This technique is realized using a newly constructed ultra wideband twoelement probe antenna fed by a 180° hybrid. The validity of the proposed system has been verified via full-wave EM simulations. Using the signal data obtained...
In this paper, we apply an ultra wideband radar technique to detect and locate small cylindrical objects in a dielectric cylindrical body emulating the woman's breast. We propose a new image reconstruction algorithm which exploits the monopulse radar principle involving a 2-element array antenna. Using the difference of two signals received by the elements of this array, the part of the signal due...
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...
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