Browsing by Author "Arnieri, Emilio"

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    Radianting elements for 5G Backhauling Systems
    (Università della Calabria, 2021-09-09) Mustacchio, Carmine; Crupi, Felice; Arnieri, Emilio
    5G will have to support a multitude of new applications with a wide variety of requirements, including higher peak and user data rates, reduced latency, enhanced indoor coverage, increased number of devices, and so on. These aspects will lead to a radical change in network architecture from different points of view. For example, the densification of small cells produces massive backhaul traffic in the core network, which inevitably becomes an important, but somewhat less addressed bottleneck in the system. In particular, millimeter waves (mm-waves) bands, due to their large unlicensed and lightly licensed bandwidths, have become a promising candidate for the next-generation wireless communications, to accommodate users demand for multi-Gbps data rates, but this will move the attention to the complexity, the criticality and the infrastructure costs of backhauling antennas. In fact, because of the losses produced by the increasing frequency, it will be necessary to use antennas with reconfigurable directional links and, where necessary, to enable the use of massive MIMO architectures. Among the spectrum portions, the E-band and W-band are the most interesting and attractive. In fact, the unlicensed frequencies in many geographic areas will allow to reduce the operators' costs at the same bit rate. Furthermore, the directive beam steering antennas will allow the capability of spectrum reuse in the same cell. However, there are different unresolved problems, due to the need to use antennas with electronic reconfigurable beam steering both in azimuth and elevation. The spread of this kind of radiator, on a large scale, will require, necessarily, the development of new antennas that will be able to reduce manufacturing and integration costs. The main object of this work is to investigate and develop different types of new antennas, which will be able to satisfy all backhauling systems requirements for 5G applications. The research activities presented in this dissertation can be summarized into three parts. In the first part, a beam-switched Cassegrain reflector antenna in E-band (71-86 GHz) for backhauling systems for 5G applications is presented, including the study of different feeding elements which will illuminate the double reflector system. This antenna has been thought to reconfigure the beam compensating small boom movements, which are estimated to be within ±1° in both azimuth and elevation planes. After evaluating all the possible solutions, an array of magneto-electric dipoles has been selected as feeding element for the E-band beam-switched Cassegrain antenna. In the second part, the attention has been focused on the study and the design of antennas on-chip (AoCs) in a standard 0.13 μm SiGe BiCMOS technology. In particular, two new techniques for enhancing the gain of on-chip monopole antennas in W-Band (75-110 GHz) are proposed. These new proposed methodologies involved the use of a new AMC (Artificial magnetic conductor), composed by some SRRs (Split ring resonators) and LBE (Localized Backside Etching), and some capacitively loaded SRRs. In the last part, a I/Q phase shifter design in E-band (71-86 GHz) in a SiGe BiCMOS 55 nm semiconductor technology is proposed. The proposed phase shifter is a sub-block of a compact E-band I/Q Receiver in SiGe BiCMOS for 5G backhauling applications.
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    SiGe BicMOS Building Blocks for 5G Applications
    (2019-01-18) Calzona, Domenico; Crupi, Felice; Boccia, Luigi; Arnieri, Emilio
    SiGe BiCMOS semiconductor technology has been increasing its application domain especially for the development of complex microwave monolithically integrated circuits (MMIC) required for modern telecommunication systems. This thesis presents a set of building blocks developed in different SiGe BiCMOS technologies for reconfigurable antenna applications. The developed blocks are oriented to the implementation of electronically scanned phased arrays or of switched beam antenna systems. The red thread that links the different topics is the next generation mobile communication systems, namely 5G systems. However, 5G networks instead of providing specific requirements for each block are employed as an application context that is adopted to provide a real employment scenario for each device proposed in this work. The thesis is organized as follows. In the first chapter, an overview about development opportunities of 5G technology is illustrated. In the second chapter, a brief introduction in the world of MMIC and SiGe technology has been provided. In the third chapter, beam-forming networks are dealt introducing the design of an 8x8 Butler matrix and a Wilkinson combiner/divider in SiGe BiCMOS technology. In the fourth chapter, a quarter wavelength resonant filter phase shifter is presented. An innovative technique to realize a phase shifter using the peculiarity of the pass-band filters. In the fifth chapter, it is presented a study on metamaterial structures based on Split Ring Resonators integrated with on-chip Coplanar Wave guides. In the last chapter, a FDD technique is illustrated along with the design of a Duplexer in K/Ka-band with High/Low pass filter.