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A Millimeter-Wave Radar Microfabrication Technique and Its Application in Detection of Concealed Objects.

dc.contributor.authorVahidpour, Mehrnooshen_US
dc.date.accessioned2012-06-15T17:30:40Z
dc.date.availableNO_RESTRICTIONen_US
dc.date.available2012-06-15T17:30:40Z
dc.date.issued2012en_US
dc.date.submitteden_US
dc.identifier.urihttps://hdl.handle.net/2027.42/91484
dc.description.abstractMillimeter-wave (MMW) radars are envisioned for a number of safety and security applications such as collision-avoidance, navigation and standoff target detection in all weather conditions. This work focuses on two MMW radar applications: (1) phenomenology of radar backscatter from the human body for the purpose of identification and detection of concealed objects on the body (2) microfabrication of advanced MMW radar to achieve compact and low-cost systems for autonomous navigation. In MMW band, the wavelength (1 mm ~ 1 cm) is long enough to allow signal penetration through cluttered atmosphere and clothing with little attenuation and short enough to allow for fabrication of small-size radar systems. Hence, this frequency band is well suited for the design of small sensors capable of obstacle detection and navigation in heavily cluttered environment and detecting hidden objects carried by individuals. For this purpose, a novel non-imaging approach is developed for distinction of walking human body and concealed carried object using polarimetric backscatter Doppler spectrum. This approach does not need radiometric calibration of the radar and preparation of the subject for radar interrogation. It is shown that a coherent polarimetric radar at W-band (95 GHz) or higher frequencies can be used for standoff detection of concealed carried objects. Motivated by these results, the thesis also includes an investigation on developing a technology for compact MMW radar systems. A micromachined, high-resolution, compact and low-power imaging MMW radar operating at 240 GHz intended for obstacle detection in complex environment is introduced. A frequency scanning antenna array micromachined from three layers of stacked silicon wafers is designed to provide 20 beamwidth in azimuth and 80 in elevation with azimuthal beam scanning range of ± 250. The frequency beam scanning is enabled by a meander rectangular waveguide with a slot array on its broad wall to feed linear microstrip patch antennas microfabricated on a suspended Parylene membrane. This technique offers high fabrication precision; provide easy fabrication and integration with active devices. The performances of the passive components of the radar system are verified using a WR-3 S-parameter and a near-field measurement systems.en_US
dc.language.isoen_USen_US
dc.subjectMMW Radaren_US
dc.subjectRadar Microfabricationen_US
dc.subjectRadar Target Detectionen_US
dc.titleA Millimeter-Wave Radar Microfabrication Technique and Its Application in Detection of Concealed Objects.en_US
dc.typeThesisen_US
dc.description.thesisdegreenamePhDen_US
dc.description.thesisdegreedisciplineElectrical Engineeringen_US
dc.description.thesisdegreegrantorUniversity of Michigan, Horace H. Rackham School of Graduate Studiesen_US
dc.contributor.committeememberSarabandi, Kamalen_US
dc.contributor.committeememberBurns, Mark A.en_US
dc.contributor.committeememberEast, Jack R.en_US
dc.contributor.committeememberGrbic, Anthonyen_US
dc.contributor.committeememberMoghaddam, Mahtaen_US
dc.subject.hlbsecondlevelElectrical Engineeringen_US
dc.subject.hlbtoplevelEngineeringen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/91484/1/mvahid_1.pdf
dc.owningcollnameDissertations and Theses (Ph.D. and Master's)


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