Open Access
New analytical method to design filters by combining the periodic and resonant filtering effects of EBG cells
(IEEE, 2005) Ibáñez Loinaz, Asier; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
In this paper a new analytical method to design stop-band filters combining the Bragg and resonant effects is presented. A rigorous consideration of the EBG structures filtering effect at the microwave frequency range will be performed. We will show that in that frequency range, the periodic structure filtering effect (or Bragg effect) and the self-resonance of the different cells involved are tuned approximately at the same frequencies, mixing their influences in the final filter response. Both effects are defined by different geometrical laws, and filters with very interesting properties such as high rejections, sharpness and reduced insertion losses, can be obtained when tuning the EBG effect and the resonant effect at the same frequency.
Open Access
Transición coaxial a guía doble ridge cargada
(2005) Cantora Álvarez, Pablo; Río Bocio, Carlos del; Teniente Vallinas, Jorge; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
In this paper a new method to design a transition from coaxial waveguide to a loaded double ridge waveguide is proposed. This method allows the use of the large frequency bandwidth ridge waveguides present. In the example shown, a reflection coefficient smaller than -10dB is obtained in a fractional bandwidth of 250% (f1-8*f1). The similarities between the dominant TEM modes of microstrip waveguide and loaded double ridge waveguides are the basis of this design method. The complete transition is made up through an intermediate transition to microstrip waveguide. Excellent behaviour is obtained.
Open Access
Redes de alimentación de agrupaciones basadas en CORPS
(2006) Betancourt Quiñones, Diego; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
A new beam-forming Network concept is introduced. This Network is based in the design principles of CORPS. The new proposed structure presents an improvement in design over the traditional beam-forming Network -BFN since, with this kind of feed networks, is feasible to reduce the number of the Phase Shifters of N:1. Two implementations, based on Gysel Power Dividers, are also showed to corroborate the theoretical concepts.
Open Access
Coherently radiating periodic structures (CORPS) and the human eye: working principle
(2005) Betancourt Quiñones, Diego; Ibáñez Loinaz, Asier; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
In this paper a new philosophy to design antenna systems is presented. It is based on the recently proposed Coherently Radiating Periodic Structures (CORPS). These structures are essentially a periodic structure which all the elements are radiating elements coupled coherently (in-phase). The working principle of these structures is quite similar that the working principle of the photoreceptors of the human eye detecting images, opening the possibilities to define high resolution artificial visual systems.
Open Access
Application of coherently radiating periodic structures for feeding subarrays in limited-scan arrays
(IEEE, 2023) Juárez, Elizvan; Panduro, Marco A.; Covarrubias, David H.; Reyna, Alberto; Río Bocio, Carlos del; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza
This paper presents a new design technique to improve the reduction of phase shifters using sub-arrays and CORPS (coherently radiating periodic structures) technology. The CORPS network generates the values of cophasal excitation with reduced input ports. These values feed an optimal sub-arrays structure. Furthermore, fixed and variable amplifiers allow a low SLL (side lobe level) by using a raised cosine amplitude distribution along sub-arrays inputs. The theoretical model of CORPS-Subarrays, numerical and experimental results of several design cases are presented. The proposed design achieves a ±14° scanning range with a higher reduction of phase shifters than other techniques presented previously in the state of art. This paper illustrates, as a contribution, the complete antenna system based on the fabrication of a prototype and experimental results to analyze the reduction capacity of phase shifters and scanning possibilities of the proposed methodology in antenna arrays. The experimental results of the BFN (beam-forming networks) prototype at 6 GHz for 11 antenna elements and 3 phase shifters are provided. The proposed design achieves a reduction of 72% of phased shifters with ±14° beam scanning and −15 dB of SLL.
Open Access
Choked-gaussian corrugated horn antenna design small global coverage horn antenna for TT&C with extremely low sidelobe level
(2003) Teniente Vallinas, Jorge; Gonzalo García, Ramón; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
Extremely low sidelobe horn antennas are often required for the actual technology. This type of horn antennas are important to avoid interference with other systems. In this paper we describe a new design implementing a radical change in the current technology. It consists in attaching together a choked-waveguide antenna with a classical pure gaussian output corrugated horn. A really impressive radiation pattern with very low sidelobes and crosspolar levels in a very short antenna is obtained. This antenna shape was firstly presented in [1]. In this paper an improvement in size, weight, bandwidth and crosspolar level of the design is shown. This improvement has been possible due to the optimisation of the profile by means of the use of a mode matching code (mwave Wizard) instead of a time consuming finite element code.
Open Access
Antena corrugada con perfil gaussiano de gran ancho de banda
(2001) Teniente Vallinas, Jorge; Gonzalo García, Ramón; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
En este trabajo se presenta el diseño de una antena de bocina corrugada con más de un 40% de ancho de banda. Los patrones de radiación medidos coinciden muy bien con los simulados. Esta antena se puede usar en aplicaciones que requieran un gran ancho de banda con bajos lóbulos laterales (< -28 dB), baja polarización cruzada (< -30 dB) y con requerimientos en potencia reflejada no demasiado restrictivos (< -15 dB).
Open Access
Resolution capabilities of future THz cameras
(Radioengineering Society, 2011) Lizarraga Cubillos, Juan Camilo; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
THz technology for developing imaging systems has recently aroused great interest, mainly due to the large number of applications in which these frequencies can be used: security, vision in hard environments, etc. In this paper we propose a method that reduces significantly the number of detectors needed for achieving certain resolution by means of diffraction that paradoxically is its main limiting factor in current imaging devices. The method uses diffraction as a way of achieving the advantages of the spatial diversity (information spread over a set of detectors) giving also the possibility to increase the resolution of the obtained images interpolating samples between detectors thanks to the slow variation function created by the diffraction phenomena.
Open Access
Diseño de filtros en guía rectangular usando estructuras PBG's
(2000) Mendióroz, Luis; Martínez de Espronceda Cámara, Beatriz; Gonzalo García, Ramón; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
A new application of dielectric periodic structures (also known as PBG) to build and design waveguide filters is presented. The periodic structures have some stop frequency bands, band gaps, defined by the geometry, within any mode can propagate through the structure. One could use this particular feature of the periodic structures to implement waveguide filters, or any other device with some frequency dependence [1,2]. In particular, we will focus in the description through an example of all the different effects produced by this kind of structures within a rectangular waveguide.
Open Access
Diseño y medida de una antena choke-gaussiana
(2002) Goñi Campión, David; Teniente Vallinas, Jorge; Gonzalo García, Ramón; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
A new design of corrugated horn antenna for global earth coverage from a geostationary satellite to obtain very low sidelobes and crosspolar levels with a really compact design in a quite wide bandwidth is presented in this paper. We compare this horn performance with the designs of other authors. Measurements show a really impressive radiation patterns with sidelobe levels below –43 dB in a certain bandwidth.