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In the present work, the atomic and the electronic structures of Au3N, AuN and AuN2 are investigated using first-principles density-functional theory (DFT). We studied cohesive energy vs. volume data for a wide range of possible structures of these nitrides. Obtained data were fitted to a Birch-Murnaghan third-order equation of state (EOS) so as to identify the most likely candidates for the true...
A Ku-band cavity backed microstrip patch antenna sub-array suitable for dual linear/circular polarization is being developed based on substrate integrated waveguide (SIW) technology for DBS applications. SIW cavities have been emulated using vias and the patches are fed using microstrip line feed network. A 3??4 sub-array has been fabricated, tested and its results demonstrated a relatively high efficiency...
A low profile substrate integrated waveguide (SIW) 13times32 slot array antenna has been fabricated employing multi-layer printed circuit board technology. The introduction of multi-layer structures considerably reduced the overall height of the mobile antenna to about 3 in. and rendered a low profile antenna structure suitable for mobile DBS reception. On the top substrate layer in this well-developed...
Slot arrays fed with post-wall waveguides were fabricated using conventional printed circuit substrates. Side-walls of waveguides are emulated using rows of closely spaced vias. These arrays have been investigated and compared to the previously developed conventionally machined slot arrays that are defined on top of standard metallic waveguides. Fabrication costs of printed slot arrays are much less...
In this paper, measurements of a printed circuit slot array post-wall waveguide antenna at Ku band frequencies (12.2 GHz to 12.7 GHz) using a planar near-field range are described and results are presented here in details. It is shown that the planar near-field measurements provide complete characterization of the printed circuit slot array antenna. The measured beam tilt angle in elevation at 12...
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