Characterization of GaN/AIN films with different polarities grown by molecular beam epitaxy on sapphire substrates

Wurtzite Ill-nitrides crystallize uniaxially and non-center-symmetrically. They exhibit large spontaneous and strain-induced polarization effects [1]. The large amount of polarization charge appearing at their heterointerfaces and the strong electric fields associated with it is unique to Ill-nitride heterostructures and has a dramatic effect on their optical and electrical properties. When a GaN film is grown on the c-plane of sapphire substrates by molecular beam epitaxy (MBE), it does not ...

Nutritional and Antioxidant Value of Horticulturae Products

Permittivity-Customizable Ceramic-Doped Silicone Substrates Shaped with 3-D-Printed Molds to Design Flexible and Conformal Antennas

3-D-Printing in antenna design is a recent research branch which is attracting academic and industrial interest. Nevertheless, despite the advantages in terms of antenna customizability, common filaments exhibit limitations in some contexts where platform tolerability, flexibility, and compactness are simultaneously required. Indeed, other than a rather low permittivity of commercial 3-D-printable materials, when flexibility is required, also significant loss tangent values must be accounted....

Designing UHF RFID tag antennas with Barcode shape for dual-technology identification

In this paper, a novel methodology to design Ultra High Frequency Radio-Frequency IDentification (UHF RFID) tag antennas with Barcode layout is proposed with the challenging goal of "fusing" both technologies in a single device. Specifically, after a brief recall of the well-known barcode standard, a procedure to design meandered barcode-shaped UHF RFID tags is introduced and discussed leveraging on electromagnetic evidence. The main steps of the proposed method are described by highlighting ...