Vol. 95

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2022-05-22

Time-Reversal of Sub-THz Pulses in Complex Media

By Ali Mokh, Ramin Khayatzadeh, Abdelwaheb Ourir, Mohamed Kamoun, Arnaud Tourin, Mathias Fink, and Julien de Rosny
Progress In Electromagnetics Research B, Vol. 95, 141-162, 2022
doi:10.2528/PIERB22020405

Abstract

For the last 20 years, the time-reversal (TR) process has been successfully applied to focus pulses in the microwave frequency range and in complex media. Here we examine the specific conditions to obtain the same results but in the sub-THz frequency range. Because of the stronger attenuation at this much higher frequency, it is more challenging to exploit the TR self-focusing property. The TR of pulses is studied in two kinds of complex media: metallic waveguide and leaky reverberating cavity. For each medium, we propose one or two models to assess the quality of the focusing. For the waveguide, we show that the angle of incidence is an important parameter. Based on these results, we perform TR experiments at 273 GHz with a bandwidth that can be as large as 2 GHz. TR experiments are successfully first conducted in a 1 m long and 10 mm diameter straight hollow cylinder and then in a 5 m long and 12 mm diameter curved waveguide. Finally, we present results obtained in a cavity of 72 cm3 that leaks through a copper grid. The best focusing is observed with the longer waveguide.

Citation


Ali Mokh, Ramin Khayatzadeh, Abdelwaheb Ourir, Mohamed Kamoun, Arnaud Tourin, Mathias Fink, and Julien de Rosny, "Time-Reversal of Sub-THz Pulses in Complex Media," Progress In Electromagnetics Research B, Vol. 95, 141-162, 2022.
doi:10.2528/PIERB22020405
http://jpier.org/PIERB/pier.php?paper=22020405

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