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On antennas for implantable RF medical devices

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Viikari, Ville
dc.contributor.author Miah, Md.
dc.date.accessioned 2014-06-26T09:45:49Z
dc.date.available 2014-06-26T09:45:49Z
dc.date.issued 2014-06-16
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/13590
dc.description.abstract This thesis studied by simulations how the radiation efficiency of two implanted antennas depends on the antenna size and operation frequency. The studied antenna structures are a dipole and a loop made of perfect electric conductor. Antennas are placed inside a tissue model. It is found that at the higher frequency, the radiation efficiency is higher for the same size antenna. In this master’s thesis, a figure-of-merit (FoM) has been derived for implantable antennas. The FoM is proportional to the theoretical channel capacity achievable with the antenna and it is derived under assumptions that the orientation and alignment of the antenna is random and that receiver noise or allowed transmit power does not depend on the frequency. Frequency regulations are not taken into account. Using the FoM, two antenna types are studied by simulation. The studied antenna structures are a dipole and a loop. Further, it also studied what operating frequency maximizes the FoM when the physical size of the antenna is constrained. It is found that optimal operation frequency, which maximizes the FoM is inversely proportional to the antenna size. A small ultra-wideband antenna at 500 MHz is designed for wireless capsule endoscopy. The design process is facilitated with a parametric analysis on the antenna operation inside a lossy tissue. The antenna is a three-layered vertically stacked square spiral PIFA. The proposed antenna exhibits omnidirectional radiation with a maximum far-field gain of -29.67 dB and 0.08% radiation efficiency and -10 dB impedance bandwidth is 300 MHz inside the tissue. en
dc.format.extent 68
dc.language.iso en en
dc.title On antennas for implantable RF medical devices en
dc.type G2 Pro gradu, diplomityö en
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.subject.keyword biocompatibility en
dc.subject.keyword bio-telemetry en
dc.subject.keyword capsule endoscopy en
dc.subject.keyword implantable antennas en
dc.subject.keyword implantable medical devices (IMDs) en
dc.subject.keyword miniaturization en
dc.subject.keyword multilayered square spiral antenna en
dc.subject.keyword optimal operation frequency. en
dc.identifier.urn URN:NBN:fi:aalto-201407012285
dc.programme.major Radio Science and Engineering fi
dc.programme.mcode S3012 fi
dc.type.ontasot Diplomityö fi
dc.type.ontasot Master's thesis en
dc.contributor.supervisor Nikoskinen , Keijo
dc.programme EST - Master’s Programme in Radio Science and Engineering fi
dc.location P1 fi
local.aalto.openaccess no
local.aalto.digifolder Aalto_90923
dc.rights.accesslevel closedAccess
local.aalto.idinssi 49505
dc.type.publication masterThesis
dc.type.okm G2 Pro gradu, diplomityö

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