Design of Dual-Bandpass Hybrid Waveguide-Microstrip Microwave Filters

A simple dual-bandpass filtering structure is pro- posed. The filter is implemented by means of a new hybrid waveguide­microstrip technology. The novelty of the structure is that it combines two standard printed microstrip coupled line resonators, with a resonance of the base waveguide cavity, to implement a dual-band operation. Important aspects about the filter design, useful for practical applications are treated. This includes a study on the maximum coupling that can be achieved to the cavity resonance, and guidelines to control the positions of the two passbands and the transmission zeros. Besides, an example has been designed, manufactured and tested. The measurements on the fabricated prototype have confirmed the validity of the new structure to perform dual-band operation.Ministerio de Educación y Ciencia, Ref. TEC2007-67630-C03-0

A Systematic Algorithm for the Design of Hybrid Waveguide-Microstrip Transversal Microwave Filters

A novel algorithm to design hybrid waveguide-microstrip transversal microwave filters is proposed in this study. The idea consists in isolating each resonator involved in the filter structure, to synthesise individually its frequency response, both in resonant frequency and bandwidth. These separated optimisations lead to the dimensions of the filtering structure to meet the requirements of a certain, specified transfer function. The novel algorithm introduces an iterative procedure in order to synthesise the direct coupling term between source and load, which is always present in the hybrid filter structure. The whole algorithm is illustrated by means of a design example, where a very good agreement between the ideal specified transfer function and the final frequency response of the designed hybrid filter is obtained. A second different design example, which has been manufactured and tested, is also included for validation.Ministerio de Educación y Ciencia, Ref. TEC2010-21520-C04-0

Novel implementations for microstrip resonator filters in transversal topology

This paper presents novel implementations of bandpass filters in multilayered microstrip technology. The structures presented implement transversal filter topologies of order three. In order to allow for easy implementation of the required couplings, multilayered broadside configurations are proposed. We demonstrate that with the proposed configurations, both dualband and quasi-elliptic responses can be easily synthesized, by only changing the sign of certain entries in the coupling matrix. To easily adjust the signs of the couplings, novel resonators are proposed, including simple half-wavelength transmission line resonators, meander line resonators and short-circuited resonators. Experimental validation for one prototype is presented, demonstrating the validity and usefulness of the proposed configurations.The authors thank Ministerio de Educación y Ciencia of Spain, which has supported this work under Grant TEC2007- 67630-C03/TCM

Projections of iot applications in Colombia using 5G wireless networks

Wireless technologies are increasingly relevant in different activities and lines of the economy, as well as in the daily life of people and companies. The advent of fifth generation networks (5G) implies a promising synergy with the Internet of Things (IoT), allowing for more automations in production processes and an increase in the efficiency of information transmission, managing to improve the efficiency in decision-making through tools such as big data and artificial intelligence. This article presents a description of the 5G implementation process in Colombia, as well as a revision of opportunities when combining with IoT in featured sectors of the departmental development plans, such as agriculture, tourism, health, the environment, and industry. Results shows that the startup of 5G in Colombia has been a slow process, but there are comparisons with similar procedures in other developed countries. Additionally, we present examples of 5G and IoT applications which can be promoted in Colombia, aimed at improving the quality of life of their habitants and promoting economic development

Design of bandpass transversal filters employing a novel hybrid structure

A novel structure for the implementation of compact transversal bandpass filters is proposed in this paper. This new proposal consists of a hybrid structure, based on the combination of two different technologies: the waveguide and microstrip. It is shown that the novel hybrid microwave filter is able to implement both a second- and third-order filtering function with up to two or three transmission zeros, respectively. In this way, a practical implementation of a fully canonical transversal filter with a third degree response is for the first time directly achieved. In addition, the way to control the positions of transmission zeros with the new technology is treated in this paper. It is shown that symmetric or asymmetric responses and also filtering functions with a complex pair of transmission zeros can be easily obtained. To demonstrate the validity of this novel structure, several implementation examples are presented. A prototype has been designed, manufactured, and successfully tested, showing the practical validity of the new structure

Effects of global postural reeducation on postural control, dynamic balance, and ankle range of motion in patients with hallux abducto valgus. A randomized controlled trial.

AbstractHallux abducto valgus (HAV) is a common musculoskeletal disorder that has been addressed surgically. Nevertheless, the manual therapy approach may play an important role in the management of this condition. The present study aimed to determine the effectiveness of global postural reeducation (GPR) in subjects with symptomatic mild to moderate HAV in static postural control, dynamic stability, and ankle dorsiflexion range of motion (DFROM). A total of 80 patients with mild to moderate symptomatic HAV were allocated to the intervention group (GPR) or control group (CG) (no treatment) for 8 weeks. Outcome measures were assessed at baseline at 4 and 8 weeks including static postural control (Romberg test), dynamic balance (Star Excursion Balance Test [SEBT]), and ankle DFROM (Weight‐Bearing Lunge Test [WBLT]). No improvements were observed at 4 weeks, but there were improvements at 8 weeks in: static postural control mediolateral displacement (X) of center of pressure (CoP) in both eyes open (EO) and eyes closed (EC): XEO (t(36) = 2.892, p = .006, d = 0.67); XEC (t(68) = 2.280, p = .026, d = 054); and velocity (V) of CoP displacement: VEO (t(68) = 2.380, p = .020, d = 0.57); VEC (t(36) = 2.057, p = .047, d = 0.37). It were also improvements in: WBLT (t(36) = −2.869, p = .007, d = 0.54) and SEBT at three directions (anterior, ANT; posteromedial, PM; and posterolateral, PL): SEBT.ANT (t(36) = −2.292, p = .028, d = 0.23); SEBT.PM (t(36) = −4.075, p < .001, d = 0.43); SEBT.PL (t(62) = −3.506, p = .001, d = 0.34). The present study showed that GPR compared to the CG might be effective in enhancing ankle function including postural control, dynamic balance, and DFROM

