Valle Reyes, Jhon Jairo

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    Diseño de un sistema receptor de formación de haz para un arreglo de antenas en fase con capacidad de polarización ajustable para aplicaciones de comunicaciones satelitales más allá de la línea de visión en sistemas de aeronaves no tripuladas
    (2020-04-22) Valle Reyes, Jhon Jairo; Medina Sánchez, Rafael H.; College of Engineering; Colom Ustáriz, José G.; Rodríguez Solís, Rafael A.; Department of Electrical and Computer Engineering; Huérfano Moreno, Víctor A.
    Unmanned aerial systems (UAS) have become an essential tool for monitoring and identifying targets without the need to put human lives at risk on the mission. For the control of the flight path and the collection of UAS information from any location around the Globe, Ku or Ka-band satellite communication links (SATCOM) are used. These bands allow data to be transferred from the aircraft to the ground station, or vice versa. Thus, making use of a satellite transponder. The communication link established from the AUS to the satellite is typically implemented by using an antenna dish and an automatic positioning system that steers the antenna beam toward the satellite. With the appearance of smaller AUSs, which are less bulky and heavier antennas result in the need for more than just satellite dishes; so that the flight performance of the platform is not negatively impacted. An alternative for small UAS is the use of phased array antenna, which is based on electronic scanning antennas. The drawback of this technology is the high cost of the beamformer module, which is made up of hundreds or thousands of microwave transmitter or receiver modules that control the elements of the array. In order to implement a small aperture phase arrangement antenna (12 ”x12”) that is cost-effective for SATCOM systems in the Ku band and that can be used with small AUS, the development of a training network proposed is an antenna beam that is modular, compact and inexpensive. This work describes the design process of a beamforming network for a phased array antenna made up of 28 sub-array that steers the antenna beam in one-dimension. The analysis is included to select the number of sub-arrays that the antenna must have to maximize the G/T ratio. In addition, the design process of the receiver modules of the beamforming network in the Ku band is discussed, designed based on the system requirements. The cascade analysis is performed to predict the electrical behavior of receiver modules and electromagnetic simulations are performed to predict the behavior of passive microwave components. Once the receiver module is designed, it is integrated with the digital control system and the power system in a 2.8”x5” area using PCB technology. Some of the performance predictions obtained from the receiver module are the linear range of 87dBm and the G / T ratio of 4.44 dB / K.