A Leaky Wave Antenna made of Two TLs With Exceptional Point Degeneracy

We show for the first time the concept of a second-order exceptional point of degeneracy (EPD) in a leaky wave antenna (LWA) coupled to a passive waveguide. The LWA system is modeled as a transmission line (TL) with a shunt conductance representing distributed radiation, coupled to a second lossless and gainless TL. This system allows for an EPD with five degrees of freedom. The LWA working at an EPD frequency is exceptionally sensitive to system’s perturbations. Here we focus on the case that is fully passive, with loss representing radiation, but also the PT symmetric case, where the coupled TL has distributed gain, will be discussed during the presentation.