Use of additional transmitters for increasing detection range in harmonic radar

Since the mid-1970s, when the first papers about harmonic radars were published, the theory behind nonlinear radars has been extensively studied. New ways to measure the distance to targets of interest were proposed, new nonlinear elements for harmonic tags and different transmissions configurations were implemented. Despite this, one thing which still represents the bottleneck of the harmonic radars is their low range. The primary reason for the low range is the low power conversion efficiency of the passive nonlinear tag. There are many ways to improve the capacity of harmonic radars. In this paper, we focus on using additional transmitters.