In this paper, we investigate a novel fast and reliable method to check the bonding quality of silicon wafers. It
is based on illuminating the wafers with a high frequency waves (110 - 170 GHz) using quasi-optical technique.
The reflected energy is used to evaluate the bonding strength. The reported experimental study is compared
with the Infrared images.
Single split-ring resonators has a great interest due to their refractive index facility. In this paper we provide a
comprehensive study, supported with experimental data, that addresses the effect of the type of the substrate and
the geometric parameters on the resonant frequency and the quality of the design. The measurements are carried
out using quasi-optical technique in mm-wave frequency range. We also provide recommendations concerning
the main factors that should be considered in designing split open ring resonators at mm-wave frequency range.
Active millimeter wave imaging technology is emerging, which has the potential to yield much more information when
one has control over the illumination parameters. Image processing of this kind of images is almost inexistent in
literature. In this paper, we propose multidimensional illumination techniques to improve the mm-wave image quality.
Multi-angle, multi-frequency, and cross-polarization illuminations were implemented to obtain multidimensional images.
Principle Component Analysis (PCA) and clustering analysis were applied to process the results.
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