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This paper presents for the first time the complex dielectric permittivity and loss tangent measurements for a selection of advanced polymer-based thermoplastics in the Q-band, V-band and W-band frequencies. These plastics are reported to have exceptional mechanical, thermal and electrical properties and are extensively used as electrical insulating materials, often operating at high voltages. With...
This study investigates the effect of polarization on the dielectric measurements of pesticide. Dispersive Fourier Transform Spectroscopy was utilized to measure the absorption coefficient and refractive index from 180 to 420 GHz. Variations in the results due to polarization and birefringence were investigated by calculating the average value, standard deviation and percentage variations in dielectric...
This paper presents the first step in characterizing and detecting common household powders as hoax materials by investigating their broadband dielectric characteristics. Pesticide is also studied due to its similarities to anthrax. A modified two-beam polarizing interferometer and custom-made sample holders were utilized to obtain the refractive index (RFI), absorption coefficient, complex real and...
The present paper reports the first step towards detecting and characterizing both the single-and multi walled carbon nanotubes using microwave frequencies. The dielectric properties for these nanostructured carbon materials are measured using the rectangular waveguide technique and are determined in the frequency regime ranging 8-40 GHz. The data is represented in terms of dielectric constants and...
Broad-band millimeter wave transmittance measurements of normal and tumorous (cancerous) human breast tissue samples have been acquired in-vitro by employing a free-space, quasi-optical spectrometer. Freshly excised breast tissues were prepared and preserved in 10% neutral-buffered formalin solution before testing. Significant differences in the transmittance profiles have been found between the normal...
High resolution millimeter and submillimeter wave measurements of solids and powders are very difficult to acquire and have taken on a growing significance for security reasons. Utilizing a two-beam polarizing interferometer, the dielectric properties of household powders were obtained through Dispersive Fourier Transform Spectroscopy. The refractive index, absorption coefficient, real and imaginary...
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