Active Microwave Cloaking Using Parity-Time-Symmetric Satellites

Abstract

Electromagnetic cloaking is important in various microwave applications, such as stealth technology, interference reduction in multiantenna communication systems, and efficient energy harvesting. Fundamental limitations, though, hinder the operation bandwidth of passive cloaks as the size of the hidden object increases. Inspired by the concept of parity-time symmetry, researchers propose a realistic cloaking scheme based on $a\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}v\phantom{\rule{0}{0ex}}e$ circuitry, which enables a practically realizable, broadband microwave cloak that can satisfy the requirements of real-life applications.