Integração de superfície seletiva em frequência a uma antena planar de banda dupla para aplicação em sensores biomédicos não invasivos
Biomedical sensor technology has developed rapidly with the advancement of wireless communication technology, resulting in a growing field of body-centered wireless networks (BCWNs). There are three types of these systems: in-body (implanted in the body), on-body (non-invasive and positioned above h...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/50726 |
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| Resumo: | Biomedical sensor technology has developed rapidly with the advancement of wireless communication technology, resulting in a growing field of body-centered wireless networks (BCWNs). There are three types of these systems: in-body (implanted in the body), on-body (non-invasive and positioned above human tissue), and off-body (communication between on-body devices and external devices). Off-body communication is important for connecting sensors to external devices and therefore requires antennas that meet specific requirements such as wide bandwidth, good efficiency, and unidirectional radiation pattern. Therefore, this work presents a double square spiral FSS that operates in the 1.91 to 3 GHz and 4.64 to 6.56 GHz bands, covering the entire ISM (2.4 – 2.4835 GHz) and IEEE 802.11 Wireless Local Area Network (WLAN) (5.15–5.725 GHz) bands. The structure was developed to be integrated with a microstrip monopole available in the literature that operates in the bands of interest, in order to improve some of its radiation characteristics such as gain, directivity, and front-to-back ratio (FBR), making the monopole suitable for use in off-body communication in non-invasive biomedical parameter sensing systems in these bands. The FSS was designed using the FR4 dielectric substrate with a thickness of 1 mm, as it was observed that this thickness gives the structure greater angular stability, being therefore stable for incidence angles of up to 30º in both polarizations, vertical and horizontal. All simulated results presented in this work were obtained using the commercial HFSS software version 15.0. The results obtained showed that the antenna integrated with the FSS presents significant improvements in all the parameters that were simulated in relation to it, without the surface. Finally, prototypes of the designed FSS and the microstrip monopole chosen for this work were manufactured and experimental results collected showed good agreement with the simulated results. |
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