Examinando por Autor "Gutierrez, Guadalupe G."

Mostrando 1 - 4 de 4

Restringido
A shielding effectiveness prediction method for coupled reverberant cavities validated on a real object
(Taylor and Francis online, 2015-07-25) Fernández Romero, Sergio; Gutierrez, Guadalupe G.; González, Iván; Ministerio de Economía y Competitividad (MINECO)
In the last years, different works on reverberant microwave propagation and high frequency coupling inside oversized structures have been published in order to make progress in the investigation of wireless systems and electromagnetic threats. In this paper, a new focus to the shielding effectiveness (SE) prediction using the reverberation microwave propagation formalism has been applied to a real complex object attaining very good agreement with the measured data obtained from nested reverberation chamber method. The used formalism is the combination of the simplified propagation model with the updated and more accurate formulation for cavity Q-factor and energy dissipation mechanisms. A very wide frequency range, from 500 MHz to 40 GHz, has been analyzed, which allows us to draw conclusions about how each parameter affects the final SE result at different frequency bands. Furthermore, a tuning study has been performed taking into account the tolerance in the most important parameters, such as the cavity size, the Q-factor, the main dissipation energy mechanisms, and the aperture shapes.
Acceso Abierto
On the Use of FDTD for HIRF Validation and Certification
(The Electromagnetic Academy (USA), 2012-06-12) Gutierrez, Guadalupe G.; Fernández Romero, Sergio; Álvarez, Jesús ; González García, Salvador; Pascual Gil, Enrique; Ministerio de Ciencia e Innovación (MICINN); European Commission (EC); Junta de Andalucía
Preparing the 3D-geometry models to perform electromagnetic compatibility (EMC) numerical simulations can be tedious and time consuming. Furthermore, the need to include the test setup in the models, in order to validate the software, by comparing the numerical results with the measured data, may lead to unwieldy simulation models with often una ordable computational costs. In this paper, we provide strategies for optimizing and simplifying the modeling process, together with guidelines for achieving the most unfavorable case in the simulation of EMC problems, as required for a certi cation process. A test case from the European FP7 HIRF-SE project is analyzed in this paper as an example of how to identify the unnecessary elements for the simulation, while retaining the essential physics of the problem.
Restringido
Prediction of the maximum electric field level inside a metallic cavity using a quality factor estimation
(Taylor and Francis online, 2014-06-26) Fernández Romero, Sergio; Gutierrez, Guadalupe G.; González, Iván; Ministerio de Economía y Competitividad (MINECO)
This paper presents a method for predicting the maximum electric field level inside a metallic cavity making use of the quality factor (Q) estimation. This calculation requires a two-step approach combining several theoretical models which can be found in the literature. A very good agreement in the frequency range between 100 MHz and 40 GHz has been achieved with the data obtained from the validation of two reverberation chambers made of different conductive materials. The wide frequency band analyzed permits us to draw conclusions about the main contributions in the cavity Q and their relationships with the maximum electric field level. This paper also describes and identifies the relationships between the antenna parameters and dissipation mechanisms vs. frequency for the different models. This estimation could be used to calculate a possible EMC threat of a spurious emission of EM signals which could produce a susceptibility problem in other equipments installed in the same cavity.
Restringido
Validation procedure of low level coupling tests on real aircraft structure
(IEEE Xplore, 2012-12-31) Fernández Romero, Sergio; López Morales, Andrés; Añón Cancela, M.; Gutierrez, Guadalupe G.; European Commission (EC)
This paper describes the analysis of the experimental test results obtained during the low level swept coupling (LLSC) and low level direct drive (LLDD) tests on FALCON 7X horizontal tail plane provided by EADS-CASA. These techniques are evaluated during the aircraft high intensity radiated field (HIRF) certification process and in the scope of European Community's FP7 HIRF SE project. The analysis of low level test results shall be performed to estimate the influence of the test setup with particular regard to the in-flight coupling configuration. For this reason, finite difference time domain (FDTD) 3D computations have been used to determine the relationship between free field external radiation and skin current in different illumination angles and polarizations. Finally, after validation by comparison of the measured and computed skin current, measured bundle current are related to measured skin currents, to provide the transfer function link to the external field.