Papers by Roberto Ravanelli
The congestion of the radio frequency bands imposes serious limitations on the capacity and capab... more The congestion of the radio frequency bands imposes serious limitations on the capacity and capability of modern wireless information infrastructures. One approach to enable frequency re-use is to exploit other physical conserved quantities of the electromagnetic fields, such as the angular momentum in addition to linear momentum, exploited in presentday telecommunications. Whereas in the optical regime the increase of channel capacity by using orbital angular momentum (OAM) states was demonstrated recently, the receiving antennas in commercial radio links have a much smaller extent than the transmitted beam, making the signal reception and characterization of the OAM state demanding. Moreover, radio data transmission with N channels per polarization state at the same frequency for radio links when N > 2 is known to be notoriously difficult to realize even with multiport techniques, long antenna baselines and digital post-processing. Here we report results from an outdoor experiment where the physical properties of OAM states were used to transfer information, using far-field multiplexing/demultiplexing of N = 3 coexisting, collinear, vertically polarized and mutually independent OAM radio beams, opening new perspectives in wireless telecommunications.
receiving his diploma in Industrial Electronics. Since then, he has held several positions in Ele... more receiving his diploma in Industrial Electronics. Since then, he has held several positions in Electronic Card Assembly and Test Engineering focusing on material sciences and related industrial processes. Over these years he had numerous foreign assignments and residencies in various IBM US labs. He has been involved
Organic packages for High Frequencies Applications are becoming a real need to meet cost/performa... more Organic packages for High Frequencies Applications are becoming a real need to meet cost/performance targets for Telecom applications and in growing sectors driven by higher frequency requirements. A study of foundamental properties required to an organic package to be implemented for these range of applications is presented. Some past experiences have demonstrated that with current designs and materials, performance in the 20GHz range are possible while applications at lower frequencies are definitively available. This paper will present how the current available technologies coupled with design techniques can be used to satisfy this kind of packaging requirements. High wireability packages engineered to address the ever increasing interconnection density for the digital world can be effectively used to address many of the critical analogue/high frequency requirements. Introduction Organic chip carriers packages are relatively new for high frequency applications. They are perceived...
In this paper we report the results from outdoor experiments showing that it is possible to incre... more In this paper we report the results from outdoor experiments showing that it is possible to increase the data transmission capacity using at least three coherent, orthogonal beams on the same frequency, 17.128 GHz, each in a unique orbital angular momentum state. Each beam was encoded with the digital modulations used in present-day telecommunications. We achieved an error-free throughput of 3 × 11 Mbit/s with four-Quadrature Amplitude Modulation over a 7 MHz bandwidth over 100 m and 150 m long links.
A short range experimental communication system, based on Orbital Angular Momentum (OAM) multiple... more A short range experimental communication system, based on Orbital Angular Momentum (OAM) multiplexing, is presented. We characterize circular arrays of patch antennas designed to transmit and receive OAM electromagnetic fields, reporting new results on communication links based on such antennas. We also experimentally study the antennas tolerance to misalignment errors (angular tilt and lateral shift) within which OAM multiplexing can be efficiently exploited. Starting from these results, we finally propose an application to short range communications of OAM-based systems that can lead to a high level of security in the information exchange.
arXiv: Optics, 2015
A short range experimental communication system, based on Orbital Angular Momentum (OAM) multiple... more A short range experimental communication system, based on Orbital Angular Momentum (OAM) multiplexing, is presented. We characterize circular arrays of patch antennas designed to transmit and receive OAM electromagnetic fields, reporting new results on communication links based on such antennas. We also experimentally study the antennas tolerance to misalignment errors (angular tilt and lateral shift) within which OAM multiplexing can be efficiently exploited. Starting from these results, we finally propose an application to short range communications of OAM-based systems that can lead to a high level of security in the information exchange.
AEU - International Journal of Electronics and Communications, 2016
2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC), 2015
IEEE Antennas and Wireless Propagation Letters, 2015
A short range experimental communication system, based on Orbital Angular Momentum (OAM) multiple... more A short range experimental communication system, based on Orbital Angular Momentum (OAM) multiplexing, is presented. We characterize circular arrays of patch antennas designed to transmit and receive OAM electromagnetic fields, reporting new results on communication links based on such antennas. We also experimentally study the antennas tolerance to misalignment errors (angular tilt and lateral shift) within which OAM multiplexing can be efficiently exploited. Starting from these results, we finally propose an application to short range communications of OAM-based systems that can lead to a high level of security in the information exchange.
IEEE Transactions on Antennas and Propagation, 2015
IEEE Antennas and Wireless Propagation Letters, 2015
2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC), 2015
Uploads
Papers by Roberto Ravanelli