A two-dimensional (2D) dynamically reconfigurable metasurface aperture is presented to perform frequency selective through wall imaging (TWI) with an unknown structure of the wall. Generally, in TWI, medium properties and thickness need be known advance, which not always possible. Moreover, compensating for these effects can significantly increase computational complexity. We propose a two-stag...

This paper presents the design and optimization of patch-like antennas for Through-The-Wall Imaging (TTWI) radar applications in the frequency range 0.5-2 GHz. A basic antenna configuration is analyzed and modified through an optimization aiming at reducing the size of the antenna and at focusing the radiated power in a single lobe to be directed towards the wall and the targets to be detected....

Microwave array 3-D imaging is an emerging technique capable of producing a 3-D map of scattered electric fields. Its all-weather and large scene imaging features make it an attractive powerful tool for target detection and feature extraction. Typically, a microwave array 3-D imaging system based on the classical sampling theory requires a large dense 2-D antenna array, which may suffer from a ...

Current clinical breast imaging modalities include ultrasound, magnetic resonance (MR) imaging, and the ubiquitous X-ray mammography. Microwave imaging, which takes advantage of differing electromagnetic properties to obtain image contrast, shows potential as a complementary imaging technique. As an emerging modality, interpretation of 3D microwave images poses a significant challenge. MR image...

In through-the-wall radar imaging (TWRI), wall returns are often stronger than target returns, which make the targets behind walls invisible in the radar image. Spatial filtering that relies on the removal of the spatial zero-frequency components is a useful way for wall-clutter mitigation. Unfortunately, it applies to through-the-wall radar (TWR) with synthetic aperture array only. In this pap...

The endogenous contrast in thermoacoustic imaging is due to the water and ionic content in tissue. This results in poor tissue specificity between high water content tissues. As a result, exogenous contrast agents have been employed to improve tissue specificity and also increase the SNR. An investigation into the sources of contrast produced by several exogenous contrast agents is described. T...