Irregular MultiFocal Reflector for Efficient mmWave Propagation in Indoor Enviroments

Abstract

In future implementations of 5G systems , it is essential the use of the spectrum in the range of mm-Waves frequencies , in order to offer to the users the bandwidth proposed in the standard. However , using this frequency range lead to many technical difficulties in which the most important challenge is the critical attenuation of the signal in non-line-ofsight (NLOS) environments in indoor environments. Therefore is essential to plan strategies that allow us to mitigate the problem of signal attenuation in this kind of complex environments and ensure the viability of using this technology in short term. Then the objective of this research is the design of a passive reflector that allow us to redirect the energy of the transmitting antenna efficiently in order to avoid the obstacles of the environment , and therefore avoid excessive losses .

Holistic Enlightening of Blackspots With Passive Tailorable Reflecting Surfaces for Efficient Urban mmWave Networks

“…We point out that the authors in [41] have illustrated that broader beams may be generated in a parametrizable way by adding concave or convex features to the module surfaces in Fig. 3.…”

“…The costs may only be lowered further by removing the need for dipoles and special substrates as enabled by our proposed approach. Moreover, whereas the passive reflector in [39] exhibits a narrow beam, diffuse reflectors have already been proposed in the literature [41,42]. Whereas the previous works do not consider multi-beam capabilities as illustrated in [43], this could be achieved by combining two differently configured passive reflectors.…”

“…We note that a similar design of repeated modules has already been contemplated in [41] with the requirements of being periodic, symmetric, parametrizable, but was discarded due to self-shadowing-based inefficiency. This decision was not based on a detailed study and made despite proposing the option that N − 1 gaps could be introduced between the HELIOS modules.…”

Wireless Communication Using Metal Reflectors: Reflection Modelling and Experimental Verification

“…It is observed from (15) and (17), that the maximum reflection direction of metal plates also depends on the polarization angle of the incident wave, rather than always occurs exactly at the specular reflection direction with θ r = θ t .…”

“…1. For instance, fully passive metal reflectors can be used for indoor communication improvement [6]- [8], millimeter-wave (mmWave) signal coverage enhancement [9]- [14], and energy redirection [15]. Compared to the extensively studied semi-passive techniques like intelligent reflecting surfaces (IRSs) -assisted communications [16]- [18], though metal reflectors cannot achieve dynamic reflection, they possess many attractive advantages, including zero energy consumption, ultra low cost, signaling-…”