Section: Telecommunications Tutor: RIVA CARLO GIUSEPPE Advisor: D'AMICO MICHELE
Major Research topic: Millimeter Wave Antenna Systems/ Technologies for 5G communications networks
5G technology is coming and it's expected to provide data to a larger number of users, with higher data rates in relation with previous generations. In order to improve data rates it is necessary to increase the spectral efficiency of the system, but also the supported bandwidth. This directs the view to the millimeter wave bands (20-300 GHz), where it is possible to find available bandwidth in the order of a few GHz.
Millimeter wave bands bring new challenges because of the high losses due to free space propagation, blockage, rain and atmospheric attenuation. However, since the wavelengths are in the order of millimeters, the aforementioned impairments can be overcome with the use of arrays of large number of antennas with beam-steering and beam-forming capabilities. For these reasons the antenna takes an important role in the performance of near-future wireless networks.
In 5G networks the use of antenna arrays is not only foreseen in the mobile wireless access, but also in the wireless back-haul and the fixed wireless access.
My PhD research will be focused on point-to-point (P2P) communications for wireless back-haul and point-to-multi-point communications for fixed wireless access (FWA).
Regarding P2P, the use of Frequency Division Duplexing (FDD) will be addressed, where one of the challenges to face is the isolation between transmitter and receiver (possibly separate arrays for transmitter and receiver); the integration of low-order filtering function with basic radiator or tile will also be addressed. The design will consider single beam with steering and notch-placement.
Regarding FWA, Time Division Duplexing (TDD) poses different challenges and the choice between separate arrays for the transmitter and the receiver or a switch will be studied, the integration of low-order filtering function with basic radiator or tile will also be addressed. The design will consider multi-beam (beam-forming) for supporting multiple users.
The perspective objectives of the PhD research can be thus summarized as follows:
Design of a suitable radiating element to provide relative bandwidth greater than 2%, supporting dual-linear polarization and with directivity compatible with the required steering angles.
Algorithm to co-design antenna and filter (filt-enna)
According to the feasibility, extend the basic tile to one of the three tracks below by simulation or theoretical arraying:P2P Array:
Integrable with the current commercial backhauling microwave products as replacement of current P2P antennas.P2P 360°-steering array:
Integrable with the current commercial backhauling microwave products as replacement of current P2P antennas which could make possible a smart-back-haul with SDN reconfiguration.
FWA 360°-steering array: Antenna with multibeam capabilities and covering 360° of steering angles.