Aplicações de Dispositivos de Microondas utilizandoSubstrato EBG/PBG para Comunicações Móveis

摘要

The modern society depends on an efficient communications system able to oftransmitting and receiving information with a higher speed and reliability every time.The need for ever more efficient devices raises optimization techniques of microstripdevices, such as techniques to increase bandwidth: thicker substrates and substratestructures with EBG (Electromagnetic Band Gap) and PBG (Photonic Band Gap). Thiswork has how aims the study of the application of PBG materials on substrates of planarstructures in microstrip, more precisely in directional quadrature couplers and in rat-raceand impedance of transformers. A study of the planar structures in microstrip andsubstrates EBG is presented. The PBG substrates can be used to optimize the radiationthrough the air, thus reducing the occurrence of surface waves and the resultingdiffraction edge responsible for degradation of radiation pattern. Through specificprograms in FORTRAN Power Station obtained the frequencies and couplings for eachstructure. Are used the program PACMO - Computer Aided Design in Microwave.Results are obtained of the frequency and coupling devices, ranging the frequency bandused (cellular communication and Wimax systems) and the permittivity of the substrate,comparing the results of conventional material and PBG materials in the s and ppolarizations.