Open Access
Ultra-wide band corrugated profiled horn antenna design
(IEEE, 2002) Teniente Vallinas, Jorge; Gonzalo García, Ramón; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
Nowadays, an increasing number of applications need stable radiation patterns with low sidelobes and low crosspolar levels in a very wide bandwidth. Gaussian Profiled Horn Antennas (GPHA’s) have demonstrated its feasibility as one of the best solutions. A corrugated gaussian horn antenna design with more than 40% bandwidth is proposed in this letter. The measured radiated far field patterns have a good agreement with the simulated ones. The measured results show a gaussian antenna with extremely wide bandwidth low sidelobes and low crosspolar levels.
Open Access
Designing antenna systems with CORPS (coherently radiating periodic structures)
(2005) Betancourt Quiñones, Diego; García Esparza, Raúl; 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). This principle could allow the designer to simplify the needed feeding network for many array antenna systems since some elements could be coupled from the neighbouring ones, keeping the original excitation profile. It will be also shown in this paper how the three dimensional version of CORPS could be understood as a focusing planar lens, since it is possible to distribute the information of one element to many radiating elements by using the coherent coupling mechanism between all the elements of the whole structure. With this configuration, many directive beams could be really close to each other, increasing the possibilities to handle high resolution in imaging systems.
Open Access
Hybrid analog-digital SAR instrument with reflector antenna and overlapped subarray feed for earth observation
(IEEE, 2021) García, Quiterio; Orgaz, Lara; Castillo, Javier del; Toso, Giovanni; Imbembo, Ernesto; Biurrun Quel, Carlos; Río Bocio, Carlos del; Memeletzoglou, Nafsika; Institute of Smart Cities - ISC
As part of the European Space Agency (ESA) studies of new instrument for Earth observation, the design of a synthetic aperture radar (SAR) architecture based on overlapped array antennas was launched last year. The objective of the activity is to develop a test unit of a reflector based SAR antenna fed by an array organized in overlapped subarrays, supporting novel multichannel wide-swath SAR architectures, and exploiting multiple beams in both azimuth and range/elevation directions. In the letter, a hybrid analog/digital beamforming on reception with analog beamforming approach on transmission is analyzed. The antenna system consists of a large oversize reflector with a feedarray capable of generating multiple beams on receive for digital processing. In the letter, a description of the hybrid SAR Instrument is presented, describing the characteristics of the system, the antenna, the considered feedarray options and the main characteristics and system performances.
Open Access
Feeder system design for OLAF SAR instrument
(IEEE, 2022-04-11) Biurrun Quel, Carlos; García-García, Quiterio; Río Bocio, Carlos del; Institute of Smart Cities - ISC
The design of the feeding system for the focal array in OLAF (Over-Lapped Sub-Array Fed) antenna for SAR Instrument at L-Band is presented. The proposed design consists of a circular patch with a balanced excitation all of it embedded in a ground plane which is connected to the lower ground plane by some shorting pins, reducing the mutual coupling with the neighbour radiating elements of the focal array. The balanced excitation has been implemented with a 180° hybrid using the differential input port. Dual polarization is achieved by using two 180° hybrids within the same layer. The stringent requirements for the system, namely low in cross-polarization, high isolation between the two polarizations (both below the-25dB reference level) and azimuthal symmetry of the radiation pattern are fulfilled within all the working bandwidth.
Open Access
Meta-material behaviour of the new Coherently Radiating Periodic Structures (CORPS)
(2005) Betancourt Quiñones, Diego; Ibáñez Loinaz, Asier; García Esparza, Raúl; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
In this paper, the study of the new Coherently Radiating Periodic Structures (CORPS) like a Metamaterial sets out. The shape of the structure under study is composed by two different layers, one layer is an array of square metallic patches and the other layer is an array of cross shaped slots. All the elements of each layer are placed in a rectangular lattice grid of lg, ensuring coherent coupling between elements of the same layer being this the main feature of the Coherently Radiating Periodic Structures (CORPS). To built up the whole structure, a total number of three layers (patches-slots-patches) are stacked and separated by dielectric slabs of either 10.2 or 1.0006 (air) of permittivity. The simulations were done using MoM and Finite Elements Method (i.e. Ansoft Designer and HFSS respectively).
