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This paper builds on a new technology that embroiders conductive coated polymeric fibers (e-fibers) on polymer-ceramic composites to realize conformal, load bearing antennas and RF structures. Indeed, electrically conductive fibers, comprised of thin metal coated polymer strands (Zylon, Kevlar etc.), are extremely flexible. They are also easy to be stitched onto polymer substrates to form an embroidering...
We presented a novel process for constructing high conductivity CNT surfaces. This is done by growing high density CNTs on light-weight and highly flexible polymer substrates. The proposed vertically aligned CNT printing technology can also be adapted for constructing flexible RF circuits integrated on a variety of commercial and defense related applications. Given the desirable RF and mechanical...
Many mobile structures (aircrafts, ships and automobiles) require conformal antennas for high data rate connectivity, which brings the need for material compatibility and for structurally reinforced antennas. The latter requirement is particularly challenging for small platforms since a large antenna is needed at these frequencies. For small unmanned air vehicles (UAVs) spanning a few feet, it is...
We presented carbon nanotube coated conductive textiles and polymer-ceramic composites for novel load bearing antennas. We showed that the polymer-ceramic composite exhibits high permittivity with very low loss tangent depending on the ceramic-polymer mix ratio. We also discussed that conductive textile coated with carbon nanotubes and gold carry very promising features to achieve high conductivity...
Through-wall radar imaging has received much attention recently for discerning objects inside of a building. Most conventional imaging approaches are based on Fourier spectral transforms and/or far-field approximations, such as inverse synthetic aperture radar (ISAR) and tomographic imaging. These methods assume a simple point-scattering model. On the other hand, model-based imaging is a more general...
In this paper, hybrid S-matrix approach is demonstrated for relatively complex EMI/EMC problems involving cavity-cable-PCB interactions. The purpose of these simulations is to validate the hybrid S-matrix formulation for EMI illuminations other than plane waves. Consequently, the PCB and cables are placed inside a resonant cavity, thereby exposing system ports to the cavity fields. As demonstrated...
We demonstrated that existing wall models for brick walls are not accurate at high frequencies, particularly for relatively new wireless services. Herewith, we proposed a semi-analytical model to numerically extract equivalent tensors for brick walls that remain valid at higher frequencies (beyond 1GHz). More details and results on our proposed model will be presented at the conference.
A computationally efficient method for field coupling on multiconductor transmission lines near complex structures is proposed. Key to the method is the decomposition of the current on each transmission line into push-push and push-pull mode currents. The former accounts for the interactions between the transmission line bundle and the surrounding structure, whereas the latter corresponds current...
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