Noise Figure of a Unidirectional Cloaking Circuit Based on Parity-Time Symmetry

One-way or unidirectional cloaking is realized in RF circuit design using active and passive components that are linked together in parity and time-reversed pairs otherwise known as parity-time symmetry. Such systems provide cloaking and reflectionless transmission properties at the exceptional point where loss and gain of the system are exactly balanced. Here, we estimate the noise figure of a two-port unidirectional cloaking circuit (unit cell) and the impact of noise figure on the radar cross section of a cloaked object.