Multifrequency and multifunction antennas based on single printed technology partially filled with metamaterial structures

The Radiofrequency Group from the Escuela Politécnica Superior of the Carlos III University from Madrid have been working in printed antennas for a long time. Recently the new technology of metamaterials has opened new possibilities in the development of multifrequency antennas with different radiation patterns to be used simultaneously for several applications (i.e. different mobile services and GPS or Galileo

Ingeniería UC3M: de la formación a la profesionalización

El pasado 12 de mayo, el Parque Científico de la UC3M recibió a Álvaro Giménez, director de Ciencia y Exploración Robótica de la Agencia Espacial Europea (ESA) y director de esta agencia en España. Este encuentro refleja, una vez más, la relación de la UC3M con organismos y empresas, nacionales e internacionales, líderes en el terreno de la ingeniería. La Escuela Politécnica Superior de la UC3M nació con la aspiración de convertirse en uno de los mejores centros universitarios europeos en ingeniería y con el objetivo de contribuir a la mejora de la sociedad

Antenas multifrecuencia y multifunción basadas en tecnología impresa simple parcialmente rellenas con estructuras metamateriales

El grupo de Radiofrecuencia de la Escuela Politécnica Superior de la Universidad Carlos III de Madrid lleva desarrollando desde hace muchos años antenas basadas en tecnología impresa. Los llamados metamateriales han abierto nuevas posibilidades en el desarrollo de los parches convencionales: antenas de múltiple frecuencia, diversos diagramas de radiación diferentes para abordar simultáneamente aplicaciones diferentes (i.e. antenas para dos servicios móviles diferentes y GPS o GALILEO)

Fully Planar Dual-Polarized Broadband Antenna for 3G, 4G and Sub 6-GHz 5G Base Stations

A fully planar dual polarized radiating element with internal embedded coupled dipoles is presented in this paper. The inclusion of these elements allows achieving three different goals: firstly, an extension of the bandwidth towards lower frequencies (from 1.69 GHz to 1.427 GHz) as required in new 5G standards; secondly, a reduction of the antenna size in comparison with other topologies for bandwidth extension and, finally, a reduction of the secondary lobes. The proposed dual polarized broadband antenna is based on two sets of dual polarized dipoles, with a fully planar structure. The objective of this paper is the design of an antenna working in the extended 5G band in order to fulfil the future 5G requirement in the microwave region, in which the new frequency bandwidth goes from 1.427 up to 2.69 GHz with the return losses lower than -14 dB and the crosspolar isolation larger than 28 dB.This work was supported in part by the Spanish Ministry of Education, Culture and Sport under a grant for predoctoral contracts for University Teacher Training under Grant FPU16/00459, and in part by the Spanish Ministry of Science, Innovation and Universities, (program ``Programa Estatal de I+D+i orientada a los Retos de la Sociedad'') under Grant RTC-2017-6394-7

Non-Foster matching network for a small, bladetype monopole in the VHF Band

In many applications, like in aeronautical control and communication systems, there are important requirements for the antenna engineer in terms of size and weight of the antennas. Active matching networks, with non-Foster elements, are an interesting way to face the design of an Electrically Small Antenna (ESA). Using the new sensitivity parameter Sens, a good location for a matching network (MN) is found in the structure itself of a blade-type small monopole. Then, comparative design between a passive reactive and an active non-Foster matching network is presented

Design considerations in an active matched semiloop array with Non-Foster networks

Most of the work in phased arrays loaded with non-Foster forms has been made about characteristics that look for avoiding beam squint in radiation along frequency or enhancing the array beam-width or gain at a broad frequency range. This work aims at pointing some considerations about a two elements array loaded with non-foster forms in terms of impedance matching and radiation pattern

Dual-Band Tunable Recursive Active Filter

This letter presents a novel recursive active filter topology that provides dual-band performance, with independent tuning capability in both bands. The dual-band operation is achieved by using two independent feedback lines. Additionally, linear phase shifters based on left-handed cells are included in these two branches in order to tune the center frequency of both pass bands

Multiple Order Dual-Band Active Ring Filters with Composite Right/Left Handed Cells

In this paper, a novel dual-band active filter topology is presented. The non-linear phase response of a composite right/left-handed cell is used to achieve the desired dual-band performance. Additionally, the proposed structure based on coupled ring resonators yields a very compact solution in which high-order implementations can be easily obtained by cascading multiple rings. The theoretical principles of this type of filters are analyzed in detail. Finally, three prototypes based on first-, second- and third-order structures validate the feasibility of this type of filters. Good agreement between simulations and measurements has been achieved

Consideraciones de diseño de adaptación activa para antenas cargadas con circuitos non-Foster

In this paper the use of the NDF is proposed as a general method suitable for analysing any oscillator topology. The most important advantage of this method is that it provides an unique procedure to analyse any oscillator. It also makes possible the phase noise optimization in the linear design phase for any oscillator. An additional advantage of this method is that it does not require any proviso verification as all classic methods need. The use of the NDF method is illustrated with the design of two examples. These two oscillators are manufactured and the simulation results are compared with the measurements showing good agreement. These results confirm the excellent possibilities of the proposed method for low noise oscillators design