Quasi-optics-inspired low-profile endfire antenna element

In this paper, the design, operational principle and experimental validation of an endfire antenna element that is inspired by the energy-focusing characteristics of graded-index optical fibre are presented. The antenna operates with a bandwidth of 1.5 GHz centred around 14 GHz. It has a gain of around 5.5 dBi along the band of interest and a good pattern stability over the band. The antenna derives its unique nature from the arrangement of the arc-shaped parasitics, that couple onto the antenna´s driver dipole. An electromagnetic refractive index retrieval mechanism is used to guide the placement of the parasitics to enhance the gain. In addition to the design principle, a parametric study of the main parameters and their influence on the antenna behaviour is presented. The antenna is a potential candidate for use in multi-user massive MIMO antenna arrays for 5G communications where space is premium and in antenna array applications where a low-profile antenna element with a high gain is a necessity.This work was supported by the 5G wireless project that has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 641985

Binary phase-controlled multi-beam-switching antenna array for reconfigurable 5G applications

The paper presents a two-phase state based multi-beam-switching scheme implemented on a customdesigned 4 × 4 antenna array operating with a bandwidth of 1.5 GHz around 14 GHz. The antenna array and the beam-switching scheme have been experimentally validated. A phasing network designed to produce two phase states is used to experimentally validate the beam-switching and five beam states are presented, though this can be extended to other configurations using the split beam as a building block to construct multiple beams. The antenna can find potential use in multi-user millimetre-wave massive MIMO scenarios which require simultaneous multiple beams along selective directions.This work was supported by the 5G wireless project that has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 641985 and by the University of Cantabria PAR project P111

State-of-the-art assessment of 5G mmWave communications

Deliverable D2.1 del proyecto 5GWirelessMain objective of the European 5Gwireless project, which is part of the H2020 Marie Slodowska- Curie ITN (Innovative Training Networks) program resides in the training and involvement of young researchers in the elaboration of future mobile communication networks, focusing on innovative wireless technologies, heterogeneous network architectures, new topologies (including ultra-dense deployments), and appropriate tools. The present Document D2.1 is the first deliverable of Work- Package 2 (WP2) that is specifically devoted to the modeling of the millimeter-wave (mmWave) propagation channels, and development of appropriate mmWave beamforming and signal processing techniques. Deliver D2.1 gives a state-of-the-art on the mmWave channel measurement, characterization and modeling; existing antenna array technologies, channel estimation and precoding algorithms; proposed deployment and networking techniques; some performance studies; as well as a review on the evaluation and analysis toolsPostprint (published version

Spatial modulation based on reconfigurable antennas: performance evaluation by using the prototype of a reconfigurable antenna

In this paper, we study the performance of spatial modulation based on reconfigurable antennas. Two main contributions are provided. We introduce an analytical framework to compute the error probability, which is shown to be accurate and useful for system optimization. We design and implement the prototype of a reconfigurable antenna that is specifically designed for application to spatial modulation and that provides multiple radiation patterns that are used to encode the information bits. By using the measured antenna radiation patterns, we show that spatial modulation based on reconfigurable antennas works in practice and that its performance can be optimized by appropriately selecting the radiation patterns to use for a given data rate

Propuesta de topologías de antena para sistemas de comunicaciones 5G

ABSTRACT: Following the forecasted manifold increases in cellular traffic for 5G over the next five years as detailed in the CISCO VNI 2017 report, methodologies for the design of three antenna topologies operating at 14 GHz, 28 GHz and 31 GHz - one each in the domain of Massive MIMO, Single RF MIMO and Millimeter wave - are proposed in the thesis. A unique low-profile quasi-optic end fire antenna element and its 4x4 Massive MIMO sub-array operating over a novel multibeam-switching scheme along with its use in Single RF MIMO application are presented. Moreover, for application in small cell scenarios at Millimeter Wave band, an all-metal multibeam waveguide lens antenna is proposed that projects multiple high directional beams of around 15 dBi over two bands centred at frequencies of 28 GHz and 31 GHz. The three manufactured prototypes have been experimentally validated and their application can be extended to several 5G use cases.RESUMEN: En línea con la previsión de crecimiento de varios órdenes de magnitud del tráfico celular para 5G en los próximos cinco años como se detalla en el informe CISCO VNI 2017, en esta Tesis se proponen tres topologías de antena operativas a 14, 28 y 31 GHz – orientas a aplicaciones Massive MIMO, Single RF MIMO y Millimeter-Wave. Se presenta un nuevo elemento cuasi-óptico de bajo perfil y con respuesta longitudinal, un subarray 4x4 del mismo operando con un nuevo esquema de conmutación de haces múltiples para su empleo en Massive MIMO junto con su adaptación para su empleo en sistemas Single RF MIMO. Por otra parte, para aplicación en celdas de reducido tamaño en bandas milimétricas, se propone una antena mutihaz de lente en guía, completamente metálica, que proyecta varios haces direccionales de aproximadamente 15 dBi en dos bandas centradas a 28 y 31 GHz. Los tres prototipos fabricados han sido validados experimentalmente y su aplicación puede extenderse a varios casos de uso en 5G.My special thanks to H2020 Marie Curie 5Gwireless project and the project coordinator Prof. Marco Di Renzo for his constant support and encouragement throughout the project