Browsing by Author "Cunha, Tiago Alexandre de Oliveira e"
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- Design of textile antennas for cardiopulmonary applicationsPublication . Cunha, Tiago Alexandre de Oliveira e; Mendes, Carlos; Pinho, PedroVital signs monitoring is a crucial medical application to obtain information about the heath status of a subject. The existing methods existing consist on intrusive and rigid devices, such as the Holter monitors, which are less comfortable for the subject. In order to be able to provide a less intrusive and more comfortable experience for the subject, textile antenna are a suitable solution for this case. Furthermore, textile anten nas can be incorporated in clothes, as they use flexible and light materials. Previous works have been made with textile antennas close to a human body, but mostly radiate in the opposite direction of it. This dissertation presents a study on textile antennas and the possibility to detect vital signs. The process of the textile antenna design will be explained, including the de signs picked and tested to obtain the final textile antenna capable to be in a vicinity of human body and capture vital signs. As well as how the antenna was optimized close to a human body and the method used. The final design was a patch antenna with slots with a resonance frequency of 433.93 MHz and with a superstrate to optimize the an tenna performance close to a human body. The antenna was able to obtain vital signs using a method based on the reflection coefficient phase variation as the respiration and heart cycle occurred.