This paper presents a parametric study of classical additive 3D-printing settings for use on conductive filaments in applications for high-frequency topologies. First, a wideband characterization was conducted, printing a microstrip transmission line using a conductive filament with variations of typical 3D-printing settings, such as layer height, infill percentage, and infill pattern. The measurement results show a dependence on the high-frequency transmission parameters with respect to the infill percentage and the infill pattern. Finally, two antennas were 3D-printed using conductive material, a microstrip patch, and a low-weight pyramidal horn antenna. The results for the patch agree with the losses found on the line measurements, while the low-weight pyramidal horn exhibits no major differences compared with its equivalent antenna, made using perfect conductors.INDEX TERMS 3D-printing, wideband characterization, 3D-printed antennas, conductive PLA.

In this paper we propose two new spectrum allocation (SA) algorithms called Best Fit (BF) and Bit Rate-Aware (BRA), which are applicable to elastic DWDM optical networks under dynamic operation. In addition, we propose a new performance evaluation metric called spectrum fragmentation index, complementing the traditional analysis based on the blocking probability of connections. It evaluates and compares the performance of the algorithms through simulation. The results show that the proposed algorithm BRA presents the best performance compared with the most algorithms cited in the literature.

This paper gives a brief introduction to noise development in switched reluctance machines (SRMs) and presents psychoacoiustic quantities that allow an objective eva.luation of their sound qua.lity by taking into accouLnt the charcteristics of the human hearing system. The relevance of these quantities is deteined by listening tests and statistical analyses. The goal of this work is to demonstrate that a scceessfLl acoustic optimization of a SRM should be petformed based on both technical and psychoa.coustic know-how. 12K 2005 -I2're.xkn ISBN PH FINCIRUTHl Sbas&t DEl 2005 -L)i--;c11i ISBN :90-75815-08-5 P.7X HIE 2005 -. PS.

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