A textile, embroidered antenna, based on the fractal shape of the Sierpinski triangle, is designed in this paper for operation in the European free Industrial Scientific and Medical (ISM) 863–870 MHz band, as well as in the 902–928 MHz band designated for ISM applications in North and South America. Several prototypes have been fabricated by employing different stitch patterns and thread materials. The effect of the fabrication parameters on the performance of the proposed antenna is investigated through measurements and simulations, with the results being in good agreement. The antenna exhibits attractive characteristics such as wide bandwidth, relatively stable radiation patterns, as well as robustness in washing. Several tests reveal that convex and concave bent conditions do not affect the coverage of the aforementioned ISM bands, despite the shift of the resonant frequency in some cases. Moreover, the SAR values resulting from simulations are below the corresponding thresholds suggested by international guidelines.

This paper presents research focused on the development of a flexible fully printed IoT antenna for a drone-deployed autonomous sensor unit optimized for IoT applications. Aerosol Jet® was chosen as manufacturing technology. DuPont™ Kapton® HN 500 polyimide foil was used as a substrate. Conductive silver nanoparticle ink Clariant Prelect TPS50 was used for printing the antenna. Antennas were prepared with the different number of printed layers. A demonstrator with the fully printed flexible antenna was fabricated by Aerosol Jet printing technology and tested.

This paper presents a research focused on Aerosol Jet printed lines on subsequently bent glass substrates. The thin glass rods were used as the glass substrates. Three different patterns were printed by silver nanoparticle ink on the thin rods and the ink was sintered. The thin rods were bent in a flame in different angles after the ink sintering. The resistivity was measured before and after the bending and also the microscopic observation was realized in order to discover which of the printed patterns is the best for bending.