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We study the evolution of excitons and optical conductivity of ZnO films on two different substrates (Pt and quartz) using three different Cu doping concentrations known as Cu:ZnO. The concentrations used in this paper were 0% (pure ZnO), 2%, and 8% of Cu. The results show that the excitons are strongly observed in the ZnO film on quartz (ZOQ). However, they are significantly suppressed in the ZnO...
A thin SiO2 underlayer has been found to be effective to enhance the microwave properties of FeCoN films on mica substrates. In this study, the effect of SiO2 thickness on static and dynamic magnetic properties was studied. A 160 nm FeCoN film directly deposited on a mica substrate exhibited in-plane isotropy, accompanied by a large coercivity of 70 Oe. By inserting a thin SiO2 as the underlayer,...
A novel planar antenna with bowtie shape for ultra-wideband (UWB) applications is presented in this paper. The proposed coaxial fed antenna is created by printing a semicircle on both sides of the substrate with two squares etched from the top element and two semicircles etched from the ground respectively. The simulated and measured results have shown that the designed antenna covers the 3.1-10.6...
A simple planar helical antenna with multi frequency is proposed. The planar helical antenna is made by printed circuit board (PCB) with suitable size and bending helix disposed and integrated on the upper and bottom surface of the printed circuit board connected by the via-holes in the board. The antenna has compact size and superior performance compared with normal-mode helical antenna. In this...
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