Focusing an arbitrary RF pulse at a distance using time-reversal techniques
| Autor: | Zachary B. Drikas, Biniyam Tesfaye Taddese, Steven M. Anlage, Tim D. Andreadis, Sun K. Hong |
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| Rok vydání: | 2013 |
| Předmět: |
Beamforming
Physics Aperture business.industry General Physics and Astronomy Electronic Optical and Magnetic Materials Pulse (physics) Optics Transmission (telecommunications) Electrical and Electronic Engineering Focus (optics) business Energy (signal processing) Multipath propagation Impulse response |
| Zdroj: | Journal of Electromagnetic Waves and Applications. 27:1262-1275 |
| ISSN: | 1569-3937 0920-5071 |
| DOI: | 10.1080/09205071.2013.805310 |
| Popis: | In this paper, we demonstrate the use of a time reversal (TR) technique to effectively focus an arbitrary RF pulse at a remote location from a single-feed aperture for directed energy applications. The TR focusing is achieved by backing the aperture with a reverberating cavity, whose multipath environment enables the reconstruction of the aperture field distribution needed for directing the energy to the target location. Here, we use the impulse response between the target location and the time-reversal mirror (TRM) located inside the cavity to enable the effective transmission of arbitrary RF pulses, which are convolved with the time-reversed impulse response before transmission. The demonstration is carried out both numerically and experimentally for various RF pulses. The results show good temporal and spatial focusing at the target location. This approach could be an efficient selective “beamforming” method for directed energy, where it only requires a single feed and the impulse response between the ... |
| Databáze: | OpenAIRE |
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