Frequency selective surfaces for terahertz applications

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buir.advisorOkyay, Ali Kemal
dc.contributor.authorRamzan, Mehrab
dc.date.accessioned2016-01-08T20:07:56Z
dc.date.available2016-01-08T20:07:56Z
dc.date.issued2015
dc.descriptionAnkara : The Graduate School of Engineering and Science of Bilkent University, 2015.en_US
dc.descriptionThesis (Master) -- Bilkent University, 2015.en_US
dc.descriptionIncludes bibliographical references leaves 46-49.en_US
dc.description.abstractThis thesis presents Terahertz (THz) Frequency selective surfaces (FSS) that can be realized using standard microfabrication techniques. These FSS structures are designed for frequencies around 0.8 THz, which is a crucial operating frequency in security and medical imaging. Using THz waves for such applications, multilayer frequency selective surfaces are preferred due to their wide at band response, lower dependency to angle of incidence, and low loss. The implementation of such structures requires very thin layers of substrates and membranes in order to improve the performance in THz regime. In order to alleviate the di culty in the implementation of multilayer structures, a fabrication process is proposed where a 100 m-thick glass membrane is formed through HF etching of a 500 m-thick glass wafer. Using this fabrication process, three separate designs consisting of single-layer FSS are investigated using high frequency structural simulator (HFSS). The rst design, consists of a circular ring slot in a square metallic structure on top of a 100 m-thick Pyrex glass membrane with 95% transmission bandwidth of approximately 0.042 THz , which remains nearly constant till 30o angle of incidence. The second design consists of a tripole structure on top of a 100 m-thick Pyrex glass membrane with nearly 95% transmission bandwidth of 0.015 THz, which remains nearly constant till 30o angle of incidence. The third structure consists of a triangular ring slot in a square metal on top of a 100 m-thick Pyrex glass membrane with 95% transmission bandwidth of 0.015 THz, which remains nearly constant upto 20o angle of incidence. These designs show that the re ections from samples can be reduced compared to the conventional sample holders used in THz spectroscopy applications; by using single layer FSS structures manufactured through a relatively simple fabrication process.en_US
dc.description.provenanceMade available in DSpace on 2016-01-08T20:07:56Z (GMT). No. of bitstreams: 1 1.pdf: 78510 bytes, checksum: d85492f20c2362aa2bcf4aad49380397 (MD5)en
dc.description.statementofresponsibilityRamzan, Mehraben_US
dc.embargo.release2016-08-18
dc.format.extentix, 49 leaves, chartsen_US
dc.identifier.itemidB151112
dc.identifier.urihttp://hdl.handle.net/11693/17183
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectFSSen_US
dc.subjectBand-pass filtersen_US
dc.subjectBand-stop filtersen_US
dc.subjectLow pass filtersen_US
dc.subjectHigh pass filtersen_US
dc.subjectSpatial filtersen_US
dc.subjectAbsorbersen_US
dc.subjectTerahertzen_US
dc.subject.lccTK7872.F5 R36 2015en_US
dc.subject.lcshFrequency selective surfaces.en_US
dc.subject.lcshElectric filters.en_US
dc.titleFrequency selective surfaces for terahertz applicationsen_US
dc.typeThesisen_US
thesis.degree.disciplineElectrical and Electronic Engineering
thesis.degree.grantorBilkent University
thesis.degree.levelMaster's
thesis.degree.nameMS (Master of Science)

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