Specific design of antennas and microwave communications devices. Space communication systems. Propagation and channel modeling.
This R&D line is focused on propagation and wireless channel modeling. Path loss modeling, time-and frequency-selectivity behavior of wireless channels and fading processes are covered. Propagation channel models are derived and validated from channel measurement campaigns in real environments. The GRE researches have experience in propagation and channel modeling for cellular networks, vehicular systems (V2I and V2X), MIMO, UWB and millimeter waves.
Analysis and design of passive microwave circuits implemented in planar technology (mircrostrip and coplanar), as well as in the promising hybrid technology of substrate integrated waveguide (SIW), both widely used in the areas of mobile (GSM and UMTS), wireless (LMDS, MVDS and FWA) and spatial (input stage) commincations. Under this R&D line the following activities are carried out: Development of new rigorous and efficient electromagnetic analysis methods (full-wave) for planar and SIW;Practical operation of full-wave electromagnetic comercial programs; Optimized design using aggressive space mapping techinques of new transmission lines and compact devices based in metamaterials; Design, including prototypes manufacturing and experimental measurements of passive devices in planar and hybrid tecnhologies for high frequency communications systems and Prediction of RF discharge effects (multipaction and corona) in planar devices to be used in space applications.
The objective of this R&D line is to motivate the design and development of future spatial stations of reduced weight (pico-satellites and micro-satellites of 10 kg and 50 kg, respectvely, payloads). This spatial mission will have either a scientific character (execution of on board experiments for medical, biological, pharmaceutical and nutritional applications) like a technological character ( validation of computational, electornic, both RF and optical, components and equipments on board in these future satellites). In this R&D line, a complete new development of the aforementioned spatial station of small size is proposed. This development would imply mission (orbits) design services, satellite-earth communicatin links and communication equipments (transceivers, cables, amplifiers, antennas and passive components)needed both in the satellite and in the earth tracking station.
The group has acquired experience and acknowledgement in a new R&D line that is a key point in the development of high frequency communications systems with reconfigurable characteristics (front-ends for RF radio systems defined by software, tunable wireless communications and reconfirgurable satellite payloads). Thus, future passive components (especially filters and multiplexers) with fully reconfigurable electric characteristics (type of response, cnetral frequencies and operational bandwiths), must be developed. In this R&D line, progress is made in the design of circuits in planar and SIW technology (essentially filters) with passaband response of reconfigurable micro-electro-mechanical systems (MEMS) used as switches (discrete tuning elements). The use of new advanced materials (ferroelectrics, quartz crystals and ferrites)with controllable electric and magnetic properties is also investigated. Among the main results of this R&D line, it should be pointed out that a national and internatioal patent has been requested of a "Microwave tunable filter in surface mounted technology based on substrate integrated coaxial resonant cavities", with Ref. PCT/ES2012/070649. The development of this promising R&D line makes use of the group facilities mentioned before, such as full-wave EM simulation laboratory, manufacture and integration of components in planar and hybrid technology, as well as the experimental characterization systems for these high frequency devices.
This R&D line is focused in the development of future applications in the sustainability field making use of the existing spatial communications systems (i.e. European satellite navigation systems - GALILEO- and monitoring and global security -GMES-), such as: efficient traffic management as well as human and goods transport using the GALILEO satellite network, sustainable management of natural resources (water, agricultrual and territorial organization, both rural and urban) and management of disasters due to natural or human causes (floods, earthquakes, fires, droughts, toxic spills) using satellite images provided by Earth observation. The group has the knowledge, experience and tools to erform processing of the datsa form on board SAR instruments, either on board the satellite itself with a half-level resolution and in post-processing chain of SAR data once received in the ground stations. Also, the group has teh capacity to propose mechanisms to perform the data compression on board the satellite in order to facilitate the transmission of SAR data to ground receiving centers. Consulting and advising services in the field os satellite communications systems are also offered to be used in various practical applications. Specifically, the grouphas the experience in carrying out feasibility studies, development, implementation, evaluation and final show of this type of satellite communications systems, having participated as consultant in requeriments definition for some of these systems ( eg European systems called Galileo satellite navigation for ground, see and air applications).
The group has proven experience in the technological development of passive circuit (filters, diplexers and multiplexers, distribution networks)used in high frecuency communication systems ( with special emphasis on space applications) and development in guided technologies (waveguides, coaxial, metallic cavities with arbitrary 3D geometry and dielectric resonators). This R&D line involves all the necessary stages for the technological development of the above components, i.e.analysis, synthesis and optimized design, prototyping adn experimental validation.
Conventional waveguides present a high attenuation in the THz band due to the high ohmic losses on metallic surfaces and the high absoprtion in dielectric materials. GRE analyzes and proposes waveguides that palliate these problems. Moreover, GRE studies and proposes efficient feeding structures for the newly proposed waveguides, as well as modifications of these waveguides to reduce the losses on curved paths.
GRE researches on the field of measurement and diagnosis of antennas. Has developed a suite of commercial software (PAM) ranging from data acquisition, with subsequent processing and far field transformation of the near-field measurements acquired; to antenna diagnosis by means reconstruction of surface currents.
GRE researches on new wave guiding structures based on the use of novel artificial surfaces wich are suitable for millimeter and submillimeter-wave bands since they relax fabrication constraints and facilitate device integration.
Solid experience in slotted waveguide array design for radar and sitcom applications. Our group has developed an efficient software tool for analysis and design and works with well-known companies in the field (Astrium-CASA, Indra, Thales-Alenia France, TTI Norte).
The Theory of Characteristic Modes provides very interesting information about the radiating behavior of arbitrary-shaped radiating structures. This information allows designing and optimizing different types of radiating elements. The Group has a very wide experience in the use of characteristic modes for wideband and multiband antenna design in mobile and wireless applications, MIMO antenna, antennas for UWB systems, TDT antennas and antennas for vehicular applications.
Instituto de Telecomunicaciones
y Aplicaciones Multimedia (iTEAM)
Edificio 8G. Planta 4ª, acceso D
Universitat Poltècnica de València
Camino de Vera, s/n
Phone +34 963879580
Fax +34 963879583