In radar countermeasures, the terms jamming and deception are used to indicate the intentional emission of radio frequency signals whose aim is to interfere with the operation of a radar by saturating its receiver with noise or false information. Electronic radar jammers typically consist of an antenna system and a corresponding circuitry, that captures, elaborates, and re-radiates the proper interfering signals. In this contribution, we present a radar jammer implemented through a time-modulated metasurface. Such a metasurface is an electrically thin artificial structure, whose properties are dynamically changed over time to realize an elaboration of the illuminating signal. We demonstrate that such a metasurface is able to jam Doppler radars, implementing sweep jamming and velocity pull-off techniques.
Ramaccia, D., Sounas, D.L., Alu, A., Toscano, A., Bilotti, F. (2020). Metasurface-based radar jammers and deceptors implemented through time-varying metasurfaces. In 14th European Conference on Antennas and Propagation, EuCAP 2020 (pp.1-2). Institute of Electrical and Electronics Engineers Inc. [10.23919/EuCAP48036.2020.9135780].