Design, fabrication and measurement of hybrid frequency selective surface (FSS) radomes

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buir.advisorErtürk, Vakur B.
dc.contributor.authorSağlam, Özkan
dc.date.accessioned2016-01-08T18:10:22Z
dc.date.available2016-01-08T18:10:22Z
dc.date.issued2009
dc.descriptionAnkara : The Department of Electrical and Electronics Engineering and the Institute of Engineering and Science of Bilkent University, 2009.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2009.en_US
dc.descriptionIncludes bibliographical refences.en_US
dc.description.abstractIn modern military platforms such as ships, aircrafts and missiles, frequency selective surfaces (FSS) are widely used for antennas and radar cross section (RCS) reduction. The RCS of complicated objects such as antennas are difficult or impossible to control over a wide frequency range. The most efficient and cost-effective approach in these situations is to shield the scattering object from the threat radars by making use of wide-band radar absorbing material (RAM) coating. If the object is an antenna, then obviously, the system served by this antenna cannot operate when it is stowed. An alternate approach is to cover the antenna with an FSS that is transparent at the antenna operating frequency, yet opaque at the threat radar frequencies. In this thesis, different types of FSS structures comprising slot elements and modified loop elements, namely single polarized loop FSS, have been investigated intensively with their applications to hybrid FSS radomes. Their resonance mechanisms and transmission properties are examined in detail. The main focus of the thesis is to design a hybrid FSS radome based on different unit element types. Complex dielectric constant measurements are conducted as aninput to the FSS radome design. Experimental results based on measuring the transmission curves of fabricated radome prototypes are supported by computer simulations. Transmission properties of the slot FSS structures and the single polarized loop FSS structures have been compared and discussed. In contrast with most of the published work in literature, transmission measurements are supported by the radiation performance measurements. Adaptation of the single polarized loop FSS radome to the slotted waveguide antenna has been achieved without any significant reduction in the radiation performance. The antenna with this metallic radome has the advantage of superior mechanical durability as well as reduced out-of-band RCS.en_US
dc.description.provenanceMade available in DSpace on 2016-01-08T18:10:22Z (GMT). No. of bitstreams: 1 0003836.pdf: 1372321 bytes, checksum: c4e97a56aa417ddedbe0ddc235082e44 (MD5)en
dc.description.statementofresponsibilitySağlam, Özkanen_US
dc.format.extentxiv, 83 leaves, illustrations, graphicsen_US
dc.identifier.urihttp://hdl.handle.net/11693/14885
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectFrequency Selective Surface (FSS)en_US
dc.subjectdielectric measurementen_US
dc.subjectRCS reductionen_US
dc.subjecthybrid radomeen_US
dc.subjectspace filteren_US
dc.subject.lccTK7872.F5 S34 2009en_US
dc.subject.lcshFrequency selective surfaces.en_US
dc.subject.lcshRadomes.en_US
dc.subject.lcshDielectric measurements.en_US
dc.subject.lcshElectric filters.en_US
dc.titleDesign, fabrication and measurement of hybrid frequency selective surface (FSS) radomesen_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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