|CAICEDO MEJILLONES STEVEN KLEBER||Cycle: XXXIV |
Tutor: RIVA CARLO GIUSEPPE
Advisor: D'AMICO MICHELE Major Research topic
:Millimeter Wave Filter/Antenna Technologies for 5G communications networksAbstract:
5G technology is coming and it is 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. 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.
On the other hand, with the advent of different 5G solutions and the massive deployment of IoT, the need for highly selective filters also arises. With size as a constraint in many applications (e.g. PAA for FDD applications), the introduction of several finite transmission zeros may be necessary. This conversely often leads to intricate topologies and therefore more complicated implementation and tuning. Extracted-pole and cascaded-blocks are modular topologies that can overcome all of these issues, allowing to design even fully canonical filters. Along these lines, during my PhD, it is expected to develop new filter synthesis techniques that are more accurate, completely analytical, and that extend the features of what is in the state-of-the-art.The perspective objectives of the PhD research can be thus summarized as follows:
- 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.
- Novel filter synthesis techniques for cascade-block and extracted-pole filters.