LTCC patch antenna array for 5G mobile applications featuring embedded air cavities

Microstructural Characterization and Self‐Propagation Properties of Reactive Al/Ni Multilayers Deposited onto Wavelike Surface Morphologies: Influence on the Propagation Front Velocity

“…[19] Therefore, in this study we focus on the effect of the substrate surface topography, on the morphology of the produced Al/Ni reactive multilayers with wavelike surface morphology (W-RMS), and on its consequent influence in the self-propagating reaction. In contrast to previous research, where the substrate presented structures in the order of micrometers and an isotropic surface texture, [17] in this work the surface of the copper substrate presents fine ridges or waves with a preferred orientation, which, despite their nanometric size, affects the growth of the Al/Ni layers and the propagation dynamics of the reaction. Besides, rolled copper foils are used as substrates because it is a competitive alternative to 2D fabrication methods, which are usually expensive and resource-intensive.…”

“…[ 16 ] Schultz et al recently showed the influence of the substrate topography on the propagation velocity by depositing RMS on low‐temperature co‐fired ceramic (LTCC) with previous surface modification. [ 17 ] The rough surface of the substrate affected the propagation velocity and improved the adhesion between the substrate and the multilayers after ignition. These effects can be interesting for bonding applications where slow propagation fronts are needed.…”