Experimental studies of PT-scattering in arrays of active $LRC$ elements*

One of the fundamental tasks in antenna theory is getting an antenna to radiate by removing mismatch losses between the loaded antenna and the transmission line that delivers the power. We will present experimental data suggesting that ${\cal PT}$-symmetric antenna structures, where active elements associated with the real part of impedance ($\pm R$) are involved, can lead to a broadband, reflectionless behavior. The suggested {\it optimal matching} strategy can potentially be superior to the existing one which uses active $LC$ elements in order to balance the reactance. Along these lines, we also envision antenna arrangements with unidirectional ultrafast communication capabilities, where the signal will transfer faster (or slower) between the active elements of the ${\cal PT}$-structure depending on the entrance point of the incident wave.