Cloak Imperfect: Impedance

TL;DR

This paper explores how changing impedance matching criteria affects the scattering behavior of transformation devices, using theory and simulations to understand impedance rescaling effects in cylindrical geometries.

Contribution

It introduces a method to analyze impedance effects on scattering in transformation devices, with insights applicable to various geometries and device complexities.

Findings

Impedance rescaling significantly alters scattering properties.

Impulsive inputs help distinguish scattered from non-scattered fields.

Lessons extend beyond cylindrical geometries.

Abstract

I investigate the scattering properties of transformation devices as the traditional impedance matching criteria are altered. This is demonstrated using simple theory and augmented by numerical simulations that investigate the role of impedance rescaling. Results are presented for transformation devices in a cylindrical geometry, but the lessons apply to both simpler and more complicated transformation devices. One technique used here is the use of impulsive field inputs, so that scattered fields are more easily distinguished from non-scattered fields.