Indoor Propagation of Electromagnetic Waves with Orbital Angular Momentum at 5.8 GHz

Abstract

Propagation of electromagnetic waves with orbital angular momentum (OAM) is investigated in indoor environments. The OAM modes generated by circular patch array antennas are used. With proper alignment and suppressed multipath, the OAM modes can transport multiple wireless data stream at the same time. Through measurements and ray-tracing simulations, it is found that the advantages of OAM modes are limited if those two conditions are not satisfied. It is also found that multipath effect can be enervated by using narrow beam antennas.

Study on the Appropriate Measurement Spacing for EMF Installation Compliance Assessments of a 3.5 GHz 5G Base Station

“…This software is based on the ray frustum algorithm [23] for a computational acceleration, which originates from computer graphics and visualization [24], [25]. The ray-frustum-based tracing has also been considered to predict the propagation characteristics of the 5G MMW channel [26], [27] and the orbital angular momentum waves [28] in efficient way.…”

Orbital Angular Momentum Multiplexing in Highly Reverberant Environments

“…Only a few of studies have considered OAM transmission in multipath environments. For example, OAM communication has been investigated in an indoor environment [10], where it was found that the OAM communication was sensitive to antenna misalignment and multipath. The multipath effect of specular reflection on OAM communication was studied in [11], where it was shown that higher OAM modes suffer more crosstalk.…”