Programa del congreso

In this work the wireless channel between 110 and 170 GHz has been measured using a vector network analyzer and virtual arrays in an indoor environment and in a line-of-sight situation. The path loss and root mean squared of the delay spread have been extracted from the measurements at different locations for the whole and for several sub-bands: 130-134 GHz, 141-148.5 GHz, 151.5-164 GHz. The floating-intercept model of the path loss has been obtained for all cases and the trend of root mean squared of the delay spread respect the distance has also been estimated.

This paper presents a modified ridge-gap waveguide capable of attaining highly dispersive wave propagation. This new waveguide allows the design of leaky-wave arrays with a fast frequency-scanning rate. The modification involves inserting deep corrugations into the central ridge, which enforce the slow-wave regime and enhance the slope of the phase constant with respect to frequency. Based on this new waveguide, a design example of a linear shunt slot array has been proposed. Consisting of a relatively simple structure, it can cover a field of view of +-30º within a 1-GHz bandwidth. These results confirm the promising properties of the proposed waveguide for designing backward-to-forward fast-scanning all-metal leaky-wave arrays in the millimeter-wave band

he increasing demand for high-performance

wireless communications in vehicular environments has led to

the development of massive MIMO (mMIMO) systems to

enhance capacity and spectral efficiency. This paper

investigates the impact of different MIMO antenna

configurations in vehicular scenarios, focusing on their effect on

system capacity and correlation properties. A measurement

campaign was conducted using the MaMIMOSA massive

MIMO channel sounder at 5.89 GHz with 80 MHz bandwidth.

The analysis considers various receiving antenna

configurations, including omnidirectional and directive patch

arrays, placed on a vehicle moving under line-of-sight (LOS)

and non-line-of-sight (NLOS) conditions. The results highlight

the influence of antenna selection on the achievable capacity,

spatial correlation, and the overall performance of vehicular

mMIMO systems. The findings contribute to optimizing

antenna designs for 5G and beyond vehicular communication

systems.

EM waves carrying orbital angular momentum (OAM) have been investigated in relation to its generation and transmission, with increasing interest in their usage and integration into modern communication systems. In the radio domain, the employment of a uniform circular array (UCA) featuring a consistent phase shift between neighboring elements is the most common technique employed in the literature to generate OAM carrying waves. Although offering an under-standable solution, the consistent phase shift may not guarantee pure OAM generation and isolation between the different modes when interested on capacity increase with orthogonal multimodal solutions. In this work, the orientation of the elements in the antenna array is reviewed concerning collinear and radial arrangements of its elements, briefly analyzing the generation and transmission performance of different OAM eigenmodes, prioritizing short-range communication use cases. With respect to the latter, this report also addresses considerations about the performance evaluation of different OAM modes in the absence of clear LOS visibility under the aforementioned geometries

Este artículo presenta el diseño de un sistema de antenas reconfigurable con capacidades de conformación y conmutación de haces para aplicaciones de comunicaciones móviles 5G en las bandas S y C. El conjunto propuesto está optimizado para cumplir con los exigentes requisitos de las actuales redes 5G, incluyendo altas velocidades de datos y baja latencia. Además, mediante el ajuste dinámico del diagrama de radiación el sistema permitirá apuntar el haz hacia usuarios específicos o mitigar interferencias. El conjunto puede utilizarse, en combinación con técnicas de conformación de haz adaptativas, para mejorar la cobertura y la fiabilidad de la señal en entornos urbanos densos, donde el mecanismo de conmutación de haz permite la gestión eficiente de los usuarios. Los resultados de la simulación muestran que la antena antena presenta una ganancia moderada en las bandas S y C, lo que la hace adecuada para su integración en estaciones base 5G. El trabajo proporciona una solución versátil para los sistemas de comunicación de próxima generación, contribuyendo al desarrollo de redes 5G más robustas y eficientes.