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Metallic structures consisting of a central λ0/2 slot surrounded by straight parallel wedge corrugations present high transmission enhancement for an impinging EM beam, compared to that given by a single central slot with no grooves. Here, a 0.566 THz low profile leaky-wave antenna (LWA) with triangular corrugations is numerically and experimentally analyzed. Negligible differences are observed between...
Here, two different THz radiating structures are analyzed, consisting both of a central slot surrounded by annular or straight corrugations. Concentrically grooved antenna presents a moderately high gain. Its radiation and temporal properties are analyzed both numerically and experimentally. For the second case, no appreciable differences in terms of radiation characteristics are observed when the...
In this work, two different antenna prototypes working at THz frequencies and consisting of a central slot surrounded by corrugations are analyzed. In the first case, the corrugations are annular, leading to a moderately high gain. Its radiation and temporal properties are analyzed both numerically and experimentally. The other antenna has straight corrugations with triangular profile. Its radiation...
1D and 2D leaky-wave corrugated antennas working at terahertz frequencies are numerically and experimentally studied. These structures allow temporal-pulse and beam shaping by engineering the leakage rate of the surface waves induced by the corrugations.
In this article, we present our work on vertically aligned multi-walled carbon nanotube arrays for field emission cathodes and photocathodes. Carbon nanotubes cathodes deliver current densities up to 0.5A/cm2. To optically modulate the emission, silicon photodiodes have been integrated under the carbon nanotubes, allowing a laser-controlled emission. An ON/OFF ratio up to 23 has been achieved.
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