| Abstract [eng] |
World mobile data traffic is growing nearly exponentially. Available bandwidth is one of the factors limiting data transmission rate. Current wireless technologies, coupled with the newest 5G technology, is expected to meet only 81 percent of the planned need. One of the promising candidates is the Terahertz (THz) Band (100 GHz – 10 THz), but the THz waves are very vulnerable in the atmosphere. In this work, the possibilities and limitations of the THz wireless networks were examined in terms of the atmospheric attenuation, mostly rain attenuation and variations of atmospheric refractive index. Also, one of the most probable technological scenarios (short distances and quasi-optical transmission) was investigated. The results were compared with data from a laboratory-controlled rain experiment. In order to overcome small gain of individual THz Band antennas, very large antenna arrays might be required. The zone plate-based antennas are considered as a reduced size and cost, easy-integrated planar solution for telecommunication systems in THz bands. Therefore, the zone plate design, in which reflection-reducing and focusing features are compatible on one 500 µm thick silicon substrate, was consistently optimized and produced using laser-ablation. Focusing performance of the binary zone plate for 0.6 THz with dual function antireflective layer was close to diffraction limited operation. |
