A compact in-metal UHF RFID tag for identification of metal components is described. The radiating element is printed on a 23×23×1 mm 3 copper-clad Alumina (Al2O3) substrate (r=9, tan=0.0003) and consists of two rectangular quarter-mode patch antennas properly arranged to make the tag performance as robust as possible even when the tag is embedded in small cavities carved out of metal objects. The entire structure has been optimized by taking into account the presence of a thin superstrate of commercial epoxy resin used to protect the tag. The effect of the cavity size on the tag performance is numerically analyzed. Measurements on a tag prototype are also described and discussed.

A low-profile and compact 3D antenna operating at LTE, GSM and UMTS frequency bands (790-2690 MHz) is proposed for a vehicular 2×2 MIMO system. The performance of the single 3D radiating element is here analyzed. Then, the two-antenna system performance is analyzed in terms of impedance matching, isolation and envelope correlation coefficient, highlighting the effect of some geometrical parameters such as inter-element distance and reciprocal orientation. Preliminary measured results are presented

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A novel compact 3D antenna operating at LTE,\ud GSM and UMTS frequency bands (790-2690 MHz) is proposed\ud for vehicular applications. The antenna consists of a metal-sheet\ud properly cut and shaped to fit an overall volume of 50×50×30\ud mm3. A Planar Inverted-F Antenna is designed to cover the lower\ud frequency band (below 1GHz), while an integrated folded\ud monopole adds higher frequency resonances. An elliptical-shape\ud pin is connected to a 50 input port to improve impedance\ud matching, mainly at the higher frequencies. Preliminary\ud numerical simulations in terms of reflection coefficient and gain\ud are here presented and discusse

A back-to-back Vivaldi Antenna is here proposed for a novel Vehicle to Infrastructure (V2I) communication system in the X-band (8.5-11GHz). The antenna has to be compact and low-profile in order to be installed on the car's roof. To cover the entire operating band, an ultra wideband (UWB) Vivaldi antenna has been chosen. Since the antenna has to radiate both in front and rear car driving direction, an array of two Vivaldi antennas has been designed, in a back-to-back configuration. Moreover, to attenuate the field radiation in the transversal direction - so decreasing the multipath effect due to the presence of buildings - the two antennas are fed with out-of-phase currents by means of a wideband hybrid T-junction. Finally, to further reduce the overall antenna size, the presence of the metallic car roof can be exploited to split the antenna size in half