First experimental demonstration of an isotropic electromagnetic cloak with strict conformal mapping

TL;DR

This paper reports the first experimental realization of an isotropic electromagnetic cloak using strict conformal mapping, demonstrating broad bandwidth and effective cloaking with dielectric materials, overcoming limitations of previous quasi-conformal designs.

Contribution

It introduces a novel isotropic cloaking device based on strict conformal mapping, improving cloaking performance and broadening operational frequency range.

Findings

Effective cloaking demonstrated through microwave near-field measurements

Device exhibits broad frequency response

Uses dielectric materials with constant greater than unity

Abstract

In the past years quasi-conformal mapping has been typically used to design broadband electromagnetic cloaks. However, this technique has some inherit practical limitations such as the lateral beam shift, rendering the device visible or difficult to hide a large object. In this work we circumvent these issues by using strict conformal mapping to build the first isotropic cloak. Microwave near-field measurement shows that our device (with dielectric constant larger than unity everywhere) has a very good cloaking performance and a broad frequency response. The present dielectric approach could be technically extended to the fabrication of other conformal devices at higher frequencies.