Projeto de antena de microfita flexível utilizando de tecido malha a base de fibras naturais e sintéticas

The flexible microstrip antennas are devices that guarantee the development of communications systems with greater adaptability to the different types of microwaves applications .The possibility of an antenna be designed using textile materials facilitates their conditioning on systems that need is in contact or very close to the human body. The mesh fabric offers greater adaptability to the application due its flexibility. To build the antenna, is necessary check the compatibility between the knitted fabrics available and project needs. Therefore, is essential study the behavior of the electrical and physical features of each structure, analyzing also the influence of synthetic and organic fibers in performance. The characterization allows choice which fabrics is better to manufacture the antenna, is designed and built one microstrip antenna with classic rectangular geometry using the knitted fabric with better performance. The synthetic fibers have better physical characteristics that improve the adaptability of the tissue as a substrate. The electrical characteristics of the mesh fabrics they presented similar behavior as the frequency variation. In the frequency 2.45 GHz knitted fabric composed of polyester and spandex has the best actual values of relative permittivity and loss tangent thus constructed is used in the antenna design. The results show that the resonance frequency is approximately 2.68 GHz, a variation near 230 MHz, this is due to aspects of the test antenna construction