Dispositivos planares integrados utilizando método dinâmico com metamateriais e PBG

This work presents a theoretical, numerical and computation analysis of parameters of a rectangular microstrip antenna with metamaterial substrate, fin line as a coupler and also integrated devices like integrated filter antenna. It is applied theory to full-wave of Transverse Transmission Line - TTL method, to characterize the magnitude of the substrate and obtain the general equations of the electromagnetic fields. About the metamaterial, they are characterized by permittivity and permeability tensor, reaching to the general equations for the electromagnetic fields of the antenna. It is presented a study about main representation of PBG(Photonic Band Gap) material and its applied for a specific configuration. A few parameters are simulated some structures in order to reduce the physical dimensions and increase the bandwidth. The results are presented through graphs. The theoretical and computational analysis of this work have shown accurate and relatively concise. Conclusions are drawn and suggestions for future work

Acoplador e linha de lâmina unilateral e bilateral com substrato fotônico

The aim of this work is to characterize and use the characteristic parameters of the planar structures constructed with fin lines looking for their applications in devices, using PBG Photonic Band Gap photonic materials as substrate, operating in the millimeter and optic wave bands.The PBG theory will be applied for the relative permittivity attainment for the PBG photonic substrate s and p polarizations. The parameters considered in the structures characterization are the complex propagation constant and the characteristic impedance of unilateral and bilateral fin lines that were obtained by the use of the TTL Transverse Transmission Line Method, together with the Method of the Moments. The final part of this work comprises studies related to the behavior of the asymmetric unilateral fin line coupler with photonic substrate. This research opens perspectives for new works in this modern area. Numerical results are shown by means of bi-dimensional and three-dimensional graphics. Conclusions and suggestions for future works are also presented

Aplicações de Dispositivos de Microondas utilizando Substrato EBG/PBG para Comunicações Móveis

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

Imunidade recíproca e livre concorrência: considerações acerca de sua fruição por empresas estatais

This study begins with a brief overview of tax immu nities in general, dealing with the concept, legal, doctrinal ratings and limits. Then enters into the reciprocal immunity, since its birth in the United States, its justifica tions, until her current developments in the Brazilian Supreme Court, which has expanded it quite considerably. That Court has extended to state owned enterprises, even if pa id by public prices or rates, or if acts somewhat away from its essential functions, es pecially if they are public services provider. Given this linkage, these are also treate d in own topic, grounded in newer doctrinal proposals and less attached to historical formalisms (see such Supremacy of Public Interest over Private one). Public services are approached in its diversity, oblivious to traditional monolithic nature and accu stomed to the modern doctrine of fundamental human rights. It deals also the princip les of free enterprise and free competition, given that the public service provider s have lived intensely in this environment, be they public or private agents. In d ialectical topic, these institutes are placed in joint discussion, all in an attempt to in vestigate their interactions and propose criteria less generic and removed from real ity, to assess the legitimacy of the mutual enjoyment of immunity by certain agents. Sev eral cases of the Court are analyzed individually, checking in each one the app lication of the proposed criteria, such logical-deductive activity and theory of pract ice approach. At the end, the conclusions refer to a reciprocal immunity less rhe torical and ideological and more pragmatic and consequentialist. It is proposed the end to the general rules or abstract formulas of subsumption, with concerns on the one h and the actual maintenance of the federal pact, and on the other by a solid econo mic order without inapt advantages to certain players, which flatly contradicts the co nstitutional premises.