Wave Front Shaping in Quasi-One-Dimensional Waveguides

TL;DR

This paper demonstrates wave front shaping in a quasi-one-dimensional waveguide using multiple antennas with adjustable amplitude and phase, enabling control over propagating modes even after scattering events.

Contribution

It introduces a method to shape incident waves in a multi-mode waveguide using an array of antennas with broad-band IQ modulation, allowing precise mode control post-scattering.

Findings

Able to generate any combination of propagating modes

Wave shaping persists despite scattering in the waveguide

Demonstrates control over wave transport in complex environments

Abstract

Using 10 monopole antennas reaching into a rectangular multi mode waveguide we shape the incident wave to create specific transport even after scattering events. Each antenna is attached to an IQ-Modulator, which allows the adjustment of the amplitude and phase in a broad band range of 6-18 GHz. All of them are placed in the near field of the other, thus the excitation of an individual antenna is influenced by the presence of the other antennas. Still these 10 antennas are sufficient to generate any combination of the 10 propagating modes in the far field. At the output the propagating modes are extracted using a movable monopole antenna that is scanning the field. If the modes are scattered in a scattering region, the incident wave can be adjusted in such a way, that the outgoing wave can still be adjusted as long as localization is not present.