Respuesta en frecuencia para sistemas en espacio de estados

The frequency response of linear systems is a popular tool used in the analysis and design of automatic control systems. The common way to obtain the frequency response is from the input-output representation (transfer function) of a system. In this paper we present a novel way to obtain the frequency response from the state space representation. The result is obtained by characterizing the input signal (sine function) by means of an additional external system, as well as the evaluation of the steady state. The determination of phase and magnitude is obtained from the solution to a Sylvester equation repeatedly for different values of the frequency in a specific interval together with some algebraic manipulations and use of trigonometric identities. The procedure is shown by examples and compared with classical ways of obtaining the frequency response.La respuesta en frecuencia de sistemas lineales es una popular herramienta utilizada en el análisis y diseño de sistemas de control automático. La forma común de obtener la respuesta en frecuencia es a partir de la representación entrada-salida (función de transferencia) de un sistema. En este trabajo se presenta una manera novedosa para obtener la respuesta en frecuencia partiendo de la representación en el espacio de estados. El resultado es obtenido mediante la caracterización de la señal de entrada (función senoidal) mediante un sistema externo adicional, así como la evaluación del estado estacionario. La determinación de la fase y magnitud se obtiene de la solución a una ecuación de Sylvester reiteradamente para diferentes valores de la frecuencia en un intervalo específico junto con algunas manipulaciones algebraicas y uso de identidades trigonométricas. El procedimiento es mostrado mediante ejemplos y comparado con las maneras clásicas de obtener la respuesta en frecuencia

Flatness-based fault tolerant control

Este artículo presenta un método de control tolerante a fallas para sistemas no lineales planos. Las propiedades intrínsecas de los sistemas planos generan redundancia analítica y permiten calcular todos los estados y las entradas de control del sistema. Los residuos son calculados comparando las medidas reales provenientes de los sensores y las señales obtenidas gracias al conjunto de ecuaciones del sistema plano. Fallas multiplicativas y aditivas se pueden manejar de manera indistinta. Las señales redundantes obtenidas con las ecuaciones del sistema plano son usadas para reconfigurar el sistema con falla. La factibilidad del método propuesto es verificada para fallas aditivas en un sistema de tres tanques. ABSTRACT This paper presents a Fault Tolerant control approach for nonlinear flat systems. Flatness property affords analytical redundancy and permit to compute the states and control inputs of the system. Residual signals are computed by comparing real measures and the computed signals obtained using the differentially flat equations. Multiplicative and additive faults can be handled indistinctly. The redundant signals obtained with the differentially flat equations are used to reconfigure the faulty system. Feasibility of this approach is verified for additive faults in a three tank system

EGUAA 10 years after its creation: towards a guitar tradition?

La historia del Ensamble de Guitarras de la Universidad Autónoma de Aguascalientes (EGUAA) está configurada por una red de estados intencionales que han confluido en esta acción académica a través del tiempo: la creación de la Licenciatura en Música en el año 2009 y su rediseño en 2017, el modelo universitario en la formación de músicos, la creación de la Cátedra Alfonso Moreno en 2010 y los propósitos educativos en la Orquesta Filarmónica de la Universidad Autónoma de Aguascalientes, así como las intencionalidades pedagógicas que cada director activa cuando toma la batuta del ensamble. En este artículo se presentará la exploración que los estudiantes de guitarra –miembros del EGUAA– y su profesora de investigación, realizaron sobre la trayectoria del ensamble para verificar si existen indicios para reconocer una tradición guitarrística en esta comunidad universitaria.The history of the Guitar Ensemble of the Autonomous University of Aguascalientes (EGUAA) is shaped by a series of factors that have converge on this academic action over time: the creation of the Bachelor of Music in 2009 and its redesign in 2017, the university model that trains musicians, the creation of the Alfonso Moreno Chair in 2010, the educational purposes in the Philharmonic Orchestra of the Autonomous University of Aguascalientes, as well as the pedagogical intentions that each director activates when he takes the baton of the ensemble. This article will present the exploration that the guitar students –members of EGUAA– and their research professor, carried out on the ensemble’s trajectory to verify if there are clues to recognize a guitar tradition in this university community.Sociedad Argentina para las Ciencias Cognitivas de la Músic