A Reconfigurable Frequency Measurement (RFM) device operating from 1 to 4 GHz has been designed, simulated, fabricated and tested. The RFM device can identify an unknown signal by assigning it to one of the four sub-bands defined by a switched circuit. The 2-bit design is formed by switching between two branches, where each branch corresponds to one bit. The RFM device is made using PIN diodes and other surface mounted components, integrated on the same dielectric substrate in microstrip technology. Simulated and measured results are shown with a very good agreement.
This paper presents a building block approach to design a reconfigurable discriminator (RD), which is the core circuit in frequency identification receivers. The RD is used to identify an unknown signal; the output of the circuit determines a frequency subband where the unknown signal falls into. The proposed building block design approach is scalable and can be used to produce any multibit RD. This design approach can be used to produce RD circuits with more or less resolution for a fixed band of operation, according to the number of bits used for a given design. The building block approach is demonstrated through the design of a 4‐bit RD. This design is a two‐port device that provides a series readout and can produce 4 bits for frequency identification. The device operates from 1 to 4 GHz, implemented by microstrip lines and PIN diode switches. Simulated and measured responses are in agreement.
This paper presents a novel 4-bit reconfigurable discriminator for frequency measurement, operating from 1 to 4 GHz. The discriminator is a two-port device used to identify the frequency of an unknown signal by switching between its 4 states. The device is formed by a fixed reference line and a switchable delay line. The device is implemented using microstrip lines and PIN diodes. Simulated and measured results are presented for the four states of the reconfigurable discriminator.
This paper presents a building block approach for the design of frequency identification receivers. The devices are based on a Reconfigurable Discriminator (RD) for frequency measurement, operating from 1 to 4 GHz. The RD is a two-port device used to identify the frequency of an unknown signal. The devices use RF switches, which are implemented with PIN diodes to select different bits used for frequency identification.
Hoy en día, es de vital importancia conocer la ubicación geográfica de una persona vulnerable (víctima) cuando se presenta una emergencia. Esta información resulta de interés para las autoridades competentes y familiares de la víctima. Gracias a los Sistemas de Posicionamiento Global (GPS) y Global para las comunicaciones móviles (GSM) esta tarea es cada vez más sencilla, y efectiva. En este trabajo se presenta un prototipo de una pulsera de geolocalización denominado botón de pánico e implementado con tecnologia de bajo coste. El protótipo tiene como objetivo principal demostrar la viabilidad y funcionalidad del sistema de geoposición propuesto para una futura implementación utilizando tecnología de sistemas microeletromecánicos (microelectromechanical systems, MEMS). La activación y funcionamiento del prototipo se basa en el principio de percepción de tiempo, y en el envío de mensajes de auxílio a por lo menos tres personas de confianza usando la red GSM, respectivamente. Cada mensaje tiene un enlace que se puede abrir con la aplicación Google Maps y visualizar la posición geográfica de la víctima en tiempo real. Los mensajes se envían cada 3 minutos de forma automática. El prototipo es implementado como un Arduino UNO, un módulo GPS, modelo Neo-6M-uBlox, y un módulo GSM, modelo IoT-GA6-B.
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