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dc.contributor.advisorColom-Ustáriz, José G.
dc.contributor.authorGiraldo-Castañeda, Luis G.
dc.date.accessioned2019-05-15T17:59:35Z
dc.date.available2019-05-15T17:59:35Z
dc.date.issued2006
dc.identifier.urihttps://hdl.handle.net/20.500.11801/2384
dc.description.abstractThis work presents the design and implementation of a complete X-band phase shifter system using vector (polar) modulation, suitable for solid-state phased array radar applications, providing a cost effective solution which overcomes the main constraints involved with traditional systems. The performance characteristics for three intermediate frequencies (150MHz, 440MHz, 850MHz) are shown. The three cases present similar response. It was found that the errors were minimal for gain setpoints above -20dB providing a reliable dynamic range of about 20dB. The gain error is less than ±1.5dB and the phase error is ±17 degrees maximum. It can be observed that the lower the gain setpoint the higher the overall error, also the phase error is higher at phase setpoints near 0 and 180 degrees, likewise the gain error is higher at phase setpoints near ±90 degrees. The effect of the phase shifter’s error in the main beam direction, beamwidth and side lobe level for a linear array is analyzed along a scanning angle of 90 degrees around broadside, using a 20 elements Chebyshev distribution. It is shown that designing for a desired SLL=-30dB, the main beam pointing direction error is almost negligible with a maximum beam deviation of 0.25 degrees. The side lobe level error is less than 5dB and the 3dB beamwidth error is lower than ±0.2 degrees. A four channel prototype was built to evaluate the network connectivity of the phase shifter and finally an X-band image reject mixer is added to verify its operation at X-band frequencies.en_US
dc.description.abstractEste trabajo presenta el diseño e implementación de un sistema completo de desplazamiento de fase en banda X empleando modulación vectorial (polar), adecuado para aplicaciones en radares de estado sólido que utilizan arreglos de fase. El sistema proporciona una solución costo efectiva la cual supera las principales restricciones involucradas en sistemas tradicionales. Se muestran las características de desempeño a tres frecuencias intermedias (150MHz, 440MHz, 850MHz), las cuales presentan respuesta similar. Se encontró que los errores fueron mínimos para ganancias por encima de -20dB proporcionando un rango dinámico confiable de alrededor de 20dB. El error en ganancia es menos de ±1.5dB y el error en fase es de ±17 grados máximo. Puede observarse que cuanto mas baja es la ganancia mas alto es el error global, también, el error en fase es mas alto para fases cercanas a 0 y 180 grados, del mismo modo, el error en ganancia es mas alto para fases cercanas a ±90 grados. El efecto del error del desplazador de fase en la dirección del haz principal, el ancho del haz y el nivel de lóbulos laterales es analizado para un arreglo lineal, en un rango de escaneo de 90 grados alrededor de broadside. Se usó una distribución Chebyshev para 20 elementos y se muestra que diseñando para un SLL=-30dB, el error en la dirección del haz principal es casi despreciable con una desviación máxima de 0.25 grados. El error en el nivel de lóbulos laterales es menos de 5dB y el error en el ancho del haz es mas bajo que ±0.2 grados.en_US
dc.description.sponsorshipSupported primarily by the Engineering Research Centers Program of the National Science Foundation under NSF award number 0313747.en_US
dc.language.isoEnglishen_US
dc.titlePhase shifter system using vector modulation for phased array radar applicationsen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2006 Luis Guillermo Giraldo-Castañedaen_US
dc.contributor.committeeCruz-Pol, Sandra L.
dc.contributor.committeeRodríguez-Solís, Rafael
dc.contributor.representativeDíaz, Walter
thesis.degree.levelM.S.en_US
thesis.degree.disciplineElectrical Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Electrical and Computer Engineeringen_US
dc.description.graduationYear2006en_US


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