OAM multiple transmission using uniform circular arrays: numerical modeling and experimental verification with two digital television signals

TL;DR

This paper demonstrates real-world radio-frequency OAM transmission using uniform circular arrays, combining numerical modeling and experimental verification with digital TV signals at 198.5 MHz, showing effective mode insulation and practical feasibility.

Contribution

It provides the first experimental validation of OAM multiple transmission with uniform circular arrays for digital TV signals, supported by comprehensive numerical and real-world testing.

Findings

Successful OAM transmission at 198.5 MHz with digital TV signals

Good mode insulation between different OAM modes

Numerical models align with experimental results

Abstract

In this work we present the outcomes of a radio-frequency OAM transmission between two antenna arrays performed in a real-world context. The analysis is supplemented by deep simulative investigations able to provide both a preliminary overview of the experimental scenario and a posteriori validation of the achieved results. As a first step, the far-field OAM communication link is tested at various frequencies and the corresponding link budget is studied by means of an angular scan generated by the rotation of the receiving system. Then, on the same site, two digital television signals encoded as OAM modes ($\ell$=1 and $\ell$=-1) are simultaneously transmitted at a common frequency of 198.5 MHz with good mode insulation.