A more efficient use of available spectrum does not suffice to reach the ultra-large bandwidths (BWs) required by wireless systems beyond 5G, and the use of frequencies in the Terahertz (THz) gap is the key to enable ultra-large BW wireless. The frequency range between 275 and 350 GHz is particularly convenient, owing to the following advantages: a) it has not yet been allocated; b) it presents atmospheric attenuation windows, which enable mid-range links and small cell deployment; c) the short wavelengths favor the design of on-chip antennas, integration and packaging; and d) THz links are less susceptible than optical wireless to air turbulence and humidity, fog, smoke, and rain.
One of the challenges in THz wireless communications consists in designing low-profile high-gain antennas efficiently coupled to continuous-wave THz sources at room temperature, to compensate for the propagation loss. Moreover, appropriate radiation patterns must be tailored for the antennas in each THz wireless system. For instance, directive pencil beams will suffice for point-to-point links, whereas small cells will demand a multi-beam system with broader angular coverage.
This PhD offer is available at the Institute of Electronics and Telecommunications of Rennes (IETR), France.
All information about objectives and required skills can be found in this document.