Open Access
Reduction of phase shifters in planar phased arrays using novel random subarray techniques
(MDPI, 2024-07-06) Valle, Juan L.; Panduro, Marco A.; Río Bocio, Carlos del; Brizuela, Carlos A.; Covarrubias, David H.; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza
Reducing the number of phase shifters by grouping antenna elements into subarrays has been extensively studied for decades. The number of phase shifters directly affects the cost, complexity, and power consumption of the system. A novel method for the design of phased planar antenna arrays is presented in this work in order to perform a reduction of up to 70%70% in the number of phase shifters used by the array, while maintaining the desired radiation characteristics. This method consists of creating fusions of subarrays to generate random sequences that form the best feeding network configuration for planar phased arrays. The obtained solution allows scanning the mainlobe at 𝜃=−40∘θ=−40∘ elevation with a range of scanning of [−75∘<𝜙<75∘][−75∘<ϕ<75∘] in the azimuth plane, while maintaining a side lobe level below −10−10 dB and achieving a reduction of 62%62% in the number of phase shifters. It is shown that each solution is created based on search criteria, which influence the morphology of the array in terms of subarray size and orientation. The proposed methodology shows great flexibility for creating new phased antenna array designs that meet the requirements of specific applications in a short period of time.
Open Access
Synthesis of volumetric ring antenna array for terrestrial coverage pattern
(Hindawi, 2014) Reyna, Alberto; Panduro, Marco A.; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
This paper presents a synthesis of a volumetric ring antenna array for a terrestrial coverage pattern. This synthesis regards the spacing among the rings on the planes X -Y, the positions of the rings on the plane X -Z, and uniform and concentric excitations. The optimization is carried out by implementing the particle swarm optimization. The synthesis is compared with previous designs by resulting with proper performance of this geometry to provide an accurate coverage to be applied in satellite applications with a maximum reduction of the antenna hardware as well as the side lobe level reduction.
Open Access
Coherently radiating periodic structures (CORPS): aplicaciones prácticas
(2005) Ibáñez Loinaz, Asier; Betancourt Quiñones, Diego; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
In this paper some possible applications of the new philosophy to design antenna systems based on the Coherently Radiating Periodic Structures (CORPS) is presented. This principle could allow the designer to simplify the needed feeding network for many array antenna systems since some elements could be coupled from the neighbouring ones, keeping the original excitation profile. It will be also shown in this paper how the three dimensional version of CORPS could be understood as a focusing planar lens, since it is possible to distribute the information of one element to many radiating elements by using the coherent coupling mechanism between all the elements of the whole structure. With this configuration, many directive beams could be really close to each other, increasing the possibilities to handle high resolution in imaging systems.
Open Access
Design and characterization of terahertz CORPS beam forming networks
(Springer, 2023) Biurrun Quel, Carlos; Haddad, Thomas; Sievert, Benedikt; Kress, Robin; Weimann, Nils; Erni, Daniel; Rennings, Andreas; Stöhr, Andreas; Teniente Vallinas, Jorge; Río Bocio, Carlos del; Ingeniería Eléctrica, Electrónica y de Comunicación; Institute of Smart Cities - ISC; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
This work reviews the design and applicability of beam-forming networks based on Coherently Radiating Periodic Structures (CORPS-BFN) at Terahertz (THz) frequency bands. These versatile networks offer two operation modes: a continuous beam steering – feeding an antenna array with a linearly progressive phase distribution – using a reduced number of phase controls; or a multi-beam operation, generating independent, overlapped beams. These networks are built upon the concatenation of power combiners/dividers (PCDs) with isolated outputs. The isolation is provided by monolithically integrated resistors, implemented with Ti/TiO thin films for the first time. In this work, a planar prototype of a (inputs/outputs) microstrip CORPS-BFN for operation in the WR3.4/WM-864 band (220–330 GHz) on a thin 50 m Indium Phosphide (InP) substrate is designed, fabricated, and characterized. The measured S-parameters show a reflection coefficient better than -15 dB and an insertion loss between 1.6 and 3.2 dB in the whole band. In addition, an isolation better than 20 dB between the input ports has been measured. An overall remarkable agreement is observed between the measurements and the simulations. Last, the applications, scalability and efficiency of this type of networks at the targeted band are discussed in detail.
Open Access
Utilizando CORPS-BFN para alimentar sistemas de antenas de múltiples haces
(2007) Betancourt Quiñones, Diego; Río Bocio, Carlos del; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
This paper present an application of the Coherently Radiating Periodic Structures - CORPS on the design of a Beam Forming Network -BFN. The Named CORPS-BFN is a novel feeding network with special behaviour characteristics that allows several improvements compared with classical feeding networks, such as, the reduction of necessary electronic to control a phased array and the possibility to have several beams very close to each other. In this paper, an analytical comparison of CORPS-BFN with both a Horn Antenna Array and a uniformly field distribution antenna will be analyzed. This study shows how applying this technology to a Multibeam antenna system the area necessary to radiate 7 independent beams can be drastically reduced.