In the frame of the French metrology organization, the laboratory Systèmes de Référence Temps-Espace (SYRTE) in Observatoire de Paris (OP) is in charge of fundamental activities in the time and frequency domain. Among other systems, the laboratory is...

This paper explores a new Ka and Q-band dry scintillation database and ancillary meteorological data collected at Aveiro, Portugal in two converging Earth-satellite propagation paths. The measurement equipment, the parameters of both links and the...

Future wireless communication systems will require large network capacities beyond the capabilities of present and upcoming 5G technology. The trend of considering higher frequencies for their large bandwidths continues today into the sub-THz domain....

Several frequency bands and system architectures are proposed for 5G and beyond to meet the higher data rates for point-to-point communication and point-to-area coverage. In this paper, we present radio propagation studies and models developed in...

Directional antennas are regarded as one of the key technologies to achieve higher signal quality and data rate. Evidence has shown that the directional antenna channel features can be very different from the omnidirectional ones. Therefore, it is...

Satellite communications have already started to employ mmWave bands such as the Ka-band (20/30GHz) for broadcasting and broadband services; Ka-band is used either for backhauling (feeder links) or direct-to-user services. To enhance the propagation...

​This study provides explicit mathematical formulations for the bi-static scattering coefficient from a randomly rough surface with a complex relative permittivity based on the following analytic models: Small perturbation model (SPM), Physical...