Borut Lampret | Searcharxiv

arXiv2025

5-axis Multi-material Desktop Additive Manufacturing of Conformal Antennas

This paper describes the novel use of low-cost, 5-axis, multi-material additive manufacturing to fabricate functional, complex conformal antennas. Using a customised open source 5-axis desktop printer incorporating conductive filaments, conformal S-band patch and Ultra-Wide Band antennas were fabricated and compared against planar-printed counterparts and electromagnetic simulations. Results show the potential of the approach for superior impedance matching, reduced fabrication time, and cost savings; highlighting the applicability of multi-axis multi-material prototyping of antennas with complex geometries.

cs.ET↗

arXiv2019

Evolution of nematic and ferromagnetic ordering in suspensions of magnetic nanoplatelets

Suspensions of magnetic nanoplatelets in isotropic solvents are very interesting examples of ferrofluids. It has been shown that above a certain concentration ΦNI such suspensions form a ferromagnetic nematic phase, which makes this system a unique example of a dipolar fluid. The formation of a nematic phase is driven by anisotropic electrostatic and long-range dipolar magnetic interactions. Here, we present studies of the evolution of short range positional and orientational magnetic order in the suspensions with volume fractions below and above ΦNI, using small angle neutron scattering (SANS). The results show that in the absence of an external magnetic field, short range positional and orientational order already exist at relatively low volume fractions. Polarized SANS revealed that the contribution of ferromagnetic ordering to the formation of the nematic phase is significant. The ferromagnetic correlations can be qualitatively explained by a simple model, which takes into account anisotropic screened electrostatic and dipolar magnetic interactions.

cond-mat.soft↗