Diseño e implementación de un sistema de medición de patrones de irradiación de antenas en el rango de frecuencias de hasta 6GHz utilizando tarjetas USRP.

Abstract

The purpose of the current graduation work was to design and implement an antennae irradiation pattern measurement system in the frequency range of 6-Ghz as a top through a universal software radio periphery with software defined radio (SDR). From the analytical and systematic method, it was possible to design two 5-Ghz patch antennas; they work as transmitter and receptors and they interact with USRP cards in the radio-frequency functions. For the communication of the CPUs with USRP cards, it was possible to count with a routable hard disk as well as flash memory with GNU radio and Matlab. Both programs previously set in Ubuntu operating system, in addition there is a servomotor, which will spin the transmitter antennae at 180°, the first computer is used for transmission and the second one for the reception. The reception part is in charge of collecting the irradiation data produced in the moment, these are stored in a .dat file through one of the blocks of GNU radio for the graphic visualization of its irradiation pattern in Matlab. As a result, it was possible to obtain the real graph of the pattern generated by the antennae system (similar or with differences), proving in this way both, theory and performance, it is concluded that the implementation of the system allows having a graphic visualization of antennas irradiation with Matlab software. Most of the times USRP reflect synchronization problems, so that the signal sent must be emitted more than once or it must be permanent facilitating the data collection for its further usage. It is recommended to take into account the GNU radio restart time regarding to transmission and reception, time invested for changing the file order generated by the motor rotation and data collection.