Campus Universitario Of Viesques

Gijón, Spain

Campus Universitario Of Viesques

Gijón, Spain

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Heredia-Juesas J.,Northeastern University | Gago-Ribas E.,Campus Universitario Of Viesques | Vidal-Garcia P.,Campus Universitario Of Viesques
Proceedings of the 2015 International Conference on Electromagnetics in Advanced Applications, ICEAA 2015 | Year: 2015

Signals and Systems Theory (SST) plays a fundamental role in the educational and professional background of electrical engineering as well as in many other scientific areas. Many authors present this theory following a scheme which is valid for the analysis of general problems but they avoid dealing with more general concepts, leaving out a wide range of problems. The final purpose is to develop a Generalized Signals and Systems Theory (GSST) which can include many different problems in a rigorous way. An important point related to this mathematical rigorousness is the relation between the ordinary functions and generalized functions in infinite dimensional signal spaces through the Rigged Hilbert Spaces (RHS), which is presented in this paper. © 2015 IEEE.


Gago-Ribas E.,Campus Universitario Of Viesques | Vidal-Garcia P.,Campus Universitario Of Viesques | Heredia-Juesas J.,Northeastern University
Proceedings of the 2015 International Conference on Electromagnetics in Advanced Applications, ICEAA 2015 | Year: 2015

This paper provides the current state of the analysis of the Transmission Line Theory based on complex analyses. These analyses include important parameterizations which are determined by specific normalizations, leading to graphical representations of the behavior of any circuit based on transmission lines with arbitrary losses. These graphical representations facilitate not only the physical understanding of the effects of losses but also reduce the study of any problem in terms of geometrical transformations. Finally, some illustrative examples will be summarized in order to get some insight of the Complex Transmission Line Theory. © 2015 IEEE.


Hadarig A.I.,Campus Universitario Of Viesques | Vazquez C.,Campus Universitario Of Viesques | Fernandez M.,Campus Universitario Of Viesques | Ver Hoeye S.,Campus Universitario Of Viesques | And 3 more authors.
Applied Physics A: Materials Science and Processing | Year: 2014

In this work, the nonlinear electromagnetic response of a few-layer graphene sheet is experimentally analyzed. The few-layer graphene sheet is obtained through mechanical exfoliation from highly ordered pyrolytic graphite and embedded in a rectangular waveguide structure which is used to guide the exciting and the output signals. The nonlinear electromagnetic response of the graphene sheet is exploited to implement a frequency multiplier in which the output signal, in the 330–500 GHz frequency band, will be obtained as a high-order harmonic component of the input signal, in the 26–40 GHz frequency band. Due to the particular selection of the input and output frequency ranges, the behavior of several harmonic components, from order 9 to 17, can be characterized. The analysis will be focused on the frequency response of the graphene sheet, the influence of the input power on the output signal and the differences between the even- and odd-order harmonic components. Finally, it will be shown that the developed assembly can be used as THz signal source based on high-order frequency multiplication. © 2014, Springer-Verlag Berlin Heidelberg.

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